Explain the biological action and process of sludge digestion

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written 6.7 years ago by

teamques10 ★ 69k

• modified 6.5 years ago

Anaerobic digestion is biological which is carried out without the presence of oxygen.
It can be the thermophilic digestion in which the sludge is fermented in tanks at about 55°C temperature.
The another method is mesophilic which is carried at a temperature of 36°C.
Between these two methods the thermophilic method has a shorter retention time. So it needs smaller tanks still this method is more expensive as it needs huge energy supply.
The mesophilic anaerobic digestion is also a common method used to treat the sludge developed at the treatment plant . This sludge is fed into large tanks and is held atleast for 12 days to complete the digestion process.
It has four stages as stated below:-

1) Hydrolysis

2) Acidogenesis

3) Acetogenesis

4) Methanogenesis
- In the process the complete proteins and sugars are broken down to form simple compounds. eg water, carbon dioxide , methan, etc.
- The biogas is generated with high proportion of methane. The method of energy developed through the biogas is used to generate heat and power.

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