Packaged STP/ ETP/ MBR Plants

Sewage treatment is the process that removes the majority of the contaminants from waste-water or sewage and produces both a liquid effluent suitable for disposal to the natural environment and a sludge. To be effective, sewage must be conveyed to a treatment plant by appropriate pipes and infrastructure and the process itself must be subject to regulation and controls. Other wastewaters require often different and sometimes specialised treatment methods. At the simplest level treatment of sewage and most wastewaters is through separation of solids from liquids, usually by settlement. By progressively converting dissolved material into solid, usually a biological floc and settling this out, an effluent stream of increasing purity is produced.

Sewage is the liquid waste from toilets, baths, showers, kitchens, etc. that is disposed of via sewers. In many areas sewage also includes some liquid waste from industry and commerce. In many countries, the waste from toilets is termed foul waste, the waste from items such as baths, kitchens is termed sullage water, and the industrial waste is termed trade waste. The division of household water drains into greywater and blackwater is becoming more common in the developed world, with grey water being permitted to be used for watering plants or recycled for flushing toilets.