what is the use of a sludge produced in a WWTP(waste water treatment plants)?
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Sewage sludge is the solid, semisolid, or slurry residual material that is produced as a by-product of wastewater treatment processes. This residue is commonly classified as primary and secondary sludge. ... Some sewage plants also receive septage or septic tank solids from household on-site wastewater treatment systems.
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Digested sludge is passed through a dewatering step; the dried solids are disposed of, and the water is sent back to secondary treatment. ... Treatment and disposal of sewage sludge are major factors in the design and operation of all wastewater treatment plants.
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