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An aerated lagoon (or aerated pond) is ... In a surface-aerated system, the aerators provide two functions: they transfer air into the basins required by the ...
Aerated lagoons are a low technology suspended-growth method of secondary treatment using motor-driven aerators floating on the water surface to increase atmospheric oxygen transfer to the lagoon and to mix the lagoon contents. The floating surface aerators are typically rated to deliver the amount of air equivalent to 1.8 to 2.7 kg O 2 /kW·h ...
Facultative stabilization ponds may also be used for treatment following other types of treatment processes such as upflow anaerobic sludge blanket (UASB) reactors, oxidation ditches or aerated lagoons. Compared with anaerobic ponds, facultative ponds are shallower (1.5 to 2.5 m deep) and have much larger surface areas.
Natural aeration is a type of both sub-surface and surface aeration. It can occur through sub-surface aquatic plants. Through the natural process of photosynthesis, water plants release oxygen into the water providing it with the oxygen necessary for fish to live and aerobic bacteria to break down excess nutrients. [3]
Facultative lagoon (polishing pond) providing tertiary treatment after a constructed wetland in Hamburg-Allermöhe, Germany. Overflow from the facultative lagoon may be routed through one or more polishing ponds supporting lower populations of anaerobic micro-organisms and a higher proportion of aerobic organisms adapted to survival in lower concentrations of organic material.
These anaerobic conditions are uniform throughout the lagoon, except in a small surface level. [11] Sometimes aeration is applied to this level to dampen the odors emitted by the lagoons. If surface aeration is not applied, a crust will form that will trap heat and odors. [11] Anaerobic lagoons should retain and treat wastewater from 20 to 150 ...
Activated sludge tank at Beckton sewage treatment plant, UK.The white bubbles are due to the diffused air aeration system. The activated sludge process is a type of biological wastewater treatment process for treating sewage or industrial wastewaters using aeration and a biological floc composed of bacteria and protozoa.
Facultative lagoons are waste stabilization ponds providing stable stratified habitat for both aerobic organisms near the surface and anaerobic organisms in deeper water. Infiltration basins are ponds designed to percolate their contents into groundwater though underlying permeable soils serving as a filter to remove solids and some dissolved ...
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