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ENVIRONMENTAL TECHNOLOGY VERIFICATION REPORT ON-SITE GENERATION OF SODIUM HYPOCHLORITE GENERATION SYSTEM USED FOR DISINFECTION IN DRINKING WATER
Citation:
ENVIRONMENTAL TECHNOLOGY VERIFICATION REPORT ON-SITE GENERATION OF SODIUM HYPOCHLORITE GENERATION SYSTEM USED FOR DISINFECTION IN DRINKING WATER. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/R-03/017, 2000.
Description:
The EPA and NSF verified the performance of the ClorTec Model MC 100 System under the EPA's ETV program. The concentrated hypochlorite generator stream from the treatment system underwent a twice daily analysis from March 8 to April 6, 2000. The chlorine analyses were conducted on site in United Water Pennsylvania's Hummelstown Water Treatment Plant (WTP) operators lab. The hypochlorite generator stream was analyzed using two methods of measuring total chlorine: Standard Method 4500-ClF (EPA approved) and Standard Method 4500-Cl B. The average sodium hypochlorite concentration was 0.90% � a standard deviation of 0.04% using Standard Method 4500-Cl B and 0.91% � a standard deviation of 0.08% using Standard Method 4500-Cl F. The average sodium chloride concentration in the brine fed to the generator electrolytic cells during the verification testing was 3.53%, higher than ClorTec's specified value of 3.0%. The average DC current and voltage applied to the electrolytic cells
during the ETV were 183 amps and 46 volts, respectively. ClorTec states that the amperage and voltage should be approximately 185 amps and 48 volts. No attempt was made to adjust the brine pump feed rate during the verification testing; it is factory set to deliver the concentrated brine (30% sodium chloride) to a softened side stream from the WTP finished water by a ratio of approximately ten parts water to one part brine prior to entering the generator. After the tenth day of testing, the chlorine concentration in the hypochlorite concentrate stream generally trended higher. This roughly correlated with a higher sodium chloride concentration.