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 providing you've got enough contact time is an option, biofiltration another one but it needs space. More expensive but compact you may find