Class C Wastewater Treatment Plant Operator Questions

pH is the measure of

The second stage of anaerobic digestion is called

One liter of elemental liquid chlorine can evaporate and produce how many liters of chlorine gas

Chlorine gas is how many times heavier than air?

PLANT PROBLEM: Plant effluent coliform count fails to meet required standards for disinfection. Chlorine residual is normal. Disinfection supplies are not a problem.

The most important adjustments to the activated sludge process are made by adjusting

Problem: Classic sludge bulking occurring in the final clarifier of a conventional activated sludge plant. Indicators include solids pouring over the weirs, excessive floc observed at the surface, and a homogenous sludge blanket appearing throughout the clarifier. Sludge in settling test settles slowly leaving a cloudy supernatant. What is the MOST probable cause?

PROBLEM: Operational data is given below for a primary clarifier: Influent flow: 2.5 mgd Primary tank volume: 41,310 cubic feet

As the operator of a primary clarifier, you notice black and odorous septic wastewater leaving the clarifier. What is the probable cause?

PROBLEM: Plant fecal coliform counts do not meet State standards. The chlorine supply is not the problem, there is adequate vacuum and chlorine feed. The chlorine contact tank has no solids build-up and the effluent flow is below design. That is the MOST likely cause?

A fixed sample is

According to FDEP Chapter 62-602 FAC, an operator could have his/her license permanently revoked for

PROBLEM: Excessive white, billowing foam in the aeration tank surface.

According to Chapter 62-620 FAC, Wastewater Permitting, plant records must be maintained on-site for how many years?

What happens in the stabilization (re-aeration) tank in the contact-stabilization process?

PROBLEM: Good settling in the 30 minute settleability test. Excessive floc billowing in the clarifier and washing out. Sludge scrapers and RAS system appear normal. What is the BEST solution to fix the problem?

PROBLEM: Classic sludge bulking occurring in the final clarifier of a conventional activated sludge plant. Indicators include solids pouring over the weirs, excessive floc observed at the surface, and a homogenous sludge blanket appearing throughout the clarifier. Sludge in settling test settles slowly leaving a cloudy supernatant. What is the necessary check to confirm the cause?

In a well operated activated sludge plant, when the RAS rate is decreased but the WAS rate remains constant, the expected conditions would be

The first step in anaerobic digestion is called

A screenings dumpster is full at the headworks of the treatment plant. The dumpster is 6 ft tall, 10 ft long and 8 ft wide. How many cubic yards of screenings myst be disposed of.

The two main gases formed in the anaerobic digestion process are

In an activated sludge plant, if the DO in the aeration tank suddenly decreases and the aerators are not the problem, what is the most probable cause

How many fusible plugs can be found on a one-ton chlorine container?

A fire has started in the maintenance shop due to an ignition of petroleum oil. Which type of fire extinguisher should not be used to fight the fire?

Mixing dry granular chlorine with petroleum products will

A confined space is defined as having a space large enough to bodily enter and perform work, has limited entry and egress and is _______________ ?

What is the dosage of chlorine, in mg/L, if the flow being treated is 85,000 gpd and 3 pounds of chlorine are used per day?

When properly adjusted, the rope packing on a centrifugal pump is designed to leak how much?

In a lab, a dilute acid solution must be prepared for titration in the alkalinity test. The proper procedure for making the weak acid is to:

What is the removal efficiency of the solids contact/trickling filter process if the influent TSS is 439 mg/L and the plant effluent TSS is 4.0 mg/L?

As an operator of a gravity thickener, you notice floating sludge rising throughout the thickener. All of the following may be a cause for the problem EXCEPT

PROBLEM: Upon arriving at the package treatment plant serving a small community, you find a uniform sludge blanket rising throughout the clarifier. A settlettling sludge leaving a clear supernatant. MLSS test results are normal, but a calculation of the SVI shows a high sludge volume indability test reveals a very slow seex. What is the MOST likely cause of the high sludge blanket ?

PROBLEM: Solids are washing out of the secondary clarifier of the activated sludge plant. Plant personnel increase the return activated sludge (RAS) flow rate, which slows the problem temporarily, but gets worse after 30 minutes. What is the cause of the plant problem?

PROBLEM: Solids are washing out of the secondary clarifier of the activated sludge plant. A settleability test shows good settling CAN occur. The MOST likely cause of the problem is:

PROBLEM: The chlorine residual is falling, and inspection of the 150 lb cylinder and chlorine feed equipment shows ice forming on the chlorine regulator and feed lines. The BEST method to fix the falling chlorine residual is:

The fusible plug on a chlorine cylinder is designed to:

How many times heavier than air is methane gas?

The combination of methane and _____________ can be very combustible?

A class C fire extinguisher is safe to use of what type of fire?

F/M Ratio can be BEST be described as:

According to FDEP chapter 62-601, FAC, a composite sample shall be used for which test?

According to FDEP chapter 62-604.550 (a) FAC, a wastewater spill shall be verbally reported to the state warning point no later than:

According to F DEP chapter 62-600.440 (4)(b), basic disinfection is described as:

According to FDEP chapter 62-600.440 (4)(c) 4, basic level disinfection, any ONE sample may not exceed how many colonies per 100 ml sample?

The preservative used for transport of the fecal coliform sample is: