CA1069015A - Enzymatic dispersion of biological slimes - Google Patents
Enzymatic dispersion of biological slimesInfo
- Publication number
- CA1069015A CA1069015A CA291,955A CA291955A CA1069015A CA 1069015 A CA1069015 A CA 1069015A CA 291955 A CA291955 A CA 291955A CA 1069015 A CA1069015 A CA 1069015A
- Authority
- CA
- Canada
- Prior art keywords
- waters
- slimes
- industrial process
- ppm
- water
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/50—Treatment of water, waste water, or sewage by addition or application of a germicide or by oligodynamic treatment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
- C02F5/08—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents
- C02F5/10—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents using organic substances
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Enzymes And Modification Thereof (AREA)
- Agricultural Chemicals And Associated Chemicals (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
Slime in industrial process waters can be dispersed and prevented by treating the waters with a few ppm of the enzyme, Rhozyme HP-150, a pentosanase-hexasanase.
Slime in industrial process waters can be dispersed and prevented by treating the waters with a few ppm of the enzyme, Rhozyme HP-150, a pentosanase-hexasanase.
Description
3~
I NTRODUCTI ON
_ ~_ Industrial process waters such as are used in industrial cooling towers and paper mill systems often contain large quanti~ies of slime which, if uncontrolled, form undesirable deposits on the surfaces in contact with these wat~rs. In the case o~ industrial cool.ing tower~, slimes can deposit on heat transfer surfaces and substantially reduce heat transfer efficiencyr In paper mills, slime formati~n can interfer2 with sheet production and cause undêsirable inclusions in finished paper products.
A cornmon method of preventing these slime5 which are primax~
ily of biological origin ha~ ~een to treat the aqueous systems wherein these slimes are formed with biocide5. It ~as been ~ound, however, that biocides are not entirely effective. In other instances, ~iocides are too toxic to be used where there i5 a chance they might come in contact with ~uman beings or w~uld con-tarninate products such as food grade pap~r products.
A recently proposed method for controlling slime fonmation in paper mills has ~een the trea-hnent of paper mill waters with the enzyrne, levan hydrolase. This approach to slime control i5 found in U.S. 3r773~623.
THE INVE~ION
In accordance with the invention, it has been found that biological sllmes associated with industrial process waters may be dispersed and prevented rom depositing on solid surfaces in contact with such waters by treating such waters with at least 3 ppl~
o~ the enzyme, Rhozyme HP-150, a pentosanase-hexosanase. The in~en-tion is particulaxly effective ln treating industrial waters used in the operation of cooling ~owers to disperse slimes and slirne-forming rnasses within such waters to prevent the deposit of such
I NTRODUCTI ON
_ ~_ Industrial process waters such as are used in industrial cooling towers and paper mill systems often contain large quanti~ies of slime which, if uncontrolled, form undesirable deposits on the surfaces in contact with these wat~rs. In the case o~ industrial cool.ing tower~, slimes can deposit on heat transfer surfaces and substantially reduce heat transfer efficiencyr In paper mills, slime formati~n can interfer2 with sheet production and cause undêsirable inclusions in finished paper products.
A cornmon method of preventing these slime5 which are primax~
ily of biological origin ha~ ~een to treat the aqueous systems wherein these slimes are formed with biocide5. It ~as been ~ound, however, that biocides are not entirely effective. In other instances, ~iocides are too toxic to be used where there i5 a chance they might come in contact with ~uman beings or w~uld con-tarninate products such as food grade pap~r products.
A recently proposed method for controlling slime fonmation in paper mills has ~een the trea-hnent of paper mill waters with the enzyrne, levan hydrolase. This approach to slime control i5 found in U.S. 3r773~623.
THE INVE~ION
In accordance with the invention, it has been found that biological sllmes associated with industrial process waters may be dispersed and prevented rom depositing on solid surfaces in contact with such waters by treating such waters with at least 3 ppl~
o~ the enzyme, Rhozyme HP-150, a pentosanase-hexosanase. The in~en-tion is particulaxly effective ln treating industrial waters used in the operation of cooling ~owers to disperse slimes and slirne-forming rnasses within such waters to prevent the deposit of such
-2-~1 ( ¦. slimes on the heat e~ch~ge surfaces of cooling towers ana other ¦ sur:Eaces ~ssociated w:ith such units.
In a preferred embodiment of the invention, Rhoz~me ~IP-150*, ; . ~ pentosanase-hexasanase~ is employed at a dosage rate varying between S - 100 ppm.
To determine the ef~iciency o various materials to disper~
existing biologically pxoduced slimes, a laboratory scale forced ¦ ~raft single cell cooling tower was used~ The basic characteristic ¦ o~ this cooling tower and the envircnment are sek forth below-.
: Process Cooled: Experimental Heat ¦ Exchanger Tubes Total Capacit~: 20 liters .
¦ Recirculation Rate: 2 ~allons per mi~ute Blowdown Rate: 70 C.~. per minute : Make~up Water:- Chicago Tap Water ~T 4C~
Concentra~ion: 3 ~; pH Tower Water: 8.5 ~ardness: 435 ppm tas calcium carbonate . ¦ T~mperature: 100F~
. Make-up Water: 12 gallon5 per 24 hours To the towar ma~eup water was added 5~ ppm each of ethy.lene glycol and a source of organi.c phosphorus in the form of a phospha~
ester. The tower was allowed to run without biological control ~o.r da~s, whi.ch caused the substantial formation o~ slime masses ~n the m.etallic heat e~change surfaces~
10 ppm of the particular chemical to be tested was added ~o the water o.~ the tower and allowed to circulate for 1 hour. ~ the _ _ *Rhozyme is a trademark o~ Rohm and ~aas Co., Philadelphia, Pa.
. . -3-`; ( 11169~J15 ¦ ~nd o~ that period of time, a ~io mass assay was made of the bas~n ¦ ~ater ~lsing a duPont biometer, which is described in the duPont -publication entitled, duPont _O Luminescence Biometer, December, 1970. It is aiso described in U.S. 3,359,973. .
Th esults o~ these tests are set forth in Table I.
. .
.
~; ' _~,,_ ., ..
~69(115 .
- TABLE I
Enzyma Biodispersanc~ - 10 ppm~l Hour Contact -Biometer Data Enzyme ~ Bio~ass Change : 1. Lysozyme 65.3%
; 2. Rhoz~me HP-150* 64.8%
. 3. Amylase 26.8~
.
. * ~hozyme HP-150 was the only enzyme tested not contributin~ significant microbiological population with inoculum~. .
. ~
' ~ ' ' .
. ~ .
' ~, o~i9VlS
Havi.n~ thus descri~-e~ ~ux ;.n~ention, it is claimed as foll~ws: .
. . . .
In a preferred embodiment of the invention, Rhoz~me ~IP-150*, ; . ~ pentosanase-hexasanase~ is employed at a dosage rate varying between S - 100 ppm.
To determine the ef~iciency o various materials to disper~
existing biologically pxoduced slimes, a laboratory scale forced ¦ ~raft single cell cooling tower was used~ The basic characteristic ¦ o~ this cooling tower and the envircnment are sek forth below-.
: Process Cooled: Experimental Heat ¦ Exchanger Tubes Total Capacit~: 20 liters .
¦ Recirculation Rate: 2 ~allons per mi~ute Blowdown Rate: 70 C.~. per minute : Make~up Water:- Chicago Tap Water ~T 4C~
Concentra~ion: 3 ~; pH Tower Water: 8.5 ~ardness: 435 ppm tas calcium carbonate . ¦ T~mperature: 100F~
. Make-up Water: 12 gallon5 per 24 hours To the towar ma~eup water was added 5~ ppm each of ethy.lene glycol and a source of organi.c phosphorus in the form of a phospha~
ester. The tower was allowed to run without biological control ~o.r da~s, whi.ch caused the substantial formation o~ slime masses ~n the m.etallic heat e~change surfaces~
10 ppm of the particular chemical to be tested was added ~o the water o.~ the tower and allowed to circulate for 1 hour. ~ the _ _ *Rhozyme is a trademark o~ Rohm and ~aas Co., Philadelphia, Pa.
. . -3-`; ( 11169~J15 ¦ ~nd o~ that period of time, a ~io mass assay was made of the bas~n ¦ ~ater ~lsing a duPont biometer, which is described in the duPont -publication entitled, duPont _O Luminescence Biometer, December, 1970. It is aiso described in U.S. 3,359,973. .
Th esults o~ these tests are set forth in Table I.
. .
.
~; ' _~,,_ ., ..
~69(115 .
- TABLE I
Enzyma Biodispersanc~ - 10 ppm~l Hour Contact -Biometer Data Enzyme ~ Bio~ass Change : 1. Lysozyme 65.3%
; 2. Rhoz~me HP-150* 64.8%
. 3. Amylase 26.8~
.
. * ~hozyme HP-150 was the only enzyme tested not contributin~ significant microbiological population with inoculum~. .
. ~
' ~ ' ' .
. ~ .
' ~, o~i9VlS
Havi.n~ thus descri~-e~ ~ux ;.n~ention, it is claimed as foll~ws: .
. . . .
Claims (2)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A method for preventing slimes from being deposited on solid surfaces in contact with industrial process waters which comprises treating these waters with at least 3 ppm of a pentosanase-hexasanase enzyme obtainable under the trade mark "Rhozyme HP-150".
2. The method of Claim 1 where the industrial process water is a cooling tower water.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US05/752,226 US4055467A (en) | 1976-12-20 | 1976-12-20 | Enzymatic dispersion of biological slimes |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1069015A true CA1069015A (en) | 1980-01-01 |
Family
ID=25025426
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA291,955A Expired CA1069015A (en) | 1976-12-20 | 1977-11-29 | Enzymatic dispersion of biological slimes |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US4055467A (en) |
| CA (1) | CA1069015A (en) |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4684469A (en) * | 1983-05-17 | 1987-08-04 | Ecolab Inc. | Two component biocidal process |
| US4626286A (en) * | 1983-10-31 | 1986-12-02 | Schmid Laboratories, Inc. | Collagen gel and the process of making said gel |
| JPS61501153A (en) * | 1983-10-31 | 1986-06-12 | シユミツト ラボラトリ−ズ インコ−ポレ−テツド | Collagen gel manufacturing method and membrane products manufactured from it |
| JPS60159596A (en) * | 1984-01-30 | 1985-08-21 | Agency Of Ind Science & Technol | Prevention of stain by living organism |
| US5998200A (en) * | 1985-06-14 | 1999-12-07 | Duke University | Anti-fouling methods using enzyme coatings |
| FI75973C (en) * | 1986-12-12 | 1988-09-09 | Kemira Oy | FOERFARANDE FOER ELIMINERING AV MIKROBER I PROCESSVATTEN AV PAPPERSFABRIKER. |
| US4936994A (en) * | 1989-03-13 | 1990-06-26 | Nalco Chemical Company | Application of cellulase to control industrial slime |
| US5071765A (en) * | 1989-03-13 | 1991-12-10 | Nalco Chemical Company | Application of multiple enzyme blend to control industrial slime on equipment surfaces |
| FI88246C (en) * | 1989-10-27 | 1993-04-26 | Genencor Int Europ | Procedures for controlling microorganisms |
| DE69203992T2 (en) * | 1991-02-12 | 1996-03-21 | Buckman Labor Inc | COMPOSITION AND METHOD FOR REMOVING OR AVOIDING BIOBAGAGE. |
| US5238572A (en) * | 1993-01-25 | 1993-08-24 | Betz Laboratories, Inc. | Enzyme treatment for industrial slime control |
| US6342386B1 (en) | 1996-10-29 | 2002-01-29 | Warren Paul Powers | Methods for removing undesired growth from a surface |
| US5919689A (en) * | 1996-10-29 | 1999-07-06 | Selvig; Thomas Allan | Marine antifouling methods and compositions |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3773623A (en) * | 1972-02-25 | 1973-11-20 | Economics Lab | Slime control in industrial waters |
-
1976
- 1976-12-20 US US05/752,226 patent/US4055467A/en not_active Expired - Lifetime
-
1977
- 1977-11-29 CA CA291,955A patent/CA1069015A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| US4055467A (en) | 1977-10-25 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |