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20 Cards in this Set
- Front
- Back
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The wastewater from the flushing of a water closet, latrine or privy is referred to as
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Black water
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If a septic tank is pumped during a wet period the
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Tank may float out of the ground
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Nutrients associated with eutrophication include all of the following except
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Potassium
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What is least important when reducing sewage to gases
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Earthworms
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A septic tank maintenance worker has checked an empty tank for the presence of hydrogen sulfide. The test was negative and there are no odors indicating the presence of other hazardous gases. Is the tank safe to enter without a respirator and supplied air
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No because oxygen content and methane were not tested
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All of the following are true about ozone as a disinfectant except
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Long-lasting residual
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Aerobic bacteria require all of the following nutrients except
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Magnesium
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What does a mottled brown and red soil indicate
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Inadequate areation methods
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Alternative small waste water treatment systems are considered unless
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impervious formations are found at a depth of 10 ft
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Lime coagulation, mixed media filtration and activated carbon filtration will greatly reduce
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EPA priority pollutants
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It is known that some common pathogenic organisms found in wastewater will survive more than BLANK of harsh temperature extremes
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2 years
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A storm sewer is used to
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Remove rain and other standing surface water
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Stream pollution is sometimes apparent by
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A zone of degredation
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A young lake is considered to be
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Olgotrophic
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If the septic tank will also have a garbage disposal unit feeding into it the
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Size of the tank should be increased by 50%
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Sludge accumulation in a tank serving a normal home has been estimated at
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18-21 gallons per person per year
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How often should a septic tank for a private home be serviced
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Every 3-5 years
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Human disease from aerosols of wastewater
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is related primarily to wastewater treatment by the activated sludge, trickling filter and spray irrigation processes.
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Plants absorb certain constituents of wastwater; using wastewater for irrigation of consumable plant products may present a health hazard to humans if the water contains
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Cadmium
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After the servicing (pumping) of a septic tank it is essential that the tank or lid be
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Replaced and secured for safety purposes
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