Methods Of Sludge Disposal
What happens to the sludge that is produced after the wastewater passes through the sewage treatment plant? Sludge consists of human faeces and other organic matter. It also has large amounts of water and needs to be thickened so that it can be transported easily and used as compost in farmlands. There are three methods to do so.
Sludge may be incinerated, i.e., burnt into ashes.The ash is used as soil conditioner or as a construction material.
Sludge may be dewatered and then combined with other wastes to make fertilizers.
Sludge may be composted or processed to produce gases that can be used as fuel.
