Answer:
Sludge.
Step-by-step explanation:
- A sewage is a type of the wastewater that s produced by the community of people and is characterized by the volume and the rate of flow and has various toxic chemicals and can be the industrial and urban origin.
- The leftover the solid part of this waste generated is the sludge and is a semi-solid slurry and is created from a treatment plant that is used to the treatment of the wastewater.