The presence of inert organic solids in sludge is due either to their presence in the influentwastewater (e.g. In the sludge handling units, a combination of any two or three of the above types is introduced.ĭuring the biological treatment of wastewater, in addition to cell biomass, a large amount of non-biodegradable (inert) solids in particulate form, incoming with the influent raw wastewater, contributes significantly to sludge production. chemical sludge – produced by precipitation of specific substances (i.e.
secondary sludge (also called biological sludge) – produced by biological processes such as activated sludge or biofilm systems contains microorganisms grown on biodegradable matter (either soluble or particulate), endogenous residue and inert solids not removed in the primary settling (where a primary settler is present) or entering with the raw wastewater (where no primary settler is present) TS content in secondary sludge is in the range 0.5-1.5% (Turovskiy and Mathai, 2006).primary sludge – produced by settleable solids removed from raw wastewater in primary settling characterised by high putrescibility and good dewaterability when compared to biological sludge TS content in primary sludge is in the range 2-7% (Turovskiy and Mathai, 2006).In the wastewater handling units in a WWTP the types of sludge produced are: To manage WWTPs effectively and efficiently, it is absolutely necessary to extract waste sludge, including inert solids and excess biomass, in order to prevent their accumulation within the system. The volume of sludge produced in a WWTP is only about 1% (dewatered sludge is 0.5‰) of the volume of influent wastewater to be treated. Reduction of Sludge Production in Wastewater Treatment Plants Sludge Production
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