A novel nonoxidizing biocide for cooling water systems
- Lonza Inc., Annandale, NJ (United States)
Quaternary ammonium biocides are commonly used in cooling water systems to control organisms associated with microbiologically induced corrosion and microbial fouling. These compounds while being highly efficacious and low cost have, in general, high foaming tendencies which can limit their range of application. A new quaternary ammonium compound, decylisononyldimethylammonium chloride (DIDMAC), was developed to prevent foam problems while maintaining the advantages of standard quat treatments. Laboratory evaluations showed DIDMAC to produce significantly less foam than a standard alkyldimethylbenzylammonium chloride (ADBAC), approaching that of a polymeric quat. Bactericidal and algicidal evaluations showed DIDMAC to provide efficacy greater than the polymeric quat and similar to the ADBAC. Field evaluations confirmed the laboratory results showing DIDMAC to foam significantly less than the ADBAC and similar to the polymeric quat. In the field, DIDMAC bactericidal and algicidal efficacies were evaluated in combination with other nonoxidizing biocides. Optimized programs, consisting of weekly additions of 10--30 mg/l DIDMAC with semiweekly applications of 1.5 mg/l isothiazolone, exceeded the algicidal and matched the bactericidal performance of control thione/isothiazolone programs. The DIDMAC-containing programs, in addition to providing enhanced bactericidal and algicidal efficacy, reduced treatment costs by 27 to 43% compared to the control.
- OSTI ID:
- 82975
- Report Number(s):
- CONF-940222-; TRN: IM9533%%433
- Resource Relation:
- Conference: Corrosion 94: National Association of Corrosion Engineers (NACE) international annual conference, Baltimore, MD (United States), 28 Feb - 4 Mar 1994; Other Information: PBD: 1994; Related Information: Is Part Of Corrosion/94 conference papers; PB: 5005 p.
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
20 FOSSIL-FUELED POWER PLANTS
COOLING SYSTEMS
WATER TREATMENT
FUNGICIDES
PERFORMANCE
BIOLOGICAL FOULING
MITIGATION
AMMONIUM CHLORIDES
BACTERIA
ALGAE
ECONOMICS
INDUSTRIAL PLANTS
ELECTRIC UTILITIES
FIELD TESTS
WATER CHEMISTRY
EXPERIMENTAL DATA