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11 Cards in this Set
- Front
- Back
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Groundwater Contamination can result from which of the following? Oil and gas production Agricultural activities Industrial and manufacturing processes Natural sources that may be influenced by or result from human activities All of the above. |
All of the above |
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The BOD is a measure of _____ required for the biodegradation of the organic material present in a body of water. nitrogen oxygen hydrogen carbon |
oxygen |
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Lead attacks the ________ system of most animals. Nervous Skeletal Endocrine Urinary |
Nervous |
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Which metal is responsible for damage to chromosomes? Calcium Lead Mercury Iron |
Mercury |
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Which is (are) essential nutrients for plants? Iron Mercury Nitrogen and phosphorus Cadmium Lead |
Nitrogen and phosphorus |
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What is the main component of sewage from flushed toilets? Metals Phosphorous-containing compounds Nitrogen-containing compounds Water Organic matter |
Water |
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In the PRELIMINARY treatment of sewer waters, branches and other large objects are removed by The primary settling tank A bar screen The grit chamber Anaerobic Digester Aeration tank |
A bar screen |
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Select the correct statement about PRIMARY treatment of wastewater. It does not remove any suspended solids or oxygen demanding wastes typically removes 25% percent of both suspended solids and oxygen demanding wastes It typically removes 90 percent of both suspended solids and oxygen demanding wastes It typically removes roughly 50 percent of both suspended solids and oxygen demanding wastes It typically removes 70 percent of both suspended solids and oxygen demanding wastes |
It typically removes roughly 50 percent of both suspended solids and oxygen demanding wastes |
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Select the BEST answer. Final clarification and disinfection of wastewater is done by using ____________. Ozone Any one of the above UV light Chlorine |
Any of the above |
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Which of the following is NOT true about anerobic digestion of sludge? It involves the use of bacteria It does not involve oxygen It involves oxygen Organic matter is broken down into methane, carbon dioxide and several foul-smelling organic compounds |
It involves oxygen |
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pathogens |
disease-causing bacteria, viruses and other microorganisms or their eggs
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