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West Liberty Foods (WLF) meat processing plant in Mount Pleasant, Iowa was discharging wastewater into a local creek. New regulations required that suspended solids (TSS), BOD's and FOG's (fats oil and grease) are removed almost completely before a discharge. The MBBR system
was installed to achieve these goals. However, increase in plant capacity and amount of contaminants in wastewater resulted in complete failure of the installed system. To enable the performance of the MBBR, the GEM flotation – pretreatment System was installed ahead of the bioreactor.
The System reduced TSS, FOG and BOD to the levels that MBBR could handle. The System also introduced capabilities to robustly neutralize the pH, eliminate antimicrobial agents and reduce amount of foam forming substances. Large equalizations tanks were built to average out fluctuations in
wastewater contaminants. The installed System performs well, saving WLF large amounts in discharge fees and fines.
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