What is the percentage of thickness that can be achieved for secondary sludge?

To remove 2% primary sludge which of the following size of mesh of a cyclone gritter is used?

Toxic chemicals are removed from liquid sewage by ___

Sand drying bed is used for filtration.

What is the solid loading rate in kg/ m2.d considered while designing a thickener to treat the primary sludge?

Which of the following processes is rarely used?

In anaerobic digestion system which of the following statement holds good?

Anaerobic digestion can be used to produce fuel.