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Peracetic Acid as a Green Disinfectant for Combined Sewer Overflows
Citation:
Patterson, C., V. Namboodiri, Dan Murray, D. Schupp, B. Smith, J. Maziuk, AND B. Freeborn. Peracetic Acid as a Green Disinfectant for Combined Sewer Overflows. Presented at Civil Engineering Conference in the ASIA Region - ASCE, Honolulu, HI, August 31 - September 02, 2016.
Impact/Purpose:
Like many cities in the USA, Cincinnati, Ohio is attempting to find the best way to meet state and federal requirements concerning combined sewer overflow (CSO) wastewater. The Muddy Creek CSO treatment facility was constructed to provide treatment for CSO Numbers 198 and 216 from the Westwood Trunk sewer. The Metropolitan Sewer District of Greater Cincinnati (MSDGC) is currently using sodium hypochlorite for disinfection in this treatment facility. Because of degradation of hypochlorite during storage and the formation of chlorinated disinfection byproducts (DBPs), MSDGC is evaluating alternative disinfectants. Peracetic acid (PAA), a potent disinfectant for a wide spectrum of microorganisms, is one alternative being considered.
Description:
This cooperative research and development agreement between U.S. EPA, Solvay, MSDGC, and CB&I is evaluating the potential of PAA for disinfection of Muddy Creek CSO wastewater and comparing that with sodium hypochlorite disinfection. This presentation will document the effectiveness of sodium hypochlorite and PAA for the inactivation of E. coli in CSO wastewater using laboratory bench-scale jar tests and Muddy Creek field site studies based on the following items:•Storage, shelf life, and application of the disinfectants.•Effectiveness of the disinfectants in the inactivation of E. coli.•Formation of harmful byproducts by the disinfectants.•Operation and maintenance costs, including the cost of the disinfectant, its storage, application, and neutralizing agent for the disinfectant to maintain the Ohio EPA guideline for residual disinfectant at the discharge point.
