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I was recently working on a project as expert witness, centred on a UASB followed by Activated Sludge in the Middle East treating sewage from a sewer system. The idea was that the UASB would remove about 70% of the BOD load at a lower opex than activated sludge. Unfortunately what the designers overlooked was sea water intrusion into the sewers. The resulting high sulphate generated hydrogen sulphide in the UASB which then overloaded the downstream AS. I would be happy to discuss your interest in UASB further if you could give more information about the context in which you are considering it. Regards Richard