write any two uses of sludge
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The usage of municipal sewage sludge as fuel supports the saving of fossil fuel emission. Sludge is usually treated before disposal to reduce water content, fermentation propensity and pathogens by making use of treatment processes like thickening, dewatering, stabilisation, disinfection and thermal drying.
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sludge is use to recovered in the primary treatment a
stage is further made safe by microorganisms.
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