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Non-Oxidizing Biocides
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Order Number
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Title
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Author
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Date
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Evolution of Non-Polluting Microbicides (TP-131A)
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Ronald A. Schultz, Wright Chemical Corp.
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1974
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Abstract:
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Temperature and pH Hydrolysis of 2,2 Dibromo-3-Nitrilopropionamine (TP-262A)
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Amanda K. Meitz & Lawrence B. Magnusson, The Mogul Corp.
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1983
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Abstract:
As National Pollution Discharge Elimination System (NPDES)
discharge requirements become increasingly more stringent a
biocide that decomposes prior to discharge may become one of the
few suitable methods for controlling microbes in cooling water
systems. The pH and temperature dependent hydrolysis
dibromonitriloproprionamide (DBNPA) was studied over a range of
temperatures and pHs (7-8.5) expected for modern cooling water
systems. A method for calculating time required for DBNPA
decomposition using temperature and pH data for any cooling
system is proposed.
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Evaluation of Industrial Biocides in Laboratory Model Cooling Towers (TP-86-17)
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W.F. McCoy & E.S. Lashen, Rohm & Haas Company
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1986
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Abstract:
Cooling tower models were used to simulate industrial conditions
and evaluate the efficacy of commercially available biocides
against adherent (sessile) populations of microorganisms. The
cooling tower parameters that were controlled included
temperature, pH, cycles of concentration, blowdown rate,
recirculation rate and lighting. The treatment programs were
evaluated on the basis of viable cell counts, biochemical
monitors, scanning electron microscopy and visual observations.
Evaluations of biocide treatment programs are made by monitoring
the microbial cells (algal, bacterial and funal) in the biofilms
that develop on cooling tower slats. The treatments that were
successful in maintaining biological control of biofilms in
model cooling towers corresponded to commonly recommended
programs used in industrial systems. Thus, the model cooling
towers offer a relatively simple and meaningful method for
evaluating cooling tower biocides in a realistic lab test.
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Tris (Hydroxymethyl) Nitromethane: An Evaluation of a Versatile Cooling Water Treatment Microbiocide (TP-90-06)
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Kenneth Soeder, Jamestown Chemical Co., Dr. Frederick J. Passman, Angus Chemical Co.
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1990
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Abstract:
During the past decade, a compendium of new environmental
regulations, health and safety concerns, performance objectives
and economic consideration have curtailed the use of many
microbiocides in cooling water treatment applications. In light
of these developments, the primary objective of this paper will
be to evaluate the use of Tris (Hydroxymenthyl) Nitromethane
(TN), a product only recently introduced to the cooling water
marketplace, as a versatile microbiocide suitable for use in
many diverse treatment applications. In paper, both laboratory
and field data will be presented demonstrating the product's
broad-spectrum efficacy, especially in the high pH environments
common to many of today's cooling water systems. In formation
concerning additional product benefits, such as the fact that TN
is non-foaming and non-odorous, will not react with other
treatments or system contaminants, is environmentally and
hygienically-sound and extremely cost-effective, will also be
presented.
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A New Bromine Oxidizing/Nonoxidizing Antimicrobial Combination Product for Industrial Water Treatment (TP-90-14)
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C.R. Ascolese, Betz Industrial
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1990
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Abstract:
In certain water-cooling systems, continuous low-level
application of oxidizing antimicrobials will not provide
year-round control of algal biofilms in cooling towers.
Therefore, these treatment s are often supplemented with
periodic additions of non-oxidizing, antimicrobials, especially
to control seasonal algal biofilms. This report describes a
solid combination product that will deliver both oxidizing
halogen (BCDMH: bromochlorodimethylhydantonin) and algicide
(Simazine: 2-chloro 4, 6-bis (ethylamino) -s-triazine)
simultaneously. Results are reported from several field trials
in industrial cooling-water systems using the same feeding
equipment as for Betz Slimicides C-77P (tableted BCDMH) and
C-78P (granular BCDMH). The combination products are highly
effective, easy to use, and safe. Results of the field trials
establish efficacy of the treatment and define relevant
application parameters. A guide for successful application is
provided.
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Biocide Efficacy vs. Acid Producing and Iron Oxidizing Bacteria (TP-92-13)
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Lawrence A. Grab, Union Carbide Chemical and Plastics, Leonard A. Rossmoore, Biosan
Laboratories, Inc.
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1992
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Abstract:
Procedures have been developed for the successful evaluation of
four water treatment biocides versus the acid-producing bacteria
Thiobacillus novellas and the iron oxidizing bacteria Leptotrhix
discophoro, Hyphomicrobium indicium and Sphaerotilis natans. The
evaluations were conducted at pH 7.0 and ambient temperature.
Each biocide was tested at concentrations that represent
recommended treatment dosages for industrial water systems. The
Biocidal efficacy was evaluated after a 1, 4, and 7-hour contact
time with the organisms. All of the biocides proved to be highly
effective against L. discophora, whereas efficacy against T.
novellas, H. indicium and S. natans varied.
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The Devil You Know Versus The Devil You Don't - An Evaluation of Chlorine Versus a Non-Oxidizing Biocide for Zebra Mussel Control
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Patrick H. Gill & Alan L. Smith Calgon Corporation
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1995
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Abstract:
When evaluating options for control of impending infestation of
Zebra mussels, all too often decisions are made solely based on
using chemistry historically added for general biological
control. Is this the right treatment? This paper reviews the
option of a non-oxidizing biocide in direct comparison to
chlorine in zebra mussel control applications.
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