WASTEWATER OPERATOR CERTIFICATION EXAM REVIEW

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WASTEWATER OPERATOR CERTIFICATION EXAM REVIEW

Actual Qs and Ans - Expert-Verified Explanation -Guaranteed passing score -85 Questions and Answers

-Format: Multiple-choice / Flashcard

Question 1: Chlorine contact chamber detention time

Answer:

The minimum detention time for a chlorine contact chamber is 30 minutes.

Question 2: Sludge blanket

Answer:

Layer of solids on the bottom of the clarifier.

Question 3: Tests for determining SVI

Answer:

BOD and TSS

Question 4: UV effectiveness measurement

Answer:

UV intensity is used to determine UV effectiveness.

Question 5: Temperature range for drying TSS samples

Answer:

103-105°C

Question 6: Cause of large amounts of filter flies

Answer:

The presence of large amounts of filter flies could be caused by excessive hydraulic loading.

Question 7: Gas produced by anaerobic decomposition of wastewater

Answer:

Hydrogen sulfide

Question 8: Glucose-glutamic acid volume

Answer:

6.0 mL of glucose-glutamic acid is required when directly adding to a standard 300 mL BOD dilution bottle.

Question 9: Consequence of increased filamentous bacteria growth

Answer:

Bulking sludge and potential effluent solids carryover

Question 10: Increase in influent plant solids

Answer:

If there is a large increase of influent plant solids, you may need to increase the MLVSS in the aeration tank.

Question 11: Step feed reactor

Answer:

In an activated sludge process, a reactor designed to have influent fed at 2 or more points along the length of the reactor is referred to as step feed.

Question 12: Gravity thickeners

Answer:

Gravity thickeners are most similar to clarifiers.

Question 13: Effectiveness of UV treatment

Answer:

TSS is most likely to reduce the effectiveness of UV treatment.

Question 14: Optimal pH range for nitrifying bacteria

Answer:

The pH range for optimal growth of nitrifying bacteria is 7.5 to 8.5.

Question 15: Chemical for phosphorus removal

Answer:

Ferrous sulfate can be used in treating water for phosphorus removal.

Question 16: Suspended solids concentration calculation data

Answer:

520 mg/L

Question 17: Centrifugal pump bearing issue

Answer:

If bearings are excessively hot upon inspection of a centrifugal pump, the likely cause is over lubrication.

Question 18: Reason for preserving solids samples by refrigeration

Answer:

This will slow biological activity and prevent solids decomposition

Question 19: Temperature range for thermophilic digester

Answer:

122-140°F

Question 20: Adjustment of Food to Microorganism (F/M) ratio

Answer:

Adjusting the sludge wasting rate

Question 21: Employee hazards

Answer:

Employee hazards include toxic gasses or vapors, physical injuries, and oxygen deficiency.

Question 22: Influent characteristics with adverse impact on treatment plant

Answer:

Low flow, pH 4, zero DO

Question 23: Reason for collecting flow proportional composite samples

Answer:

The flow and waste characteristics are continually changing

Question 24: BOD sample removal timing

Answer:

A biochemical oxygen demand (BOD) sample can be removed from the incubator at 5 days plus or minus 6 hours.

Question 25: Device not used to measure flow

Answer:

Baffle

Question 26: MCRT

Answer:

How sludge age is determined.

Question 27: Belt filter press sludge streaks

Answer:

If there are streaks of sludge on the belt filter press, the action to perform is to clean the washbox nozzles.

Question 28: Cause of pump vibration

Answer:

There is air in the volute is most likely the cause of heavy vibration in a new horizontal centrifugal pump.

Question 29: Most effective aeration mode for high organic influent loading

Answer:

Step feed