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What is sludge and where it is used? |
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Answer» Answer: Sewage sludge is the residual, semi-solidmaterial 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. When fresh sewage or wastewater enters a PRIMARY settling tank, approximately 50% of the suspended solid matter will settle out in an HOUR and a half. This collection of solids is known as raw sludge or primary solids and is said to be "fresh" before anaerobic processes become active. The sludge will become putrescent in a short TIME once anaerobic bacteria take over, and must be removed from the sedimentation tank before this happens |
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