CHAPTER 5: SLUDGE TREATMENT FACILITIES 5.1 …

Part B: Operation and Maintenance5 - 1 CHAPTER 5: SLUDGE TREATMENT FACILITIESCHAPTER 5: SLUDGE TREATMENT INTRODUCTIONS ludge TREATMENT processes are often the most difficult and costliest part of sewage TREATMENT . Untreated SLUDGE is odorous and contains pathogens. SLUDGE stabilisation process reduce odours, pathogens, and biodegradable toxins, as well as bind heavy metals to inert solids, such as lime that will not leach into the groundwater. The resulting biosolids can be used or disposed safely. The limiting concentrations of heavy metals and faecal coliforms in SLUDGE are mentioned in Table in CHAPTER 6 of Part-A Manual. If these concentrations exceed those values then land application shall not be permitted and the SLUDGE shall have to be disposed or contained as per the Hazardous Waste (Handling and Management) rules of residuals include primary, secondary, mixed, and chemical SLUDGE , as well as screenings, grit, scum, and ash.

floatation thickeners. When the water content of sludge is more especially, separation and thickening should be considered. 5.2.1 Gravity Thickening Gravity thickening is the most common practice for concentration of sludge and concentrates sludge through simple gravity sedimentation of the suspended solids.

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