Aquatic Toxicity Reduction and Water Reuse at a Metal Finishing Plant

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Abstract:

In 2003, the Bon L Manufacturing Company took the final steps to meet the aquatic toxicity requirements of its NPDES permit. Prior to the final steps, Bon L had implemented water and waste minimization measures within the manufacturing plant to reduce water usage and waste generation. These measures showed a significant reduction in wastewater flow and a decrease in contaminant loading. However the effluent toxicity persisted due to the high levels of total dissolved salts, metals and surfactants.

Analyses of treatment alternatives were performed and a treatment system utilizing reverse osmosis was selected. The selected treatment process consisted of metals precipitation, carbon adsorption, ion exchange and reverse osmosis. The effluent from the treatment system is reused by the manufacturing operations. The sludge generated by metals precipitation is dewatered with a filter press. The brine generated from the reverse osmosis process is evaporated to achieve an 80% volume reduction. The plant has been operating successfully since the winter of 2004.

Document Type: Research Article

DOI: http://dx.doi.org/10.2175/193864708788805305

Publication date: January 1, 2008

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  • Proceedings of the Water Environment Federation is an archive of papers published in the proceedings of the annual Water Environment Federation® Technical Exhibition and Conference (WEFTEC® ) and specialty conferences held since the year 2000. These proceedings are not peer reviewed.

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