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Definitions (72)
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aeration tank
A chamber for injecting air into water.
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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 build-up of solids in the system.
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activated sludge
The term "activated sludge" refers to a brownish flocculent culture of organisms developed in aeration tanks under controlled conditions. It is also Sludge floc produced in raw or settled waste water by the growth of zoological bacteria and other organisms in the presence of dissolved oxygen. Activated sludge is normally brown in color.
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activated sludge process
A common method of disposing of pollution in wastewaters. In the process, large quantities of air are bubbled through wastewaters that contain dissolved organic substances in open aeration tanks. Bacteria and other types of micro-organisms present in the system need oxygen to live, grow, and multiply in order to consume the dissolved organic &quo [..]
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aeration
The process or method of bringing about intimate contact between air and a liquid.
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aerobic bacteria
Bacteria that requires free (elementary) oxygen for growth.
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alkalinity
The capacity of water to neutralize acids, a property imparted by the water's content of carbonates, bicarbonates, hydroxides, and occasionally borates, silicates, and phosphates. Alkaline fluids have a pH value over 7. Anaerobic:
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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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anoxic
A biological environment that is deficient in molecular oxygen, but may contain chemically bound oxygen, such as nitrates and nitrites.
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bacteria
Bacteria are microscopic living organisms they are a group of universally distributed, rigid, essentially unicellular, microscopic organisms lacking chlorophyll. They are characterized as spheroids, rod-like, or curved entities, but occasionally appearing as sheets, chains, or branched filaments.
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