Question

What can sludge from a sewage treatment plant be used?

(a) Non-organic solid formation

(b) Non-biosolid formation

(c) Waste formation

(d) Biosolid formation

The question was posed to me in exam.

I'm obligated to ask this question of By-Products topic in chapter Effluent Treatment of Bioprocess Engineering

Answer 1

Right option is (d) Biosolid formation

For explanation: Biosolids is a term often used in conjunction with reuse of sewage solids after sewage sludge treatment. Biosolids can be defined as organic wastewater solids that can be reused after stabilization processes such as anaerobic digestion and composting.