Hello Shashikant; it sounds ...

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Hello Shashikant; it sounds with COD values like that a lot can be done about preventing loss from the processing plant. This will save them money also! Secondly an out of the box thought... this waste could be of value as animal feed if zero liquid discharge means you have to evaporate the liquid anyway why not concentrate the waste to a syrup and sell as animal food?
 

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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.

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