Question

how is sludge useful after its treatment​

Answer 1

Answer:

The final destination of treated sewage sludge usually is the land. Dewatered sludge can be buried underground in a sanitary landfill. It also may be spread on agricultural land in order to make use of its value as a soil conditioner and fertilizer.

Explanation:

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Answer 2

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Sewage sludge treatment describes the processes used to manage and dispose of sewage sludge produced during sewage treatment. Sludge is mostly water with lesser amounts of solid material removed from liquid sewage. Reducing sludge volume may increase the concentration of some of these toxic chemicals in the sludge.