There are many Chemical Physical and Biological methods for treatment of aqueous waste waters. Most combination of these chemical, Physical and biological treatments is necessary to remove contaminants effectively.
The method has to be determined based on the requirement of the waste water and its contaminants.
Simple Household Sewer Treatment
Septic system: Though simple but very important system covering rural and urban areas in most of the developed and under developing countries.
Septic systems are constituted of number pipe lines by which the house hold aqueous waste water is drained to a series of tanks which are connected by pipe lines. The first tank is connected to inlet line and the last to outlet.
The septic tank has two chambers usually each with manhole and separated by a wall that has opening on the roof and floor of the tank.
The household waste water enters the first chamber of the first tank; at this point, the solids settle to the bottom and the scum floats to the top. The solids are settled and digested, which lessens the content of the tank. The remaining liquid flows through the dividing wall and into the second chamber. Here, further settlement takes place so that the excess liquid becomes nearly clear and empties into the drainage field, also known as the leech field. The remaining impurities of the water are then broken down into the soil and taken to irrigate plants around.
The sewage treatment process facilitates the achievement of water quality objectives.
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