February

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 […]