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

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Abstract:

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.

Keywords: DECENTRALIZED; DISINFECTION; RECIP®; U. V; ULTRA VIOLET; WASTEWATER TREATMENT

Document Type: Research Article

DOI: http://dx.doi.org/10.2175/193317707X224077

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

Publication date: July 1, 2007

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  • Water Practice™ publishes peer-reviewed articles and reports focusing on applied water studies. Topics include monitoring, facility operations and maintenance, management, policy, and other issues of interest and concern to water practitioners. The Journal publishes on a monthly to bi-monthly basis and is available online only.
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