Civil Engineering ⇒ Topic : Decomposition of Sewage
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Atharv
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Decomposition of Sewage : Fresh sewage has oxygen content of about 2 to 5 mg/litre. Consequently the organic matter is acted upon by the aerobic and facultative bacteria play their role, resulting in spliting up of the complex organic compounds, setting free the oxygen content. Gases like ammonia, methane, hydrogen sulphide and carbon dioxide are given off. The process is called putrefaction and is the first stage in the decomposition of sewage. Following equipment is used for putrefaction of sewage :- 1. Septic tanks 2. Imhoft tanks 3. Sludge digestion tanks For oxidation, the equipment used is :- 1. Contact beds 2. Trickling filters 3. Aeration tanks | |
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