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In which secondary treatment of sewage treatment sludge is broken down in an anaerobic digester?

In which secondary treatment of sewage treatment sludge is broken down in an anaerobic digester? Correct Answer Activated sludge process

In sedimentation tank, during sludge treatment sludge is broken down in an anaerobic digester. The digester sludge is pumped onto sludge drying beds. The dried sludge is a good source of manure.

Related Questions

Statement (I): Anaerobic sludge digester, by itself, is considered to be the better method than other methods of sludge treatment: Statement (II): During anaerobic sludge digestion, CH4 is produced; also rodents and other pests are attracted when digester sludge is dried. 
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Secondary sludge includes treated sewage sludge.
Which of the following is obtained in the secondary tank in two stage sludge digester?
Gases emitted from the digester indicates the amount of biomass left to be broken down.
There are three distinct stages that occur in the natural process of sludge digestion due to biological action. What is the name of the first stage in which fresh sewerage – sludge is acted upon by anaerobic and facultative bacteria’s which decompose easily available food matters?