19 Questions
What is the chlorine demand in mg/L?
3 mg/L
Calculate the Sludge Volume Index (SVI) for the mixed liquor sample.
119
What is the rate of grit collection in cu.ft/MG in the given grit channel?
25
What is the ultimate measure of the effectiveness of chlorination in disinfection?
Effective reduction of the coliform count
What does TKN measure?
Ammonia/Ammonium+Organic Nitrogen
How much will sludge with a specific gravity of 1.1 weigh?
9.17lbs/gal
What effect does algae living on carbon dioxide and nutrients in a facultative pond have on pH?
pH increases during the day, and decreases at night
When is the pH of the facultative pond the highest?
During daytime when the consumption of CO2 is the highest
What is the main function of algae in a facultative wastewater treatment pond?
Produce oxygen during daylight hours.
What is the purpose of comminution in wastewater treatment?
Shred large debris and organic material into small particles.
What is the major purpose of an inlet baffle in a settling tank?
Reduce velocity and disperse the flow.
What is the major purpose of primary treatment units in wastewater treatment?
Gravity sedimentation
Which of the following is not a characteristic of hydrogen sulfide?
Lighter than air
What problem can be associated with trickling filters in wastewater treatment?
Ponding
What are the primary organisms responsible for treating wastewater in the trickling filter process?
Aerobic bacteria
What does sloughing from a trickling filter refer to?
The periodic discharge of large quantities of slime growth with the filter effluent.
What is the detention time for a sedimentation tank that is 48 feet wide, 210 feet long, and 9 feet deep with a flow of 5 MGD?
3.25 hours.
What is the weir loading for a sedimentation tank that has an outlet weir 480 ft long and a flow of 5 MGD?
10,420 gpd/ft
How many pounds of solids are pumped to a digester each day if the digester receives 10,000 gpd of sludge at 5% density?
4,170 lbs/day
Test your knowledge of wastewater treatment with this quiz. Questions cover topics such as chlorination effectiveness, TKN measurement, and sludge characteristics.
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