WO2021251220A1 - Method for treating wastewater containing cyanogen compound and automatic control system for chemical for treating wastewater containing cyanogen compound - Google Patents

Method for treating wastewater containing cyanogen compound and automatic control system for chemical for treating wastewater containing cyanogen compound Download PDF

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WO2021251220A1
WO2021251220A1 PCT/JP2021/020891 JP2021020891W WO2021251220A1 WO 2021251220 A1 WO2021251220 A1 WO 2021251220A1 JP 2021020891 W JP2021020891 W JP 2021020891W WO 2021251220 A1 WO2021251220 A1 WO 2021251220A1
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wastewater
treatment
cyanide
cyanide compound
chemical
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PCT/JP2021/020891
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French (fr)
Japanese (ja)
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理奈 濱
暁 勝本
啓司 武谷
一之 入佐
拓海 後藤
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株式会社片山化学工業研究所
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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
    • C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved compounds

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  • the present invention relates to a wastewater treatment method containing a cyanide compound and an automatic control system for a drug for treating wastewater containing a cyanide compound.
  • Cyan has a strong adverse effect on the ecosystem, so cyan-containing wastewater (hereinafter referred to as "cyan wastewater”) cannot be released into the natural world as it is.
  • Wastewater standards have been established for cyanide, and cyanide is removed so as to meet this standard (1 mg / l or less), and only detoxified wastewater can be discharged into sewage.
  • the cyanide compound exists in the wastewater in three forms of a persistent cyanide complex, a easily decomposable cyanide complex and a cyanide ion, although the content thereof varies depending on the origin of the wastewater.
  • the supply compound of, for example, ferrous sulfate is added to generate a sparingly soluble ferri / ferrocyanide, and the dark blue method is used to remove the precipitate.
  • Insoluble complex methods such as the zinc white method for precipitating and removing the complex and the reduced copper salt method for precipitating and removing the generated insoluble complex by adding a divalent copper salt and a reducing agent; (7) for cyanide.
  • Biological treatment method in which cyanide is decomposed by acclimatized microorganisms (cyan-degrading bacteria); (8) Cyan-containing wastewater is kept at a high temperature to hydrolyze cyan compounds to ammonia and formic acid, and coexisting heavy metals are used alone or as oxides.
  • Patent Documents 1 to 3 also disclose various chemicals used for wastewater treatment containing a cyanide compound, and disclose a method for treating wastewater containing a cyanide compound using these agents.
  • a cyanide-containing wastewater treatment method in which the type of chemical used for removing the cyanide compound in the wastewater and the amount of the chemical added are adjusted according to the type and concentration of the cyanide compound in the wastewater. ing.
  • the cyanide in the wastewater is analyzed by manually sampling from the wastewater before the treatment, it takes time and manpower to feed back the analysis result of the cyanide in the wastewater to the actual wastewater treatment. There was a loss of time. Therefore, it is not possible to perform wastewater treatment without causing time loss according to the analysis result of the cyanide compound in the wastewater, and even when analyzing the cyanide compound in the wastewater, it is necessary to add a surplus chemical. rice field.
  • Patent Document 4 in order to measure the concentration of suspended solids in wastewater containing suspended solids, a scale dispersant is added to the separated raw water, and then the raw water and the sensor are brought into contact with each other. It is disclosed to measure the quality of raw water.
  • this document only discloses that a dispersant is added in order to eliminate the defect caused by the suspended solid to be measured, and the cyanide in the wastewater containing the suspended solid and the cyanide is used. No processing method is disclosed.
  • Japanese Unexamined Patent Publication No. 2001-300353 Japanese Unexamined Patent Publication No. 2014-11254 Japanese Unexamined Patent Publication No. 2017-80699 Japanese Unexamined Patent Publication No. 2017-047361
  • An object of the present invention is to provide a method for treating wastewater containing a cyanide compound, which can timely reflect information on the cyanide compound in the wastewater containing suspended solids, without causing a malfunction of the analyzer in the long term.
  • the present inventors present the cyanide compound contained in the suspended solids in the waste water in a single form and / or in a form adsorbed on the suspended solids, and the suspended solids are removed. Focusing on the fact that more accurate information on suspended solids can be obtained by analyzing cyan compounds in waste water that has not been used, without removing suspended solids from waste water containing suspended solids and cyan compounds. As a result of diligently studying a method for preventing a malfunction of the analyzer, it was found that by adding a dispersant to the waste water introduced into the analyzer, the malfunction of the analyzer does not occur in the long term, and the present invention has been developed. It came to be completed.
  • the present invention has an analysis step of analyzing a cyanide contained in wastewater containing a suspended substance and a treatment step of adding a chemical to the wastewater to treat the cyanide, and the analysis step Based on the cyanide compound information in the generated wastewater, the type of the drug used in the treatment step and / or the amount of the drug used is determined, and a dispersant is added to the wastewater introduced in the analysis step. It is a method for treating wastewater containing a cyanide compound.
  • the analysis step it is preferable to analyze the cyanide compound contained in the wastewater containing a suspended solid without directly contacting the wastewater with the sensor.
  • the cyanide compound is preferably contained in wastewater in a single form or in a form adsorbed on a suspended solid.
  • the waste water is preferably waste water generated from a steel mill, a chemical factory, a plating factory, a coke manufacturing factory or a metal surface treatment factory.
  • the dispersant is preferably at least one selected from the group consisting of (meth) acrylic acid-based polymers, maleic acid-based polymers, phosphonic acid-based compounds and derivatives thereof.
  • the analysis steps are preferably performed at intervals of 6 hours or less.
  • the wastewater treatment method of the present invention further includes a post-treatment wastewater measurement step of measuring the amount of cyanide compound contained in the post-treatment wastewater obtained from the above treatment step, and the amount of chemicals used in the treatment step is determined by the treatment. It is preferable to make adjustments based on the information on the post-treatment wastewater generated in the post-wastewater measurement step.
  • the analysis step and the treatment step are automatically performed, and when the wastewater measurement step is further provided, the analysis step, the treatment step and the post-treatment wastewater measurement step are performed. Is preferably performed automatically.
  • the present invention comprises an analysis means for analyzing a cyanide compound contained in wastewater containing a suspended substance, a dispersant addition means for adding a dispersant to the wastewater introduced into the analysis means, and a chemical agent for the wastewater. And / or an agent for determining the type of the agent used in the treatment means and / or the amount of the agent used based on the cyanide information generated by the analysis means. Also in an automatic control system for a drug for treating wastewater containing a cyanide compound, which comprises a control means and automatically controls the type of the drug used in the treatment means and / or the amount of the drug used. be.
  • the present invention it is possible to provide a method for treating wastewater containing a cyanide compound, which can timely reflect information on the cyanide compound in the wastewater containing a suspended solid without causing a malfunction of the analyzer for a long period of time. Further, according to the present invention, it is possible to provide a method for treating wastewater containing a cyanide compound, which can automatically treat a cyanide compound in wastewater containing a suspended solid. Further, according to the present invention, it is possible to provide an automatic control system for a drug for treating wastewater containing a cyanide compound.
  • the method of the present invention is long-desired in the technical field to which the present invention belongs, and is suitable for the type and / or the amount of the chemical used for treating the cyanide compound in wastewater, and the wastewater treatment. It is extremely useful in industry because it can be automated.
  • XY means "X or more, Y or less”.
  • the method for treating cyanide containing a cyanide of the present invention comprises an analysis step of analyzing the cyanide contained in the wastewater containing a suspended substance and a treatment step of adding a chemical to the wastewater to treat the cyanide. Based on the cyanide compound information in the wastewater generated in the analysis step, the type of the drug and / or the amount of the drug used in the treatment step is determined and introduced into the analysis step. It is characterized by adding a dispersant to wastewater.
  • cyan compound information (type and / or concentration of cyan compound) in wastewater containing suspended solids and cyan compounds can be obtained without causing a malfunction of the analyzer due to the suspended solids. Therefore, it is possible to carry out wastewater treatment that reflects the cyan compound information in the wastewater generated in the above analysis step in a timely manner. Therefore, it is possible to optimize the type of the drug and the amount of the drug used in the above treatment step.
  • the analysis step of the present invention is a step having at least the measurement of the cyanide compound concentration or the analysis of the type of cyanide as the cyanide compound information in the waste water, and is a step including the measurement of the concentration of the cyanide compound and the analysis of the type of the cyanide compound. May be.
  • a cyanide compound in waste water is used by an analysis method and analysis means generally used in the technical field to which the present invention belongs (for example, Yanaco Technical Science Co., Ltd. - TCN automatic measuring device (TCN-508)).
  • the method for measuring cyanide is defined by JIS (official method), and the distillation operation is performed at pH 2 or less to measure total cyanide (JIS K0102 38.1.2). Therefore, in the above analysis step, it is preferable to analyze the cyanide compound in the wastewater by using a method or an apparatus based on this.
  • the analysis means used in the analysis step may be of a type in which the wastewater is in direct contact with the sensor, but a type in which the wastewater is not in direct contact with the sensor is preferable.
  • a known method for treating cyanide-containing wastewater can be used, and as the chemical used in the above treatment step, a chemical generally used in the treatment of cyanide-containing wastewater can be used.
  • the cyanide compound contained in the wastewater is treated with a chemical agent, but the method for allowing the chemical agent to exist in the wastewater is not particularly limited, and a commonly used method for adding a chemical agent can be used. ..
  • the two or more kinds of drugs may be added at the same time or may be added separately. Further, existing equipment may be used for adding the chemicals used in the above treatment step.
  • the cyanide compound contained in the wastewater treated by the wastewater treatment method of the present invention is a cyanide compound such as a cyanide ion or a cyanide complex.
  • the chemicals used in the treatment step are not limited, but for example, when the cyanide compound in the waste water is cyanide ion, sodium hypochlorite, chlorine dioxide, hydrogen peroxide, formalin
  • cyanide compound in the waste water is complex cyanide, a copper compound, an iron compound, a manganese compound and the like can be mentioned.
  • the amount of the chemical used in the treatment step (that is, the amount of the chemical added and present in the wastewater containing the cyanide) is based on the cyanide compound information in the wastewater generated in the analysis step. It will be decided.
  • the type and / or amount of the chemical used in the treatment step is based on the cyanide compound information contained in the wastewater, the wastewater amount, other content information contained in the wastewater, wastewater standards, and the like. It may be decided.
  • the other content information contained in the wastewater may be information measured in advance, or may be information measured at the same time as the analysis of the cyanide compound in the analysis step.
  • the type and / or amount of the chemical used in the treatment step can be determined based on the cyanide compound information in the wastewater, so that the type of cyanide is 2.
  • Wastewater that is more than a seed can be treated more preferably.
  • the wastewater treatment method of the present invention can more preferably treat wastewater in which the concentration of the cyanide compound changes with the passage of time.
  • the wastewater treated by the wastewater treatment method of the present invention contains suspended solids, and the concentration of suspended solids is not particularly limited.
  • the suspended solid for example, metals such as iron oxide and iron, and carbon powder can be considered.
  • the dispersant used in the wastewater treatment method of the present invention is not particularly problematic as long as it is a known dispersant, and for example, a (meth) acrylic acid-based polymer, a maleic acid-based polymer, or a phosphonic acid-based compound. And at least one selected from the group consisting of these derivatives.
  • the dispersant is preferably at least one selected from the group consisting of poly (meth) acrylic acid, polymaleic acid, phosphonic acid compounds and derivatives thereof.
  • (meth) acrylic means that both acrylic and methacryl are included.
  • the amount of the dispersant added is not particularly limited, and is preferably determined as appropriate according to the concentration of the suspended solid contained in the wastewater. For example, it is preferable to add 1 mg / L or more to the wastewater, more preferably 1 to 20 mg / L, and even more preferably 1 to 5 mg / L.
  • the cyanide compound contained in the wastewater treated by the treatment method of the present invention is preferably contained in the wastewater in a single form or in a form adsorbed on a suspended solid. According to the wastewater treatment method of the present invention, even if the wastewater contains a suspended solid, the cyanide compound in the wastewater can be analyzed without causing a problem in the analyzer, so that the form adsorbed by the suspended solid is formed. It is possible to analyze the cyanide in wastewater more accurately without removing the cyanide contained in the wastewater. Therefore, the method for treating wastewater containing a cyanide compound of the present invention can suitably treat wastewater containing a cyanide compound in a single form or in a form adsorbed on a suspended solid.
  • the content of the cyanide compound in the wastewater is not particularly limited, but the wastewater having a total cyanide concentration of 0.5 to 30 mg / L can be suitably treated, and the total cyanide concentration is 1 to 20 mg / L. Wastewater can be treated more favorably.
  • the wastewater containing a cyan compound is discharged in the treatment process of waste water containing a cyan compound and radioactively contaminated water discharged from an iron manufacturing factory, a chemical factory, a plating factory, a coke manufacturing factory, a metal surface treatment factory and the like.
  • Examples include wastewater containing cyanide compounds and wastewater containing cyanide compounds discharged from soil treatment equipment.
  • the method for treating wastewater containing a cyan compound of the present invention is contained in wastewater generated from a steel mill, a chemical factory, a plating factory, a coke manufacturing factory or a metal surface treatment factory, that is, wastewater containing a suspended substance having the above concentration. Suitable for treating cyanide compounds.
  • the analysis step is preferably carried out at intervals of 6 hours or less, more preferably at intervals of 4 hours or less, and even more preferably at intervals of 3 hours or less. Further, it is most preferable that the analysis step is continuously analyzed. As used herein, continuous analysis means that the analysis is performed within 120 minute intervals. This is because the type and / or concentration of the cyanide compound in the wastewater containing the cyanide compound changes from moment to moment, so that it is preferable to check it regularly, and it is more preferable to check it continuously. Further, the analysis step may be performed at intervals of 15 minutes or more or 30 minutes or more.
  • the wastewater treatment method of the present invention further includes a post-treatment wastewater measurement step of measuring the amount of cyanide compound contained in the post-treatment wastewater obtained from the above treatment step, and the amount of chemicals used in the above treatment step is used. It is preferable to make adjustments based on the information on the post-treatment wastewater generated in the above-mentioned post-treatment wastewater measurement step.
  • the above analysis step and the above treatment step are automatically performed. Further, it is preferable that the analysis step, the treatment step and the post-treatment wastewater measurement step are automatically performed. Furthermore, it is possible to make a system that displays and reports these data and controls via the Internet.
  • known agents such as rust preventives, corrosion inhibitors, slime control agents, metal trapping agents, and defoaming agents may be used in combination as long as the effects of the present invention are not impaired.
  • the treatment method of the present invention may be used in combination with a known physical cyan treatment method such as infrared rays or ultraviolet rays generally used in the present field as long as the effects of the present invention are not impaired.
  • the treatment method of the present invention may further include a treatment method (for example, solid-liquid separation treatment or the like) that is generally carried out after chemically treating wastewater containing a cyanide compound.
  • the method and apparatus generally used for the treatment method carried out after chemically treating the wastewater containing a cyanide compound are not particularly limited, and the generally used method and apparatus can be used.
  • known devices such as thickeners, clarifiers, and sedimentation basins can be used.
  • the present invention comprises an analysis means for analyzing a cyanide compound contained in wastewater containing a suspended substance, a dispersant addition means for adding a dispersant to the wastewater introduced into the analysis means, and a chemical agent for the wastewater. And / or an agent for determining the type of the agent used in the treatment means and / or the amount of the agent used based on the cyanide information generated by the analysis means. Also in an automatic control system for a drug for treating wastewater containing a cyanide compound, which comprises a control means and automatically controls the type of the drug used in the treatment means and / or the amount of the drug used. be.
  • the automatic control system of the present invention can be the same as the above-described aspect of the processing method of the present invention, and the preferred embodiment of the above-mentioned processing method of the present invention may be similarly suitable.
  • the above-mentioned description of the processing method of the present invention is also a description of the system of the present invention, and can be adopted as a description of the automatic control system of the present invention.
  • FIG. 1 shows an embodiment of the present invention, but the present invention is not limited to the present embodiment.
  • a chemical is added to wastewater (raw water) containing a suspended solid and a cyanide compound, and the treatment tank 1 for treating the cyanide compound and the analysis tank 1 before being introduced into the treatment tank 1 are analyzed.
  • An analytical means 2 is shown in which the wastewater (raw water) before the treatment is introduced into the analysis means that is separated into the line.
  • the dispersant in the dispersant tank 7 is added to the raw water introduced into the analysis means 2 by the dispersant adding means 4.
  • the cyanide compound information generated by the analysis means 2 is sent to the drug control means, and the drug control means determines the type and / or the amount of the drug to be added to the treatment tank 1 based on the cyanide compound information. Then, the information determined by the drug control means is sent to the drug addition means 3, 3'.
  • the processing means in the system of the present invention are the processing tank 1, the drug adding means 3, 3'and the drug tanks 6, 6'in FIG. 1, but are not limited to this embodiment. Further, the drug tank and the drug adding means are not limited to the form shown in FIG. 1, and can be appropriately changed depending on the type of the drug used and the method of adding the drug.
  • FIG. 1 shows a post-treatment wastewater measuring means 5 for separating and measuring the treated wastewater.
  • the position of the flow meter (FM) shown in FIG. 1 may be installed before the wastewater (raw water) branches to the analysis line. Further, although not shown in FIG. 1, the wastewater that has passed through the analysis means 2 may be returned to the raw water or may be introduced into the treatment tank 1.
  • the drug control means in the automatic control system of the present invention is based on the cyanide compound information contained in the wastewater, the wastewater amount information, other content information contained in the wastewater, wastewater standards, etc., and the type and / or use of the drug.
  • the amount can be determined.
  • the other content information contained in the wastewater may be preset information or information measured at the same time as the analysis of the cyanide compound in the analysis step. Further, the wastewater amount information may be preset information or may be a value measured by a flow meter of raw water.
  • the system of the present invention may include other configurations for each of the above means to be preferably carried out.
  • the treatment means may have a mixing means for mixing the drug, or may have a pH measuring means or a temperature measuring means for measuring the pH of the waste liquid being treated. , May have heating means.
  • a known solid-liquid separation device such as a thickener, a clarifier, or a settling basin can be used, and the existing device may be diverted.
  • Treatment tank 2 Analytical means 3, 3'Chemical addition means 4 Dispersant addition means 5 Post-treatment wastewater measuring means 6, 6'Chemical tank 7 Dispersant tank

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Abstract

The purpose of the present invention is to provide a method for treating wastewater containing a cyanogen compound, said method being capable of timely reflecting the information about the cyanogen compound in wastewater that contains a suspended substance without causing a failure of an analyzer in the long term. The present invention relates to a method for treating wastewater containing a cyanogen compound, said method being characterized by comprising an analysis step for analyzing a cyanogen compound in wastewater that contains a suspended substance and a treatment step for treating the cyanogen compound by adding a chemical into the wastewater. This method is also characterized in that: the kind of the chemical and/or the amount of the chemical to be used in the treatment step is determined on the basis of the information about the cyanogen compound in the wastewater, said information is achieved in the analysis step; and a dispersant is added to the wastewater that is introduced into the analysis step.

Description

シアン化合物を含む廃水処理方法、シアン化合物を含む廃水を処理するための薬剤の自動制御システムWastewater treatment method containing cyanide, automatic control system of chemicals for treating wastewater containing cyanide
　本発明は、シアン化合物を含む廃水処理方法及びシアン化合物を含む廃水を処理するための薬剤の自動制御システムに関する。 The present invention relates to a wastewater treatment method containing a cyanide compound and an automatic control system for a drug for treating wastewater containing a cyanide compound.
　シアンは生態系に強い悪影響を及ぼすため、シアン含有廃水（以下、「シアン廃水」という）を自然界にそのまま放出することはできない。シアンについては排水基準が定められており、この基準（１ｍｇ／ｌ以下）を満たすようにシアンの除去処理を行い、無害化した廃水でなければ下水などに排出できないことになっている。また、シアン化合物は、廃水の由来にも因り、含有量の多少はあるが、難分解性シアン錯体、易分解性シアン錯体およびシアン化物イオンの３種の形態で廃水中に存在している。 Cyan has a strong adverse effect on the ecosystem, so cyan-containing wastewater (hereinafter referred to as "cyan wastewater") cannot be released into the natural world as it is. Wastewater standards have been established for cyanide, and cyanide is removed so as to meet this standard (1 mg / l or less), and only detoxified wastewater can be discharged into sewage. Further, the cyanide compound exists in the wastewater in three forms of a persistent cyanide complex, a easily decomposable cyanide complex and a cyanide ion, although the content thereof varies depending on the origin of the wastewater.
　従来からシアン含有廃水中のシアンの除去処理として様々な方法が提案され、実用化されているが、いずれも一長一短があり、廃水の状況に応じて使い分けられている。
　例えば、（１）シアン含有廃水をアルカリ性に調整した後、塩素を注入してシアンを酸化分解するアルカリ塩素法、（２）強力なオゾンの酸化力でシアンを窒素ガスと炭酸水素塩に酸化分解するオゾン酸化法および（３）非溶解性の電極を用いてシアンを電気分解し、酸化反応を行なう電解酸化法（電解法）などの酸化分解法；（４）シアン含有廃水中に、鉄イオンの供給化合物として、例えば硫酸第一鉄を添加し、難溶性のフェリ／フェロシアン化物を生成させ、これを沈殿除去する紺青法、（５）塩化亜鉛と還元剤とを添加し、生成した不溶錯体を沈殿除去する亜鉛白法および（６）２価の銅塩と還元剤とを添加し、生成した不溶錯体を沈殿除去する還元銅塩法などの不溶錯体法；（７）シアンに対して馴養させた微生物（シアン分解菌）にシアンを分解させる生物処理法；（８）シアン含有廃水を高温に保持してシアン化合物をアンモニアと蟻酸に加水分解させ、共存する重金属類を単体または酸化物として析出させる熱加水分解法および（９）シアンの分解以外に有機汚濁物をも酸化分解させる湿式酸化法などの熱水反応などがある。そのため、シアン含有廃水中のシアンの除去処理には様々な薬剤が、廃水の状況に応じて使い分けられていた。 Various methods have been proposed and put into practical use for removing cyanide from cyanide-containing wastewater, but all of them have advantages and disadvantages, and they are used properly according to the situation of wastewater.
For example, (1) the alkaline chlorine method in which cyanide-containing wastewater is adjusted to alkaline and then chlorine is injected to oxidatively decompose cyanide, and (2) cyanide is oxidatively decomposed into nitrogen gas and hydrogen carbonate by the strong oxidizing power of ozone. Oxidation method such as ozone oxidation method and (3) electrolytic oxidation method (electrolytic method) that electrolyzes cyan using an insoluble electrode to perform an oxidation reaction; (4) iron ions in cyan-containing wastewater. As the supply compound of, for example, ferrous sulfate is added to generate a sparingly soluble ferri / ferrocyanide, and the dark blue method is used to remove the precipitate. Insoluble complex methods such as the zinc white method for precipitating and removing the complex and the reduced copper salt method for precipitating and removing the generated insoluble complex by adding a divalent copper salt and a reducing agent; (7) for cyanide. Biological treatment method in which cyanide is decomposed by acclimatized microorganisms (cyan-degrading bacteria); (8) Cyan-containing wastewater is kept at a high temperature to hydrolyze cyan compounds to ammonia and formic acid, and coexisting heavy metals are used alone or as oxides. There are hot water reactions such as a thermal hydrolysis method for precipitating and (9) a wet oxidation method for oxidatively decomposing organic pollutants in addition to the decomposition of cyanide. Therefore, various chemicals have been used properly for the removal treatment of cyanide in the cyanide-containing wastewater according to the condition of the wastewater.
　特許文献１～３にもシアン化合物を含む廃水処理に用いられる種々の薬剤が開示され、これらを用いたシアン化合物を含む廃水の処理方法が開示されている。 Patent Documents 1 to 3 also disclose various chemicals used for wastewater treatment containing a cyanide compound, and disclose a method for treating wastewater containing a cyanide compound using these agents.
　また、廃水中のシアン化合物の濃度は時々刻々と変化するものであることが知られている。しかし、廃水中に含まれるシアン化合物の濃度に応じて、上述のような廃水処理に用いられる薬剤の添加量を都度変化させることは現実的ではないため、シアン化合物の処理においては過剰量の薬剤が添加されることがある。しかし、シアン含有廃水はその排出量が多い為、薬剤を過剰に添加すると薬剤コストが増加するという問題があった。また、薬剤の添加量を一定量に固定すると、廃水中のシアン化合物の種類や濃度の変化により適切な処理が施されず、シアン含有廃水を排水する工場そのものの操業が停止する事態を招くこともあった。 It is also known that the concentration of cyanide in wastewater changes from moment to moment. However, since it is not realistic to change the amount of the chemical used for the wastewater treatment as described above according to the concentration of the cyanide contained in the wastewater each time, it is not realistic to change the amount of the chemical used in the treatment of the cyanide. May be added. However, since the amount of cyanide-containing wastewater discharged is large, there is a problem that the cost of the chemical increases when the chemical is excessively added. In addition, if the amount of chemicals added is fixed at a certain amount, appropriate treatment will not be performed due to changes in the type and concentration of cyanide compounds in the wastewater, leading to a situation in which the operation of the factory itself that drains cyanide-containing wastewater is stopped. There was also.
　そのため、廃水中のシアン化合物の種類や濃度に応じて、廃水中のシアン化合物の除去処理に用いられる薬剤の種類や薬剤添加量を調整するシアン含有廃水の処理方法が採用される場面が多くなっている。しかし、人の手により処理前の廃水からサンプリングを行い該廃水中のシアン化合物の分析をすると、時間と人手とを要して廃水中のシアン化合物の分析結果を現実の廃水処理にフィードバックするまで時間のロスが生じていた。そのため、廃水中のシアン化合物の分析結果に応じて時間ロスを生じることなく廃水処理を行うことができず、廃水中のシアン化合物を分析する場合であっても、余剰薬剤を添加する必要があった。 Therefore, there are many cases where a cyanide-containing wastewater treatment method is adopted in which the type of chemical used for removing the cyanide compound in the wastewater and the amount of the chemical added are adjusted according to the type and concentration of the cyanide compound in the wastewater. ing. However, when the cyanide in the wastewater is analyzed by manually sampling from the wastewater before the treatment, it takes time and manpower to feed back the analysis result of the cyanide in the wastewater to the actual wastewater treatment. There was a loss of time. Therefore, it is not possible to perform wastewater treatment without causing time loss according to the analysis result of the cyanide compound in the wastewater, and even when analyzing the cyanide compound in the wastewater, it is necessary to add a surplus chemical. rice field.
　このため従来より、シアン化合物を含む廃水の処理について、廃水中のシアン化合物に対する分析結果を、時間ロスを生じることなく廃水処理に反映することができる廃水処理方法が望まれていた。しかし、シアン化合物を含む廃水に含まれる懸濁物質（ＳＳ分）は、ストレーナー等を用いて分離できるものではないため、分析装置を用いて廃水中のシアン化合物を分析すると、短期間で分析装置内に懸濁物質が蓄積するなどの不具合が生じていた。そのため、長期的に分析装置の不具合を生じることなく、廃水中のシアン化合物情報を適時反映できるシアン化合物を含む廃水の処理方法が求められている。また、シアン化合物の廃水処理は、人手を要するため自動化が望まれている。 Therefore, conventionally, regarding the treatment of wastewater containing a cyanide, a wastewater treatment method capable of reflecting the analysis result of the cyanide in the wastewater in the wastewater treatment without causing time loss has been desired. However, suspended solids (SS content) contained in wastewater containing cyan compounds cannot be separated using a strainer or the like. Therefore, when the cyan compounds in the wastewater are analyzed using an analyzer, the analyzer can be used in a short period of time. There was a problem such as the accumulation of suspended solids inside. Therefore, there is a demand for a wastewater treatment method containing a cyanide compound that can timely reflect cyanide compound information in the wastewater without causing a malfunction of the analyzer in the long term. In addition, since the wastewater treatment of cyanide requires manpower, automation is desired.
　なお、例えば、特許文献４には、懸濁物質を含む廃水の懸濁物質濃度を測定するために、分取された原水にスケール分散剤を添加し、その後、該原水とセンサーとを接触させて原水の水質を測定することが開示されている。しかしながら、本文献には、測定対象である懸濁物質により生じる不具合を解消するために分散剤を添加することが開示されているのみであり、懸濁物質とシアン化合物を含む廃水におけるシアン化合物の処理方法に関しては何ら開示されていない。 For example, in Patent Document 4, in order to measure the concentration of suspended solids in wastewater containing suspended solids, a scale dispersant is added to the separated raw water, and then the raw water and the sensor are brought into contact with each other. It is disclosed to measure the quality of raw water. However, this document only discloses that a dispersant is added in order to eliminate the defect caused by the suspended solid to be measured, and the cyanide in the wastewater containing the suspended solid and the cyanide is used. No processing method is disclosed.
特開２００１－３００５５３号公報Japanese Unexamined Patent Publication No. 2001-300353 特開２０１４－１１１２５４号公報Japanese Unexamined Patent Publication No. 2014-11254 特開２０１７－８０６９９号公報Japanese Unexamined Patent Publication No. 2017-80699 特開２０１７－０４７３６１号公報Japanese Unexamined Patent Publication No. 2017-047361
　本発明は、長期的に分析装置の不具合を生じることなく、懸濁物質を含有する廃水中のシアン化合物情報を適時反映できるシアン化合物を含む廃水の処理方法を提供することを課題とする。 An object of the present invention is to provide a method for treating wastewater containing a cyanide compound, which can timely reflect information on the cyanide compound in the wastewater containing suspended solids, without causing a malfunction of the analyzer in the long term.
　本発明者らは、懸濁物質を含有する廃水に含まれるシアン化合物は、該廃水中で、単独形態及び／又は懸濁物質に吸着された形態でも存在しており、懸濁物質が除去されていない廃水中のシアン化合物を分析することで、より正確に廃水中のシアン化合物情報が得られることに着目し、懸濁物質とシアン化合物とを含む廃水から懸濁物質を除去することなく、分析装置に不具合を生じさせないための方法を鋭意検討した結果、分析装置に導入される上記廃水に分散剤を添加することで、長期的に分析装置の不具合が発生しないことを見出し、本発明を完成させるに至った。 The present inventors present the cyanide compound contained in the suspended solids in the waste water in a single form and / or in a form adsorbed on the suspended solids, and the suspended solids are removed. Focusing on the fact that more accurate information on suspended solids can be obtained by analyzing cyan compounds in waste water that has not been used, without removing suspended solids from waste water containing suspended solids and cyan compounds. As a result of diligently studying a method for preventing a malfunction of the analyzer, it was found that by adding a dispersant to the waste water introduced into the analyzer, the malfunction of the analyzer does not occur in the long term, and the present invention has been developed. It came to be completed.
　すなわち、本発明は、懸濁物質を含有する廃水に含まれるシアン化合物を分析する分析工程と、上記廃水に薬剤を添加して上記シアン化合物を処理する処理工程とを有し、上記分析工程で生成された上記廃水中のシアン化合物情報に基づいて上記処理工程で使用される上記薬剤の種類及び／又は上記薬剤の使用量を決定し、上記分析工程に導入される上記廃水に分散剤を添加することを特徴とするシアン化合物を含む廃水の処理方法である。
　上記分析工程は、懸濁物質を含有する廃水に含まれるシアン化合物を、上記廃水とセンサーとを直接接触させずに分析することが好ましい。
　シアン化合物は、廃水中に単独形態及び懸濁物質に吸着された形態で含まれていることが好ましい。
　廃水は、製鉄所、化学工場、メッキ工場、コークス製造工場又は金属表面処理工場から生じる廃水であることが好ましい。
　分散剤は（メタ）アクリル酸系重合物、マレイン酸系重合物、ホスホン酸系化合物及びこれらの誘導体からなる群より選択される少なくとも１種であることが好ましい。
　分析工程は、６時間以内の間隔で実施されることが好ましい。
　本発明の廃水の処理方法は、上記処理工程から得られる処理後排水に含まれるシアン化合物量を測定する処理後排水測定工程をさらに含み、処理工程で使用される薬剤の使用量を、前記処理後排水測定工程で生成された処理後排水の情報に基づいて調整することが好ましい。
　本発明の廃水の処理方法は、上記分析工程及び上記処理工程が自動で行われることが好ましく、さらに処理後排水測定工程を有する場合は、上記分析工程、上記処理工程及び上記処理後排水測定工程が自動で行われることが好ましい。 That is, the present invention has an analysis step of analyzing a cyanide contained in wastewater containing a suspended substance and a treatment step of adding a chemical to the wastewater to treat the cyanide, and the analysis step Based on the cyanide compound information in the generated wastewater, the type of the drug used in the treatment step and / or the amount of the drug used is determined, and a dispersant is added to the wastewater introduced in the analysis step. It is a method for treating wastewater containing a cyanide compound.
In the analysis step, it is preferable to analyze the cyanide compound contained in the wastewater containing a suspended solid without directly contacting the wastewater with the sensor.
The cyanide compound is preferably contained in wastewater in a single form or in a form adsorbed on a suspended solid.
The waste water is preferably waste water generated from a steel mill, a chemical factory, a plating factory, a coke manufacturing factory or a metal surface treatment factory.
The dispersant is preferably at least one selected from the group consisting of (meth) acrylic acid-based polymers, maleic acid-based polymers, phosphonic acid-based compounds and derivatives thereof.
The analysis steps are preferably performed at intervals of 6 hours or less.
The wastewater treatment method of the present invention further includes a post-treatment wastewater measurement step of measuring the amount of cyanide compound contained in the post-treatment wastewater obtained from the above treatment step, and the amount of chemicals used in the treatment step is determined by the treatment. It is preferable to make adjustments based on the information on the post-treatment wastewater generated in the post-wastewater measurement step.
In the wastewater treatment method of the present invention, it is preferable that the analysis step and the treatment step are automatically performed, and when the wastewater measurement step is further provided, the analysis step, the treatment step and the post-treatment wastewater measurement step are performed. Is preferably performed automatically.
　また、本発明は、懸濁物質を含有する廃水に含まれるシアン化合物を分析する分析手段と、上記分析手段に導入される上記廃水に分散剤を添加する分散剤添加手段と、上記廃水に薬剤を添加して上記シアン化合物を処理する処理手段と、上記分析手段で生成されたシアン化合物情報に基づいて上記処理手段で使用される上記薬剤の種類及び／又は上記薬剤の使用量を決定する薬剤制御手段とを備え、上記処理手段で使用される上記薬剤の種類及び／又は上記薬剤の使用量を自動制御することを特徴とするシアン化合物を含む廃水を処理するための薬剤の自動制御システムでもある。 Further, the present invention comprises an analysis means for analyzing a cyanide compound contained in wastewater containing a suspended substance, a dispersant addition means for adding a dispersant to the wastewater introduced into the analysis means, and a chemical agent for the wastewater. And / or an agent for determining the type of the agent used in the treatment means and / or the amount of the agent used based on the cyanide information generated by the analysis means. Also in an automatic control system for a drug for treating wastewater containing a cyanide compound, which comprises a control means and automatically controls the type of the drug used in the treatment means and / or the amount of the drug used. be.
　本発明によれば、長期的に分析装置の不具合を生じることなく、懸濁物質を含有する廃水中のシアン化合物情報を適時反映できる、シアン化合物を含む廃水の処理方法を提供することができる。また、本発明によれば、懸濁物質を含有する廃水中のシアン化合物を、自動で処理できるシアン化合物を含む廃水の処理方法を提供することができる。また、本発明によれば、シアン化合物を含む廃水を処理するための薬剤の自動制御システムを提供することができる。よって、本発明の方法は、本発明の属する技術分野において長期的に望まれていた、廃水中のシアン化合物処理に用いられる薬剤の種類及び／又は薬剤の使用量の好適化、及び、廃水処理の自動化をかなえるものであるから、産業上極めて有用である。 According to the present invention, it is possible to provide a method for treating wastewater containing a cyanide compound, which can timely reflect information on the cyanide compound in the wastewater containing a suspended solid without causing a malfunction of the analyzer for a long period of time. Further, according to the present invention, it is possible to provide a method for treating wastewater containing a cyanide compound, which can automatically treat a cyanide compound in wastewater containing a suspended solid. Further, according to the present invention, it is possible to provide an automatic control system for a drug for treating wastewater containing a cyanide compound. Therefore, the method of the present invention is long-desired in the technical field to which the present invention belongs, and is suitable for the type and / or the amount of the chemical used for treating the cyanide compound in wastewater, and the wastewater treatment. It is extremely useful in industry because it can be automated.
本発明の一実施形態を説明する図である。It is a figure explaining one Embodiment of this invention.
　以下、本発明について詳細に説明するが、本発明は以下で説明する実施形態に限定されるものではない。 Hereinafter, the present invention will be described in detail, but the present invention is not limited to the embodiments described below.
　本明細書中、「Ｘ～Ｙ」は、「Ｘ以上、Ｙ以下」を意味する。 In this specification, "XY" means "X or more, Y or less".
　本発明のシアン化合物を含む廃水の処理方法は、懸濁物質を含有する廃水に含まれるシアン化合物を分析する分析工程と、上記廃水に薬剤を添加して上記シアン化合物を処理する処理工程とを有し、上記分析工程で生成された上記廃水中のシアン化合物情報に基づいて上記処理工程で使用される上記薬剤の種類及び／又は上記薬剤の使用量を決定し、上記分析工程に導入される廃水に分散剤を添加することを特徴とする。 The method for treating cyanide containing a cyanide of the present invention comprises an analysis step of analyzing the cyanide contained in the wastewater containing a suspended substance and a treatment step of adding a chemical to the wastewater to treat the cyanide. Based on the cyanide compound information in the wastewater generated in the analysis step, the type of the drug and / or the amount of the drug used in the treatment step is determined and introduced into the analysis step. It is characterized by adding a dispersant to wastewater.
本発明によると、懸濁物質及びシアン化合物を含有する廃水におけるシアン化合物情報（シアン化合物の種類及び／又は濃度）を、懸濁物質による分析装置の不具合を生じることなく得られるため、上記処理工程で、適時上記分析工程で生成された廃水中のシアン化合物情報を反映した廃水処理を実施することができる。よって、上記処理工程で用いられる薬剤の種類及び薬剤の量を最適化することができる。なお、本発明の分析工程は、廃水におけるシアン化合物情報として、少なくともシアン化合物濃度の測定又はシアン化合物の種類の分析を有する工程であり、シアン化合物の濃度測定及びシアン化合物の種類の分析を含む工程であってよい。 According to the present invention, cyan compound information (type and / or concentration of cyan compound) in wastewater containing suspended solids and cyan compounds can be obtained without causing a malfunction of the analyzer due to the suspended solids. Therefore, it is possible to carry out wastewater treatment that reflects the cyan compound information in the wastewater generated in the above analysis step in a timely manner. Therefore, it is possible to optimize the type of the drug and the amount of the drug used in the above treatment step. The analysis step of the present invention is a step having at least the measurement of the cyanide compound concentration or the analysis of the type of cyanide as the cyanide compound information in the waste water, and is a step including the measurement of the concentration of the cyanide compound and the analysis of the type of the cyanide compound. May be.
　上記分析工程では、本発明の属する技術分野において、一般的に用いられる分析方法及び分析手段（例えば、ヤナコテクニカルサイエンス社製－ＴＣＮ自動測定装置（ＴＣＮ－５０８）等）により、廃水中のシアン化合物を分析する。シアンの測定法はＪＩＳ（公定法）により定められており、ｐＨ２以下で蒸留操作を行い、全シアンを測定すること（ＪＩＳ　Ｋ０１０２　３８．１．２）となっている。よって、上記分析工程では、これを準拠する方法や装置を用いて廃水中のシアン化合物を分析することが好ましい。 In the above analysis step, a cyanide compound in waste water is used by an analysis method and analysis means generally used in the technical field to which the present invention belongs (for example, Yanaco Technical Science Co., Ltd. - TCN automatic measuring device (TCN-508)). To analyze. The method for measuring cyanide is defined by JIS (official method), and the distillation operation is performed at pH 2 or less to measure total cyanide (JIS K0102 38.1.2). Therefore, in the above analysis step, it is preferable to analyze the cyanide compound in the wastewater by using a method or an apparatus based on this.
　上記分析工程で用いられる分析手段は、上記廃水を直接センサーに接触させるタイプのものであってもよいが、上記廃水とセンサーとを直接接触させないタイプのものが好ましい。 The analysis means used in the analysis step may be of a type in which the wastewater is in direct contact with the sensor, but a type in which the wastewater is not in direct contact with the sensor is preferable.
　上記処理工程では、公知のシアン化合物含有廃水の処理方法を用いることができ、上記処理工程で使用される薬剤は、シアン化合物含有廃水の処理において一般的に使用される薬剤を用いることができる。上記処理工程では、上記廃水に含まれるシアン化合物が薬剤により処理されるが、上記廃水に上記薬剤を存在させる方法は特に限定されず、一般的に使用される薬剤の添加方法を用いることができる。また、上記処理工程において、２種以上の薬剤が用いられる場合、２種以上の薬剤は同時に添加されてもよく、また別々に添加されてもよい。また、上記処理工程で用いられる薬剤の添加には、既存の設備を用いてもよい。 In the above treatment step, a known method for treating cyanide-containing wastewater can be used, and as the chemical used in the above treatment step, a chemical generally used in the treatment of cyanide-containing wastewater can be used. In the treatment step, the cyanide compound contained in the wastewater is treated with a chemical agent, but the method for allowing the chemical agent to exist in the wastewater is not particularly limited, and a commonly used method for adding a chemical agent can be used. .. When two or more kinds of drugs are used in the above treatment step, the two or more kinds of drugs may be added at the same time or may be added separately. Further, existing equipment may be used for adding the chemicals used in the above treatment step.
　本発明の廃水の処理方法で処理される廃水に含まれるシアン化合物は、シアン化物イオン、シアン錯体等のシアン化合物である。上述の通り、上記処理工程で使用される薬剤は限定されるものではないが、例えば、上記廃水中のシアン化合物がシアン化物イオンの場合、次亜塩素酸ナトリウムや二酸化塩素、過酸化水素、ホルマリン等が挙げられ、上記廃水中のシアン化合物が錯シアンの場合、銅化合物、鉄化合物、マンガン化合物等が挙げられる。 The cyanide compound contained in the wastewater treated by the wastewater treatment method of the present invention is a cyanide compound such as a cyanide ion or a cyanide complex. As described above, the chemicals used in the treatment step are not limited, but for example, when the cyanide compound in the waste water is cyanide ion, sodium hypochlorite, chlorine dioxide, hydrogen peroxide, formalin When the cyanide compound in the waste water is complex cyanide, a copper compound, an iron compound, a manganese compound and the like can be mentioned.
　上記処理工程で使用される薬剤の使用量（すなわち、薬剤の添加量であって、シアン化合物を含む廃水中に存在させる量）は、上記分析工程で生成された廃水中のシアン化合物情報に基づき決定されるものである。また、上記処理工程で使用される薬剤の種類及び／又は使用量は、上記廃水に含まれるシアン化合物情報に加え、上記廃水量、上記廃水に含まれる他の含有情報及び排水基準等に基づいて決定されてもよい。上記廃水に含まれる他の含有情報は、予め測定された情報であってもよく、上記分析工程においてシアン化合物の分析と同時に測定された情報であってもよい。 The amount of the chemical used in the treatment step (that is, the amount of the chemical added and present in the wastewater containing the cyanide) is based on the cyanide compound information in the wastewater generated in the analysis step. It will be decided. The type and / or amount of the chemical used in the treatment step is based on the cyanide compound information contained in the wastewater, the wastewater amount, other content information contained in the wastewater, wastewater standards, and the like. It may be decided. The other content information contained in the wastewater may be information measured in advance, or may be information measured at the same time as the analysis of the cyanide compound in the analysis step.
　本発明の廃水の処理方法によれば、廃水中のシアン化合物情報に基づいて処理工程で使用される薬剤の種類及び／又は薬剤の使用量を決定することができるため、シアン化合物の種類が２種以上である廃水をより好適に処理することができる。また、本発明の廃水の処理方法は、シアン化合物の濃度が時間経過に伴い変化する廃水をより好適に処理することができる。 According to the wastewater treatment method of the present invention, the type and / or amount of the chemical used in the treatment step can be determined based on the cyanide compound information in the wastewater, so that the type of cyanide is 2. Wastewater that is more than a seed can be treated more preferably. In addition, the wastewater treatment method of the present invention can more preferably treat wastewater in which the concentration of the cyanide compound changes with the passage of time.
　本発明の廃水の処理方法で処理される廃水は、懸濁物質を含有するものであり、懸濁物質濃度は特に制限されるものではない。 The wastewater treated by the wastewater treatment method of the present invention contains suspended solids, and the concentration of suspended solids is not particularly limited.
　上記懸濁物質としては、例えば、酸化鉄や鉄等の金属類、および炭素紛が考えられる。 As the suspended solid, for example, metals such as iron oxide and iron, and carbon powder can be considered.
　本発明の廃水の処理方法に用いられる分散剤は、公知の分散剤であれば特に問題ないが、例えば、（メタ）アクリル酸系重合物（ポリマー）、マレイン酸系重合物、ホスホン酸系化合物及びこれらの誘導体からなる群より選択される少なくとも１種であることが好ましい。また、上記分散剤としては、ポリ（メタ）アクリル酸やポリマレイン酸、ホスホン酸系化合物及びこれらの誘導体からなる群より選択される少なくとも１種であることが好ましい。なお、本明細書において、「（メタ）アクリル」とは、アクリル及びメタクリルの両方が含まれることを意味する。 The dispersant used in the wastewater treatment method of the present invention is not particularly problematic as long as it is a known dispersant, and for example, a (meth) acrylic acid-based polymer, a maleic acid-based polymer, or a phosphonic acid-based compound. And at least one selected from the group consisting of these derivatives. The dispersant is preferably at least one selected from the group consisting of poly (meth) acrylic acid, polymaleic acid, phosphonic acid compounds and derivatives thereof. In addition, in this specification, "(meth) acrylic" means that both acrylic and methacryl are included.
　上記分散剤の添加量は、特に限定されず、上記廃水中に含まれる懸濁物質の濃度に応じて適宜決定されることが好ましい。例えば、上記廃水に対し１ｍｇ／Ｌ以上添加されることが好ましく、１～２０ｍｇ／Ｌ添加されることがより好ましく、１～５ｍｇ／Ｌであることがさらに好ましい。 The amount of the dispersant added is not particularly limited, and is preferably determined as appropriate according to the concentration of the suspended solid contained in the wastewater. For example, it is preferable to add 1 mg / L or more to the wastewater, more preferably 1 to 20 mg / L, and even more preferably 1 to 5 mg / L.
　本発明の処理方法により処理される廃水に含まれるシアン化合物は、廃水中に単独形態及び懸濁物質に吸着された形態で含まれていることが好ましい。本発明の廃水の処理方法によれば、懸濁物質を含む廃水であっても分析装置に不具合を生じることなく、上記廃水中のシアン化合物を分析できるため、該懸濁物質に吸着された形態で含まれるシアン化合物を取り除くことなく、廃水中のシアン化合物をより正確に分析することができる。そのため、本発明のシアン化合物を含む廃水の処理方法は、シアン化合物が単独形態及び懸濁物質に吸着された形態で含まれる廃水を好適に処理することができる。 The cyanide compound contained in the wastewater treated by the treatment method of the present invention is preferably contained in the wastewater in a single form or in a form adsorbed on a suspended solid. According to the wastewater treatment method of the present invention, even if the wastewater contains a suspended solid, the cyanide compound in the wastewater can be analyzed without causing a problem in the analyzer, so that the form adsorbed by the suspended solid is formed. It is possible to analyze the cyanide in wastewater more accurately without removing the cyanide contained in the wastewater. Therefore, the method for treating wastewater containing a cyanide compound of the present invention can suitably treat wastewater containing a cyanide compound in a single form or in a form adsorbed on a suspended solid.
　本発明において、廃水中のシアン化合物の含有量は、特に限定されないが、全シアン濃度で０．５～３０ｍｇ／Ｌの廃水を好適に処理することができ、全シアン濃度で１～２０ｍｇ／Ｌの廃水をより好適処理することができる。 In the present invention, the content of the cyanide compound in the wastewater is not particularly limited, but the wastewater having a total cyanide concentration of 0.5 to 30 mg / L can be suitably treated, and the total cyanide concentration is 1 to 20 mg / L. Wastewater can be treated more favorably.
　本発明において、シアン化合物を含む廃水としては、製鉄工場、化学工場、メッキ工場、コークス製造工場、金属表面処理工場などから排出されるシアン化合物を含む廃水、放射能汚染水の処理工程において排出されるシアン化合物を含む廃水、土壌の処理装置から排出されるシアン化合物を含む廃水が挙げられる。特に、本発明のシアン化合物を含む廃水の処理方法は、製鉄所、化学工場、メッキ工場、コークス製造工場又は金属表面処理工場から生じる廃水、すなわち、上記濃度の懸濁物質を含有する廃水に含まれるシアン化合物の処理に好適である。 In the present invention, the wastewater containing a cyan compound is discharged in the treatment process of waste water containing a cyan compound and radioactively contaminated water discharged from an iron manufacturing factory, a chemical factory, a plating factory, a coke manufacturing factory, a metal surface treatment factory and the like. Examples include wastewater containing cyanide compounds and wastewater containing cyanide compounds discharged from soil treatment equipment. In particular, the method for treating wastewater containing a cyan compound of the present invention is contained in wastewater generated from a steel mill, a chemical factory, a plating factory, a coke manufacturing factory or a metal surface treatment factory, that is, wastewater containing a suspended substance having the above concentration. Suitable for treating cyanide compounds.
　上記分析工程は、６時間以内の間隔で実施されることが好ましく、４時間以内の間隔であることがより好ましく、３時間以内の間隔であることがさらに好ましい。また、上記分析工程は、連続分析されることが最も好ましい。本明細書において、連続分析とは、１２０分間隔以内で分析が行われることをいう。シアン化合物を含む廃水中のシアン化合物の種類及び／又は濃度は時々刻々と変化するものであるため、定期的に確認することが好ましく、連続で確認することがより好ましいためである。また、上記分析工程は、１５分以上や３０分以上の間隔をあけて実施されるものとしてもよい。 The analysis step is preferably carried out at intervals of 6 hours or less, more preferably at intervals of 4 hours or less, and even more preferably at intervals of 3 hours or less. Further, it is most preferable that the analysis step is continuously analyzed. As used herein, continuous analysis means that the analysis is performed within 120 minute intervals. This is because the type and / or concentration of the cyanide compound in the wastewater containing the cyanide compound changes from moment to moment, so that it is preferable to check it regularly, and it is more preferable to check it continuously. Further, the analysis step may be performed at intervals of 15 minutes or more or 30 minutes or more.
　また、本発明の廃水の処理方法は、上記処理工程から得られる処理後排水に含まれるシアン化合物量を測定する処理後排水測定工程をさらに含み、上記処理工程で使用される薬剤の使用量を、上記処理後排水測定工程で生成された処理後排水の情報に基づいて調整することが好ましい。 Further, the wastewater treatment method of the present invention further includes a post-treatment wastewater measurement step of measuring the amount of cyanide compound contained in the post-treatment wastewater obtained from the above treatment step, and the amount of chemicals used in the above treatment step is used. It is preferable to make adjustments based on the information on the post-treatment wastewater generated in the above-mentioned post-treatment wastewater measurement step.
　また、本発明の廃水の処理方法は、上記分析工程及び上記処理工程が自動で行われることが好ましい。また、上記分析工程、上記処理工程及び上記処理後排水測定工程が自動で行われることが好ましい。さらにこれらのデータや制御についてインターネットを介して表示し、また報告させるようなシステムにすることも可能である。 Further, in the wastewater treatment method of the present invention, it is preferable that the above analysis step and the above treatment step are automatically performed. Further, it is preferable that the analysis step, the treatment step and the post-treatment wastewater measurement step are automatically performed. Furthermore, it is possible to make a system that displays and reports these data and controls via the Internet.
　本発明の処理方法では、本発明の効果を阻害しない範囲で、防錆剤、腐食防止剤、スライムコントロール剤、金属捕集剤、消泡剤などの公知の薬剤を併用してもよい。
　さらに、本発明の処理方法は、本発明の効果を阻害しない範囲で、本分野で一般的に使用されている赤外線や紫外線など公知の物理的なシアン処理方法と併用してもよい。
　また、本発明の処理方法は、さらに、一般的にシアン化合物を含む廃水を化学的に処理した後に実施される処理（例えば、固液分離処理等）方法を含んでもよい。また、一般的にシアン化合物を含む廃水を化学的に処理した後に実施される処理方法に用いられる方法及び装置は特に限定されず、一般的に用いられる方法及び装置を用いることができる。例えば、固液分離処理については、シックナー、クラリファイヤー、沈殿池等の公知の装置を用いることができる。 In the treatment method of the present invention, known agents such as rust preventives, corrosion inhibitors, slime control agents, metal trapping agents, and defoaming agents may be used in combination as long as the effects of the present invention are not impaired.
Further, the treatment method of the present invention may be used in combination with a known physical cyan treatment method such as infrared rays or ultraviolet rays generally used in the present field as long as the effects of the present invention are not impaired.
Further, the treatment method of the present invention may further include a treatment method (for example, solid-liquid separation treatment or the like) that is generally carried out after chemically treating wastewater containing a cyanide compound. Further, the method and apparatus generally used for the treatment method carried out after chemically treating the wastewater containing a cyanide compound are not particularly limited, and the generally used method and apparatus can be used. For example, for the solid-liquid separation treatment, known devices such as thickeners, clarifiers, and sedimentation basins can be used.
　また、本発明は、懸濁物質を含有する廃水に含まれるシアン化合物を分析する分析手段と、上記分析手段に導入される上記廃水に分散剤を添加する分散剤添加手段と、上記廃水に薬剤を添加して上記シアン化合物を処理する処理手段と、上記分析手段で生成されたシアン化合物情報に基づいて上記処理手段で使用される上記薬剤の種類及び／又は上記薬剤の使用量を決定する薬剤制御手段とを備え、上記処理手段で使用される上記薬剤の種類及び／又は上記薬剤の使用量を自動制御することを特徴とするシアン化合物を含む廃水を処理するための薬剤の自動制御システムでもある。 Further, the present invention comprises an analysis means for analyzing a cyanide compound contained in wastewater containing a suspended substance, a dispersant addition means for adding a dispersant to the wastewater introduced into the analysis means, and a chemical agent for the wastewater. And / or an agent for determining the type of the agent used in the treatment means and / or the amount of the agent used based on the cyanide information generated by the analysis means. Also in an automatic control system for a drug for treating wastewater containing a cyanide compound, which comprises a control means and automatically controls the type of the drug used in the treatment means and / or the amount of the drug used. be.
　本発明の自動制御システムは、上述した本発明の処理方法における態様と同様の態様とすることができ、また、上述した本発明の処理方法における好適な態様も同様に好適な態様とすることができる。すなわち、上述した本発明の処理方法に関する説明は、本発明のシステムに関する説明でもあり、本発明の自動制御システムに関する説明として採用することができる。 The automatic control system of the present invention can be the same as the above-described aspect of the processing method of the present invention, and the preferred embodiment of the above-mentioned processing method of the present invention may be similarly suitable. can. That is, the above-mentioned description of the processing method of the present invention is also a description of the system of the present invention, and can be adopted as a description of the automatic control system of the present invention.
　図１は本発明の一実施形態を示すものであるが、本発明は本実施形態に限定されるものではない。図１には、懸濁物質及びシアン化合物を含有する廃水（原水）に、薬剤を添加して、上記シアン化合物を処理するための処理槽１と、処理槽１に導入される前に、分析用ラインに分取され、処理前の廃水（原水）が導入される分析手段２とが示されている。分析手段２に導入される原水は、分散剤添加手段４により分散剤タンク７にある分散剤が添加される。分析手段２で生成されたシアン化合物情報は、薬剤制御手段に送られ、薬剤制御手段において、上記シアン化合物情報に基づき、処理槽１に添加される薬剤の種類及び／又は薬剤の使用量が決定され、薬剤添加手段３、３´に薬剤制御手段で決定された情報が送られる。本発明のシステムにおける処理手段は、図１における処理槽１、薬剤添加手段３、３´及び薬剤タンク６、６´であるが、本形態に限定されるものではない。また、薬剤タンク及び薬剤添加手段は、図１に記載の形態に限定されるものではなく、使用される薬剤の種類や、添加方法に応じて適宜変更可能である。なお、図１には、処理後排水を分取して測定する処理後排水測定手段５が示されている。本構成は必須の構成ではないが、好適に用いることができる。
　また、図１に記載のフローメーター（ＦＭ）の位置は、廃水（原水）が分析ラインに分岐する前に設置されていてもよい。
　また、図１には示されていないが、分析手段２を通過した廃水は原水に戻されてもよく、また、処理槽１に導入されてもよい。 FIG. 1 shows an embodiment of the present invention, but the present invention is not limited to the present embodiment. In FIG. 1, a chemical is added to wastewater (raw water) containing a suspended solid and a cyanide compound, and the treatment tank 1 for treating the cyanide compound and the analysis tank 1 before being introduced into the treatment tank 1 are analyzed. An analytical means 2 is shown in which the wastewater (raw water) before the treatment is introduced into the analysis means that is separated into the line. The dispersant in the dispersant tank 7 is added to the raw water introduced into the analysis means 2 by the dispersant adding means 4. The cyanide compound information generated by the analysis means 2 is sent to the drug control means, and the drug control means determines the type and / or the amount of the drug to be added to the treatment tank 1 based on the cyanide compound information. Then, the information determined by the drug control means is sent to the drug addition means 3, 3'. The processing means in the system of the present invention are the processing tank 1, the drug adding means 3, 3'and the drug tanks 6, 6'in FIG. 1, but are not limited to this embodiment. Further, the drug tank and the drug adding means are not limited to the form shown in FIG. 1, and can be appropriately changed depending on the type of the drug used and the method of adding the drug. In addition, FIG. 1 shows a post-treatment wastewater measuring means 5 for separating and measuring the treated wastewater. Although this configuration is not an essential configuration, it can be preferably used.
Further, the position of the flow meter (FM) shown in FIG. 1 may be installed before the wastewater (raw water) branches to the analysis line.
Further, although not shown in FIG. 1, the wastewater that has passed through the analysis means 2 may be returned to the raw water or may be introduced into the treatment tank 1.
　本発明の自動制御システムにおける薬剤制御手段は、廃水に含まれるシアン化合物情報に加え、上記廃水量情報、上記廃水に含まれる他の含有情報及び排水基準等に基づき、薬剤の種類及び／又は使用量を決定することができる。上記廃水に含まれる他の含有情報は、予め設定された情報であってもよく、上記分析工程においてシアン化合物の分析と同時に測定された情報であってもよい。また、上記廃水量情報は、予め設定された情報であってもよく、原水のフローメーターで測定された値であってもよい。 The drug control means in the automatic control system of the present invention is based on the cyanide compound information contained in the wastewater, the wastewater amount information, other content information contained in the wastewater, wastewater standards, etc., and the type and / or use of the drug. The amount can be determined. The other content information contained in the wastewater may be preset information or information measured at the same time as the analysis of the cyanide compound in the analysis step. Further, the wastewater amount information may be preset information or may be a value measured by a flow meter of raw water.
　本発明のシステムは、上記各手段が好適に実施されるための他の構成を含んでいてもよい。例えば、上記処理手段は、薬剤を混合するための混合手段を有していてもよく、また、処理中の廃液のｐＨを測定するためのｐＨ測定手段や温度測定手段を有していてもよく、加熱手段を有していてもよい。また、また、反応処理槽の他に、シックナー、クラリファイヤー、沈殿池等の公知の固液分離装置を用いることができ、既設の装置を転用してもよい。 The system of the present invention may include other configurations for each of the above means to be preferably carried out. For example, the treatment means may have a mixing means for mixing the drug, or may have a pH measuring means or a temperature measuring means for measuring the pH of the waste liquid being treated. , May have heating means. Further, in addition to the reaction treatment tank, a known solid-liquid separation device such as a thickener, a clarifier, or a settling basin can be used, and the existing device may be diverted.
１　処理槽
２　分析手段
３、３´　薬剤添加手段
４　分散剤添加手段
５　処理後廃水測定手段
６、６´　薬剤タンク
７　分散剤タンク 1 Treatment tank 2 Analytical means 3, 3'Chemical addition means 4 Dispersant addition means 5 Post-treatment wastewater measuring means 6, 6'Chemical tank 7 Dispersant tank

Claims (9)

  1. 　懸濁物質を含有する廃水に含まれるシアン化合物を分析する分析工程と、
    　前記廃水に薬剤を添加して前記シアン化合物を処理する処理工程とを有し、
    　前記分析工程で生成された前記廃水中のシアン化合物情報に基づいて前記処理工程で使用される前記薬剤の種類及び／又は前記薬剤の使用量を決定し、
    　前記分析工程に導入される前記廃水に分散剤を添加する
    ことを特徴とするシアン化合物を含む廃水の処理方法。     An analysis process for analyzing cyanide contained in wastewater containing suspended solids,
    It has a treatment step of adding a chemical to the wastewater to treat the cyanide compound.
    Based on the cyanide compound information in the wastewater generated in the analysis step, the type and / or the amount of the drug used in the treatment step is determined.
    A method for treating wastewater containing a cyanide compound, which comprises adding a dispersant to the wastewater introduced into the analysis step.
  2. 　分析工程は、懸濁物質を含有する廃水に含まれるシアン化合物を、前記廃水とセンサーとを直接接触させずに分析する請求項１に記載の処理方法。 The treatment method according to claim 1, wherein the analysis step analyzes the cyanide compound contained in the wastewater containing a suspended solid without directly contacting the wastewater with the sensor.
  3. 　シアン化合物は、廃水中に単独形態及び懸濁物質に吸着された形態で含まれている請求項１又は２に記載の処理方法。 The treatment method according to claim 1 or 2, wherein the cyanide compound is contained in wastewater in a single form or in a form adsorbed on a suspended solid.
  4. 　廃水は、製鉄所、化学工場、メッキ工場、コークス製造工場又は金属表面処理工場から生じる廃水である請求項１、２又は３に記載の処理方法。 The treatment method according to claim 1, 2 or 3, wherein the waste water is waste water generated from a steel mill, a chemical factory, a plating factory, a coke manufacturing factory or a metal surface treatment factory.
  5. 　分散剤は、（メタ）アクリル酸系重合物、マレイン酸系重合物、ホスホン酸系化合物及びこれらの誘導体からなる群より選択される少なくとも１種である請求項１、２、３又は４に記載の処理方法。 The dispersant is at least one selected from the group consisting of (meth) acrylic acid-based polymers, maleic acid-based polymers, phosphonic acid-based compounds and derivatives thereof, according to claim 1, 2, 3 or 4. Processing method.
  6. 　分析工程は、６時間以内の間隔で実施される請求項１、２、３、４又は５に記載の処理方法。 The processing method according to claim 1, 2, 3, 4 or 5, wherein the analysis step is carried out at intervals of 6 hours or less.
  7. 　処理工程から得られる処理後排水に含まれるシアン化合物量を測定する処理後排水測定工程をさらに含み、処理工程で使用される薬剤の使用量を、前記処理後排水測定工程で生成された処理後排水の情報に基づいて調整する請求項１、２、３、４、５又は６に記載の処理方法。 A post-treatment wastewater measurement step of measuring the amount of cyanide compound contained in the post-treatment wastewater obtained from the treatment step is further included, and the amount of the chemical used in the treatment step is measured after the treatment generated in the post-treatment wastewater measurement step. The treatment method according to claim 1, 2, 3, 4, 5 or 6, which is adjusted based on the wastewater information.
  8. 　分析工程及び処理工程が自動で行われる請求項１、２、３、４、５又は６に記載の処理方法、又は、前記分析工程、前記処理工程及び処理後排水測定工程が自動で行われる請求項７に記載の処理方法。 The treatment method according to claim 1, 2, 3, 4, 5 or 6, in which the analysis step and the treatment step are automatically performed, or the claim in which the analysis step, the treatment step and the post-treatment wastewater measurement step are automatically performed. Item 7. The processing method according to Item 7.
  9. 　懸濁物質を含有する廃水に含まれるシアン化合物を分析する分析手段と、
    　前記分析手段に導入される前記廃水に分散剤を添加する分散剤添加手段と、
    　前記廃水に薬剤を添加して前記シアン化合物を処理する処理手段と、
    　前記分析手段で生成されたシアン化合物情報に基づいて前記処理手段で使用される前記薬剤の種類及び／又は前記薬剤の使用量を決定する薬剤制御手段とを備え、
    　前記処理手段で使用される前記薬剤の種類及び／又は前記薬剤の使用量を自動制御することを特徴とするシアン化合物を含む廃水を処理するための薬剤の自動制御システム。

     
          Analytical means for analyzing cyanide contained in wastewater containing suspended solids,
    A dispersant adding means for adding a dispersant to the wastewater introduced into the analytical means, and a dispersant adding means.
    A treatment means for treating the cyanide compound by adding a chemical to the wastewater,
    A drug control means for determining the type and / or the amount of the drug used in the treatment means based on the cyanide compound information generated by the analysis means is provided.
    An automatic control system for a drug for treating wastewater containing a cyanide compound, which automatically controls the type and / or amount of the drug used in the treatment means.
PCT/JP2021/020891 2020-06-08 2021-06-01 Method for treating wastewater containing cyanogen compound and automatic control system for chemical for treating wastewater containing cyanogen compound WO2021251220A1 (en)

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