What is sludge?
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Sludge is the processed form of human , plant and aminal wastes . Sludge can be burned into ashes and used for soil conditioning or it can be used for the production of biogas .
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Sewage sludge is the residual, semi-solid material that is produced as a by-product during sewage treatment of industrial or municipal wastewater. The term "septage" also refers to sludge from simple wastewater treatment but is connected to simple on-site sanitation systems, such as septic tanks.
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