stepped aeration
1Sewage 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… …
2Stock 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… …
