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Oxidizing Biocide with function of slime prevention & removal Jan 2013 Acculab.

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Presentation on theme: "Oxidizing Biocide with function of slime prevention & removal Jan 2013 Acculab."— Presentation transcript:

1 Oxidizing Biocide with function of slime prevention & removal Jan 2013 Acculab

2 ☞ Free HOBr generation mechanism of Justeq07 NaOCl + Stabilizer HOBr Bacteria NaBr - Steady conversion of Stabilized Chlorine and Bromide to free HOBr in process waters - Oxidation of bromide only occurs in situ (pH 5-9) Stabilized chlorine + Br - → HOBr

3 Justeq 07 Oxidizing (NaOCl) Non- oxidizing Remark (A)Air/water pollution No 5~20% emission of input amount (at pH 8.0~8.5) No Justeq 07: Odor free (Suitable for factories in the urban areas) AOX ~2/100 less than NaOCl (B) Bio-fouling Excellen t PoorGood ① Justeq 07: prevent biofilm formation at 2 nd stage & remove aged bio-film within about 1 month ② increment of U value: energy saving (C) Resistance ( against microbes) No Yes ① Mists of non-oxidized biocide solutions have risk of skin irritation & other sensitive issues (Humidifier disinfectant) ② Non-oxidizing biocides are generally using in the paper mill Biocides for Cooling Water General biocide usage of standard cooling tower NaOCl solution (~12%) is used as oxidizing biocide for cooling water. In order to complement NaOCl, non-oxidizing biocide may be used every two week. Justeq 07: stabilized chlorine/bromide ion

4 (A-1) Chlorine emission: Hypohalous acid and haloamine flashoff in industrial evaporative cooling systems

5 (A-1-1) Speciation of Cl 2, HOCl and OCl - as a function of pH

6 (A-1-2) The speciation as a function of pH using values for K1 = 3.9x10 -4 & K2= 2.9x10 -8 at 25 ℃

7 (A-2) Case studies : Amounts of hypochlorous acid flushoff by using standard cooling water systems at pH 8.5 Spec of standard cooling water system Biocides Input (ppm) Amount (Kg)/month Amount of NaOCl flushoff (Kg)/month Remark RR ㎥ /hr 10,000NaOCl (ppm/RR) 17,200720 Not good due to the formation of slime δTδT ℃ 5 Non-oxidized (ppm/HV/week) EV ㎥ /hr 86.2NaOCl (ppm/RR) 1 7,200720 Use non-oxidizing biocide to prevent & reduce the slime growth COC7 Non-oxidized (ppm/HV/3 month) 100600 TBD ㎥ /hr 14.4 Justeq 07 (ppm/HV/day) 301,800 - No emission. Amount of biocide depends on water quality HV ㎥ 2,000 Justeq 07 (ppm/HV/day) 402,400 - ☞ Total usage of halogen can be reduced up to 1/5~1/10

8 (A-3) Relative AOX formation in cooling tower by halogen biocides NaOCl (Un-stabilized chlorine) Stabilized bromine Justeq 07 (Stabilized chlorine) Remark 100 %50%~20% Based on the chorine consumption rate 100%40%~10% Relative AOX formation at same halogen conc (USP 5,683,654 table II) 100%20%~2% Final relative AOX formation by Justeq07 AOX: Absorbable Organic Halides: For environmental protection reasons, the AOX value must be monitored at all times. A cooling cycle operating with Justeq07 shows much lower AOX values than a cycle operated with chlorine or bromine

9 (B-1) Steps in biofilm development 1) Surface conditioning - Almost immediately a organic layer deposits on the water/solid interface - Conditioning layers neutralize excessive surface charge & surface free energy -The absorbed organic molecules often serve as a nutrient source for bacteria 2) Adhesion of pioneer bacteria -Some of the planktonic (free-floating) bacteria will approach the wall & become entrained within the boundary layer -Initial attachment is based on electrostatic attraction & physical force -Some of the reversibly adsorbed cells become irreversibly adsorbed. -Stabilized chlorine/ bromide ion works in stage 2 ☞ No adhesion or removal of pioneer bacteria by killing planktonic microorganism or hindering bacteria attachment

10 3) Slime formation - Adsorbed bacteria excrete extracellular substance - These polymeric substance, or glycocalyx, consists of charged & neutral polysaccharides groups - These substance facilitate attachment & act as an ion-exchange system for trapping & concentrating trace nutrients - In a mature biofilm, more of the volume is occupied by the loosely organized glycocalyx matrix (75~95%) than by bacteria cells (5~25%) 4) Secondary colonizers - As well as trapping nutrient molecules, the glycocalyx net also snares other types of microbial cells through physical restraint and electrostatic interaction -These secondary colonizers metabolize waste from the primary colonizer as well as produce their own waste which other cell then use in turn

11 5) Fully functioning biofilm -The mature, fully functioning biofilm is like a living tissue on the wall surface Mature biofim are imaginatively described in the article “Slime City” -As stabilized chlorine & bromide ion has outstanding penetration properties it overcomes the protective barrier of the aged bio-film and then disintegrate. HOBr by reaction of stabilized chlorine & bromide ion detach the slime structures in addition to the biocidal effect.

12 penetration time (min.) chloride ion5 chlorosulfamate6 hypochlorite48 The mean penetration time into ~1mm thick biofilm P.S.Stewart et al. Center for Biofilm Engineering and Department of Chemical Engineering, Montana State University Journal of Applied Microbiology 2001,91,525- 532 (B-2) Penetration rate of chlorine-based biocides into biofilm

13 (B-3) Increment of U (overall heat transfer coefficient for condenser) by biofilm Biofilm thickness ( ㎛ ) U (Btu/ft 2 *hr* ℉ ) ☞ Additional surface area (%) 08700 10051071 12046986 243318174 ☞ Additional surface area required for compensating water side biofouling

14 (B-4) Easier cleaning: reduce the cleaning effort - Cleaning works may be hazardous to health w/o the use of protective equipment (dispersed & inhaled germ aerosols, legionella, sick building syndrome, etc)

15 (B-5) Fountain Application (Everland Youngin Korea) ⇒ ⇒ w/o biocide with Justeq 07 after 1 week No odor

16 (C-1) Mechanism of action of industrial biocide Biocide Electrophiles Membrane active OxidantElectrophiles ProtonophoresLytic Chlorine Bromine Ozone Peroxides Isothiazolones Aldehydes Carbamates DBNPA BNPD Quats Biguanides Phenols Alchols Week acids Parabens Pyrithiones Humidifier disinfectant: PHMG, PGH, CMIT/MIT, DBNPA: 2,2-dibromo-2-cyanoacetamide BNPD: 2-bromo-2-nitropropane-1,3-diol Technical brochure of PPChem The mechanism of action of Isothiazolone Biocides Terry M. Williams

17 (C-2) Humidifier Disinfectants

18 Methylisothiazolinone, A Neurotoxic Biocide, Disrupts the Association of Src Family Tyrosine Kinases with Focal Adhesion Kinase in Developing Cortical Neurons 1.Journal of Pharmacology and Experimental Published online before print March 17, 2006, doi: 10.1124/jpet.106.103044 JPET June 2006 vol. 317 no. 3 1320-1329 Dr. Elias Aizenman, Department of Neurobiology, University of Pittsburgh School of Medicine; E1456 BST, Pittsburgh, PA 15261. E-mail: 2. From Wikipedia, the free encyclopedia: Key word (methylisothiazolinone) 1.MIT(methylisothiazolinone) and its closely related analog, chloromethylisothiazolineone or CMIT, affect the ability of young or developing neurons to grow processes (axons and dendrites) in tissue culture 2. The toxic actions of MIT on developing neurons occurs at much lower concentrations than those inducing lethal injury (1-3 micromolar). CMIT is even more potent, working at concentrations as low as 0.1 micromolar ☞ One micromolar is approximately 0.115 parts per million. (C-3) Toxicities of MIT & CMIT

19 (C-4) Physico-Chemical Properties of Sodium hypochlorite solution Melting Point: -6°C (21 deg F) (5% solution) Boiling Point: Decomposes above 40°C (104 deg F) pH value: Approx. 11 Odour chlorine (bleach) odour Odour Threshold: Not applicable. Odour is due to breakdown products such as chlorine. Stability: Sodium hypochlorite solution decomposes slowly. Decomposition is speeded up by heat (temperatures above 40 deg C) and light. Hazardous Decomposition Products: Chlorine, oxygen, sodium chlorate.

20 Corrosion: Test results of Metal corrosion (40 ℃ ) ① de-ionized water ② stabilized chlorine/bromide ion : 100 ppm ③ 12% NaOCl : 60ppm ④ competitor : 40ppm + NaOCl : 60ppm Nail 1dayBrass 3 daysSus 304 1 month ① ② ③ ④① ② ③ ④ ① ② ③ ④① ② ③ ④ ① ② ③ ④① ② ③ ④ interface Due to corrosive gas, corrosion occur above interface of ③ & ④

21 Certification 1 : U.S.A - EPA Reg #: 84024-1 (Oct 18 2007) California EPA Reg (May 25, 2012) ※ Justeq 07: Brand name in U.S.A

22 Certification 2 : Japan (Dec 22 2011) ☞ Chromosomal aberration test ※ Ecocide 100: Brand name in Japan -

23 Certification 3 : Japan (Sept 3 2010) - 微生物を用いる變異原性試驗 (Ames 試 驗 ) ※ Ecocide 100: Brand name in Japan

24 #Registered Product NameDistributor Name 1Cite 8570Cite corporation 2Biotrol 409U.s. water services 3Alg-715Aquatech 4Qwt 2133Quality water treatment, inc. 57407Power engineering co. 6Mitco cc-7l microbiocideMitco inc 7Justeq07R2j chemical services 8Cwt 2190Masters chemical co inc 9Busan 1735Buckman laboratories inc. 10American #818 industrial microbiocideAmerican water treatment inc 11United 339 cycle smart stabilized bromine treatmentUnited laboratories, inc. 12A-207Chemco products inc. 13Ml-719Gehrke technology group 14Jbc 22 biocideJentek water treatment, inc. 15Cesco act 2020Cesco solutions, inc. 16Aq4113Aqualine water treatment products inc 17Waterchem 2030Water chemical service, inc. 18Al-7015Barclay water management inc 19Oxy-bromWalling water management 20Justeq07Chemtreat inc 21Mg-3610Algoma products inc. 22Justeq07Pacific standard specialties ☞ U.S.EPA Reg No. : 84024-1 Manufactureer Name: Justeq LLC ☞ : Source ToxList=&ChooseSearchType=Begin&select2=&ProdTox=&ProdName=&NameType=Both&ProdRegYear=&ChemRegList=&ProdUseList=Bacterio cide&ChemToxBool=Is&offset=4000 Sub-registration in U.S.A

25 Summery of Justeq 07 1)Excellent biofilm penetration 2)Not be consumed by the EPS(exo polysaccharides) contained in the slime layer NaOCl(strong oxidizer) react and are consumed by EPS 3)Penetrate to kill the bacteria within the slime layer, leading to removal of existing slime deposits 4)Easy installation of supply systems (Pump & tank) 5)Protect the operating personnel - No damage by Justeq 07 (no chemical burning & skin irritation)

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