Dear Thakur The UASB may be ...

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Dear Thakur 

The UASB may be overloaded and the question is what is the organic load rate.

To reduce the BOD you may consieder a second anaerobic digester and to increase the solids retention time (I did it in MSW A.D). 

Polishing by an aerobic system is obviously required. Attached growth may reduce the aerobic sludge production

Feel free to contact me.

Ilan Katz

ilankz@yahoo.com

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It is a good idea to go for a  second ​anaerobic ​digester.  Do you have experience on this ( please Share  if possible) any article , research paper is also welcome.

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I was operating such a system in Arrow Ecology, Israel. Arrowbio-global.com

I can check your vertical velocity and OLR as well as suggest a secondary reactor or different operational scheme, according to water analysis and operational parameters  

please contact by Email: ilankz@yahoo.com

Ilan

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