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Definitions (51)
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waste activated sludge
That portion of sludge from the secondary clarifier in the activated sludge process that is wasted to avoid a buildup of solids in the system.
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activated sludge
Sludge withdrawn from the secondary clarifier in the activated sludge process, consisting of living micro-organisms, non-living organic matter, and inorganic materials.
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activated sludge process
A common method of disposing of pollutants in wastewaters. In the process, large quantities of air are bubbled through wastewaters that contain dissolved organic substances in open aeration tanks. Bac [..]
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aeration
The process of method of bringing about intimate contact between air and a liquid.
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aeration tank
A chamber for injecting air into water.
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aerobic bacteria
Bacteria that require free (elementary) oxygen for growth.
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anaerobic bacteria
Bacteria that grow in the absence of free oxygen and derive oxygen from breaking down complex substances.
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biological oxidation
The process by which bacteria and other types of microorganisms consume dissolved oxygen and organic substances in waste water, using the energy released to convert organic carbon into carbon dioxide [..]
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biochemical oxygen demand
A quantitative measure of the oxygen needed by bacteria and microorganisms for the biological oxidation of organic wastes in a unit volume of waste water. BOD is generally measured in milligrams per l [..]
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chemical oxygen demand
A quantitative measure of the amount of oxygen required to oxidize all organic compounds in a unit volume on waste water – non-biodegradable as well as the BOD. The COD level can be determined more re [..]
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