|
Use of Biocides
|
|
Order Number
|
Title
|
Author
|
Date
|
|
|
Combating Biological Attack on the Gulf Coast (TP-4A)
|
C.D. Carlson, Dow Chemical Company, U.S.A.
|
1963
|
|
Abstract:
|
|
|
Fungus Control in Cooling Towers (TP-6B)
|
C.W. Brown, Betz Laboratories, Inc.
|
1964
|
|
Abstract:
|
|
|
The Growth and Control of Nitrifying Bacteria in a Urea Plant Cooling (TP-87-15)
|
S.P. Holmes, Petrolite Corporation
|
1987
|
|
Abstract:
A urea plant cooling water system experienced problems with the
growth of nitrifying bacteria which produced nitric acid from
ammonia resulting in a sharp drop in the pH of the cooling water
was found to drop from 7.5 to 6.1 over a period of 34 days. It
was demonstrated in the laboratory that bacteria possessing the
enzyme urease were present in the cooling water. A number of
biocides were screened for their ability to inhibit growth of
ammonia-oxidizing bacteria in both a mineral salts medium and
the cooling water in a series of laboratory tests.
|
|
|
A New Biocide for Control of Algal Biofouling in Cooling Towers
|
K. Mark Wiencek, Terry M. Williams, Robert F. Semet, Rohm and Haas Company
|
1998
|
|
Abstract:
A new, environmentally friendly isothiazolone biocide has been
developed. The new biocide, which recently won a "Green
Chemistry" award, is highly effective in controlling the growth
of algae in cooling water. Laboratory tests demonstrate
broad-spectrum algicidal properties against a range of green
algae and blue-green bacteria (cyanobacteria). Field trials,
conducted in several regions, confirmed the efficacy of the new
biocide at low use levels. The new biocide is fast-acting and
controls algal grow thin recirculating cooling water as well as
algal biofilms on tower decks.
|
|
|
Unique Biodispersant Removes Biofilms and Increases Biocides Efficacy
|
Melvin H. Czechowski & Kurt W. Whitekettle, BetzDearborn Inc.
|
1999
|
|
Abstract:
Bacteria in Cooling Water systems must be controlled because
bacteria attach to surfaces, forming biofilms that inhibit heat
transfer, block fluid flow, promote corrosion, etc. Control is
obtained mainly by use of biocides. However, to be effective
against biofilm-forming bacteria, biocides must be used in high
concentrations; however, control is often marginal. In addition,
high biocide concentrations may increase toxicity in water in
some instances and could result in discharge problems. Data is
presented on a unique, adjuvant material that increases the
efficacy of oxidizing and non-oxidizing biocides against
bacteria both in biofilms and in cooling water, and that also
helps remove slime/biofilm form surfaces.
|
