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There are two main types of submerged diffused aeration systems for lagoon applications: floating lateral and submerged lateral. Both these systems utilize fine or medium bubble diffusers to provide aeration and mixing to the process water. The diffusers can be suspended slightly above the lagoon floor or may rest on the bottom.
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.
Mixed sludge and sewage is decanted at the surface and separated into supernatant and sludge components. The efficiency of deep shaft treatment can be high. Surface aerators are commonly quoted as having an aeration efficiency of 0.5–1.5 kg O 2 /kWh (1.1–3.3 lb O 2 /kWh), diffused aeration as 1.5–2.5 kg O 2 /kWh (3.3–5.5 lb O 2 /kWh).
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]
They deserve a higher priority from our state and federal partners to ensure acceptable water quality in the lagoon. Truth is that Lake O discharges are a fact of life in South Florida, and with ...
Mixed liquor suspended solids (MLSS) is the concentration of suspended solids, in an aeration tank during the activated sludge process, which occurs during the treatment of waste water. The units MLSS is primarily measured in milligram per litre (mg/L), but for activated sludge its mostly measured in gram per litre [g/L] which is equal to ...
"The proposed 9.6-million gallon manure lagoon would be located over the Allen County Sole Source Aquifer, which is the drinking water source for over 20,000 people including Spencerville, and ...
The rain and subsequent flooding from Hurricane Florence drenched hog farms and power plants, threatening the safety of local drinking water.
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