engineering recuitment JSSC JE Mock Test 2023 Environmental Engineering Sewage

Which of the following is incorrect regarding sludge digestion?

1
Digestion period for thermophilic digestion is 30 days
2
The desired range of pH value for efficient digestion is 6.8 to 7.2
3
Digestion destroys pathogenic bacteria
4
Carbon, Oxygen, Hydrogen, Nitrogen, Sulphur, and Phosphorous are the important nutrients required for bacterial growth in sludge
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