REHS Wastewater treatment and Disposal Quiz

REHS Wastewater treatment and Disposal Quiz Questions and Correct CORRECT ANSWER wers Updated Version 2023 A measure of the relatively constant rate at which clear water, maintained at a relatively constant depth, will seep out of a standard size test hole that has been previously saturated is the

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• hydraulic conductivity
• soil permeability test
• soil percolation test
• Baird-Parker saturation test - CORRECT ANSWER c. soil percolation test

A storm sewer is used to

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• remove rain other standing surface water Correct
• remove sewage and storm water Incorrect
• remove household water waste and gutter drain water Incorrect
• remove non-toxic, non-hazardous wastewater Incorrect - CORRECT ANSWER

A water leak no larger than 1/8 inch in diameter can result in a loss of up to:

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• 50 gallons in 24 hours
• 100 gallons in 24 hours
• 200 gallons in 24 hours
• 400 gallons in 24 hours - CORRECT ANSWER d. 400 gallons in 24 hours

A watertight tank designed to slow down the movement of raw sewage and wastes passing through to the soils is known as a

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• pit privy
• spring house
• septic tank 1 / 3

• grease trap - CORRECT ANSWER c. septic tank

After a septic tank has been cleaned, it should not be scrubbed and disinfected. Why?

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• the sludge sticking to the insides would have a seeding effect and assist in renewing

the bacterial activity

• you cannot pay anybody enough money to crawl inside one to clean it
• it would be considered a safety hazard
• a and c above - CORRECT ANSWER d. a and c above

After the absorption field has failed, which of the following will NOT correct or repair the field?

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• reduce the amount of water used in the home
• increase the water pressure
• pump the septic tank
• use low-flow shower heads - CORRECT ANSWER b. increase the water pressure

Bacteria that get their oxygen from the air are called

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• anaerobic bacteria
• aerobic bacteria
• viruses
• fungi - CORRECT ANSWER b. aerobic bacteria

Brine from water softening units as low as ______ may inhibit bacterial action in septic tanks.

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• 1.2 percent
• 5.6 percent
• 8.9 percent
• none of the above - CORRECT ANSWER a. 1.2 percent

By USEPA Standards, the pH of secondary treatment effluent shall be in the range of 2 / 3

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• 5.5 to 7
• 5 to 7
• 7.5 to 10
• 6 to 9 - CORRECT ANSWER d. 6 to 9

Chemical coagulation, flocculation, sedimentation, and filtration remove

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• most bacteria
• most viruses and protozoa
• most helminths
• all of the above - CORRECT ANSWER d. all of the above

Chemical coagulation, flocculation, sedimentation, and filtration will remove nearly all bacteria, viruses, protozoa, and helminths if supplemented by

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• desalination
• chlorination
• over 4 feet of loamy soil
• all of the above - CORRECT ANSWER b. chlorination

Chlorination of untreated wastewater is typically NOT an effective treatment for

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• entamoeba histolytica cysts
• giardia cysts
• tapeworm eggs
• all of the above - CORRECT ANSWER d. all of the above

Common causes of failure of septic tank seepage field systems include improper sizing, nonsuitable soil, nonservicing, and

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