Evaluation of the Efficacy of a New Secondary Disinfectant Formulation Using Hydrogen Peroxide and Silver and the Formulation of Disinfection By-Products Resulting From Interactions with Conventional DisinfectantsEPA Grant Number: R825362
Title: Evaluation of the Efficacy of a New Secondary Disinfectant Formulation Using Hydrogen Peroxide and Silver and the Formulation of Disinfection By-Products Resulting From Interactions with Conventional Disinfectants
Investigators: Batterman, Stuart A. , Fattal, Badri , Shuval, Hillel , Warila, James , Zhang, Lianzhong , Lev, Ovadia , Wang, Shuqin , Mancy, Khalil H.
Institution: University of Michigan , Hebrew University
EPA Project Officer: Packard, Benjamin H
Project Period: June 15, 1997 through June 14, 2000 (Extended to June 14, 2001)
Project Amount: $594,346
RFA: Drinking Water (1997) RFA Text | Recipients Lists
Research Category: Water , Drinking Water
Description:Objectives/Hypothesis: This principal objectives of the proposed research address two critical issues associated with the use of a new secondary disinfectant formulation utilizing hydrogen peroxide and silver: (1) efficacy of the formulation to provide long term residual disinfection, including the control of coliform bacteria, bacterial regrowth and slime/biofilm control; (2) the identification and quantification of disinfection byproducts resulting from interactions with conventional chlorine based and oxidant-based disinfectants. The proposed research encompasses laboratory studies and field demonstrations which together will evaluate the efficacy of the proposed alternative disinfectant in a range of source waters and utility system characteristics. Secondary objectives of the proposed research include investigations related to taste and odor. The proposed secondary disinfectant is one of the few non-chlorine based disinfectants that can provide long term residual disinfection in drinking water systems.
By combining two or more disinfection agents it is possible to lower concentrations of each component, reduce exposures, minimize disinfection by-product (DBP) formation, and thus minimize health risks associated with disinfection. The proposed approach consists of three components: (1) laboratory evaluation of microbial disinfection efficacy, including optimal formulation of the secondary disinfectant and optimal doses of primary and secondary disinfectants; (2) laboratory evaluation of DBP formation resulting from interactions with various primary disinfectants; and (3) field demonstration of the disinfectant to provide "real world" results. These components are designed to provide a comprehensive evaluation of the microbial disinfection efficiency and DBP formation potential of the new disinfectant.
The proposed research will develop information yet unavailable regarding long term disinfection efficacy in different source waters and environmental and utility conditions. It will identify and quantify the disinfection by-products of the new disinfectant, and determine its optimum dosages. These results will be compared to disinfection efficacy and by-products from conventional disinfectants. These results will be amenable for use in exposure and risk assessments of pathogens and DBPs to support future policies and decisions regarding the most appropriate disinfection approach.