If you are getting ...

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If you are getting substantial COD and solids removal across the Imhoff tank, it is working well. High influent sulfate does lead to organisms that produce H2S under anaerobic conditions such as the sludge layer. This is just natural to the process.

Detergents are not decomposed in the Imhoff treatment tank and will cause foaming. Foam can also be attributed to soluble intermediates from the tank's microbial population.