A novel nonoxidizing biocide for cooling water systems

Book · Sat Dec 31 04:00:00 EST 1994

OSTI ID:82975

Sweeny, P G; Himpler, F J ^[1]

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1. 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--
• Country of Publication: United States
• Language: English

Related Subjects

20 FOSSIL-FUELED POWER PLANTS
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
36 MATERIALS SCIENCE
ALGAE
AMMONIUM CHLORIDES
BACTERIA
BIOLOGICAL FOULING
COOLING SYSTEMS
ECONOMICS
ELECTRIC UTILITIES
EXPERIMENTAL DATA
FIELD TESTS
FUNGICIDES
INDUSTRIAL PLANTS
MITIGATION
PERFORMANCE
WATER CHEMISTRY
WATER TREATMENT