I am pretty sure all the ...

I am pretty sure all the answers above properly addressed the pre-screening and sedimentation by clarification which will reduce TSS (Total suspended solid) to the appropriate level for required effluent stream or possibly to the reuse/outfall requirements. MBR (Membrane bio reactor) is also good candidate for removing TSS for next process if the plant has not enough space and the energy can be compensated somehow. Even though some chemical process involved in clarification and bio-process (coagulation & flocculation including chemical injection for COD and BOD control) can be beneficial for reducing some of TDS, it won’t drastically reduce the TDS (Total dissolved solid). To reduce TDS you probably want to use membrane based approach after you reduced TSS drastically down to to the level of SDI 5 or less. Hope I addressed what you need. Thanks.