Disinfection of model indicator organisms in a drinking water pilot plant by using PEROXONE

Journal Article · Fri Sep 01 00:00:00 EDT 1989 · Applied and Environmental Microbiology; (USA)

OSTI ID:5257166

Wolfe, R L; Stewart, M H; Liang, S; McGuire, M J ^[1]

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1. Metropolitan Water District of Southern California, La Verne (USA)

PEROXONE is an advanced oxidation process generated by combining ozone and hydrogen peroxide. This process stimulates the production of hydroxyl radicals, which have been shown to be superior to ozone for the destruction of some organic contaminants. In this study, pilot-scale experiments were conducted to evaluate the microbicidal effectiveness of PEROXONE and ozone against three model indicator groups. Escherichia coli and MS2 coliphage were seeded into the influent to the preozonation contactors of a pilot plant simulating conventional water treatment and were exposed to four ozone dosages, four hydrogen peroxide/ozone weight ratios, and four contact times in two source waters--Colorado River water and state project water--of different quality. The removal of heterotrophic plate count bacteria was also monitored. Results of the study indicated that the microbicidal activity of PEROXONE was greatly affected by the applied ozone dose, H2O2/O3 ratio, contact time, source water quality, and type of microorganism tested. At contact times of 5 min or less, ozone alone was a more potent bactericide than PEROXONE at all H2O2/O3 ratios tested. However, this decrease in the bactericidal potency of PEROXONE was dramatic only as the H2O2/O3 ratio was increased from 0.5 to 0.8. The fact that the bactericidal activity of PEROXONE generally decreased with increasing H2O2/O3 ratios was thought to be related to the lower ozone residuals produced. The viricidal activity of PEROXONE and ozone was comparable at all of the H2O2/O3 ratios. Heterotrophic plate count bacteria were the most resistant group of organisms. Greater inactivation of E. coli and MS2 was observed in Colorado River water than in state project water and appeared to result from differences in the turbidity and alkalinity of the two waters. Regardless of source water, greater than 4.5 log10 of E.

• OSTI ID: 5257166
• Journal Information: Applied and Environmental Microbiology; (USA), Journal Name: Applied and Environmental Microbiology; (USA) Vol. 55:9; ISSN AEMID; ISSN 0099-2240
• Country of Publication: United States
• Language: English

Related Subjects

560300* -- Chemicals Metabolism & Toxicology
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
BACTERIA
BACTERIOPHAGES
BIOSYNTHESIS
CLEANING
CONTROL
DECONTAMINATION
ESCHERICHIA COLI
HYDROGEN COMPOUNDS
HYDROGEN PEROXIDE
MICROORGANISMS
OXYGEN COMPOUNDS
OZONE
PARASITES
PEROXIDES
QUALITY CONTROL
RADICALS
SYNTHESIS
TOXICITY
VIRUSES
WATER SUPPLY