stepped aeration

stepped aeration: ступенчатая аэрация (с подачей кислорода по длине аэротенка)

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Sewage treatment — The objective of sewage treatment is to produce a disposable effluent without causing harm to the surrounding environment, and also prevent pollution.[1] Sewage treatment, or domestic wastewater treatment, is the process of removing contaminants… … Wikipedia
Stock car (rail) — In railroad terminology, a stock car is a type of rolling stock used for carrying livestock (not carcasses) to market. A traditional stock car resembles a boxcar with slats missing in the car s side (and sometimes end) for the purpose of… … Wikipedia

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