I recommend a settler as the first step as an easy way to reduce BOD into the USAB. If the USAB effluent is greater than 5000 mg/L BOD add a second USAB- follow with Activated sludge -- Thicken and dewater the sludges for disposal.

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I recommend a settler as the first step as an easy way to reduce BOD into the USAB. If the USAB effluent is greater than 5000 mg/L BOD add a second USAB- follow with Activated sludge -- Thicken and dewater the sludges for disposal.