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An aerated lagoon (or aerated pond) is a simple wastewater treatment system consisting of a pond with artificial aeration to promote the biological oxidation of wastewaters. [1] [2] [3] [4]
Aerated lagoons rely upon mechanical aerators to provide oxygen to stabilize organic matter. Aerated lagoons may be used as the first stage in the treatment line instead of anaerobic ponds to limit release of malodorous gases, but with energy and maintenance requirements causing higher operating costs.
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.
Aerated lagoon; Aerobic granular reactor; Aerobic granular sludge technology; Aerobic granulation; Aerobic treatment system; Anaerobic clarigester; Anaerobic digester types; Anaerobic digestion; Anaerobic filter; Anaerobic lagoon; Anammox; API oil–water separator; Belt filter; Bioconversion of biomass to mixed alcohol fuels; Biofilters ...
A 353-hectare portion of the bay connected to the Rock Creek has been aerated using pipes since 2016. The system started as a large-bubble system intended mainly for de-stratification, creating a 74-ha oxic zone. It was upgraded in 2019 to fine-bubble injectors to provide more oxygen directly. [18]
Aerated lagoons provide less effective mixing than conventional activated sludge systems and do not achieve the same performance level. The basins may range in depth from 1.5 to 5.0 metres. Surface-aerated basins achieve 80 to 90 percent removal of BOD with retention times of 1 to 10 days. [ 26 ]
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.
Evaporation ponds are also used to dispose of brine from desalination plants. [4] Evaporation ponds at contaminated sites remove the water from hazardous waste, which reduces its weight and volume and allows it to be more easily transported and stored.