UASB is two stage Anaerobic ...

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UASB is two stage Anaerobic and the key points are as follows: VFA, HRT, COD, Soluble COD, ULV or up flow liquid velocity...start from 0.1-0.6 and you can run in term of acid to get more granules or neutral less granular and base (Basic) you will get block granule with hight methane may be 70%. So a lots of tip to operate UASB....