Question

Dried __________ is used as manure.

Answer 1

Sludge:

1. Sludge refers to the semi-solids that settle during wastewater treatment.
2. It is used to make biogas and manure since it is organic waste. A scrapper collects the sludge.
3. It is moved to a separate tank where anaerobic microorganisms break down it.
4. Microbes and human faeces settle down after the aerator tank and produce activated sludge. Sand drying beds or machines remove the water.
5. Sludge that has been dried is utilized as manure, restoring organic matter and nutrients to the soil.

Final answer: Dried sludge is used as manure.