Free practice · Wastewater Treatment
Grade 2 Wastewater Treatment Practice Questions
Answer each question, then reveal the correct answer and a full explanation. This is independent study material aligned to commonly tested topics, not official exam questions — exact content varies by state and exam vendor.
What is the primary purpose of bar screens in preliminary wastewater treatment?
A tank holds 50,000 gallons and receives a flow of 100,000 gallons per day. What is the detention time?
What is the primary purpose of grit removal in preliminary wastewater treatment?
A primary clarifier has a surface area of 1,000 ft² and receives a flow of 1.0 MGD. What is the surface overflow rate?
Why is dechlorination often required after disinfecting wastewater effluent with chlorine?
A plant receives a flow of 2.0 MGD with a BOD concentration of 220 mg/L. What is the BOD loading in lbs/day?
What is the main difference between primary and secondary treatment in a wastewater plant?
In the activated sludge process, what does a high sludge volume index (SVI) typically indicate?
A 1-liter sample of mixed liquor settles to 250 mL after 30 minutes. The MLSS concentration is 2,500 mg/L. What is the SVI?
What is the primary function of the secondary clarifier following the aeration basin?
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