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Velocity is an important consideration in wastewater collection and treatment systems. What is the desired velocity of flow in gravity sewers and grit channels and why? At municipal wastewater treatment […]

Hydraulic loading in a treatment pond is always given in what units? Organic loading to a treatment pond is always given in what units? Is ft²/s units of flow? There […]

What does “VSR” stand for? If the VSR in an anaerobic digester is found equal to 56%, how does WWTT recommend it be expressed for gas problems? What makes the […]

If VS in anaerobic digesters are not really “reduced” or “destroyed,” what happens to them? What is the primary function of a secondary digester? Why is safety equipment needed in […]

If carbon dioxide is non-flammable, non-explosive, odorless, not toxic, how can it kill you? What is the composition of digester gas? True or false: A DAFT is a dewatering unit […]

What is the difference  between fixed solids and volatile solids? How does the wastewater treatment profession define total suspended solids (TSS)? True or false: Hydrogen sulfide is a major component […]

Describe a typical diurnal flow pattern to a municipal wastewater treatment plant. In the BOD test organic strength is measured indirectly. What is directly measured in this test from which […]

List five analyses that can only be done on grab samples. True or false: A combined sewer conveys domestic and hospital wastes. Explain how infiltration increases after a heavy rain. […]

Total solids (TS) can be divided two ways. What are they and what results from these two divisions? True or false: All settleable solids are total suspended solids. True or […]

Wastewater treatment plants are charged two costs by the local power company. What are they and what are the units of each? How is the density of a liquid calculated […]