EP3020862A1 - Procédé de contrôle de boue - Google Patents

Procédé de contrôle de boue Download PDF

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Publication number
EP3020862A1
EP3020862A1 EP14822321.7A EP14822321A EP3020862A1 EP 3020862 A1 EP3020862 A1 EP 3020862A1 EP 14822321 A EP14822321 A EP 14822321A EP 3020862 A1 EP3020862 A1 EP 3020862A1
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EP
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Prior art keywords
white water
slime control
circulation line
water circulation
amount
Prior art date
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EP14822321.7A
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German (de)
English (en)
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EP3020862B1 (fr
EP3020862A4 (fr
Inventor
Hiroki Katsura
Hirotaka Ogasahara
Seikichi NINOMIYA
Hiroaki Yamamoto
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Kurita Water Industries Ltd
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Kurita Water Industries Ltd
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Priority claimed from JP2013144052A external-priority patent/JP5952230B2/ja
Priority claimed from JP2013144051A external-priority patent/JP6002095B2/ja
Application filed by Kurita Water Industries Ltd filed Critical Kurita Water Industries Ltd
Publication of EP3020862A1 publication Critical patent/EP3020862A1/fr
Publication of EP3020862A4 publication Critical patent/EP3020862A4/fr
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/02—Agents for preventing deposition on the paper mill equipment, e.g. pitch or slime control
    • D21H21/04—Slime-control agents
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/02—Agents for preventing deposition on the paper mill equipment, e.g. pitch or slime control

Definitions

  • the present invention relates to a slime control method in a white water circulation line in a paper making process.
  • paper is manufactured by paper making from a material slurry prepared by dispersing a pulp material in water.
  • a white water containing fine fibers and a filler is discharged from paper making machinery and the like.
  • the white water has been used through circulation in the paper making process in light of effective utilization and recycling of water resources, the white water contains organic substances such as starch, sizing agents, latex and casein in a large amount; therefore, a condition suited for propagation of microorganisms such as bacteria and fungi can be provided.
  • slime derived from the microorganisms is likely to be generated in a circulating water line, as well as on the surface of pipings and the equipment surface.
  • the slime leads to the deterioration of the quality of the product, and the production efficiency. Since the aforementioned fine fibers, starch and the like are concentrated in the white water circulation line during the operation, a part of the white water is discarded while fresh water is introduced thereinto. However, it is impossible to satisfactorily cope with the disadvantageous aspects described above by way of such an exchange of the white water.
  • an antimicrobial method was developed in which a slime control agent such as an organic antimicrobial agent is added to the white water circulation line (see Japanese Unexamined Patent Application, Publication No. 2003-164882 ).
  • a slime control agent such as an organic antimicrobial agent
  • the number of microorganism cells increases, and reductive substances such as hydrogen sulfide and mercaptan are generated in a large amount.
  • many of the slime control agents are oxidizing agents, these may react with sulfite ions derived from reductive substances prior to reacting with microorganisms, thereby leading to the consumption of a large quantity thereof is consumed before achieving a desired antimicrobial effect.
  • the slime control agent is also comparatively expensive, and thus providing a more efficient slime control method, and a reduction in the amount thereof used have been desired.
  • Patent Document 1 Japanese Unexamined Patent Application, Publication No. 2003-164882
  • the present invention was made in view of the foregoing disadvantages, and an object of the invention is to provide an efficient slime control method in a white water circulation line in a paper making process.
  • the present inventors have thoroughly investigated, and consequently found that the generation of slime can be efficiently controlled by: aerating a white water circulation line or a water feeding line for feeding water into the white water circulation line (hereinafter, may be also referred to as "water feeding line” or merely “water line”) with an oxygen-containing gas; and then adding a slime control agent to the white water circulation line or the water feeding line aerated with the oxygen-containing gas. Accordingly, the present invention was accomplished.
  • a slime control method in a white water circulation line in a paper making process includes the steps of: aerating with an oxygen-containing gas either one or both of the white water circulation line and the water feeding line for feeding water into the white water circulation line; and adding a slime control agent to at least one line of the white water circulation line and the water feeding line aerated with the oxygen-containing gas in the aerating step.
  • the slime control method enables a significant decrease to be attained in the amount of the slime control agent added to the line aerated with the oxygen-containing gas.
  • the basis for the advantage is presumed to result from lowering of the sulfite ion concentration in the white water circulation line, and the like, through oxidization of reductive substances by oxygen in the oxygen-containing gas, and a decrease in the solubility of the reductive substances such as hydrogen sulfide, which would result from dissolution of a large amount of the oxygen-containing gas in the white water circulation line.
  • the slime control method further includes the step of measuring at least one selected from the group of measurement items consisting of the oxidation reduction potential, the sulfite ion concentration and the amount of dissolved oxygen in the white water circulation line, and that the aeration rate in the aerating step and/or the amount of the slime control agent added in the adding step of the slime control agent is/are regulated, based on the measurement results obtained in the measurement step.
  • the aeration rate in the aerating step and/or the amount of the slime control agent added in the adding step of the slime control agent is/are regulated, based on the measurement results obtained in the measurement step.
  • the aeration rate in the aerating step and/or the amount of the slime control agent added in the adding step of the slime control agent are/is regulated such that in the white water circulation line: the oxidation reduction potential is no less than -150 mV; the sulfite ion concentration is no greater than 2.0 mg SO 3 - /L; and/or the amount of dissolved oxygen is no less than 1 mg/L.
  • the generation of the slime can be more effectively controlled by such an adjustment.
  • an aeration tank having a diffuser tube on the bottom thereof is used for the aerating in the aerating step, and that the aeration rate by the diffuser tube with respect to 1 m 2 of the unit bottom area of the aeration tank is no less than 0.5 m 3 /hour and no greater than 10 m 3 /hour.
  • an efficient slime control method in a white water circulation line in a paper making process can be provided.
  • a decrease in the amount of the slime control agent used is also enabled.
  • FIG. 1 shows a view illustrating one embodiment of the paper making process according to the present invention.
  • the slime control method is a slime control method in a white water circulation line in a paper making process, the method including the steps of: aerating with an oxygen-containing gas either one or both of the white water circulation line and a water feeding line for feeding water into the white water circulation line; and adding a slime control agent to at least one line of the white water from the circulation line and the water feeding line aerated with the oxygen-containing gas in the aerating step.
  • the slime control method further includes the step of measuring at least one selected from the group of measurement items consisting of the oxidation reduction potential, the sulfite ion concentration and the amount of dissolved oxygen in the white water circulation line.
  • the slime control method is used in the white water circulation line in the paper making process.
  • the term "white water” means an aqueous solution discharged in a large amount from paper making machinery and the like in a paper making process for paper manufacture.
  • the white water contains: fine fibers derived from a raw material pulp generally employed in paper making; other agent for paper manufacture; and the like.
  • the term “white water circulation line” as referred to means the stream line of the white water used through circulation in a paper making process.
  • water feeding line for feeding water into the white water circulation line as referred to means a water line for use in adjusting the concentration and the like of the pulp slurry and/or the white water in the white water circulation line.
  • the water line is not particularly limited, for example, soft water, hard water and the like for use in paper manufacture may be involved, and also a small amount of any agent for paper manufacture may be contained within a range not leading to impairment of the effects of the present invention.
  • the white water circulation line may pass via a solid-liquid separator, and the separated solid content may be either discharged out from the line, or recovered into the material system.
  • the raw material pulp used for the paper making is not particularly limited, and is exemplified by chemical pulps such as a hardwood (Laubholz) bleached Kraft pulp (LBKP), a softwood (Nadelholz) bleached Kraft pulp (NBKP), a Laubholz unbleached Kraft pulp (LUKP) and a Nadelholz unbleached Kraft pulp (NUKP), mechanical wood pulps such as a ground pulp (GP), a thermomechanical wood pulp (TMP), a chemithermomechanical wood pulp (CTMP) and a refiner mechanical wood pulp (RMP), waste paper pulps recycled from waste cardboard paper, waste liner paper, waste magazine paper, waste newspaper, waste chi-ken-shi paper, etc., a waste high-quality white paper pulp, a de-inked pulp, and the liked.
  • chemical pulps such as a hardwood (Laubholz) bleached Kraft pulp (LBKP), a softwood (Nadelholz) bleached Kraft pulp (NBKP), a Laubholz un
  • the agent for paper manufacture is not particularly limited, and for example, a surfactant, a wax, a sizing agent, a filler, a rust-preventive agent, a conductive agent, a defoaming agent, a dispersant, a viscosity adjusting agent, a flocculant, coagulant, a paper strength enhancer, a process yield improver, a paper dust detachment-preventing agent, bulking agent, and the like.
  • either one or both of the white water circulation line and the water line is aerated with an oxygen-containing gas.
  • an oxygen-containing gas By increasing the amount of oxygen in the white water circulation line, or maintaining the amount so as to exceed a certain level, a decrease in the amount of the slime control agent added in the paper making process, as well as efficient control of the generation of slime can be contemplated, as compared with the absence of the aerating step.
  • the water line is aerated with the oxygen-containing gas in this step, the generation of the slime in the entirety of the white water circulation line can be readily controlled as compared with a large amount of the white water in the white water circulation line, through efficiently aerating a comparatively small amount of the water line.
  • the reason for achieving the effects described above through aerating either one or both of the white water circulation line and the water line is not necessarily clarified, the reason may be presumed, for example, as in the following. Specifically, since many of the slime control agents serve as an oxidizing agent, these would react with the sulfite ions derived from reductive substances such as hydrogen sulfide from microorganisms, and mercaptan prior to reacting with the microorganisms, a large quantity of the slime control agent would be consumed before achieving a desired antimicrobial effect.
  • oxidization of the sulfite ions to give harmless sulfate ions, etc. is enabled by way of oxidization of the sulfite ions with oxygen in the oxygen-containing gas.
  • dissolution of a large amount of the oxygen-containing gas in the white water circulation line enables the partial pressure of the reductive substances such as hydrogen sulfide to be lowered, whereby the solubility of the reductive substances can be decreased.
  • the amount of the slime control agent added can be decreased while the sulfite ion concentration in the white water circulation line is lowered.
  • the generation of the slime can be efficiently controlled without need of an excess amount of the slime control agent.
  • the slime control agent added, it is also possible to control the change in color tone of the paper resulting from use of a large amount of the slime control agent, and negative influences on the paper quality involving e.g., deterioration of the dye. Furthermore, the whole area in the white water circulation line can be maintained clean during a continuous operation time period, thereby enabling the operation time period to be prolonged.
  • the aerating is carried out with the oxygen-containing gas.
  • the oxygen-containing gas is not particularly limited, and is exemplified by an oxygen gas alone, a gas mixture containing oxygen such as the air, and the like. Of these, in light of availability, the gas mixture is preferred, and the air is more preferred.
  • a gas other than oxygen in the gas mixture may be exemplified by a well-known gas such as nitrogen and carbon dioxide.
  • the oxygen-containing gas may be used either alone, or two or more types thereof may be used in combination.
  • the aerating procedure is not particularly limited as long as either one or both of the white water circulation line and the water line can be supplied with the oxygen-containing gas, and use of a diffuser tube, a stir or the like may be involved. Of these, since the aerating can be stably and continuously carried out, use of a diffuser tube is preferred. Specifically, finely bubbling upwards from the bottom so as to increase the contact efficiency between the white water or the water with the oxygen-containing gas enables the aerating to be more efficiently executed.
  • the diffuser tube is not particularly limited, and is exemplified by those provided with openings having a diameter of no less than 1 mm and no greater than 5 mm with each interval of no less than 5 cm and no greater than 50 cm, and the like. Either one, or a plurality of diffuser tubes may be used.
  • the place where the aerating is executed in the white water circulation line or in the water line is not particularly limited, and for example, the place may be in the piping, in the water channel, in the aeration tank, or the like.
  • the aeration tank is preferred, and use of an aeration tank having a diffuser tube on the bottom thereof is more preferred.
  • the shape of the aeration tank is not particularly limited, and the shape may be, for example, a box-shape, a cylindrical shape, an elliptic cylindrical shape, a cone-shape, or the like. Also, either only one, or a plurality of aeration tanks may be provided.
  • the aeration rate by the diffuser tube is not particularly limited, and the aeration rate with respect to 1 m 2 of the unit bottom area of the aeration tank is preferably no less than 0.5 m 3 /hour and no greater than 10 m 3 /hour, more preferably no less than 0.5 m 3 /hour and no greater than 8 m 3 /hour.
  • the white water circulation line or the water line aerated with the oxygen-containing gas tends to be sufficiently supplied with oxygen.
  • the aeration rate is greater than the upper limit, an equipment on a larger scale may be necessary.
  • the aeration rate is less than the lower limit, the aerating may be insufficient.
  • the aeration time period with the oxygen-containing gas is not particularly limited, and is typically no less than 3 min and no greater than 30 days, and preferably no less than 4 min and no greater than 20 days.
  • the white water circulation line or the water line aerated with the oxygen-containing gas tends to be sufficiently supplied with oxygen.
  • the aeration time period is greater than the upper limit, the manufacturing cost may increase.
  • the aeration rate is less than the lower limit, the aerating may be insufficient. Further, the aerating may be carried out either continuously, or several times intermittently.
  • an aeration tank having a diffuser tube on the bottom thereof is used in the aerating in the aerating step, with the aeration rate by the diffuser tube with respect to 1 m 2 of the unit bottom area of the aeration tank being no less than 0.5 m 3 /hour and no greater than 10 m 3 /hour.
  • the slime control agent is added to at least one line of the white water circulation line and the water line aerated with the oxygen-containing gas in the aerating step.
  • the number of bacteria in the white water circulation line can be further decreased as compared with the case in which the aerating is not carried out, and as a result, the generation of the slime can be further controlled.
  • the slime control agent also enables the degradation of organic substances such as starch contained in the white water to be inhibited, whereby the generation of the slime can be controlled.
  • the slime control agent is not particularly limited, and is exemplified by an organic antimicrobial agent, an inorganic antimicrobial agent, and the like.
  • the organic antimicrobial agent is not particularly limited, and examples of the organic antimicrobial agent include methylene bisthiocyanate, 5-chloro-2-methyl-4-isothiazolin-3-one, 2-methyl-4-isothiazolin-3-one, 4,5-dichloro-2-n-octylisothiazolin-3-one, 1,2-benzoisothiazolin-3-one, 2-n-octylisothiazolin-3-one, sodium dimethyldithiocarbamate, 2,2-dibromo-3-nitrilopropionamide, 2-bromo-2-bromomethylglutaronitrile, 2-bromo-2-nitropropane-1,3-diol, 2,2-dibromo-2-nitroethanol, 1,1-dibromo-1-nitro-2-propanol, 1,1-dibromo-1-nitro-2-acetoxyethane, 1,1-dibromo-1-nitro-2-acetoxypropane
  • R 1 represents a linear or branched alkyl group having 1 to 18 carbon atoms, and three R 1 s may be the same or different; and R 2 represents a linear or branched alkyl group having 8 to 18 carbon atoms, a benzyl group or a hydroxyethyl group.
  • 2,2-dibromo-3-nitrilopropionamide, and 2,2-dibromo-2-nitroethanol are preferred since a more superior antimicrobial effect is expected.
  • the inorganic antimicrobial agent is not particularly limited, and examples of the inorganic antimicrobial agent include hypochlorites such as sodium hypochlorite, potassium hypochlorite, calcium hypochlorite and barium hypochlorite, chlorine dioxide, chlorinated isocyanuric acid, a chlorine-bound compound, and the like.
  • hypochlorites such as sodium hypochlorite, potassium hypochlorite, calcium hypochlorite and barium hypochlorite, chlorine dioxide, chlorinated isocyanuric acid, a chlorine-bound compound, and the like.
  • sodium hypochlorite and a chlorine-bound compound are preferred due to having appropriate oxidizability, and having low reactivity with dissolved organic substances.
  • the chlorine-bound compound may be typically produced by reacting a chlorine donor that releases free chlorine with any one of ammonia, an ammonium salt and an organic nitrogen compound in an adequate condition.
  • the chlorine donor is not particularly limited, and for example, sodium hypochlorite may be used.
  • the ammonium salt include ammonium halides such as ammonium chloride and ammonium bromide, ammonium sulfate, ammonium nitrate, and the like.
  • the organic amine for example, sulfamic acid, urea or the like may be also used.
  • a compound which generates hypochlorous acid and/or hypobromous acid in water may be also acceptable, and examples of the compound include chlorine, chlorine dioxide, highly bleaching powder, hypochlorous acid, sodium hypochlorite, potassium hypochlorite, calcium hypochlorite, ammonium hypochlorite, magnesium hypochlorite, hypobromous acid, sodium hypobromite, potassium hypobromite, calcium hypobromite, ammonium hypobromite, magnesium hypobromite, chlorinated and/or brominated hydantoins, chlorinated and/or brominated isocyanuric acid, and sodium salts and potassium salts thereof, and the like.
  • chlorine-bound compound can be produced in accordance with a well-known process
  • "Fuzzicide (trade name)” manufactured by Kurita Water Industries Ltd.
  • “Fuzzicide” is a 1:1 reaction product (molar ratio) of ammonium bromide and sodium hypochlorite.
  • the slime control agent may be used either alone, or two or more types thereof may be used in combination. Also, the slime control agent may be added once, or may be divided into aliquots and added several times.
  • the adding procedure of the slime control agent to the white water circulation line or the water line is not particularly limited, and the slime control agent may be directly added, or the slime control agent may be dissolved or dispersed in a solvent for use as a solution or dispersion.
  • the solvent is not particularly limited, and is exemplified by water, an organic solvent, a mixed solvent thereof, and the like.
  • the organic solvent is not particularly limited, and examples of the organic solvent include:
  • water and diethylene glycol monomethyl ether are preferred since a more superior dispersibility and/or solubility can be ensured.
  • the concentration of the slime control agent in the solution is not particularly limited, and is typically no less than 1% by mass and no greater than 40% by mass, and preferably no less than 2% by mass and no greater than 30% by mass. When the concentration falls within this range, the slime control agent tends to be sufficiently dispersed or dissolved in the solvent. When the concentration is greater than the upper limit, the slime control agent can not be sufficiently dispersed or dissolved. When the concentration is less than the lower limit, the solvent may be required in a great amount.
  • the amount of the slime control agent added to the white water circulation line or the water line (the amount added to one of the white water circulation line and the water line when the slime control agent is added to both of the lines) is not particularly limited, and in terms of the solid content equivalent, the amount is typically no less than 0.1 mg/L and no greater than 1,000 mg/L, and preferably no less than 1 mg/L and no greater than 100 mg/L. When the amount falls within this range, the generation of the slime tends to be capable of being sufficiently controlled. When the amount is greater than the upper limit, the manufacturing cost may be increased. When the amount is less than the lower limit, controlling the generation of the slime may fail.
  • the time period from the start of the aerating treatment until the adding of the slime control agent is not particularly limited, and this time period is preferably no less than 0 min and no greater than 30 min.
  • this time period from the start of the aerating treatment until the adding of the slime control agent is greater than 30 min, the bacteria and the like are activated and propagated again, whereby reductive substances may increase.
  • FIG. 1 shows a view illustrating one embodiment of the paper making process according to the present invention.
  • Procedures of aerating with the oxygen-containing gas either one or both of the white water circulation line and the water line, and further adding the slime control agent to at least one line of the white water circulation line and the water line aerated with the oxygen-containing gas in the aerating step will be described below with references to specific examples. It is to be noted that in the following, a case in which the white water circulation line is aerated with the oxygen-containing gas, and the slime control agent is added to this white water circulation line (first method), and a case in which the water line is aerated with the oxygen-containing gas, and the slime control agent is added to this water line (second method) are each described.
  • a white water 10 is aerated with the oxygen-containing gas in an aeration tank 17 and/or the like.
  • a raw material pulp slurry in a machine tank 2 is mixed with the white water 10 from the aeration tank 17.
  • a slime control agent 18 and the like are added to the white water 10, and transferred to an inlet 5 via a screen 4 by way of a fan pump 3.
  • the raw material pulp slurry transferred to the inlet 5 is fed to a wire part 6 and is dewatered.
  • the dewatered wet sheet 7 is transferred from a press part 8 to a dryer part 9.
  • the white water 10 separated in the wire part 6 is reserved in a white water silo 11, and a part thereof is again charged into the aeration tank 17 and the like, followed by aerating in a similar manner to that described above.
  • a water line 19 for feeding into the white water circulation line 22 may be provided with an aeration tank 20 to carry out the aerating, and the slime control agent 21 may be added to the water line 19 (second aerating step, and second adding step of the slime control agent).
  • the procedures of the aerating and adding in the water line 19 are not particularly limited, and the aerating and the adding may be carried out in a similar manner to, for example, the aerating procedure and the adding procedure in the white water circulation line 22.
  • the water line 19 for feeding into the white water circulation line 22 is aerated with the oxygen-containing gas in an aeration tank 20 having a diffuser tube on the bottom thereof.
  • the slime control agent 21 is added to the aeration tank 20, and transferred to the inlet 5 via the screen 4 by way of the fan pump 3.
  • the raw material pulp slurry transferred to the inlet 5 is fed to the wire part 6 and is dewatered.
  • the dewatered wet sheet 7 is transferred from the press part 8 to the dryer part 9.
  • the white water 10 separated in the wire part 6 is reserved in the white water silo 11 to permit circulation of the white water 10.
  • the water line 19 is aerated with the oxygen-containing gas, and the slime control agent is added to this water line 19, aerating with the oxygen-containing gas, and/or the adding the slime control agent 18, etc., in the aeration tank 17 and the like are/is preferred.
  • step of aerating the white water circulation line 22 with the oxygen-containing gas is further included.
  • the generation of the slime can be further controlled synergistically.
  • step of adding a slime control agent to the white water circulation line 22 is further included.
  • the step of adding a slime control agent to the white water circulation line 22 is further included.
  • the procedures of the aerating and the adding in the white water circulation line 22 are not particularly limited, and the aerating and the adding may be carried out in a similar manner to, for example, the aerating procedure and the adding procedure in the water line 19.
  • the slime control method further includes the step of measuring at least one selected from the group of measurement items consisting of the oxidation reduction potential, the sulfite ion concentration and the amount of dissolved oxygen in the white water circulation line.
  • the aeration rate in the aerating step and/or the amount of the slime control agent added in the adding step of the slime control agent is adjusted such that in the white water circulation line: the oxidation reduction potential is no less than -150 mV; the sulfite ion concentration is no greater than 2.0 mg SO 3 - /L; and/or the amount of dissolved oxygen is no less than 1 mg/L.
  • the generation of the slime can be more effectively controlled by such an adjustment.
  • the oxidation reduction potential is adjusted to be preferably no less than -150 mV, and more preferably no less than -100 mV and no greater than 500 mV.
  • the oxidation reduction potential is likely to be lowered; however, when the oxidation reduction potential falls within the above range, the amount of oxygen in the white water circulation line would be sufficient, whereby the generation of the slime tends to be effectively controlled.
  • the oxidation reduction potential is greater than the upper limit, the amount of oxygen in the white water circulation line may be unnecessarily excessive.
  • the control of the generation of the slime may fail.
  • the measuring method of the oxidation reduction potential is not particularly limited, and is exemplified by potentiometry, potentiometric titration, and the like.
  • the sulfite ion concentration is adjusted to be preferably no greater than 2.0 mg SO 3 - /L, and more preferably no greater than 1.5 mg SO 3 - /L.
  • the sulfite ion concentration in the white water circulation line tends to be sufficiently lowered.
  • the sulfite ion concentration is greater than the upper limit, the reductive substances may not be sufficiently decreased.
  • the sulfite ion concentration may be measured according to JIS K 0102: 2008.
  • the amount of dissolved oxygen is adjusted to be preferably no less than 1 mg/L, and more preferably no less than 5 mg/L and no greater than 100 mg/L.
  • the amount of dissolved oxygen falls within the above range, the amount of oxygen in the white water circulation line would be sufficient, whereby the generation of the slime tends to be effectively controlled.
  • the amount of dissolved oxygen is greater than the upper limit, the amount of oxygen in the white water circulation line may be unnecessarily excessive.
  • the amount of dissolved oxygen is less than the lower limit, the control of the generation of the slime may fail.
  • the amount of dissolved oxygen may be measured by using a dissolved oxygen meter.
  • the viable cell number is not particularly limited, and is typically no greater than 1 x 10 7 CFU/mL, and preferably no greater than 1 x 10 6 CFU/mL. When the viable cell number is greater than the upper limit, the control of the generation of the slime may fail.
  • the viable cell number is measured by a colony counting method in which water from a cooling water line which should be prevented from rotting is employed as a microorganism source, and determines the number of colonies formed from a certain amount of the water to designate the viable cell number.
  • the viable cell number may be also determined according to an absorbance/ turbidity measuring method, a weight measuring method, or the like.
  • the colony counting method is not particularly limited, and is exemplified by a plate culture method, a capillary method, a membrane filter method and the like.
  • the sterilization rate is not particularly limited, and is typically no less than 99.5%, and preferably no less than 99.9%. When the sterilization rate is less than the lower limit, the control of the generation of the slime may fail.
  • the measurement step may be also carried out by measuring other parameter.
  • the other parameter is not particularly limited, and is exemplified by markers such as the amount of calcium ion, electric conductivity, glucose concentration, starch concentration, pH and turbidity.
  • condition of the steps involving e.g., the temperature, the pressure, the time period and the equipment in each step are not particularly limited, and may be appropriately predetermined according to the material and the like used.
  • the number of substeps of each step is not also particularly limit, and either one substep, or multiple substeps may be carried out.
  • Quantitative determination or qualitative determination of the material and the product may be carried out in accordance with a well-known method such as NMR, IR, an element analysis or mass spectrometry.
  • the material used may be alone, or a plurality of types of material may be used in combination.
  • the slime control method can be suitably used in a paper making process in paper manufacture.
  • recycling or a decrease in the amount of the slime control agent used, a decrease in the amount of fresh water used, diminishing of a wastewater treatment, and the like may be also contemplated.
  • ORP Oxidation Reduction Potential
  • the oxidation reduction potential (mV) was measured by using an oxidation reduction potential meter (manufactured by Toko Kagaku CO., LTD.) through use of potentiometry.
  • the sulfite ion concentration (mg SO 3 - /L) was measured according to JIS K 0102:2008. Specifically, an appropriate amount of a sample was charged into a volumetric flask, and thereto were added a pararosaniline solution, a formaldehyde solution and a mercury chloride solution to allow for color development. After leaving to stand for 20 min, colorimetry at 572 nm was conducted using a blank solution separately prepared similarly as a control. Thus, the sulfite ion concentration was determined.
  • the amount of dissolved oxygen was measured using a diaphragm electrode type dissolved oxygen meter (manufactured by Orbisphere, Inc.,).
  • the viable cell number was measured by: diluting a test water; mixing well a certain amount of the same with a nutrition-containing agar medium; plate-culturing the mixture for 1 day; and thereafter counting the number of colonies produced.
  • the sterilization effect was determined according to the following evaluation criteria.
  • the slime control effect was determined according to the following evaluation criteria.
  • a 12% sodium hypochlorite was prepared to give a preparation A.
  • DBNPA 2,2-Dibromo-3-nitrilopropionamide
  • DBNE 2,2-Dibromo-2-nitroethanol
  • the oxidation reduction potential, the sulfite ion concentration, the amount of dissolved oxygen and the viable cell number were measured.
  • the oxidation reduction potential of the white water was -388 mV; the sulfite ion concentration was 8.8 mg SO 3 - /L; the amount of dissolved oxygen was less than 0.1 mg/L; and the viable cell number was 3.8 x 10 8 CFU/mL.
  • the white water collected from the paper making machinery was taken in a volume of 2 L, and was aerated with the air at a flow rate of 300 mL/min (corresponding to 1 m 3 /hour with respect to a unit bottom area of 1 m 2 ) for 5 min by using a diffuser tube. Thereafter, a slime control agent was added thereto such that a concentration in terms of the active ingredient concentration was attained, and 10 min later, the oxidation reduction potential, the sulfite ion concentration, the amount of dissolved oxygen and the viable cell number were measured (Example 1).
  • Example 13 Furthermore, in a similar manner to Example 1 except that the slime control agent (preparation) was not added, the oxidation reduction potential, the sulfite ion concentration, the amount of dissolved oxygen and the viable cell number were measured (Comparative Example 13). The sterilization rate of Example 1 was calculated from the viable cell number before the treatment and the viable cell number in Example 1. In addition, the sterilization effect was evaluated.
  • the oxidation reduction potential, the sulfite ion concentration, the amount of dissolved oxygen, the viable cell number and the sterilization rate were measured in a similar manner to Example 1 except that the type and the concentration of the slime control agent (preparation) added were as shown in Table 1.
  • the oxidation reduction potential, the sulfite ion concentration, the amount of dissolved oxygen, the viable cell number and the sterilization rate were measured in a similar manner to Example 1 except that the aerating treatment was not carried out, and that the type and the concentration of the slime control agent (preparation) added were as shown in Table 1 (Comparative Example 1).
  • the sterilization rate of Comparative Example 1 was calculated from the viable cell number before the treatment and the viable cell number in Comparative Example 1. In addition, the sterilization effect was evaluated.
  • Example 2 40 done 12 0 5.8 1.0 E-05 100.0 A
  • Example 3 100 done 104 0 5.4 3.1 E+04 100.0 A
  • Example 4 preparation B 20 done 27 0 5.6 3.6 E+04 100.0 A
  • Example 5 40 done 210 0 5.5 5.8 E+03 100.0 A
  • Example 6 100 done 288 0 5.1 2.4 E+03 100.0 A
  • Example 7 preparation C 20 done -33 1.1 5.2 7.1 E+04 100.0 A
  • Example 8 40 done 31 0 5.8 5.9 E+03 100.0 A
  • Example 9 100 done 92 0 5.4 3.1 E+03 100.0 A
  • Example 10 preparation D 20 done -46 1.1 5.3 1.1 E+05 100.0 A
  • Example 11 40 done 2 0 5.7 8.7 E+03 100.0 A
  • Example 12 100 done 57 0 5.2 4.2 E+03 100.0 A Comparative Example 1 preparation A 20 not done -366 8.3 ⁇ 0.1 3.7 E+08 2.6 D Comparative Example 2 40 not done
  • the oxidation reduction potential, the sulfite ion concentration, the amount of dissolved oxygen and the viable cell number were measured (measurement step).
  • the oxidation reduction potential of the white water was -361 mV; the sulfite ion concentration was 8.8 mg SO 3 - /L; the amount of dissolved oxygen was less than 0.1 mg/L; and the viable cell number was 4.0 x 10 8 CFU/mL.
  • the white water was aerated with the air by using a diffuser tube provided with openings having a diameter of 2 mm with each interval of 10 cm, at an aeration rate of 5 m 3 /hour with respect to the unit area of 1 m 2 (aerating step).
  • a raw material pulp slurry from a machine tank which had been prepared using a Laubholz bleached Kraft pulp and a de-inked pulp as raw material pulps, was mixed with the white water from the aeration tank.
  • the preparation A was added to the white water at a rate of 100 mg/L (adding step of the slime control agent), and the raw material pulp slurry was transferred to an inlet via a screen by way of a fan pump.
  • the raw material pulp slurry transferred to the inlet was fed to a wire part and was dewatered.
  • the dewatered wet sheet was transferred from a press part to a dryer part.
  • the white water separated in the wire part was reserved in a white water silo, and a part thereof was again charged into the aeration tank, followed by aerating in a similar manner to that described above (white water circulation line).
  • Example 13 Fourteen days later, the oxidation reduction potential, the sulfite ion concentration, the amount of dissolved oxygen and the viable cell number of the white water were measured (Example 13). In addition, the amount of the slime adhered in the piping of the white water circulation line was visually observed. On the other hand, the oxidation reduction potential, the sulfite ion concentration, the amount of dissolved oxygen and the viable cell number were measured in a similar manner to Example 13 except that the slime control agent (Preparation) was not added (Comparative Example 18). The sterilization rate of Example 13 was calculated from the viable cell number before the treatment and the viable cell number in Example 13.
  • the oxidation reduction potential, the sulfite ion concentration, the amount of dissolved oxygen, the viable cell number and the sterilization rate were measured in a similar manner to Example 13 except that the type and the concentration of the slime control agent (preparation) added were as shown in Table 2. In addition, the amount of the slime adhered in the piping of the white water circulation line was visually observed.
  • the oxidation reduction potential, the sulfite ion concentration, the amount of dissolved oxygen and the viable cell number were measured in a similar manner to Example 13 except that the aerating treatment was not carried out and that the type and the concentration of the slime control agent (preparation) added were as shown in Table 2 (Comparative Examples 14 to 17).
  • the amount of the slime adhered in the piping of the white water circulation line was visually observed.
  • the sterilization rates of Comparative Examples 14 to 17 were calculated, respectively, from the viable cell number before the treatment and the viable cell numbers in Comparative Examples 14 to 17.
  • the oxidation reduction potential, the sulfite ion concentration, the amount of dissolved oxygen and the viable cell number were measured (measurement step).
  • the oxidation reduction potential of the white water was -387 mV; the sulfite ion concentration was 9.0 mg SO 3 - /L; the amount of dissolved oxygen was less than 0.1 mg/L; and the viable cell number was 4.1 x 10 8 CFU/mL.
  • a water feeding line for feeding water into the white water circulation line was aerated with the air by using a diffuser tube provided with openings having a diameter of 2 mm with each interval of 10 cm, at an aeration rate of 2 m 3 /hour with respect to the unit area of 1 m 2 (aerating step).
  • a raw material pulp slurry from a machine tank which had been prepared using a Laubholz bleached Kraft pulp and a de-inked pulp as raw material pulps, was mixed with the resulting white water.
  • the preparation A was added to the aeration tank at a rate of 100 mg/L (adding step of the slime control agent), and the raw material pulp slurry was transferred to an inlet via a screen by way of a fan pump.
  • the raw material pulp slurry transferred to the inlet was fed to a wire part and was dewatered.
  • the dewatered wet sheet was transferred from a press part to a dryer part.
  • the white water separated in the wire part was reserved in a white water silo, and the white water was circulated (white water circulation line). Fourteen days later, the oxidation reduction potential, the sulfite ion concentration, the amount of dissolved oxygen and the viable cell number of the white water were measured.
  • Example 17 the amount of the slime adhered in the piping of the white water circulation line was visually observed.
  • Example 17 the oxidation reduction potential, the sulfite ion concentration, the amount of dissolved oxygen and the viable cell number were measured in a similar manner to Example 17 except that the slime control agent (Preparation) was not added (Comparative Example 23).
  • the sterilization rate of Example 17 was calculated from the viable cell number before the treatment and the viable cell number in Example 17.
  • the oxidation reduction potential, the sulfite ion concentration, the amount of dissolved oxygen, the viable cell number and the sterilization rate were measured in a similar manner to Example 17 except that the aeration rate, and the type and the concentration of the slime control agent (preparation) added were as shown in Table 3. In addition, the amount of the slime adhered in the piping of the white water circulation line was visually observed.
  • the oxidation reduction potential, the sulfite ion concentration, the amount of dissolved oxygen and the viable cell number were measured in a similar manner to Example 17 except that the aerating treatment was not carried out and that the type and the concentration of the slime control agent (preparation) added were as shown in Table 3. In addition, the amount of the slime adhered in the piping of the white water circulation line was visually observed. Without carrying out the aerating treatment, the sterilization rates of Comparative Examples 19 to 22 were calculated, respectively, from the viable cell number before the treatment and the viable cell numbers in Comparative Examples 19 to 22.
  • the slime control method can be suitably used in a paper making process in paper manufacture.

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JP2013144052A JP5952230B2 (ja) 2013-07-09 2013-07-09 スライム抑制方法
JP2013144051A JP6002095B2 (ja) 2013-07-09 2013-07-09 スライム抑制方法
PCT/JP2014/068365 WO2015005404A1 (fr) 2013-07-09 2014-07-09 Procédé de contrôle de boue

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EP4130378A4 (fr) * 2020-05-22 2023-10-11 Kurita Water Industries Ltd. Procédé de suppression de production de sulfure d'hydrogène dans des réservoirs d'eau

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JP6569758B1 (ja) * 2018-03-14 2019-09-04 栗田工業株式会社 ピッチ障害防止方法
JP6954387B2 (ja) * 2020-02-14 2021-10-27 栗田工業株式会社 水中のでんぷん濃度の連続測定方法および装置
EP4310058A1 (fr) * 2022-07-20 2024-01-24 Wingscompany, S.L. Procédé de traitement de l'eau utilisant des nanobulles et un biocide dans la production de pâte à bois, de papier et de carton

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EP4130378A4 (fr) * 2020-05-22 2023-10-11 Kurita Water Industries Ltd. Procédé de suppression de production de sulfure d'hydrogène dans des réservoirs d'eau

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ES2716891T3 (es) 2019-06-17
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CN105378178A (zh) 2016-03-02
CN105378178B (zh) 2017-07-11
EP3020862A4 (fr) 2017-03-15
KR101793979B1 (ko) 2017-11-06

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