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Open Access Integration of the Recip® System with U.V. Disinfection for Decentralized Wastewater Treatment and the Impact on Microbial Dynamics

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A novel on-site wastewater treatment system (ReCip®) was modified by installing low pressure, low intensity U. V. lights (25 and/or 65 watt) into the system's pumping operation. This modification exposed wastewater to low intensity U.V. light up to 24 times per day. Additionally, two subsurface-flow wetlands were installed down-gradient from the ReCip-U.V. treatment unit to facilitate removal of nitrate and to evaluate potential re-growth of indicator organisms (Escherichia coli and Enterococcus). The system treated from 200 to 400 gallons of wastewater each day (0.87 m3 influent +/- 0.266 m3/day). During the final six months of monitoring, the U.V. light configuration (65 watt lamps in each of cells C and D) resulted in 3-5 log reductions in MPN of Escherichia coli and Enterococcus. The use of U.V. did not impact wastewater treatment and the integrated ReCip-U.V. system provided excellent removal of suspended solids, odor, turbidity, chemical oxygen demand (COD), TKN, and ammonia-nitrogen.
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Document Type: Research Article

Affiliations: Environmental Technologies, Tennessee Valley Authority Muscle Shoals, AL, USA 35662

Publication date: 2007-07-01

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