write two uses of sludge.
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12
Explanation:
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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4
Explanation:
Sludge is a semi-solid slurry that can be produced from a range of industrial processes, from water treatment, wastewater treatment or on-site sanitation systems.
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