Dear Carlos, I guess that ...

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Dear Carlos,

I guess that this is an activated sludge process with primary works and sludge treatment too, all being sources of odors mainly due to H2S, mercaptants, VFAs for the nastiests and detergents too. Wet scrubbers with chemicals are fine, fouled air recycling through the activated sludge tank(s) is an option, ferric chloride or equivalent added at the inlet works will stop H2S.

Air flows are probably high so efficiency/yield in terms of contact time (ie size of equipment) is a key driver added to operating costs (energy for air fans + chemicals + maintenance + byproducts if any).

Do not hesitate to get back in touch, in particular because more info about the context of this plant woule be needed.

Best regards,

V. Urbain