Sludge is of different ...

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Sludge is of different quality. it varies with what source/s and conditions of a sludge. Some Industrial Plants are re-using their effluent after the Membrane Biological Process as Process Water. Sludge per se after the complete oxidation of organic and inorganic wastes are mostly good source of agricultural protein. But it has to undergo a process otherwise it emits foul odour during decomposition process of organic/inorganic wastes.