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Successful Application of Submerged Ultra Filtration Membranes to Meet Stringent NPDES Permit Limits for Stormwater Overflows

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Stormwater discharges from an industrial aerospace complex located in Ventura County, California require substantial treatment in order to meet the stringent NPDES permit limits. Overflows are generated during heavy rain events when onsite storage pond capacities are exceeded. Multiple treatment configurations have been tested to remove the constituents of concern (COCs) below the permit limits. Past experiences have indicated that chemical treatment with rapid clarification consistently produced water quality close to the permit limits. Therefore, additional treatment is required to fully meet the treatment goals. Ultrafiltration (UF) membranes were tested for this effect during a pilot study conducted to determine performance of a submerged membrane unit. Effluent from the rapid clarification unit (i.e., Kruger's ACTIFLO) was further treated with multimedia filters and used as influent to the membrane pilot. The submerged UF membrane was able to remove approximately 99% of the influent turbidity. Ultimately, the submerged UF membrane proved to be a viable treatment alternative that consistently removed COCs below their NPDES permit limits, which in this particular case are even more stringent than drinking water limits for certain COCs.
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Keywords: NPDES; Stormwater; UF membranes; iron; manganese; ultrafiltration

Document Type: Research Article

Publication date: 2010-01-01

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