WO2013145440A1 - Method of slime control in paper pulp manufacturing process - Google Patents

Method of slime control in paper pulp manufacturing process Download PDF

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Publication number
WO2013145440A1
WO2013145440A1 PCT/JP2012/080696 JP2012080696W WO2013145440A1 WO 2013145440 A1 WO2013145440 A1 WO 2013145440A1 JP 2012080696 W JP2012080696 W JP 2012080696W WO 2013145440 A1 WO2013145440 A1 WO 2013145440A1
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salt
manufacturing process
paper pulp
added
inorganic
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PCT/JP2012/080696
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French (fr)
Japanese (ja)
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勝彦 日▲高▼
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栗田工業株式会社
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Priority to KR1020147024285A priority Critical patent/KR101488681B1/en
Priority to CN201280071786.5A priority patent/CN104204352A/en
Publication of WO2013145440A1 publication Critical patent/WO2013145440A1/en

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    • 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
    • C02F1/72—Treatment of water, waste water, or sewage by oxidation
    • C02F1/76—Treatment of water, waste water, or sewage by oxidation with halogens or compounds of halogens
    • 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
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/03—Non-macromolecular organic compounds
    • D21H17/05—Non-macromolecular organic compounds containing elements other than carbon and hydrogen only
    • D21H17/07—Nitrogen-containing compounds
    • 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
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/03—Non-macromolecular organic compounds
    • D21H17/05—Non-macromolecular organic compounds containing elements other than carbon and hydrogen only
    • D21H17/11—Halides
    • 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
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/63—Inorganic compounds
    • D21H17/66—Salts, e.g. alums
    • 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
    • D21H21/14—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 characterised by function or properties in or on the paper
    • D21H21/36—Biocidal agents, e.g. fungicidal, bactericidal, insecticidal agents
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/26—Nature of the water, waste water, sewage or sludge to be treated from the processing of plants or parts thereof
    • C02F2103/28—Nature of the water, waste water, sewage or sludge to be treated from the processing of plants or parts thereof from the paper or cellulose industry
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00—Specific treatment goals
    • C02F2303/04—Disinfection

Definitions

  • the present invention relates to a slime control method in a paper pulp manufacturing process, and in particular, in a paper pulp manufacturing process using waste paper as a raw material, in applying an inorganic disinfectant, an effective sterilization is performed by combining appropriate oxidizing agents. It relates to a method for slime control.
  • Organic fungicides have been used for many years as slime control agents in paper pulp production.
  • the pulp and paper manufacturing process contains a large amount of various organic substances and reducing substances, the organic bactericides cannot provide an effective bactericidal effect due to redox decomposition with them. , You may not have enough slime control. This is a major problem in the paper pulp manufacturing process using waste paper as a raw material, which is particularly rich in organic matter and may contain reducing substances.
  • Examples of organic substances included in the paper pulp manufacturing process include fibers, starch, fatty acids, and various polymers.
  • Examples of reducing substances include sulfides, sulfurous acid, and hyposulfite. Therefore, in order to decompose reducing substances and dissolved organic substances that easily react with organic fungicides, by adding an oxidizing agent such as hypochlorite or chlorite prior to the addition of organic fungicides, There have been proposed methods for preventing decomposition of an organic disinfectant and maintaining a slime control effect in a paper pulp manufacturing process (for example, Patent Documents 1 and 2).
  • inorganic fungicides having a higher bactericidal effect than organic fungicides have been used in the paper pulp manufacturing process.
  • a product compound obtained by diluting and mixing sodium hypochlorite and ammonium bromide and a product compound obtained by diluting and mixing sodium hypochlorite and ammonium sulfate are used as inorganic fungicides. It is coming.
  • these inorganic disinfectants like organic disinfectants, are less effective due to degradation by reaction with reducing substances and dissolved organic matter in the pulp and paper manufacturing process, and are more effective than organic disinfectants. It has become a bigger challenge.
  • the present invention prevents the decomposition of inorganic chlorine-based disinfectants by adding an optimum oxidizing agent, and has fewer inorganic disinfectants. It is an object of the present invention to provide a method for slime control by exerting a high bactericidal effect with an added amount of.
  • hypochlorous acid and / or a salt thereof and an ammonium salt in a paper pulp manufacturing process using waste paper containing a large amount of reducing substances and dissolved organic substances as a raw material.
  • chlorous acid and / or its salt as an oxidizing agent for inhibiting decomposition of inorganic fungicides when slime is controlled using inorganic fungicides produced from It discovered that it could suppress effectively.
  • the present invention has been achieved on the basis of such knowledge, and the gist thereof is as follows.
  • the chlorous acid and / or salt thereof is more upstream of the paper pulp manufacturing process than the point of addition of the inorganic disinfectant produced from hypochlorous acid and / or its salt and ammonium salt.
  • the slime control method in the paper pulp manufacturing process characterized by adding.
  • the residual chlorine concentration in the aqueous system immediately after adding hypochlorous acid and / or a salt thereof and an ammonium salt is the total chlorine concentration by the DPD method.
  • chlorous acid and / or a salt thereof is added to an aqueous system so that the measured value by an iodine titration method based on JISK0101 is 0.1 to 50 mg / L asCl 2.
  • the slime control method in the paper pulp manufacturing process characterized by adding.
  • an inorganic disinfectant produced from hypochlorous acid and / or a salt thereof and an ammonium salt is added to slime.
  • the use of chlorous acid and / or its salt effectively suppresses the decomposition of this inorganic fungicide, and a high bactericidal effect can be obtained with a small amount of inorganic fungicide added. It becomes.
  • hypochlorous acid and / or a salt thereof (hereinafter sometimes referred to as “hypochlorous acid (salt)”) and an ammonium salt in a paper pulp manufacturing process using waste paper as a raw material.
  • hypochlorous acid (salt) chlorous acid and / or a salt thereof
  • chlorous acid (salt) chlorous acid and / or a salt thereof
  • Hypochlorous acid (salt) for generating the inorganic disinfectant used in the present invention includes alkali metal salts of hypochlorous acid such as sodium hypochlorite and potassium hypochlorite, calcium hypochlorite, etc. And alkaline earth metal salts of hypochlorous acid. These may be used alone or in combination of two or more.
  • ammonium salts include ammonium bromide, ammonium sulfate, ammonium nitrate and the like. These ammonium salts may also be used individually by 1 type, and may use 2 or more types together.
  • hypochlorous acid (salt) and ammonium salt are mixed to produce an inorganic compound such as chloramine and bromamine, and this is added as an inorganic fungicide to the water system in the paper pulp manufacturing process.
  • the concentration of each chemical added to the water system in the pulp and paper manufacturing process is not particularly limited because the appropriate amount of addition depends on the amount of organic substances, reducing substance concentration, and number of bacteria contained in the pulp and paper manufacturing process.
  • the amount of residual chlorine in the aqueous system immediately after the addition of chloric acid (salt) and ammonium salt is set to an addition amount such that the total chlorine concentration measured by the DPD method is 0.1 to 10 mg / L asCl 2. Is appropriate.
  • chlorite as an oxidant added to suppress the decomposition of such inorganic disinfectants
  • alkali metal salts of chlorite such as sodium chlorite and potassium chlorite, and calcium chlorite.
  • Alkaline earth metal salts of chlorous acid such as can be used. These chlorous acid (salts) may be used alone or in combination of two or more.
  • the amount of chlorous acid (salt) added varies depending on the concentration of dissolved organic matter and reducing substance, but it may be added so that the measured value by the iodine titration method based on JISK0101 is about 0.1 to 50 mg / L asCl 2. preferable.
  • the inorganic fungicide and chlorous acid (salt) can be added at the same place in the paper pulp production process, but the desired effect can be obtained. It is preferable to add chlorous acid (salt) prior to the addition of the agent, and in the paper pulp manufacturing process, chlorous acid (salt) may be added upstream of the addition position of the inorganic fungicide. It is preferable because the effect of inhibiting the decomposition of the inorganic fungicide by chlorous acid (salt) is further enhanced.
  • FIG. 1 is a system diagram showing a high-quality papermaking water system using wastepaper as a raw material.
  • broke deinked wastepaper pulp
  • LBKP coniferous bleached kraft pulp
  • recovered raw materials are used as raw materials.
  • the concentration of each raw material in the broke tank 3, DIP tank 2, and LBKP tank 1 is adjusted by charging water and concentrated water from the recovered water tank 16, and then introduced into the mixing chest 4 and mixed uniformly to form a slurry.
  • This slurry is sent to the wire part 11 through the machine chest 5, the seed box 6, and the white water from the white water silo 13 through the pump 7, the dust remover 8, the screen 9, and the inlet 10. It dehydrates through the press process in the press part 12, and the dry process in a dry part (not shown). White water obtained by dehydration is received by the white water silo 13.
  • clean hot water and recovered water from the water tank 18 are sprinkled from a shower nozzle (not shown) in order to keep the wire and felt clean.
  • the water in the water tank 18 is a filtrate obtained by separating the white water that has passed through the wire through the white water silo 13 and the seal pit 14 and collected in the recovery device 15. After being stored in the recovery water tank 16 from the recovery device 15, Part of the water was sent. The remainder of the recovered water is discharged out of the system through the secondary water tank 17.
  • chlorous acid (salt) is added from each pulp raw material between white water silos, hypochlorous acid (salt) and ammonium.
  • the inorganic disinfectant produced from the salt is preferably added between the seed box and the white water silo. More specifically, as shown in FIG. 1, the inorganic germicide from the inorganic water disinfectant generation and addition device 30 is added to the inlet 10 of the white water primary circulation system (between the pump 7 and the white water silo 13) or white water.
  • the chlorous acid (salt) from the chlorous acid (salt) adding device 20 is added to the silo 13 and the upstream DIP tank 2, mixing chest 4, or machine chest 5.
  • chlorous acid (salt) is added to the white water primary circulation system (between the pump 7 and the white water silo 13), and the inorganic disinfectant is added from the seal pit 14. It may be added between the recovered water tanks 16.
  • the addition of these drugs may be intermittent or continuous. In the case of intermittent addition, it is preferable to control so that chlorous acid (salt) is added first or simultaneously.
  • the residual chlorine concentration was measured by the DPD method (total chlorine), DPD method (free chlorine), and iodine titration method (JIS K0101).
  • DPD method total chlorine
  • NaClO and (NaClO + NH 4 Br) are measured, but NaClO 2 is not measured.
  • DPD method free chlorine
  • only NaClO is measured, and inorganic fungicides (NaClO + NH 4 Br) and NaClO 2 are not measured.
  • iodine titration method JISK0101
  • all of NaClO, an inorganic fungicide (NaClO + NH 4 Br), and NaClO 2 can be measured.
  • NaClO concentration Residual chlorine concentration measured by DPD method (free chlorine)
  • Inorganic disinfectant (NaClO + NH 4 Br) concentration Residual chlorine concentration measured by DPD method (total chlorine)-Measured by DPD method (free chlorine)
  • Residual chlorine concentration NaClO 2 concentration Residual chlorine concentration measured by iodine titration method (JISK0101)-Residual chlorine concentration measured by DPD method (total chlorine)
  • Example 3 The bactericidal effect on pulp slurry containing waste paper raw materials was evaluated by the following method.
  • the concentration of the chemicals shown in Table 3 is as shown in Table 3 with respect to the pulp slurry having a pulp concentration of 3% by weight containing 15% by weight of the deinked waste paper raw material, 75% by weight of LBKP, and 10% by weight of the waste paper raw material. Then, the mixture was allowed to stand at 30 ° C. for 30 minutes. In addition, when using together an oxidizing agent and an inorganic type germicide, these were added simultaneously. The slurry after standing for 30 minutes was mixed with 1/10 pY agar medium, and after standing still at 30 ° C. for 2 days, the number of colonies was counted. The results are shown in Table 3.
  • FIG. 2 is a graph showing the relationship between the concentration of the inorganic fungicide (NaClO + NH 4 Br) and the number of bacteria for each oxidizing agent addition concentration.
  • NaClO 2 and the inorganic germicide (NaClO + NH) are more effective than the case where the inorganic germicide (NaClO + NH 4 Br) is added alone or NaClO and the inorganic germicide (NaClO + NH 4 Br) are used in combination.
  • 4 Br in combination, a high bactericidal effect is obtained particularly in a region where the amount of inorganic bactericides added is low, and the effect of inhibiting the decomposition of inorganic bactericides by chlorous acid (salt) is as follows. It turns out that it is superior to chlorite.

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Organic Chemistry (AREA)
  • Pest Control & Pesticides (AREA)
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Abstract

The present invention enables slime control by adding an optimal oxidant in a paper pulp manufacturing process for which the stock material is used paper, which includes a considerable amount of reducing substances and dissolved organic matter, thus preventing decomposition of inorganic chlorine bactericide and exerting high bactericidal efficacy with less of the inorganic bactericide added. An inorganic bactericide generated from hypochlorous acid (salt) and ammonium salt and chlorous acid (salt) are added to an aqueous system for a paper pulp manufacturing process for which the stock material is used paper. The inorganic bactericide generated from hypochlorous acid (salt) and ammonium salt is added after the chlorous acid (salt) has been added. Alternatively, the chlorous acid (salt) is added further upstream in the manufacturing process than the addition of the inorganic bactericide generated from hypochlorous acid (salt) and ammonium salt.

Description

紙パルプ製造工程におけるスライムコントロール方法Slime control method in pulp and paper manufacturing process
　本発明は紙パルプ製造工程におけるスライムコントロール方法に係わり、特に古紙を原料とする紙パルプ製造工程において、無機殺菌剤を適用するにあたり、適切な酸化剤を組み合わせることで、効率的な殺菌を行ってスライムコントロールする方法に関する。 The present invention relates to a slime control method in a paper pulp manufacturing process, and in particular, in a paper pulp manufacturing process using waste paper as a raw material, in applying an inorganic disinfectant, an effective sterilization is performed by combining appropriate oxidizing agents. It relates to a method for slime control.
　紙パルプ製造におけるスライムコントロール剤としては、長年、有機系殺菌剤が用いられてきた。しかし、紙パルプ製造工程には、様々な有機物や還元物質が多量に含まれているため、これらとの酸化還元反応による分解のために、有機系殺菌剤では効果的な殺菌効果が得られず、十分なスライムコントロールができないことがある。このことは、特に有機物が多く、還元物質が含まれる場合がある古紙を原料とする紙パルプ製造工程において大きな問題となる。 Organic fungicides have been used for many years as slime control agents in paper pulp production. However, since the pulp and paper manufacturing process contains a large amount of various organic substances and reducing substances, the organic bactericides cannot provide an effective bactericidal effect due to redox decomposition with them. , You may not have enough slime control. This is a major problem in the paper pulp manufacturing process using waste paper as a raw material, which is particularly rich in organic matter and may contain reducing substances.
　紙パルプ製造工程に含まれる有機物としては、繊維、澱粉、脂肪酸、各種ポリマーがあり、還元物質としては硫化物や亜硫酸、次亜硫酸などがある。そこで、有機系殺菌剤と反応しやすい還元物質や溶存有機物を分解するために、有機系殺菌剤の添加に先立って次亜塩素酸塩や亜塩素酸塩などの酸化剤を添加することで、有機系殺菌剤の分解を防ぎ、紙パルプ製造工程におけるスライムコントロール効果を維持する方法が提案されている（例えば、特許文献１，２）。 Examples of organic substances included in the paper pulp manufacturing process include fibers, starch, fatty acids, and various polymers. Examples of reducing substances include sulfides, sulfurous acid, and hyposulfite. Therefore, in order to decompose reducing substances and dissolved organic substances that easily react with organic fungicides, by adding an oxidizing agent such as hypochlorite or chlorite prior to the addition of organic fungicides, There have been proposed methods for preventing decomposition of an organic disinfectant and maintaining a slime control effect in a paper pulp manufacturing process (for example, Patent Documents 1 and 2).
　一方で、近年、紙パルプ製造工程では、有機系殺菌剤よりもさらに殺菌効果の高い無機系殺菌剤が用いられるようになった。例えば、次亜塩素酸ナトリウムと臭化アンモニウムとを希釈混合して得られる生成化合物や、次亜塩素酸ナトリウムと硫酸アンモニウムを希釈混合して得られる生成化合物が無機系殺菌剤として用いられるようになってきている。しかし、これらの無機系殺菌剤も、有機系殺菌剤と同様に、紙パルプ製造工程内の還元物質や溶存有機物との反応による分解で効果が低下するものであり、有機系殺菌剤よりもより一層大きな課題となっている。 On the other hand, in recent years, inorganic fungicides having a higher bactericidal effect than organic fungicides have been used in the paper pulp manufacturing process. For example, a product compound obtained by diluting and mixing sodium hypochlorite and ammonium bromide and a product compound obtained by diluting and mixing sodium hypochlorite and ammonium sulfate are used as inorganic fungicides. It is coming. However, these inorganic disinfectants, like organic disinfectants, are less effective due to degradation by reaction with reducing substances and dissolved organic matter in the pulp and paper manufacturing process, and are more effective than organic disinfectants. It has become a bigger challenge.
　そこで、同様に酸化剤である次亜塩素酸塩をこのような無機系殺菌剤の添加に先立って添加することで、無機系殺菌剤の分解を防ぐ方法が提案されている(特許文献３)。 Then, the method of preventing decomposition | disassembly of an inorganic type germicide is proposed by adding the hypochlorite which is an oxidizing agent prior to addition of such an inorganic type germicide (patent document 3). .
特許第３２１６２７３号公報Japanese Patent No. 3216273 特許第４０７１９５９号公報Japanese Patent No. 4071959 特開２００９－２４１０１８号公報JP 2009-244108 A
　しかし、無機系殺菌剤はその反応性の高さから、適切な酸化剤を組み合わせなければ、反対に分解を促進することがあり、特許文献３で提案されている次亜塩素酸塩では十分な効果が得られないことが本発明者の研究により判明した。 However, due to the high reactivity of inorganic fungicides, decomposition may be accelerated on the contrary if not combined with an appropriate oxidizing agent. Hypochlorite proposed in Patent Document 3 is sufficient. The inventor's research revealed that no effect was obtained.
　本発明は、多量の還元物質や溶存有機物を含む古紙を原料とする紙パルプ製造工程において、最適な酸化剤を添加することで、無機塩素系殺菌剤の分解を防ぎ、より少ない無機系殺菌剤の添加量で高い殺菌効果を発揮させてスライムコントロールする方法を提供することを課題とする。 In the pulp and paper manufacturing process using waste paper containing a large amount of reducing substances and dissolved organic substances as a raw material, the present invention prevents the decomposition of inorganic chlorine-based disinfectants by adding an optimum oxidizing agent, and has fewer inorganic disinfectants. It is an object of the present invention to provide a method for slime control by exerting a high bactericidal effect with an added amount of.
　本発明者は、上記課題を解決すべく鋭意検討を重ねた結果、多量の還元物質や溶存有機物を含む古紙を原料とする紙パルプ製造工程において、次亜塩素酸及び／又はその塩とアンモニウム塩から生成する無機系殺菌剤を用いてスライムコントロールする際の無機系殺菌剤の分解抑制のための酸化剤として、亜塩素酸及び／又はその塩を用いることにより、この無機系殺菌剤の分解を効果的に抑制することができることを見出した。 As a result of intensive studies to solve the above problems, the present inventor has obtained hypochlorous acid and / or a salt thereof and an ammonium salt in a paper pulp manufacturing process using waste paper containing a large amount of reducing substances and dissolved organic substances as a raw material. By using chlorous acid and / or its salt as an oxidizing agent for inhibiting decomposition of inorganic fungicides when slime is controlled using inorganic fungicides produced from It discovered that it could suppress effectively.
　本発明はこのような知見に基いて達成されたものであり、以下を要旨とする。 The present invention has been achieved on the basis of such knowledge, and the gist thereof is as follows.
［１］　古紙を原料とする紙パルプ製造工程の水系に、次亜塩素酸及び／又はその塩とアンモニウム塩から生成する無機系殺菌剤と、亜塩素酸及び／又はその塩とを添加することを特徴とする紙パルプ製造工程におけるスライムコントロール方法。 [1] Adding an inorganic disinfectant produced from hypochlorous acid and / or a salt thereof and an ammonium salt and chlorous acid and / or a salt thereof to an aqueous system in a paper pulp manufacturing process using waste paper as a raw material. A slime control method in a paper pulp manufacturing process characterized by the above.
［２］　［１］において、亜塩素酸及び／又はその塩を添加した後、次亜塩素酸及び／又はその塩とアンモニウム塩から生成する無機系殺菌剤を添加することを特徴とする紙パルプ製造工程におけるスライムコントロール方法。 [2] In [1], after adding chlorous acid and / or a salt thereof, a paper pulp characterized by adding an inorganic disinfectant produced from hypochlorous acid and / or a salt thereof and an ammonium salt Slime control method in the manufacturing process.
［３］　［１］において、亜塩素酸及び／又はその塩を、次亜塩素酸及び／又はその塩とアンモニウム塩から生成する無機系殺菌剤の添加点よりも紙パルプ製造工程の上流側で添加することを特徴とする紙パルプ製造工程におけるスライムコントロール方法。 [3] In [1], the chlorous acid and / or salt thereof is more upstream of the paper pulp manufacturing process than the point of addition of the inorganic disinfectant produced from hypochlorous acid and / or its salt and ammonium salt. The slime control method in the paper pulp manufacturing process characterized by adding.
［４］　［１］ないし［３］のいずれかにおいて、前記無機系殺菌剤がクロラミン及び／又はブロマミンであることを特徴とする紙パルプ製造工程におけるスライムコントロール方法。 [4] The slime control method in the paper pulp manufacturing process according to any one of [1] to [3], wherein the inorganic fungicide is chloramine and / or bromamine.
［５］　［１］ないし［４］のいずれかにおいて、次亜塩素酸及び／又はその塩とアンモニウム塩とを、これらを添加した直後の水系の残留塩素濃度が、ＤＰＤ法による全塩素濃度の測定値として０．１～１０ｍｇ／Ｌ　ａｓＣｌ２となるような添加量で水系に添加することを特徴とする紙パルプ製造工程におけるスライムコントロール方法。 [5] In any one of [1] to [4], the residual chlorine concentration in the aqueous system immediately after adding hypochlorous acid and / or a salt thereof and an ammonium salt is the total chlorine concentration by the DPD method. A slime control method in a paper pulp manufacturing process, which is added to an aqueous system in such an amount that a measured value is 0.1 to 10 mg / L asCl 2 .
［６］　［１］ないし［５］のいずれかにおいて、次亜塩素酸及び／又はその塩とアンモニウム塩とを、次亜塩素酸及び／又はその塩：アンモニウム塩＝１：１～３（ＣｌとＮのモル比）で混合して用いることを特徴とする紙パルプ製造工程におけるスライムコントロール方法。 [6] In any one of [1] to [5], hypochlorous acid and / or a salt thereof and an ammonium salt are mixed with hypochlorous acid and / or a salt thereof: ammonium salt = 1: 1 to 3 (Cl A slime control method in a paper pulp manufacturing process, which is used by mixing at a molar ratio of N to N).
［７］　［１］ないし［６］のいずれかにおいて、亜塩素酸及び／又はその塩を、ＪＩＳＫ０１０１に基づくヨウ素滴定法による測定値として０．１～５０ｍｇ／Ｌ　ａｓＣｌ２となるように水系に添加することを特徴とする紙パルプ製造工程におけるスライムコントロール方法。 [7] In any one of [1] to [6], chlorous acid and / or a salt thereof is added to an aqueous system so that the measured value by an iodine titration method based on JISK0101 is 0.1 to 50 mg / L asCl 2. The slime control method in the paper pulp manufacturing process characterized by adding.
　本発明によれば、多量の溶存有機物や還元物質を含む古紙を原料とする紙パルプ製造工程において、次亜塩素酸及び／又はその塩とアンモニウム塩から生成する無機系殺菌剤を添加してスライムコントロールをするに当たり、亜塩素酸及び／又はその塩を併用することにより、この無機系殺菌剤の分解を効果的に抑制し、少ない無機系殺菌剤の添加量で高い殺菌効果を得ることが可能となる。 According to the present invention, in a pulp and paper manufacturing process using waste paper containing a large amount of dissolved organic substances and reducing substances as a raw material, an inorganic disinfectant produced from hypochlorous acid and / or a salt thereof and an ammonium salt is added to slime. When controlling, the use of chlorous acid and / or its salt effectively suppresses the decomposition of this inorganic fungicide, and a high bactericidal effect can be obtained with a small amount of inorganic fungicide added. It becomes.
本発明が適用される紙パルプ製造工程の一例を示す系統図である。It is a systematic diagram which shows an example of the paper pulp manufacturing process to which this invention is applied. 実験例３の結果を示すグラフである。10 is a graph showing the results of Experimental Example 3.
　以下に本発明の紙パルプ製造工程におけるスライムコントロール方法の実施の形態を詳細に説明する。 Hereinafter, embodiments of the slime control method in the paper pulp manufacturing process of the present invention will be described in detail.
　本発明においては、古紙を原料とする紙パルプ製造工程において、次亜塩素酸及び／又はその塩（以下「次亜塩素酸（塩）」と記載する場合がある。）とアンモニウム塩から生成する無機系殺菌剤を添加してスライムコントロールを行うに当たり、亜塩素酸及び／又はその塩（以下「亜塩素酸（塩）」と記載する場合がある。）を併用添加して、無機系殺菌剤の分解を抑制する。 In the present invention, it is produced from hypochlorous acid and / or a salt thereof (hereinafter sometimes referred to as “hypochlorous acid (salt)”) and an ammonium salt in a paper pulp manufacturing process using waste paper as a raw material. When slime control is performed by adding an inorganic fungicide, chlorous acid and / or a salt thereof (hereinafter sometimes referred to as “chlorous acid (salt)”) is added in combination, and an inorganic fungicide is added. Suppresses decomposition.
＜無機系殺菌剤＞
　本発明で用いる無機系殺菌剤を生成させる次亜塩素酸（塩）としては、次亜塩素酸ナトリウム、次亜塩素酸カリウム等の次亜塩素酸のアルカリ金属塩や、次亜塩素酸カルシウム等の次亜塩素酸のアルカリ土類金属塩が挙げられる。これらは、１種を単独で用いてもよく、２種以上を併用してもよい。 <Inorganic germicide>
Hypochlorous acid (salt) for generating the inorganic disinfectant used in the present invention includes alkali metal salts of hypochlorous acid such as sodium hypochlorite and potassium hypochlorite, calcium hypochlorite, etc. And alkaline earth metal salts of hypochlorous acid. These may be used alone or in combination of two or more.
　一方、アンモニウム塩としては、臭化アンモニウム、硫酸アンモニウム、硝酸アンモニウム等が挙げられる。これらのアンモニウム塩も、１種を単独で用いてもよく、２種以上を併用してもよい。 On the other hand, ammonium salts include ammonium bromide, ammonium sulfate, ammonium nitrate and the like. These ammonium salts may also be used individually by 1 type, and may use 2 or more types together.
　本発明では、これら次亜塩素酸（塩）とアンモニウム塩を混合してクロラミン、ブロマミン等の無機系化合物を生成させ、これを無機系殺菌剤として紙パルプ製造工程の水系に添加する。 In the present invention, these hypochlorous acid (salt) and ammonium salt are mixed to produce an inorganic compound such as chloramine and bromamine, and this is added as an inorganic fungicide to the water system in the paper pulp manufacturing process.
　紙パルプ製造工程の水系への各薬剤の添加濃度は、紙パルプ製造工程の原料に含まれる有機物量や還元物質濃度、菌数によって適切な添加量は決まるので、特に制限はないが、次亜塩素酸（塩）とアンモニウム塩とを添加した直後の水系の残留塩素濃度が、ＤＰＤ法による全塩素濃度の測定値として０．１～１０ｍｇ／Ｌ　ａｓＣｌ２となるような添加量とすることが適当である。 The concentration of each chemical added to the water system in the pulp and paper manufacturing process is not particularly limited because the appropriate amount of addition depends on the amount of organic substances, reducing substance concentration, and number of bacteria contained in the pulp and paper manufacturing process. The amount of residual chlorine in the aqueous system immediately after the addition of chloric acid (salt) and ammonium salt is set to an addition amount such that the total chlorine concentration measured by the DPD method is 0.1 to 10 mg / L asCl 2. Is appropriate.
　なお、次亜塩素酸（塩）とアンモニウム塩とは通常、次亜塩素酸（塩）：アンモニウム塩＝１：１～３（ＣｌとＮのモル比）で混合して用いられる。 It should be noted that hypochlorous acid (salt) and ammonium salt are usually used in a mixture of hypochlorous acid (salt): ammonium salt = 1: 1 to 3 (Molar ratio of Cl and N).
＜亜塩素酸（塩）＞
　このような無機系殺菌剤の分解抑制のために添加する酸化剤としての亜塩素酸塩としては、亜塩素酸ナトリウム、亜塩素酸カリウム等の亜塩素酸のアルカリ金属塩や、亜塩素酸カルシウム等の亜塩素酸のアルカリ土類金属塩を用いることができる。これらの亜塩素酸（塩）も、１種を単独で用いてもよく、２種以上を併用してもよい。 <Chlorous acid (salt)>
Examples of chlorite as an oxidant added to suppress the decomposition of such inorganic disinfectants include alkali metal salts of chlorite such as sodium chlorite and potassium chlorite, and calcium chlorite. Alkaline earth metal salts of chlorous acid such as can be used. These chlorous acid (salts) may be used alone or in combination of two or more.
　亜塩素酸（塩）の添加量は、少な過ぎると無機系殺菌剤の分解抑制効果を十分に得ることができず、多過ぎてもそれ以上の効果は得られず、薬剤コストが高くつく。亜塩素酸（塩）の添加量は溶存有機物や還元物質の濃度によっても異なるが、ＪＩＳＫ０１０１に基づくヨウ素滴定法による測定値として０．１～５０ｍｇ／Ｌ　ａｓＣｌ２程度となるように添加することが好ましい。 If the amount of chlorous acid (salt) added is too small, the effect of inhibiting the decomposition of the inorganic fungicide cannot be obtained sufficiently, and if it is too large, no further effect can be obtained, resulting in high drug costs. The amount of chlorous acid (salt) added varies depending on the concentration of dissolved organic matter and reducing substance, but it may be added so that the measured value by the iodine titration method based on JISK0101 is about 0.1 to 50 mg / L asCl 2. preferable.
＜添加方法＞
　本発明において、無機系殺菌剤及び亜塩素酸（塩）の添加方法としては、これらを紙パルプ製造工程の同じ場所に同時に添加しても目的とする効果を得ることができるが、無機系殺菌剤の添加に先立って亜塩素酸（塩）を添加することが好ましく、また、紙パルプ製造工程において、亜塩素酸（塩）を無機系殺菌剤の添加位置よりも上流側で添加することが、亜塩素酸（塩）による無機系殺菌剤の分解抑制効果がより一層高められることから好ましい。 <Addition method>
In the present invention, the inorganic fungicide and chlorous acid (salt) can be added at the same place in the paper pulp production process, but the desired effect can be obtained. It is preferable to add chlorous acid (salt) prior to the addition of the agent, and in the paper pulp manufacturing process, chlorous acid (salt) may be added upstream of the addition position of the inorganic fungicide. It is preferable because the effect of inhibiting the decomposition of the inorganic fungicide by chlorous acid (salt) is further enhanced.
　以下に、図面を参照して、これらの薬剤の添加方法について説明する。
　図１は、古紙を原料とする上質紙抄紙水系を示す系統図であり、この抄紙水系では、原料として、ブローク、ＤＩＰ（脱墨古紙パルプ）、ＬＢＫＰ（針葉樹晒クラフトパルプ）及び回収原料を用い、ブロークタンク３、ＤＩＰタンク２、ＬＢＫＰタンク１内の各原料をそれぞれ回収水タンク１６からの仕込水及び濃調水により濃度調整した後、ミキシングチェスト４に導入して均一に混合してスラリー状とする。このスラリーは、マシンチェスト５、種箱６を経て、白水サイロ１３からの白水と共に、ポンプ７、除塵機８、スクリーン９、インレット１０を経て、ワイヤーパート１１に送り込み、ワイヤーパート１１におけるワイヤー工程、プレスパート１２におけるプレス工程、ドライパート（図示せず）におけるドライ工程を経て脱水する。脱水により得られた白水は白水サイロ１３で受ける。ワイヤー工程、プレス工程においては、ワイヤー及びフェルトを清浄に維持するために、水タンク１８からの清温水及び回収水がシャワーノズル（図示せず）から散水される。この水タンク１８の水は、ワイヤーを通過した白水が白水サイロ１３、シールピット１４を経て回収装置１５で分離された濾液であり、回収装置１５から、回収水タンク１６に貯留された後、その一部が送水されたものである。回収水の残部は二次水タンク１７を経て系外へ排出される。 Below, with reference to drawings, the addition method of these chemical | medical agents is demonstrated.
FIG. 1 is a system diagram showing a high-quality papermaking water system using wastepaper as a raw material. In this papermaking water system, broke, DIP (deinked wastepaper pulp), LBKP (coniferous bleached kraft pulp) and recovered raw materials are used as raw materials. The concentration of each raw material in the broke tank 3, DIP tank 2, and LBKP tank 1 is adjusted by charging water and concentrated water from the recovered water tank 16, and then introduced into the mixing chest 4 and mixed uniformly to form a slurry. And This slurry is sent to the wire part 11 through the machine chest 5, the seed box 6, and the white water from the white water silo 13 through the pump 7, the dust remover 8, the screen 9, and the inlet 10. It dehydrates through the press process in the press part 12, and the dry process in a dry part (not shown). White water obtained by dehydration is received by the white water silo 13. In the wire process and the press process, clean hot water and recovered water from the water tank 18 are sprinkled from a shower nozzle (not shown) in order to keep the wire and felt clean. The water in the water tank 18 is a filtrate obtained by separating the white water that has passed through the wire through the white water silo 13 and the seal pit 14 and collected in the recovery device 15. After being stored in the recovery water tank 16 from the recovery device 15, Part of the water was sent. The remainder of the recovered water is discharged out of the system through the secondary water tank 17.
　このような紙製造工程の白水一次循環系のスライムコントロールを目的とする場合には、亜塩素酸（塩）を各パルプ原料から白水サイロの間に添加し、次亜塩素酸（塩）とアンモニウム塩から生成する無機系殺菌剤は種箱から白水サイロの間に添加することが好ましい。より具体的には、図１に示すように、無機系殺菌剤の生成、添加装置３０からの無機系殺菌剤を白水一次循環系（ポンプ７から白水サイロ１３の間）のインレット１０または、白水サイロ１３に添加し、その上流側のＤＩＰタンク２、又はミキシングチェスト４、又はマシンチェスト５に亜塩素酸（塩）添加装置２０からの亜塩素酸（塩）を添加する。 For the purpose of slime control of the white water primary circulation system in such a paper manufacturing process, chlorous acid (salt) is added from each pulp raw material between white water silos, hypochlorous acid (salt) and ammonium. The inorganic disinfectant produced from the salt is preferably added between the seed box and the white water silo. More specifically, as shown in FIG. 1, the inorganic germicide from the inorganic water disinfectant generation and addition device 30 is added to the inlet 10 of the white water primary circulation system (between the pump 7 and the white water silo 13) or white water. The chlorous acid (salt) from the chlorous acid (salt) adding device 20 is added to the silo 13 and the upstream DIP tank 2, mixing chest 4, or machine chest 5.
　その他の添加形態としては、回収水のスライムコントロールを目的として、亜塩素酸（塩）を白水一次循環系（ポンプ７から白水サイロ１３の間）に添加し、無機系殺菌剤をシールピット１４から回収水タンク１６の間に添加してもよい。
　これらの薬剤の添加は間欠的であっても、連続的であっても良い。間欠添加の場合は、先に、または同時に亜塩素酸（塩）が添加されるように制御を行うことが好ましい。 As other addition forms, for the purpose of slime control of recovered water, chlorous acid (salt) is added to the white water primary circulation system (between the pump 7 and the white water silo 13), and the inorganic disinfectant is added from the seal pit 14. It may be added between the recovered water tanks 16.
The addition of these drugs may be intermittent or continuous. In the case of intermittent addition, it is preferable to control so that chlorous acid (salt) is added first or simultaneously.
　以下に本発明例又は比較例に相当する実験例を挙げて本発明をより具体的に説明する。 Hereinafter, the present invention will be described more specifically with reference to experimental examples corresponding to the present invention examples or comparative examples.
　なお、以下の実験例で用いた薬剤は、亜塩素酸ナトリウム（ＮａＣｌＯ２）、次亜塩素酸ナトリウム（ＮａＣｌＯ）及び無機系殺菌剤（ＮａＣｌＯと臭化アンモニウムの混合生成物、ＮａＣｌＯ：ＮＨ４Ｂｒ＝１：１（ＣｌとＮのモル比））である。 The chemicals used in the following experimental examples are sodium chlorite (NaClO 2 ), sodium hypochlorite (NaClO), and an inorganic disinfectant (mixed product of NaClO and ammonium bromide, NaClO: NH 4 Br = 1: 1 (molar ratio of Cl to N)).
　また、残留塩素濃度の測定には、ＤＰＤ法(全塩素)、ＤＰＤ法（遊離塩素）、及びヨウ素滴定法（ＪＩＳＫ０１０１）の３つを実施した。
　ＤＰＤ法(全塩素)では、ＮａＣｌＯと（ＮａＣｌＯ＋ＮＨ４Ｂｒ）の２つが測定されるが、ＮａＣｌＯ２は測定されない。
　ＤＰＤ法（遊離塩素）では、ＮａＣｌＯのみが測定され、無機系殺菌剤（ＮａＣｌＯ＋ＮＨ４Ｂｒ）とＮａＣｌＯ２は測定されない。
　ヨウ素滴定法（ＪＩＳＫ０１０１）では、ＮａＣｌＯ、無機系殺菌剤（ＮａＣｌＯ＋ＮＨ４Ｂｒ）、ＮａＣｌＯ２のすべてを測定できる。
　以上より、試料水中の各薬剤濃度の算出は以下のとおり実施した。
　　ＮａＣｌＯ濃度＝ＤＰＤ法(遊離塩素)で測定された残留塩素濃度
　　無機系殺菌剤（ＮａＣｌＯ＋ＮＨ４Ｂｒ）濃度
　　　　＝ＤＰＤ法(全塩素)で測定された残留塩素濃度
　　　　　　　　　－ＤＰＤ法（遊離塩素)で測定された残留塩素濃度
　　ＮａＣｌＯ２濃度
　　　　＝ヨウ素滴定法（ＪＩＳＫ０１０１）で測定された残留塩素濃度
　　　　　　　　　－ＤＰＤ法(全塩素)で測定された残留塩素濃度 The residual chlorine concentration was measured by the DPD method (total chlorine), DPD method (free chlorine), and iodine titration method (JIS K0101).
In the DPD method (total chlorine), NaClO and (NaClO + NH 4 Br) are measured, but NaClO 2 is not measured.
In the DPD method (free chlorine), only NaClO is measured, and inorganic fungicides (NaClO + NH 4 Br) and NaClO 2 are not measured.
In the iodine titration method (JISK0101), all of NaClO, an inorganic fungicide (NaClO + NH 4 Br), and NaClO 2 can be measured.
From the above, calculation of each drug concentration in the sample water was performed as follows.
NaClO concentration = Residual chlorine concentration measured by DPD method (free chlorine) Inorganic disinfectant (NaClO + NH 4 Br) concentration = Residual chlorine concentration measured by DPD method (total chlorine)-Measured by DPD method (free chlorine) Residual chlorine concentration NaClO 2 concentration = Residual chlorine concentration measured by iodine titration method (JISK0101)-Residual chlorine concentration measured by DPD method (total chlorine)
［実験例１（本発明例）］
　ＮａＣｌＯ２と無機系殺菌剤（ＮａＣｌＯ＋ＮＨ４Ｂｒ）のそれぞれを約５０ｍｇ／ＬａｓＣｌ２程度に希釈したものを等量混合した。混合後、１５分後の残留塩素濃度を測定し、結果を表１に示した。 [Experiment 1 (Invention)]
An equal amount of each of NaClO 2 and inorganic fungicide (NaClO + NH 4 Br) diluted to about 50 mg / LasCl 2 was mixed. After mixing, the residual chlorine concentration after 15 minutes was measured, and the results are shown in Table 1.
［実験例２（比較例）］
　ＮａＣｌＯ２の代りにＮａＣｌＯを用いた他は、実験例１と同様に混合を行って、残留塩素濃度の測定を行った。結果を表２に示す。 [Experimental example 2 (comparative example)]
The residual chlorine concentration was measured by mixing in the same manner as in Experimental Example 1 except that NaClO was used instead of NaClO 2 . The results are shown in Table 2.
Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000002
Figure JPOXMLDOC01-appb-T000002
　実験例１と実験例２の結果から明らかなように、ＮａＣｌＯと無機系殺菌剤（ＮａＯＣｌ＋ＮＨ４Ｂｒ）を混合した実験例２では、明らかに両薬剤が分解しているのに対して、ＮａＣｌＯ２と無機系殺菌剤（ＮａＯＣｌ＋ＮＨ４Ｂｒ）を混合した実験例１では両薬剤の分解は認められず、紙パルプ製造工程の水系に、次亜塩素酸塩ではなく、亜塩素酸（塩）を添加することにより、古紙を原料とする紙パルプ製造工程の分解を抑制することができることがわかる。 As is apparent from the results of Experimental Examples 1 and 2, in Experimental Example 2 in which NaClO and an inorganic fungicide (NaOCl + NH 4 Br) were mixed, both drugs were clearly decomposed, whereas NaClO 2 In Experimental Example 1 in which an inorganic disinfectant (NaOCl + NH 4 Br) was mixed, the decomposition of both chemicals was not observed, and chlorous acid (salt) was added instead of hypochlorite to the water system of the paper pulp manufacturing process. By doing so, it can be seen that the decomposition of the paper pulp manufacturing process using waste paper as a raw material can be suppressed.
［実験例３］
　以下の方法で、古紙原料を含むパルプスラリーに対する殺菌効果を評価した。
　脱墨古紙原料を１５重量％、ＬＢＫＰを７５重量％、損紙原料を１０重量％配合したパルプ濃度３重量％のパルプスラリーに対して、表３に示す薬剤を表３に示す濃度となるように添加混合した後、３０℃で３０分静置した。なお、酸化剤と無機系殺菌剤を併用する場合は、これらを同時に添加した。３０分静置後のスラリーを１／１０ｐＹ寒天培地に混合し、２日間、３０℃で静置培養した後、コロニー数を計測した。結果を表３に示す。
　また、酸化剤添加濃度毎の無機系殺菌剤（ＮａＣｌＯ＋ＮＨ４Ｂｒ）濃度と菌数との関係をグラフ化したものを図２に示した。 [Experiment 3]
The bactericidal effect on pulp slurry containing waste paper raw materials was evaluated by the following method.
The concentration of the chemicals shown in Table 3 is as shown in Table 3 with respect to the pulp slurry having a pulp concentration of 3% by weight containing 15% by weight of the deinked waste paper raw material, 75% by weight of LBKP, and 10% by weight of the waste paper raw material. Then, the mixture was allowed to stand at 30 ° C. for 30 minutes. In addition, when using together an oxidizing agent and an inorganic type germicide, these were added simultaneously. The slurry after standing for 30 minutes was mixed with 1/10 pY agar medium, and after standing still at 30 ° C. for 2 days, the number of colonies was counted. The results are shown in Table 3.
FIG. 2 is a graph showing the relationship between the concentration of the inorganic fungicide (NaClO + NH 4 Br) and the number of bacteria for each oxidizing agent addition concentration.
Figure JPOXMLDOC01-appb-T000003
Figure JPOXMLDOC01-appb-T000003
　表３及び図２より、無機系殺菌剤（ＮａＣｌＯ＋ＮＨ４Ｂｒ）を単独で添加する、あるいはＮａＣｌＯと無機系殺菌剤（ＮａＣｌＯ＋ＮＨ４Ｂｒ）を併用した場合よりも、ＮａＣｌＯ２と無機系殺菌剤（ＮａＣｌＯ＋ＮＨ４Ｂｒ）を併用した場合の方が、特に無機系殺菌剤添加量の低い領域において、高い殺菌効果が得られており、亜塩素酸（塩）による無機系殺菌剤の分解抑制効果が、次亜塩素酸塩よりも優れていることが分かる。 From Table 3 and FIG. 2, NaClO 2 and the inorganic germicide (NaClO + NH) are more effective than the case where the inorganic germicide (NaClO + NH 4 Br) is added alone or NaClO and the inorganic germicide (NaClO + NH 4 Br) are used in combination. In the case of using 4 Br) in combination, a high bactericidal effect is obtained particularly in a region where the amount of inorganic bactericides added is low, and the effect of inhibiting the decomposition of inorganic bactericides by chlorous acid (salt) is as follows. It turns out that it is superior to chlorite.
　本発明を特定の態様を用いて詳細に説明したが、本発明の意図と範囲を離れることなく様々な変更が可能であることは当業者に明らかである。
　なお、本出願は、２０１２年３月２７日付で出願された日本特許出願（特願２０１２－０７１８１０）に基づいており、その全体が引用により援用される。 Although the present invention has been described in detail using specific embodiments, it will be apparent to those skilled in the art that various modifications can be made without departing from the spirit and scope of the invention.
This application is based on a Japanese patent application filed on March 27, 2012 (Japanese Patent Application No. 2012-071810), which is incorporated by reference in its entirety.

Claims (7)

  1. 　古紙を原料とする紙パルプ製造工程の水系に、次亜塩素酸及び／又はその塩とアンモニウム塩から生成する無機系殺菌剤と、亜塩素酸及び／又はその塩とを添加することを特徴とする紙パルプ製造工程におけるスライムコントロール方法。 A feature is that an inorganic disinfectant produced from hypochlorous acid and / or a salt thereof and an ammonium salt, and chlorous acid and / or a salt thereof are added to an aqueous system in a paper pulp manufacturing process using waste paper as a raw material. The slime control method in the paper pulp manufacturing process.
  2. 　請求項１において、亜塩素酸及び／又はその塩を添加した後、次亜塩素酸及び／又はその塩とアンモニウム塩から生成する無機系殺菌剤を添加することを特徴とする紙パルプ製造工程におけるスライムコントロール方法。 In the paper pulp manufacturing process according to claim 1, wherein after adding chlorous acid and / or a salt thereof, an inorganic disinfectant produced from hypochlorous acid and / or a salt thereof and an ammonium salt is added. Slime control method.
  3. 　請求項１において、亜塩素酸及び／又はその塩を、次亜塩素酸及び／又はその塩とアンモニウム塩から生成する無機系殺菌剤の添加点よりも紙パルプ製造工程の上流側で添加することを特徴とする紙パルプ製造工程におけるスライムコントロール方法。 In Claim 1, chlorous acid and / or its salt are added in the upstream of a paper pulp manufacturing process rather than the addition point of the inorganic disinfectant produced | generated from hypochlorous acid and / or its salt, and ammonium salt. A slime control method in a paper pulp manufacturing process characterized by the above.
  4. 　請求項１ないし３のいずれか１項において、前記無機系殺菌剤がクロラミン及び／又はブロマミンであることを特徴とする紙パルプ製造工程におけるスライムコントロール方法。 The slime control method in a paper pulp manufacturing process according to any one of claims 1 to 3, wherein the inorganic fungicide is chloramine and / or bromamine.
  5. 　請求項１ないし４のいずれか１項において、次亜塩素酸及び／又はその塩とアンモニウム塩とを、これらを添加した直後の水系の残留塩素濃度が、ＤＰＤ法による全塩素濃度の測定値として０．１～１０ｍｇ／Ｌ　ａｓＣｌ２となるような添加量で水系に添加することを特徴とする紙パルプ製造工程におけるスライムコントロール方法。 In any one of Claims 1 thru | or 4, hypochlorous acid and / or its salt, and ammonium salt, The residual chlorine concentration of the aqueous system immediately after adding these is used as a measured value of the total chlorine concentration by DPD method. A slime control method in a paper pulp manufacturing process, which is added to an aqueous system at an addition amount of 0.1 to 10 mg / L asCl 2 .
  6. 　請求項１ないし５のいずれか１項において、次亜塩素酸及び／又はその塩とアンモニウム塩とを、次亜塩素酸及び／又はその塩：アンモニウム塩＝１：１～３（ＣｌとＮのモル比）で混合して用いることを特徴とする紙パルプ製造工程におけるスライムコントロール方法。 The hypochlorous acid and / or a salt thereof and an ammonium salt according to any one of claims 1 to 5, wherein the hypochlorous acid and / or a salt thereof: ammonium salt = 1: 1 to 3 (of Cl and N A slime control method in a paper pulp manufacturing process, which is used by mixing at a molar ratio).
  7. 　請求項１ないし６のいずれか１項において、亜塩素酸及び／又はその塩を、ＪＩＳＫ０１０１に基づくヨウ素滴定法による測定値として０．１～５０ｍｇ／Ｌ　ａｓＣｌ２となるように水系に添加することを特徴とする紙パルプ製造工程におけるスライムコントロール方法。 7. The method according to claim 1, wherein chlorous acid and / or a salt thereof is added to an aqueous system so that a measured value by an iodine titration method based on JISK0101 is 0.1 to 50 mg / L asCl 2. A slime control method in a paper pulp manufacturing process characterized by the above.
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