Could you confirm the ...

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Could you confirm the Quality (BOD/COD and N) at the Inlet of SBR.  I thought that might be :

1. Start up method or acclimatization is fail.

2. Inproper Bacteria Solution for your waste

If it possible, introduce some sludge to SBR from your waste sludge to fastened up the process.  Waste Sludge can work better than the liquid microorganism