Who introduced the term biosolids?

What is the thickened concentration of the thickened sludge from the rotating biological contractor?

Secondary sludge constitutes which of the following?

The liquid has high contents of phosphorus and nitrogen, if the sludge has been______

Anaerobic digestion is carried out in ____

What is the volumetric organic loading in Kg COD/ m3 day for an anaerobic contact digestion process?

Which year was the term biosolids introduced?

Sand drying bed is used for filtration.