Which of the following is not the use of anaerobic treatment?

Which of the following is not the use of anaerobic treatment? Correct Answer High levels of microbial growth

There are many reasons for using anaerobic processes for waste treatment. It is useful in achieving a higher loading rate, low power BOD treatment, organic matter is metabolized into a stable form, ease of handling, low levels of microbial growth due to the anaerobic process.

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