Dear Mallikarjuna,First of ...

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Dear Mallikarjuna, First of all, what are you looking for by assessing the TSS coming out of Aeration Basin? Do you want to size/design the Secondary Clarifier? or want to have sufficient Sludge Holding Tank sizing? or want to Size the Sludge Dewatering Unit (Belt Press, Filter Press etc.)? Obviously TSS (MLSS) coming out of Aeration Basin depends at least on the following factors; BOD, COD, TSS of the Influent Desired BOD, COD, TSS Output after Treatment Biological Process Selected (Activated Sludge Process, Extended Aeration Process, SBR, MBBR, MBR etc.) as every process has different dynamics. The TSS coming out of Aeration Basin are termed as MLSS (Mixed Liquor Suspended Solids) as this is Activated Sludge out of which we drain some part called Waste Activated Sludge (WAS) and a big portion we recirculate to maintain the Biological Activity in the Aeration Basin called Returned Activated Sludge (RAS). There are may Biological Processes through which different quantity of sludge is being produced like Activated Sludge System produces much Sludge then Extended Aeration System. It is required if you properly rephrased your question with some basic data influent/effluent BOD, COD, TSS at least with flow rate, so a proper response is formulated instead of a general response. Regards, Mansoor Ahmed