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Chlorine Disinfection of Blended Municipal Wastewater Effluents

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Blending is used in the wastewater industry to manage wet-weather events. Wastewater is treated through primary clarification, with flows in excess of the hydraulic capacity of the secondary system being directed to effluent disinfection. Before disinfection, the primary clarified effluent is “blended” with effluents that have been treated through the secondary system. The combined or “blended” effluents are then disinfected before being discharged to receiving waters. This study evaluated the effectiveness of chlorine to disinfect blended effluents. Experiments were conducted at bench-scale on primary and secondary effluents and three ratios of primary to secondary effluent (1:9, 3:7, and 5:5) from three publicly owned treatment works. Results from this study found that blending 10% or more primary effluent with secondary reduces the efficacy of chlorine disinfection, and coliphage survived chlorine disinfection better than bacterial indicator organisms. A simple empirical model for predicting indicator organism densities following chlorine disinfection was developed using data from this research.
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Keywords: blending wastewater; chlorine disinfection blending effluents

Document Type: Research Article

Affiliations: U.S. Environmental Protection Agency, Cincinnati, Ohio

Publication date: 2010-12-01

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  • Water Environment Research (WER) is published monthly, including an annual Literature Review. A subscription to WER includes access to the latest content back to 1992, as well as access to fast track articles. An individual subscription is valid for 12 months from month of purchase.

    Water Environment Research (WER) publishes peer-reviewed research papers, research notes, state-of-the-art and critical reviews on original, fundamental and applied research in all scientific and technical areas related to water quality, pollution control, and management. An annual Literature Review provides a review of published books and articles on water quality topics from the previous year.

    Published as: Sewage Works Journal, 1928 - 1949; Sewage and Industrial Wastes, 1950 - 1959; Journal Water Pollution Control Federation, 1959 - Oct 1989; Research Journal Water Pollution Control Federation, Nov 1989 - 1991; Water Environment Research, 1992 - present.
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