Highly variable, recalcitrant COD waste- water A small Iowa community needed to provide a pre- treatment facility for a new industrial facility produc- ing biological pesticides. The wastewater was ex- pected to be highly variable in COD and TSS concen- trations. Treatability testing by ETS indicated that a COD removal of 80% was expected; however, the fermentation solids were slightly inhibitory to anaero- bic processes. So, the pretreatm

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