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Comparative Evaluation of Sodium Hypochlorite and Peracetic Acid in Disinfection of Muddy Creek Combined Sewer Overflow of Metropolitan Sewer District of Greater Cincinnati
Citation:
Namboodiri, V., C. Patterson, Dan Murray, B. Smith, AND J. Maziuk. Comparative Evaluation of Sodium Hypochlorite and Peracetic Acid in Disinfection of Muddy Creek Combined Sewer Overflow of Metropolitan Sewer District of Greater Cincinnati. U.S. Environmental Protection Agency, Washington, DC, EPA/600/R-16/068, 2016.
Impact/Purpose:
Peracetic acid (PAA) is emerging as an environmentally benign alternative to chlorination in waste water and CSO treatment across the United States of America. Several Municipalities under Region 5 and Region 4's NPDES permitting program have been testing the use of PAA to replace chlorine. In this study, we evaluated the effectiveness and potential of PAA compared to chlorination. The results of this CSO treatment study with PAA is very promising and will be valuable for various EPA Regions near future. The collaborative research efforts of EPA ORD's Water Cluster Program, MSDGC (City of Cincinnati), and Solvay chemicals (CRADA Partner) is presented in this report.
Description:
Peracetic acid is a chemical oxidizer that is used as a disinfectant in this study. It has the chemical formulation of CH3COOOH – essentially acetic acid with an extra oxygen molecule. It is the product of acetic acid reacted with hydrogen peroxide. Peracetic acid is used in parts of Europe as a replacement for chlorine disinfection in wastewater, and it is currently used in North America in the food processing industry as a disinfectant for hard surfaces that have been in contact with fruits, vegetables, meats, and eggs. Recently, peracetic acid is being seen and used as a replacement for sodium hypochlorite to disinfect secondary effluent from wastewater treatment plants.This report summarizes a comparative evaluation of sodium hypochlorite and PAA for the disinfection of CSO at MSDGC’s Muddy Creek treatment facility. It includes background information and baseline treatment evaluation of sodium hypochlorite at the Muddy Creek HRT facility, and bench-scale/field-scale studies with the two alternative disinfectants.