Question:
The sludge removed from earlier steps in wastewater
Last updated: 7/31/2022
![The sludge removed from earlier steps in wastewater](https://media.kunduz.com/media/sug-question/raw/58903332-1659302922.1141403.jpeg?h=512)
The sludge removed from earlier steps in wastewater treatment can further be broken down into stable solids and methane (natural gas) by: a) aerobic digestion b) disinfection c) anaerobic digestion d) sedimentation