Quiz
Advanced Wastewater Study Guide
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Fragen in diesem Quiz (200)
1What does it mean when a belt filter press is washing out?
- AWater is overrunning the sides of the belt
- BSludge is squeezing out from between the belt
- CThe unit is being cleaned
- DThe effluent line is clogged
2In the five-stage bardenpho process, what occurs after the microorganisms pass from the first anoxic zone into the first aeration basin?
- AWAS is pumped from the aeration basin back to the head of the plant
- BA percentage of the mixed liquor is returned to the first anoxic zone
- CAll of the mixed liquor passes directly into the second anoxic zone
- DAll of the mixed liquor passes directly into the secondary clarifier
3What kind of problems arise in the clarifier when the sludge is overstabilized?
- ASludge settles too slowly and is hard to keep in the clarifier
- BSludge settles too quickly causing high effluent turbidity due to pin floc
- CSludge settles too slowly and may turn septic in the return sludge system
4First stage BOD is also known by what term?
- ANitrogenous BOD
- BCarbonaceous BOD
- CMetabolic BOD
- DOxidation
5What term is used to describe the liquid that leaves a centrifugal thickener through the effluent line?
- AConcentrate
- BElutriation
- CCentrate
- DPrecipitate
6Why are primary clarifiers not very effective for removing BOD?
- AMost BOD is soluble and cannot be removed by sedimentation
- BMost BOD is insoluble, but not heavy enough to settle
- CPrimary clarifiers cannot handle high organic loads
- DNone of these answers
7When denitrification is occurring, the microorganisms use methanol as a carbon food source. Where do they obtain the oxygen necessary to metabolize the methanol when there is no free oxygen present?
- AThe microorganisms do not need oxygen to metabolize
- BFrom the nitrate ion
- CFrom the ammonia-nitrogen
- DFrom the gaseous nitrogen
8Which modification of the activated sludge process is best suited for nitrification?
- AComplete mix
- BExtended Aeration
- CStep Feed
- DContact Stabilization
9Microorganisms that are in an anaerobic environment are then transferred to a proper environment containing food and oxygen where they take in excess amounts of phosphorus. What is this intake of excess phosphorus called?
- AEndogenous respiration
- BLuxury uptake
- CAnaerobic respiration
- DAbsorption
10What is the term used for water that is contained within the cell mass of sludge?
- ABound water
- BHard water
- CMolecular Water
- DFree Water
11Which of the following has an ammonia odor?
- AMercaptans
- BIndole
- CSkatole
- DHydrogen Sulfide
12What can be said about belt speed in a gravity belt filter thickener?
- AA. As belt speeds increases, the belt area in contact with the influent sludge increases
- BB. As belt speed increases, the belt area in contact with the influent sludge decreases
- CC. Belt speed should be as slow as possible without washing out the belt
- DBoth A and C
13In what order are the basins arranged in the five-stage Bardenpho process?
- AAnaerobic, anoxic, aeration, anoxic, aeration
- BAnoxic, anaerobic, aeration, anoxic, aeration
- CAeration, anoxic, anaerobic, aeration, anoxic
- DAeration, anaerobic, anoxic, aeration, anoxic
14What type of thickener would work best when treating primary sludge?
- ACentrifuge
- BGravity
- CFlotation
- DAll of the above
15Where should screen be located?
- AAs close as possible to where the waste is being produced
- BAs far as possible from where the sludge is being produced
- CAs close to the plant influent as possible
- DAt the aerator influent
16When calculating how much activated sludge is being wasted, what must always be accounted for?
- ASolids lost in effluent
- BSolids in influent
- CDO in Aerator
- DSolids lost in effluent and solids in influent
17What effect would increasing the return sludge aeration time have on the SVI?
- ADecrease
- BIncrease
- CNo change
- DIncrease then decrease
18When chlorine is added to water containing ammonia, the ammonia reacts with the hypochlorous acid and forms:
- ANitrogen gas
- BAlkalinity
- CChloramines
- DNitrates
19If air input to the aerator has not been increased and there is a significant increase in DO residual, what does this indicate and which process control adjustment should be made?
- AIncreased MLVSS/increase wasting and increase RAS
- BToxic shock load/increase wasting and decrease RAS
- CToxic shock load/increase wasting and increase RAS
- DIncreased MLVSS/decrease wasting and decrease RAS
20How deep should sludge be when using a sand drying bed?
- A6-12 inches
- B1-3 inches
- C12-18 inches
- D2-4 feet
21When wastewater has a pH on the low side of 6.5, what property will the wastewater's solid particles have?
- AHigh settleability
- BLow settleability
- CNegative ionic charges
- DPositive ionic charges
22What may be added to wastewater when nutrient levels are too low to support the microorganisms?
- ANitrogen and phosphorus
- BAmmonia and phosphoric acid
- CSodium acetate
- DAll of these
23If the pH of wastewater drops low enough to inhibit nitrification, what has occurred and what should be done to fix the problem?
- AToo much alkalinity / Recarbonate to achieve proper pH
- BNot enough alkalinity / Add lime to achieve proper pH
- CLow DO / Increase air rate
- DHigh DO / Decrease air rate
24At what DO would sulfate be reduced to sulfide?
- A0 mg/L
- B1.0 mg/l
- C2.0 mg/l
- D>2.0 mg/l
25While operating a vacuum filter, the operator finds that the sludge cakes are too wet. What would be the best course of action?
- ADecrease vacuum
- BDecrease chemical conditioning
- CDecrease influent flow
- DDecrease drum speed
26What conditions can cause forming?
- AHigh MCRT values
- BHigh MLSS
- CHigh concentration of filaments
- DAll of these
27The DO should be kept at _______ in the first anaerobic and anoxic zones when using the Bardenpho process?
- A2.0 mg/l
- B1.5 mg/l
- C0.5 mg/l
- D0 mg/l
28When treating high organic loads, what process control adjustment should be made?
- ADecrease RAS
- BIncrease RAS
- CIncrease wasting
- DDecrease DO
29What can cause belt blinding when operating a belt filter press?
- APolymer undressing
- BPolymer overdosing
- CLoose belts
- DBelt speed too high
30Why is the amount of food available to the microorganisms allowed to decrease during aerobic digestion?
- ATo cause denitrification
- BTo cause nitrification
- CTo encourage endogenous respiration
- DTo decrease turbidity
31Why must special care be taken to avoid agitation of the wastewater during the denitrification process?
- ATo avoid allowing free oxygen to enter the wastewater
- BTo maintain aerobic conditions
- CTo avoid disturbing the microorganisms
- DTo decrease turbiditiy
32Organisms that can only use molecular oxygen are called?
- AAnaerobes
- BFacultative
- CObligate aerobes
- DStrict anaerobes
33When is produced during nitrification that may reduce buffering capacity of the alkalinity and cause a subsequent lowering of the pH?
- AHydrogen ions
- BHydroxyl ions
- CCarbon dioxide
- DAcid
34What term describes organisms that use inorganic materials for energy and growth?
- AHeterotrophic
- BEutrophic
- CAutotrophic
- DAnaerobes
35Emergency basins and storage tanks should be kept:
- AFull at all times
- BFilled half way
- CEmpty or almost empty
- DFull during high flows
36What may be indicated by a low respiration rate value?
- ALow F/M ration
- BHigh MLVSS
- CShort MCRT
- DLow F/M Ratio and High MLVSS
37How much chlorine is required to oxidize 1 mg/L of ammonia-nitrogen to nitrogen gas?
- A4 mg/L
- B10 mg/L
- C12 mg/L
- D14 mg/L
38Why does pH increase in most aeration systems?
- AAlkalinity is increased
- BCarbon dioxide is stripped from the wastewater
- CMicroorganism activity increases
- DDO is increased
39What chemical may be used to increase DO when mechanical aeration is insufficient?
- AAmmonia
- BPhosphorus
- CNitrogen
- DHydrogen peroxide
40What kind of problems may arise in the clarifier when sludge is understabilized?
- ASludge settles too slowly and is hard to keep in the clarifier
- BSludge settles too quickly causing high effluent turbidity due to pin flocs
- CSludge settles too slowly and may turn septic in the return sludge system
- DSludge settles too slowly and is hard to keep in the clarifier and Sludge settles too slowly and may turn septic in the return sludge system
41If a drop in pH occurs in an aerobic digester due to nitrification, what process control adjustment can be made to supress the growth of nitrifying bacteria?
- AIncrease air rate and detention time
- BDecrease air rate and detention time
- CDecrease influent flow and increase detention time
- DIncrease influent flow and air rate
42If ammonia-nitrogen levels are too high, what process control adjustments can be made to correct this?
- ADecrease DO
- BDecrease MCRT
- CIncrease DO
- DIncrease WAS
43For every milligram of ammonia - nitrogen converted to nitrate - nitrogen, how much alkalinity is consumed?
- A7.1 mg as CaCO3
- B4.5 mg as CaCO3
- C4.0 mg as CaCO3
- D2.5 mg as CaCO3
44At which temperature would the generation of H2S form?
- A< 40° F
- B65° F
- C75° F
- D> 85° F
45At which pH is all sulfide present only in the gaseous H2S form?
- A> 9
- B8.3
- C7.5
- D4.5
46When sludge becomes too thick it may become resistant to pumping and cause:
- ABound water
- BConing
- CBulking
- DPin Floc
47What chemicals can be used to condition sludge for dewatering?
- AFerric chloride
- BPolymer
- CLime
- DAll of these
48What is a selector?
- AA device used to divert wastewater to various tanks
- BA valve that regulates that flow of influent to the clarifier
- CA computerized system that automatically controls the distribution of influent
- DCompartments within a reactor that each favor the growth of certain organisms over others
49What is the term for the process of removing odors by absorption?
- AStripping
- BScrubbing
- CSponging
- DScouring
50How does thermal sludge conditioning aid in dewatering?
- ABy precipitating the sludge
- BBy release bound water
- CBy destroying microorganisms
- DBy floating the sludge
51Where is the BEST point of application when breakpoint chlorination for nitrogen removal?
- AAfter the filters
- BBetween the secondary clarifiers and filters
- CAt the plant influent
- DIn the aeration basin
52What is one probable cause of low OUR values?
- AHigh F/M ratio
- BLow MCRT
- CToxic shock load
- DYoung sludge
53What is the recommended level of DO for proper nitrification?
- A0.5 mg/L - 1.0 mg/L
- B1.0 mg/L - 1.5 mg/L
- C1.5 mg/L - 2.0 mg/L
- D2.0 mg/L - 4.0 mg/L
54What is the best way to remove limestone buildup in pipes and pumps?
- AAcid
- BHot water
- CCaustic soda
- DAlum
55What is the typical DO range in pure oxygen system?
- A4-10 mg/L
- B1-5 mg/L
- C2-4 mg/L
- D1-10 mg/L
56What is substrate
- AA chemical used by an organism to support its growth
- BThe effluent from a centrifuge
- CA clear liquid left over after sludge is dewatered
- DA type of sludge residual
57In the 5 stage Bardenpho process, what occurs in the first stage?
- AMicroorganisms enter the aeration basin where they take in large amounts of phosphorus
- BMicroorganisms enter the first anoxic zone where they begin denitrification
- CMicroorganisms enter the anaerobic zone where they release their phosphorus
- DMicroorganisms enter the first anoxic zone where they release their phosphorus
58What happens when pressurized air saturated liquid is released at atmospheric pressure during flotation sludge thickening?
- ASludge floats to the surface
- BSludge settles
- CDenitrification
- DNitrification
59Which microorganisms may predominate when nitrogen and phosphorus levels are low?
- AFilamentous
- BCiliates
- CAmoebas
- DRotifers
60Which microorganisms can cause bulking and foaming?
- AFilamentous
- BRotifers
- CCiliates
- DProtozoa
61Polymers that have a positive charge are called?
- ACationic
- BAnionic
- CNonionic
- DPolyionic
62What is the optimal pH when using alum to remove phosphorus?
- A6.0
- B8.0
- C10.0
- D11.0
63The difference in pressure above and below the media of a gravity filter is called?
- AHead loss
- BPressure differential
- CFlow rate
- DConcentration polarization
64What term describes the condition where an oxygen deficient condition exists, but chemically bound oxygen such as nitrate is present?
- AAnaerobic
- BAerobic
- CAnoxic
- DEndogenous
65What is an indication of alum sulfate (Alum) overdosing?
- ALow pH
- BCloudiness caused by high turbidity and suspended solids
- CHigh pH accompanied by pin floc
- DLow pH and cloudiness caused by high turbidity and suspended solids
66Approximately how many pounds of oxygen are required to nitrify one pound of ammonia-nitrogen?
- A2.5 lbs
- B3.7 lbs
- C4.6 lbs
- D5.0 lbs
67What is the proper term for the substance that may form in digested sludge lines and on the rotating components of centrifuges?
- ACentrate
- BConcentrate
- CStruvite
- DPrecipitate
68How deep should the sludge blanket be in gravity thickener?
- A1-3 ft
- B2-5 ft
- C3-4 ft
- D5-8 ft
69Which microorganisms prefer lower pH levels around 6.0?
- APhosphorus removal microorganisms
- BVolatile fatty acid removal microorganisms
- CNitrifiers
- DPhosphorus removal microorganisms and nitrifiers
70What is the lowest concentration of hydrogen sulfide that can be detected by the human nose?
- A1.0 ppb
- B0.5 ppb
- C1.5 ppb
- D2.0 ppb
71High respiration rate values may indication?
- AUnderstabilzed organic matter
- BOverstabilzed organic matter
- CLow MLVSS
- DLow F/M ration
72Which of the following is biodegradable and easily treated?
- AEmulsified oils & greases of vegetables and animal origin
- BOils & greases of mineral origin
- CHeavy metals
- DH2S
73Which of the following may be caused by excessive wasting?
- AHigh MLVSS
- BHigh MCRT
- CLow F/M ratio
- DHigh F/M ratio
74Where is the best place to add chlorine when using it to control odors?
- AIn the collection system ahead of the plant
- BIn the primary clarifier
- CIn the aerator
- DIn the plant effluent
75What process control adjustment should be made when there are a large number of amoeboids and flagellates present?
- AIncrease wasting
- BDecrease wasting
- CIncrease MCRT
- DDecrease DO
76Organisms that can only use bound sources of oxygen are known by what term?
- AObligate aerobes
- BFacultative
- CAnaerobic
77Wasting is done from the RAS and the volatile content in the aerator changes. If the volatile content of the RAS is increasing, what adjustment should be made to the WAS flow rate?
- ANo change
- BIncrease
- CDecrease
- DStop all wasting
78What is the order in which microorganisms break down compounds containing oxygen?
- ACarbon dioxide, molecular oxygen, nitrate, sulfate, oxidized organics
- BMolecular oxygen, oxidized organics, carbon dioxide, nitrate, sulfate
- CMolecular oxygen, nitrate, sulfate, oxidized organics, carbon dioxide
- DNitrate, molecular oxygen, sulfate, oxidized organics, carbon dioxide
79Wasting is done from the RAS, and the volatile content in the aerator remains constant. If the volatile content of the RAS is decreasing, what should be done to the WAS flow rate?
- ANo change
- BIncrease
- CDecrease
- DStop all wasting
80Which is an organic gas that has an offensive skunk-like odor?
- AMercaptans
- BIndole
- CSkatole
- DH2S
81When is the best time to measure the sludge blanket depth in a clarifier?
- ADuring minimal flows
- BDuring maximum flows
- CAt night when it's cool
- DAny time
82What is the minimum DO that must be present in order for obligate aerobes to function properly?
- A0.5 mg/L
- B1.0 mg/L
- C1.5 mg/L
- D2.0 mg/L
83When using a belt filter press to dewater sludge, water is forced between the belts and:
- APumped to the effluent line
- BPumped with the RAS
- CCollected in filtrate trays
- DAllowed to evaporate
84What are some of the properties of alum?
- AIt reduces alkalinity and supports bacterial growth
- BIt is very acidic
- CIt increases alkalinity and pH
- DIt reduces alkalinity and supports bacterial growth and it is very acidic
85If the nitrate level in the effluent of the first anoxic basin during the 4 stage Bardenpho process is too high, what process control adjustment should be made?
- AIncrease influent flow rate
- BIncrease recycle rate
- CIncrease air rate
- DDecrease recycle rate
86What type of microorganism accomplishes denitrification by converting nitrate to nitrogen gas?
- AAutotrophic
- BHeterotropic
- CEutropic
- DThermotropic
87Why do pH levels drop during nitrification
- AAcid formers predominate
- BNitrate is acidic in nature
- CAlkalinity is destroyed
- DHigh sludge age
88Why must pH of water be raised to between 10.8 and 11.5 during ammonia stripping?
- ATo reduce microorganism population
- BSo that all of the ammonia ion is converted to ammonia gas
- CTo strengthen the buffering capacity
- DFor odor control
89When using odor removal towers to control odors, the pH of the wastewater being treated should not drop below:
- A10.0
- B8.0
- C7.0
- D6.0
90What is the desired water column pressure in pure oxygen system?
- A4"-6"
- B2"-8"
- C3"-10"
- D1"-4"
91What may be indicated by a high residual DO and low oxygen uptake rate in an anaerobic digester?
- AToxic substances are present
- BLow pH
- CLow detention times
- DToxic substances are present, Low pH, and Low detention times
92How can lime be recovered for reuse?
- AGravity belt press
- BFlocculation
- CCentrifuges
- DFloatation
93What are nitrosomonas and nitrobacter?
- AHeterotophs that metabolize organic substances such as nitrate
- BMicroorganisms that predominate in young sludge
- CAutotrophs that metabolize inorganic substances such as carbon dioxide and bicarbonate alkalinty
- DTwo forms of nitrogen
94What may be indicated by a high chlorine demand in the plant effluent when the plant requires nitrification?
- AElevated nitrate levels
- BAn imbalance of nitrobacter and nitrosomonas polulations
- CHigh pH levels
- DElevated nitrate levels and an imbalance of nitrobacter and nitrosomonas polulations
95When using the MCRT to determine process control adjustments, how long should you wait before making further changes if the desired MCRT is seven days?
- A3 days
- B10 days
- C2 to 3 weeks
- D4 to 6 weeks
96What should an operator do when a high organic waste load enters the plant?
- ADecrease RAS flows and air input
- BDecrease WAS flow and air input
- CIncrease RAS flow and air input
- DIncrease WAS flow and air input
97At what pH will carbon dioxide be stripped from water?
- A8.0
- B9.0
- C10.0
- D11.0
98What is the recommended ratio of BOD: Nitrogen:Phosphorus (B:N:P) required for a treatment process?
- A100:5:1
- B100:50:10
- C10:5:1
- D100:20:10
99What process control adjustments should be made when greater nitrification is required?
- AIncrease MCRT
- BDecrease sludge age
- CDecrease pH
- DDecrease MCRT
100When removing odors using the electrolytic process, electrons convert the salt in the brine to:
- AChlorine
- BCalcium carbonate
- CSodium hypochlorite
- DCalcium hypochlorite
101How deep should the sludge blanket be in the clarifier when using the activated sludge process?
- A0.5 - 1 ft
- B3 - 5 ft
- C1 -3 ft
- D> 5 ft
102Which modification of the activated sludge process uses two aeration tanks in which one of the tanks is used for seperate reaeration of the return sludge?
- AExtended aeration
- BStep feed aeration
- CContact stabilization
- DPure oxygen aeration
103The use of metal salts for optimum enhanced chemical phosphorus removal is highly dependent on pH. Therefore, where is the optimum point for application of metal salts?
- AAfter denitrification when alkalinity levels are highest
- BBefore denitrification because of the gain in alkalinity that occurs during anoxic reduction of nitrate-nitrogen
- CAfter nitrification because of the alkalinity depletion during the nitrification process
- DBefore denitrification because of the gain in alkalinity that occurs during anoxic reduction of nitrate-nitrogen and after nitrification because of the alkalinity depletion during the nitrification process
104For every pound of organic matter used by bacteria cells, approximately how many pounds of new bacteria cells are produced?
- A2.5 lbs
- B1.5 lbs
- C0.5 lbs
- D> 2.5 lbs
105What is a common problem associated with ammonia stripping?
- AScale buildup on pipes and pumps
- BStrong odors
- CIncreased pH
- DMicroorganisms are destroyed
106What condition must exist for proper nitrification?
- ALow BOD
- BAvailable oxygen
- CA detention time of at least 4 hours
- DLow BOD, Available oxygen, and A detention time of at least 4 hours
107What percent of oxygen is present in air?
- A20.9%
- B22%
- C23.5%
- D19.6%
108Odors can be controlled by ________ the pH
- ARaising then lowering
- BLowering
- CLowering then raising
- DRaising
109What process control adjustment can be made to minimize denitrification in a clarifier?
- ADecrease RAS
- BDecrease WAS
- CIncrease RAS
- DIncrease DO
110Why is the COD test not recommended for wastewater's containing high salt concentrations?
- AAlgae may interfere with the test
- BBrine contains high organic levels
- CChloride may interfere with the chemical reactions
- DSalt has no effect on COD tests
111If cake solids that are produced by a gravity belt thickener are too wet, what adjustments should be made?
- ADecrease belt speed and or increase belt tension
- BIncrease belt speed and or decrease belt tension
- CIncrease belt speed and or increase belt tension
- DDecrease belt speed and or decrease belt tension
112For every pound of ammonia-nitrogen that is oxidized during nitrification, how many pounds of alkalinity are destroyed?
- A4.6 lbs
- B7.2 lbs
- C8.3 lbs
- D10.0 lbs
113Why must sludge be removed from a gravity thickener at a faster rate during warmer temperatures?
- ATo prevent denitrification
- BTo prevent sludge from rising
- CTo prevent incomplete nitrification
- DTo prevent denitrification and to prevent sludge from rising
114Which of the following is the easiest to dewater?
- APrimary sludge
- BSecondary sludge
- CDigester sludge
- DWaste activated sludge
115After microorganisms take in and store large amounts of phosphorus they are transferred to an anaerobic environment. What effect does this have on microorganisms?
- AThey settle to the bottom of the tank and are removed
- BThey release their stored phosphorus
- CThey immediately die and are wasted
- DThey continue to absorb phosphorus
116The first 75% of phosphorus precipitation occurs before the pH drops below?
- A10.0
- B8.0
- C7.0
- D6.0
117What term is used to describe the clogging of the filter medium in a microscreen or vacuum filter?
- APolarization
- BBlinding
- CPlugging
- DBreakthrough
118What instrument is used to measure the amount of water draining through soil?
- ARotameter
- BVenturi
- CLysimeter
- DWinkler probe
119What is the methanol to nitrogen ratio that should be maintained when denitrification is required?
- A1:2
- B2:1
- C3:1
- D5:1
120If an anaerobic selector is being used to achieve phosphorus removal and the the next priority is denitrification, what would be the next selector necessary to achieve this?
- AAerobic
- BAnoxic
- CSame selector (Anaerobic)
- DAny of the above
121For optimal phosphorus removal, pH should not drop below?
- A4.0
- B6.0
- C8.0
- D11.0
122What condition must exist for ammonium to be converted to gaseous ammonia so it can be removed by ammonia stripping?
- ApH must be raised to the 10.5-11.5 range
- BpH must be lowered to 6.0
- CDO must be increased
- DNitrobacter must be present
123What is the term used to describe the boundary layer between two substances?
- AConcentrate
- BInterface
- CSubstrate
- DConing
124What adverse effect can high levels of ammonia have on receiving waters?
- AOxygen depletion
- BIncrease DO
- CAlgal blooms
- DOxygen depletion and algal blooms
125Which is an example of suspended growth denitrifaction?
- ARotating biological contractor
- BTrickling filter
- CExtended aeration
- DNone of the above
126When operating an Advanced Treatment facility using chemical treatment for solids removal, you discover high flows entering the system. You should?
- AInspect the chemical feeders to determine if the chemicals being added do NOT cause a great increase/decrease in pH
- BPlan on reducing the sludge removal system from the clarifier
- CPrepare to feed a greater quantity of chemicals
- DWatch for chemical overdoses that could produce toxic conditions in the biological
127When using polymer in a gravity thickening process for sludge, when would more polymer dosages be required? When the:
- AHydraulic loading rate increases
- BHydraulic loading to the unit decreases
- CSludge selector speed is decreased
- DSolids loading to the unit decreases
128When bacteria laden with phosphorous are faced with apparent death, they:
- AAbsorb phosphorous from wastewater in large quantities
- BAbsorb phosphorous from wastewater slowly
- CBegin to reproduce to save the species
- DRelease phosphorous from their cell structure in large quantities
129Head loss in a gravity filter is determined by?
- AEff. turbidity minus Inf. Turbidity
- BFlow minus the weir overflow rate
- CInf. Turbidity minus Eff. Turbidity
- DMeasuring the water pressure above and below the filter media
130What dosage of chlorine can be fatal in just a few breaths?
- A50 ppm
- B100 ppm
- C250 ppm
- D1000 ppm
131What statement best describes at which speed a belt filter press should be operated?
- AThe area of the belt determines the speed
- BThe ideal belt speed is the slowest the operator can maintain without washing out the belt
- CThe concentration of the sludge eff. determines the speed
- DThe material of which the belt is made determines the speed
132What steps should the operator take if "washing out" occurs while operating a belt filter press?
- ADecrease tension on belt
- BDecrease wash water rate
- CIncrease sludge rate and belt speed
- DLower flow rate and increase belt speed
133A problem with plastic pipe laterals resting on the surface in a spray irrigation system is?
- AThe pipe can deteriorate due to exposure to sunlight
- BSnakes and other lethal animals can lurk under the pipe
- CThe pipe will whip violently during system operation
- DDistribution of the effluent will not be as effective
134FDEP approved continuous on-line analyzing of reclaimed water effluent includes analyzing for:
- ACBOD5
- BpH, chlorine, and turbidity
- CD.O. and temperature
- DFecal Coliform and Total Coliform
135Lime is used more frequently for phosphorous removal than Aluminum Sulfate because Aluminum Sulfate:
- ADoes not settle as rapidly in clarifiers
- BIs more expensive than lime
- CRaises the pH too much
- DRequires anaerobic conditions and lime does not
136What process control adjustment should be made when a 30 minute settleometer test shows fast solids settling leaving pin-point floc? Increase the:
- AAeration rate
- BMLSS
- CRAS rate
- DWAS rate
137According to Chapter 62-600, FAC, Domestic Wastewater facilities, the basic disinfection requirement (using chlorine) is a :
- A0.5 mg/L total chlorine residual after 15 minutes contact time at average daily flow
- B0.5 mg/L minimum total chlorine after 15 minutes contact time at peak hourly flow
- C0.5 mg/L minimum total chlorine residual after 30 minutes contact time at maximum daily flow
- D1.0 mg/L total chlorine residual after 15 minutes contact time at maximum daily flow
138In an aerobic digester, excessive air rates can contribute to?
- AAn increase in the activity of biomass
- BFoaming problems
- CHigh solids carry over
- DReduction of the activity of biomass
139A common operational problem that can occur with ammonia stripping towers involves:
- AAsphyxiation if personnel remain in the tower too long
- BCorrosion due to the chemical reaction forming acids
- CReduction of capacity due to media breakdown
- DScale formation due to calcium carbonate build-up
140What causes a loss of vacuum in a vacuum filter?
- AChange in effluent characteristics
- BDrum speed too low
- CFilter media misalignment or tear
- DInsufficient conditioning
141According to Chapter 62-620, FAC, Wastewater Facility Permitting, the permittee shall retain treatment facility operating records for how many calendar years?
- A2 years
- B3 years
- C10 years
- D15 years
142In lakes and deeper rivers, cold waters tend to slip below warmer waters because?
- AWarmer waters always rise to the top due to atmospheric pressure
- BThermo clines force them to
- CCold water is heavier or has a greater density
- DCaused by wind action at the surface
143According to Chapter 62-602, FAC, Drinking water and Domestic wastewater treatment plant operators. The operator must report to the department any serious plant breakdown or condition causing or likely to cause any discharge not in compliance with the treatment plant permit within how many hours of the occurrence?
- A6 hours
- B12 hours
- C24 hours
- D48 hours
144The plant EFF coliform count has failed to meet the required standards for disinfection. The supply of disinfectant is not the problem. There is adequate chlorine residual. To confirm the cause, it is most relevant to check the:
- AChlorine in the stream mixing zone
- BChlorine Contact Chamber for short circuiting
- CChlorine Contact Chamber for solids scouring
- DTotal chlorine residual analysis
145How is the Fecal Coliform parameter evaluated?
- AThe concentration is estimated by using the (MLN) Likely number method
- BThe concentration is estimated by the TBEL method
- CThe concentration is estimated by using the most probable number (MPN) method or the membrane filter (MF) method
- DThe value is determined by microscopic examination
146When reading the level of a column of liquid in a graduated cylinder, burette or manometer, you should?
- AFill the glassware to 10 centimeters below the lip of the glassware and record
- BHold a solid color sheet of paper behind the glassware and record the level to the nearest 10 millimeters
- CRecord the level of the bottom of the meniscus of the liquid being measured
- DView the liquid level from an elevation equal to the liquid level and read the top of two liquid level lines
147According to Chapter 62-601, FAC, Domestic W/W treatment plant monitoring, after July 1, 1993, the tests for on-site parameters pH and chlorine residual shall be performed by or under the direction of ?
- AA certified laboratory or a certified operator
- BPlant laborers
- CPlant Technicians
- DThe permittee
148What should be the pH in a rapid-mix basin for a maximum phosphorous removal efficiency when using lime?
- A5.0
- B6.0
- C8.3
- D11.0
149Secondary clarifiers are showing straggler floc lost over weirs. Microscopic exam shows few free swimmers, majority of flagellates. SVI is increasing. What visual observation and test results would you expect?
- ADark foam, increasing F/M and SRT, decreasing turbidity
- BLight brown foam, decreasing F/M and SRT, decreasing turbidity
- CLight brown to white foam, increasing F/M, dalling SRT and increasing turbidity
- DWhite foam, decreasing F/M, falling SRT, increased turbidity
150The plant EFF coliform count has failed to meet the required standards for disinfection. The supply of disinfectant is not the problem. There is adequate chlorine residual. The best solution is to?
- AChlorinate to breakpoint
- BDecrease the flow to the steam mixing zone
- CIncrease the chlorinator capacity
- DInstall additional baffling
151Which statement is correct concerning confined spaces?
- AConfined spaces are defined as those that concurrently provide difficult access and/or exit combined with inadequate or deficient ventilation.
- BMonitoring the atmosphere within a confined space is required each hour and is logged into the confined space log book
- CYou may enter a confined space only when oxygen levels are above 20%
- DYou may process in a confined space only if air contamination exists
152If a sand drying bed has a problem with the media becoming clogged, what should the operator do first?
- AHave the contractor replace all the media but leave the gravel intact
- BInvestigate the type of sand being used and recommend a different type
- CRake the surface of the bed, removing the upper 2 to 3 inches of sand, and replace the sand with fresh sand
- DRemove the sand, wash it, check the under-drain, then replace the sand
153What should be the pH in a rapid-mix basin for maximum phosphorous removal efficiency when using lime?
- A5.0
- B6.0
- C8.3
- D11.0
154What is the most common method of EFF disposal?
- AEvaporation/Percolation ponds1
- BIn deep wells
- CIn receiving waters
- DLand disposal
155What would be the usual approach to measure the impact of a discharge to receiving waters?
- AAnalyze the plants performance evaluations
- BCompare the in-plant measurements measurements to down stream receiving waters
- CReview the Grab sample measurements
- DTake a measurement in the upstream, unaffected area, and compare to a down stream affected area
156What does not represent a potential hazard of working in a wastewater treatment laboratory?
- ABurns
- BElectrical shock
- CHypothermia
- DInfectious materials
157An instrument used in a laboratory that measures the intensity of color or particular wavelength is a ?
- AColor standard
- BNephelometer
- CSpectrophotometer
- DTurbidimeter
158A gravity filter experiences rapid build-up of head loss. What could be a probable cause?
- AApplied water flow rate too low
- BIncomplete backwash cycle
- CMedia breakthrough
- DTurbidimeter
159What problems may develop during the injection of reclaimed wastewater into deep wells?
- AContamination of groundwater
- BLowering of groundwater table
- CSaltwater intrusion
- DSevere hydraulic overload
160According to state regulations, a wastewater plant shall maintain a pH in the effluent after disinfection within what range?
- A2.5 - 4.5
- B4.5 - 6.0
- C6.0 - 8.5
- D8.5 - 10.5
161In chapter 62-699, FAC, Treatment Plant Classification and Staffing, wastewater treatment plants are classified in order to prescribe the lowest class of certified operators who will be permitted to operate the treatment plant. This classification system is based on what (2) factors?
- ADesign flow and treatment type
- BFlow and treatment efficiency
- CPopulation and flow
- DPopulation served and treatment type
162Two inorganic gases giving off the most offensive odors and which is a main concern of operators when controlling odors are?
- AAmmonia and skatole
- BHydrogen sulfide and ammonia
- CMercaptans and indole
- DMethane and ammonia
163The recovery of a stuck anaerobic digester can be accelerated be neutralizing the acids with a caustic material like?
- AAluminum sulfate
- BCalcium hypochlorite
- CLime
- DSodium hypochlorite
164When operating an advanced treatment facility using chemical treatment for solids removal, you discover high flows entering the system. The first step you should take is to?
- AInspect the chemical feeder for proper output
- BPrepare jar tests to determine dosage that will be good for increased detention
- CPrepare jar tests to determine dosage that will be good for decreased detention time
- DRun influent turbidity tests hourly to see if the turbidity is actually increasing
165Even though a process control test is accurately performed, which one of the following could result in meaningless findings?
- AThe ambient temperature being several degrees cooler than normal
- BThe analyst not being certified
- CThe sample not being representative of the process stream being sampled
- DThe use of class A glassware instead class B glassware
166It takes about 22% less O2 to process 1 lb of carbonaceous waste than 1 lb of nitrogenous waste. What does this indicate?
- AAdditional DO is required to nitrify
- BCarbonaceous material should be add to the MLVSS
- CCarbonaceous wastes take longer to digest
- DNitrogenous wastes are easily oxidized
167To determine the location and amount of lowest dissolved oxygen downstream from a wastewater effluent discharge, it is necessary to?
- AConduct an annual measurment survey
- BConduct an oxygen profile of the stream
- CConduct an oxygen profile of the treatment plant
- DObserve the aquatic life
168A sand and gravel filter had been working well, but eventually head loss occurred. Performance did not improve significantly following backwashing. What is the most probable cause?
- AThe backwash water overloaded the system
- BThe backwash time was too short
- CThe backwash time was too long
- DThere was excessive auxiliary scour
169The floating cover on a primary anaerobic digester appears to be tilting. Inspection of the rollers indicates that they are not the problem. Probing the annular space results in finding a thick scum accumulation. What should be done at this point?
- AAttach a crane cable to one side and lift the corner
- BDecrease the mixing so the scum will be broken up
- CUse chemicals or degreasing agents, then hose down the scum bucket through the inspection ports
- DImmediately drain the tank before an explosion takes place
170Nitrification in the activated sludge process?
- ADecreases alkalinity and increases pH
- BDecreases alkalinity and pH
- CIncreases alkalinity and pH
- DIncreases alkalinity and decreases pH
171Which statement is most correct concerning dissolved oxygen content in water?
- AAn increase in water temperature causes an increase in DO
- BDecreases in dissolved oxygen content in receiving water is immediately noticed
- CAn increase in temperature causes a decrease in dissolved oxygen concentration
- DTemperature has no effect on dissolved oxygen concentrations
172Rapid accumulation on the surface of a single media sand filter results in very rapid head loss. The solution is ?
- AImprove prior clarification
- BIncrease chemical coagulation
- CReduce filter backwash time
- DReduce the filter air scrubbing time
173In the microscopic exam of the mixed liquor, you observe a dominance of rotifers and nematodes. What would this be indicative of?
- ABulking sludge that settles slowly leaving straggler floc
- BOld sludge that settles rapidly, leaving pin floc
- CRising sludge that settles rapidly, leaving fluffy floc
- DYoung sludge that settles slowly, leaving pin floc
174When using break-point chlorination for ammonia removal, how many ppm of chlorine are needed to remove 1 ppm of ammonia?
- A1
- B5
- C8
- D10
175Misalignment of a driver and a driven piece of equipment can cause?
- APremature bearing failure
- BExcessive wear of the slip rings
- CThe packing to leak
- DValve chatter
176Effluent quality has changed from excellent to poor. A microbial study indicates a decrease of stalked ciliates and rotifers. Now, the predominance is free swimming and flagellates. This observation indicates that the ?
- AMCRT is decreasing
- BMCRT is increasing
- CProcess is moving toward a more stable condition
- DTreatment efficiency is increasing
177In a suspended growth reactor used for Denitrification
- AA carbon food source is needed for proper metabolism of the organisms
- BA dissolved oxygen level of at least 2.0 mg/L should be maintained in the aeration tank at all times
- CNitrate is first converted to ammonium, then to nitrite
- DNitrite is first converted to nitrate then ammonium
178The strategy of allowing chlorinated water to stand for 24 to 48 hrs in the rapid sand filter and thoroughly backwashing media is a remedy for?
- ACuring breakthroughs
- BRemove dissolved air which causes air binding
- CRemoving grease and oil from the filter wells
- DRemoving mud balls
179When a 5 min observation of the settlability test indicates fast settling (e.g., 500 ml), what process change should be made?
- ADecrease the RAS
- BIncrease the aeration and RAS
- CIncrease the aeration
- DIncrease the wasting rate
180For ammonia stripping to be successful:
- ANitrosmonas and Nitrobacters must be present
- BChemicals must be added to convert nitrogen to nitrate
- CThe pH must be raised to approximately 10.8 to 11.5
- DThe wastewater to be treated must be stripped of its dissolved oxygen content first
181Water quality criteria for wastewater reclaimed for public access includes:
- AComplete lack of BOD
- BHigh level disinfection
- CNo dissolved inorganic solids
- D50 mg/L TSS
182What is the optimum temperature range for the nitrification process?
- A70 ° and 100 ° F
- B60 ° and 90 ° F
- C65 ° and 85 ° F
- D10 ° and 20 ° F
183CO2 is stripped at pH below ___ and retained at a pH above ___
- A7.0 and 10
- B6.0 and 11
- C8.3 and 9.5
- D8.3 and 8.3
184How much lime is required per ton of primary sludge?
- A100-200 lbs / ton
- B80-90 lbs / ton
- C150-175 lbs / ton
- D175-250 lbs / ton
185What happens to phosphorus in a plant effluent when mixed with lime?
- APhosphorus, calcium and hydroxyl ion compounds are formed
- BPhosphorus carbonate precipitate is formed
- CPhosphorus will cause a reaction that lowers the pH
- DPhosphorus will form a soluble sludge
186What is utilized as a carbon source?
- ANitrogen
- BPhosphorus
- CMethanol
- DAerobic bacteria
187In a centrifuge series, centrate from the ____ centrifuge contains most of the phosphorus?
- AFirst
- BSecond
- CThird
- DLast
188Using ION exchange for nitrogen removal; what is the name of the resin used?
- AClinoptilolite
- BZemalite
- CMiller lite
- DRed line resin
189Supplemental phosphorus can be provided by using what items?
- APhosphoric acid
- BAmmonia
- CPhosphate fertilizer
- DPhosphoric acid and Phosphate fertilizer
190Filters should be back washed at what type of flow?
- ASlow so the filter material stays put
- BFast just keeping the filter media in the bay
- CAdequate to fluidize the media
- DFast just letting a small amount of media material to be washed away
191What types of carbon food sources may be used in denitrification fixed film reactor to promote biological metabolism?
- AHydrogen sulfide, primary effluent, source of high carbon food
- BNitrate, primary effluent, source of high carbon food
- CMagnesium, primary effluent, source of high carbon food
- DMethanol, primary effluent, source of high carbon food
192What may be used as a phosphorous supplement?
- ADissolved triple superphosphate, phosphate fertilizer, phosphoric acid
- BAqueous ammonia, anhydrous ammonia
- CSeed sludge
- DCationic Polymers
193What may be used as a nitrogen supplement?
- ADissolved triple superphosphate, phosphate fertilizer, phosphoric acid
- BAqueous ammonia, anhydrous ammonia
- CSeed sludge
- DCationic Polymers
194Methanol is?
- AAn alcohol compound which can be ingested in small amounts without harm
- BA common component of many alcoholic beverages
- CComposed of hydrogen, oxygen, carbon and nitrogen - CH3OH
- DA fuel additive and it is highly flammable
195What do autotrophic nitrifiers use as a carbon source?
- ABicarbonate alkalinity
- BLime
- CAlgae
- DNitrobacter bacteria
196When denitrification is occurring, the microorganisms use methanol as a carbon food source. Where do they obtain the oxygen necessary to metabolize the methanol when there is no free oxygen present?
- AThe microorganisms do not need oxygen to metabolize methanol
- BFrom the nitrate ion
- CFrom the ammonia-nitrogen
- DFrom the gaseous nitrogen
197What may be added to wastewater when the nutrient levels are too low to support the microorganism population?
- ANitrogen and phosphorus
- BAmmonia and phosphoric acid
- CSodium acetate
- DAll of the above
198When treating high organic loads, what process control adjustments should be made?
- ADecrease RAS
- BIncrease RAS
- CIncrease wasting
- DDecrease DO
199The DO should be kept at ____ in the first anaerobic and anoxic zones when using the Bardenpho process?
- A2.0 mg/l
- B1.5 mg/l
- C0.5 mg/l
- D0 mg/l
200Why is the amount of food available to the microorganisms allowed to decrease during aerobic digestion?
- ATo cause denitrification
- BTo cause nitrification
- CTo encourage endogenous respiration
- DTo decrease turbidity
Informationen
- Beschreibung
- Wastewater Public Utilities Quiz am Advanced Wastewater Study Guide, erstellt von Dean Lampman am 01/03/2019.
- Autor
- Dean Lampman
- Sprache
- English
- Aufrufe
- 890
- Schlagwörter
- Bewertung
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