WO2016076335A1 - Procédé et dispositif d'élimination d'arsenic - Google Patents

Procédé et dispositif d'élimination d'arsenic Download PDF

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Publication number
WO2016076335A1
WO2016076335A1 PCT/JP2015/081663 JP2015081663W WO2016076335A1 WO 2016076335 A1 WO2016076335 A1 WO 2016076335A1 JP 2015081663 W JP2015081663 W JP 2015081663W WO 2016076335 A1 WO2016076335 A1 WO 2016076335A1
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Prior art keywords
arsenic
solution
liquid
ion exchanger
weakly acidic
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PCT/JP2015/081663
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English (en)
Japanese (ja)
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稔 寺田
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株式会社エヴァテック研究所
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Priority to JP2016559075A priority Critical patent/JPWO2016076335A1/ja
Publication of WO2016076335A1 publication Critical patent/WO2016076335A1/fr

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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
    • C02F1/28—Treatment of water, waste water, or sewage by sorption
    • 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
    • C02F1/42—Treatment of water, waste water, or sewage by ion-exchange
    • 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
    • C02F1/62—Heavy metal compounds
    • 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

Definitions

  • the present invention relates to a method and apparatus for removing arsenic from a liquid such as groundwater.
  • groundwater The main forms of groundwater are arsenic acid (H 3 AsO 4 ) and arsenous acid (H 3 AsO 3 ), which are inorganic, and exist in an ionic form. Since groundwater is in a reducing environment, arsenic in groundwater often exists in the form of arsenite ions with an oxidation number of 3. It is known that arsenite has higher solubility than arsenate and inferior adsorbability to the adsorbent. For example, activated alumina (Al 2 O 3 ), iron-based compounds such as iron hydroxide, and cerium oxide are known as arsenic removal agents, but in this case as well, arsenite ions are hardly adsorbed on activated alumina.
  • activated alumina Al 2 O 3
  • iron-based compounds such as iron hydroxide
  • cerium oxide are known as arsenic removal agents, but in this case as well, arsenite ions are hardly adsorbed on activated alumina.
  • adsorbents such as activated alumina (Al 2 O 3 ), iron-based compounds and cerium oxide have a high adsorption rate at a weakly acidic to neutral pH.
  • Patent Document 1 describes that arsenic is oxidized by arsenite oxidizing bacteria. However, dedicated equipment is required for bacterial culture. Moreover, it is not preferable to use bacteria as drinking water.
  • the present invention provides a method and an apparatus for removing arsenic by easily oxidizing trivalent arsenite ions in a solution to pentavalent arsenate ions efficiently and simply. Objective.
  • Hypochlorite is used to sterilize drinking water. It has been found that by mixing this hypochlorite with a liquid containing arsenic, trivalent arsenic-containing ions can be easily oxidized to pentavalent arsenic-containing ions, and the present invention has been conceived.
  • hypochlorite When mixed with hypochlorite, the pH of the solution increases.
  • the bactericidal power of hypochlorous acid solution varies depending on its pH.
  • the inventors have found that by using a weakly acidic ion exchanger, it can be easily lowered to a weakly acidic pH preferable for an arsenic adsorbent and can be adjusted to a pH having a strong bactericidal power, and the present invention has been conceived. .
  • the present invention is a method for removing arsenic from a liquid containing arsenic, Mixing liquid and hypochlorite; Contacting the mixed solution with a weakly acidic ion exchanger to lower the pH of the solution; contacting the reduced pH solution with an arsenic adsorbent to remove arsenic from the liquid;
  • a method comprising:
  • the present invention also provides a method in which the arsenic adsorbent is a liquid activated alumina.
  • the present invention is an apparatus for removing arsenic from a solution containing arsenic, A container containing a weakly acidic ion exchanger for passing a liquid and hypochlorite mixed solution; A removal container containing an arsenic remover for removing arsenic from the liquid; An apparatus is provided.
  • the present invention is an apparatus for removing arsenic from a solution, and a pH lowering container containing a weakly acidic ion exchanger for lowering the pH of a solution in which a liquid and a hypochlorite are mixed, A removal container containing an arsenic remover for removing arsenic from the liquid; An apparatus is provided.
  • arsenic can be removed easily and quickly without using an acid such as hydrochloric acid.
  • the pH of the liquid can be adjusted easily and quickly, and arsenic can be removed easily and rapidly.
  • the pH of a solution containing hypochlorite can be adjusted from basic to weakly acidic, weakly acidic hypochlorous acid can be generated in the solution. Therefore, according to the present invention, arsenic can be removed from a liquid by a simple and quick method without using complicated equipment, and drinking water having a bactericidal effect containing weakly acidic hypochlorous acid is obtained. It is possible.
  • the method for removing arsenic from a liquid containing arsenic includes a step of mixing a liquid and hypochlorite, a step of bringing the mixed solution into contact with a weakly acidic ion exchanger to lower the pH of the solution, contacting the lowered pH solution with an arsenic adsorbent to remove arsenic from the liquid.
  • removing arsenic from the liquid means removing and reducing arsenic contained in the liquid by any means.
  • arsenic includes any compound containing an arsenic element and a salt thereof, and these ions in a liquid.
  • arsenic includes trivalent arsenite ions and pentavalent arsenate ions.
  • the trivalent arsenic-containing ions include 0 or ⁇ 1 arsenite ions such as H 3 AsO 3 0 , H 2 AsO 3 ⁇ and HAsO 3 2 ⁇ , and also include complex ion forms.
  • the pentavalent arsenic-containing ions include 0, ⁇ 1 or ⁇ 2 arsenic ions such as H 2 AsO 4 ⁇ , HAsO 4 2 ⁇ and AsO 4 3 ⁇ , and also include complex ion forms.
  • the liquid containing arsenic can be for beverages such as groundwater, river water and lake water.
  • the liquid containing arsenic can also be factory wastewater or soil contaminated water containing arsenic.
  • the liquid from which arsenic has been removed by the method of the present invention is only required to have a lower arsenic content than before removal, and does not necessarily meet the water quality standards stipulated by law as drinking water. Good.
  • the method of the present invention includes the step of mixing the liquid and the hypochlorite.
  • Hypochlorite is commonly recognized by those skilled in the art, such as sodium hypochlorite (NaClO), potassium hypochlorite (KClO), and calcium hypochlorite (Ca (ClO) 2 ). Includes any hypochlorous acid salt.
  • Hypochlorite can be mixed in the state of a solution.
  • hypochlorite commercially available materials and materials produced by methods well known to those skilled in the art can be used.
  • the solution can also be in any solution such as water.
  • sodium hypochlorite aqueous solution can be used for hypochlorite.
  • a hypochlorite solution can be prepared by adding solids such as calcium hypochlorite to water.
  • hypochlorite solution a solution having an arbitrary concentration can be used.
  • a solution having an arbitrary concentration can be used.
  • weakly acidic hypochlorous acid having a concentration that cannot be produced by a conventional method such as 10000 ppm can be produced.
  • the hypochlorite solution exists in the solution as one of hypochlorous acid, chlorine molecules, and hypochlorite ions depending on the pH.
  • an aqueous sodium hypochlorite solution is produced as an alkaline solution.
  • the aqueous sodium hypochlorite solution is diluted to 50 to 100 ppm, which is a concentration generally used as sterilizing water, the pH drops to about 8.5 to 9.5.
  • hypochlorous acid HClO and hypochlorite ion HClO ⁇ have an oxidizing action, and trivalent arsenic-containing ions in the liquid are oxidized to pentavalent arsenic-containing ions.
  • the method of the present invention includes a step of bringing the solution mixed with the hypochlorite into contact with a weakly acidic ion exchanger to lower the pH of the solution.
  • the method of the present invention uses a weakly acidic ion exchanger capable of ion exchange of a solution having a pH of 4 to 7 or more.
  • the weakly acidic ion exchanger can be, for example, an ion exchanger having a carboxylic acid group (—COOH) as an exchange group.
  • weakly acidic ion exchangers can exchange bases such as NaOH and salts of weak acids such as NaHCO 3 .
  • any weakly acidic ion exchanger known to those skilled in the art can be used as the weakly acidic ion exchanger.
  • the weak acid ion exchanger can be a weak acid ion exchange resin such as a methacrylic acid weak acid cation exchange resin and an acrylic acid weak acid cation exchange resin.
  • a weakly acidic ion exchange resin known to those skilled in the art, such as Amberlite IRC-76 (organo Corporation) and acrylic Diaion (registered trademark) WK40L (Mitsubishi Chemical Corporation).
  • Amberlite IRC-76 organic Corporation
  • acrylic Diaion (registered trademark) WK40L Mitsubishi Chemical Corporation
  • any material having an ion exchange action and a pH buffer action such as ceramic and natural ore can be used as the weak acid ion exchanger.
  • the weakly acidic ion exchanger used in the present invention has a buffering action, for example, in a weakly acidic to neutral range, in a pH range of about 3.5 to 7.5, particularly in a range of 4.0 to 7.0. Therefore, according to the method of the present invention, the pH of the solution after the treatment with the weakly acidic ion exchanger is in the range of pH 3.5 to 7.5, for example, pH 4.0 to 6.5.
  • the weakly acidic ion exchanger can be used in an arbitrary amount.
  • a person skilled in the art will be able to adjust the amount of the weakly acidic ion exchanger depending on the concentration and amount of arsenic contained in the liquid.
  • the method of the present invention does not make the pH of the liquid after passing too low even if an excessive amount of weakly acidic ion exchanger is used. Therefore, the method of the present invention can use an excess amount without adjusting the amount of the weakly acidic ion exchanger according to the concentration and amount of arsenic contained in the liquid.
  • the pH can be kept constant even when an excessive amount of weakly acidic ion exchanger is used. Therefore, after the pH of the liquid is lowered in the method of the present invention, the pH does not become too low.
  • arsenic can be oxidized, particularly when removing arsenic in drinking water, while maintaining a slightly acidic pH without compromising taste.
  • the strength of adsorption of various ions by the weakly acidic cation exchange resin is generally higher in selectivity as the valence is higher, but is particularly characterized by very high selectivity for H ions.
  • a chemical such as hydrochloric acid or sulfuric acid aqueous solution.
  • it is easy to regenerate when repeatedly used, and it is possible to regenerate with a drug amount slightly higher than the theoretical chemical equivalent.
  • the contact between the liquid and the weakly acidic ion exchanger can be performed by any method.
  • the liquid can be brought into contact with a container filled with a weak acid ion exchanger.
  • liquid can be passed from one side of the column packed with the weakly acidic ion exchanger to the other.
  • the pH of the liquid can be lowered simply by passing the liquid through a container containing a weakly acidic ion exchanger.
  • the produced hypochlorous acid does not react with the ion exchanger by being separated from the ion exchanger immediately after the contact, it is possible to suppress the decomposition of the produced hypochlorous acid due to pH reduction. it can.
  • the weakly acidic ion exchanger can be filled in a liquid permeable bag such as a nonwoven fabric. Thereby, a weak acidic ion exchanger can be easily exchanged only by changing the bag in containers, such as a column.
  • HOCl and OCl - standard reduction potential of (EO) is respectively 1.48V and 0.81 V.
  • the abundance of hypochlorous acid in the solution can be increased, and thus the sterilizing power of the solution can be increased.
  • the method of the present invention includes the step of oxidizing arsenic by contacting the liquid with a weakly acidic ion exchanger and then removing the arsenic from the oxidized liquid.
  • Arsenic can be removed by any means known to those skilled in the art.
  • arsenic can be removed by adsorbing to arsenic adsorbents such as activated alumina, iron oxide-based adsorbent filter agents, manganese oxides, cerium hydroxide, other ion exchange resins and chelate resins.
  • KH series Suditomo Chemical Co., Ltd.
  • KHD-12 and KHD-12 SR activated alumina (Al 2 O 3 )
  • READ-As Nahonkaikai Co., Ltd.
  • cerium hydroxide arsenic adsorbents. can do.
  • Adsorption of arsenic on the adsorbent can be performed by any method.
  • the liquid can be brought into contact with a container filled with an adsorbent.
  • liquid can be passed from one of the columns packed with adsorbent to the other.
  • liquid arsenic whose pH is adjusted can be easily adsorbed only by passing the liquid through a container containing an adsorbent.
  • the adsorbent can be filled in a liquid permeable bag such as a nonwoven fabric. Thus, the adsorbent can be easily replaced simply by replacing the bag in the container such as a column.
  • the contact with the weak acid ion exchanger and the subsequent adsorption of arsenic to the adsorbent can be performed continuously.
  • a series of columns in which a column packed with a weakly acidic ion exchanger and a column packed with an adsorbent are connected can be used. By using the connected column, it is possible to oxidize arsenic in the liquid simply by passing through this column, and to adsorb arsenic.
  • trivalent arsenic is oxidized to pentavalent, and the pH of the solution containing arsenic is reduced to about 5 to 7, so that the pH range is suitable for an arsenic adsorbent. Therefore, according to the method of the present invention, trivalent arsenic oxidation and pH adjustment, which are problematic in an arsenic adsorbent such as activated alumina, can be easily and rapidly performed. Furthermore, since the produced hypochlorous acid solution is in a pH range where the abundance of hypochlorous acid is high, a solution having a high bactericidal effect can be produced at the same time.
  • the contact between the liquid and the weakly acidic ion exchanger and the adsorption to the adsorbent can be performed in the same container.
  • a weakly acidic ion exchanger and an adsorbent can be mixed and packed in a column.
  • arsenic in the liquid can be oxidized by simply passing through the column, and arsenic can be adsorbed.
  • An apparatus for removing arsenic from a solution of the present invention comprises a pH lowering container containing a weakly acidic ion exchanger for lowering the pH of a solution mixed with a liquid and hypochlorite, and an arsenic from the liquid. And a removal container containing an arsenic removing agent.
  • the apparatus of the present invention includes an ion exchanger-filled container such as a column packed with a weakly acidic ion exchanger as a pH lowering container.
  • the weakly acidic ion exchanger can use the materials as described above.
  • the hypochlorite solution that has passed through the ion exchanger filled container can react with the weakly acidic ion exchanger to lower the pH of the liquid.
  • the pH lowering container is connected to a removing container containing an arsenic removing agent.
  • an arsenic removing agent the material as described above can be used.
  • Arsenic can be removed by the liquid having a lowered pH coming into contact with the arsenic removing agent in the removal container.
  • the apparatus of the present invention is used as follows, for example.
  • hypochlorite as described above is added to the solution.
  • hypochlorite as described above is added to the solution.
  • a pH lowering container When drinking water is produced by removing arsenic from a 100 ml solution, several drops to tens of ppm sodium hypochlorite solution can be obtained by adding a few drops of 10000 ppm sodium hypochlorite solution to the solution. Become.
  • This solution is introduced into a pH lowering container.
  • the pH of the introduced hypochlorite solution is lowered to pH 5-7, which is a pH suitable for adsorption of the arsenic removing agent.
  • the solution is introduced into the removal container.
  • arsenic is adsorbed by the arsenic adsorbent, and a solution from which arsenic has been removed is generated.
  • the apparatus of the present invention may further include a storage container.
  • a liquid and hypochlorite are mixed in a storage container.
  • the hypochlorite solution is connected to an ion exchanger filled container filled with a weakly acidic ion exchanger, and the solution is introduced from the storage container into the ion exchanger filled container.
  • the storage container may further include a pump for introducing the solution into the ion exchanger filling container, and may be connected to the ion exchanger filling container via the pump.
  • the ion exchanger and the arsenic removing agent can be mixed and used. In this case, it is not necessary to separate the pH lowering container and the removing container from each other, and it is sufficient to fill the single container with the mixture of the ion exchanger and the arsenic removing agent. By passing the liquid through the mixture, arsenic in the liquid can be oxidized and adsorbed by simply passing through the column.
  • Example 1 Materials and Methods In Example 1, as a liquid, reagent arsenic was added to distilled water to prepare raw water so as to have an arsenic concentration of 0.5 ppm. *
  • arsenic standard solution 1000 ppm (Merck Millipore) was added to distilled water and diluted to 0.25 ppm.
  • 6500 ppm of sodium arsenite aqueous solution (Merck Millipore) was added to distilled water to make 0.25 ppm.
  • raw water containing a total of 0.5 ppm arsenic standard solution + sodium arsenite aqueous solution was prepared.
  • Example 4 groundwater collected in Sri Lanka was used as raw water. These groundwaters are known to contain trivalent and pentavalent arsenic. The groundwater contained 0.03 ppm arsenic. *
  • Acrylic Diaion (registered trademark) WK40L (Mitsubishi Chemical Corporation) was used as the weakly acidic ion exchanger.
  • READ-As (Nihonkaikai Co., Ltd.) was used as an arsenic adsorbent.
  • Commercial activated alumina was used as the activated alumina. *
  • the arsenic content was measured using the Emquant TM Arsenic Test (Merck Millipore) and the Arsenic Mercoquant Arsenic Test (Ultra Sensitive Type) (Merck Millipore).
  • the pH was measured using a pH portable water quality meter P-30 (Toa DKK).
  • a handy water quality meter “AQUAB” AQ-202 type was used. *
  • Example 1 Confirmation of Arsenic Removal Effect by the Method of the Present Invention
  • arsenic removal from raw water prepared by adding reagent arsenic to distilled water to a concentration of 0.5 ppm was confirmed.
  • a column packed with 2 ml of arsenic adsorbent + 20 ml of weak acid ion exchanger, 2 ml of activated alumina + 20 ml of weak acid ion exchanger were prepared.
  • a column only packed with 20 ml of weakly acidic ion exchanger was also produced. *
  • the arsenic content of the raw water was measured and found to be 0.5 ppm.
  • the arsenic content of the liquid obtained by passing raw water through a column packed with 20 ml of weakly acidic ion exchanger + 2 ml of arsenic adsorbent was measured, it was 0.05 ppm. It can be seen that treating the arsenic solution with a weakly acidic ion exchanger lowers the pH and increases the effect of arsenic adsorption. Arsenic could be removed very efficiently by the arsenic removal method of the present invention. *
  • Example 2 Confirmation of removal effect of arsenous acid and arsenic by activated alumina by the method of the present invention
  • reagent arsenic acid and arsenic were added to distilled water, and each of them was 0.25 ppm (total of 0.5 ppm). The removal of arsenic from the raw water mixed to include the concentration was confirmed. *
  • Example 3 Confirmation of removal effect of arsenous acid and arsenic by activated alumina and hypochlorous acid by the method of the present invention
  • reagent arsenic acid and arsenic were added to distilled water, and each was 0.25 ppm ( The removal of arsenic from the raw water mixed so as to include a concentration of 0.5 ppm in total was confirmed. Further, sodium hypochlorite was added to the raw water containing this arsenic so as to have a final concentration of 50 ppm.
  • Example 4 Confirmation of Arsenic Removal Effect from Vietnamese Water Containing Arsenic
  • groundwater collected in Sri Lanka was used as raw water.
  • a column packed with 2 ml of arsenic adsorbent + 20 ml of weak acid ion exchanger, 2 ml of activated alumina + 20 ml of weak acid ion exchanger were prepared.
  • a column only packed with 20 ml of weakly acidic ion exchanger was also produced.
  • each of raw water and raw water treated by the method of the present invention was seeded on an agar plate and cultured at 37 ° C. for 22 hours. Bacteria did not grow at all in the raw water treated by the method of the present invention, but bacteria grew in the untreated raw water.
  • arsenic can be easily and quickly removed from raw water, and a weakly acidic hypochlorous acid solution can be generated. Therefore, it can be used as a useful water purifier.

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  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Treatment Of Water By Oxidation Or Reduction (AREA)
  • Water Treatment By Sorption (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)
  • Treatment Of Water By Ion Exchange (AREA)

Abstract

Le problème décrit par la présente invention est de fournir un procédé et un dispositif d'élimination de l'arsenic d'une manière efficace, simple et rapide. La solution selon la présente invention repose sur la découverte qu'un mélange d'un hypochlorite avec un liquide contenant de l'arsenic permet d'amener facilement des ions contenant de l'arsenic trivalent à s'oxyder en ions contenant de l'arsenic pentavalent. Les inventeurs ont conçu la présente invention après avoir découvert que l'utilisation d'un échangeur d'ions faiblement acide permet de réduire facilement le pH à un niveau faiblement acide approprié pour un adsorbant d'arsenic et d'ajuster le pH à celui auquel un fort pouvoir stérilisant est obtenu. La présente invention concerne un procédé comprenant : une étape de mélange du liquide et de l'hypochlorite ; une étape de mise en contact de la solution de mélange avec un échangeur d'ions faiblement acide et de réduction du pH de la solution ; et une étape de mise en contact de la solution pour laquelle le pH a été réduit avec un adsorbant d'arsenic et d'élimination de l'arsenic du liquide.
PCT/JP2015/081663 2014-11-10 2015-11-10 Procédé et dispositif d'élimination d'arsenic WO2016076335A1 (fr)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2018094510A (ja) * 2016-12-14 2018-06-21 パナソニックＩｐマネジメント株式会社 水処理装置
JP7542235B2 (ja) 2020-08-04 2024-08-30 株式会社加月金物興業 陰イオン吸着剤、吸着剤袋、陰イオン吸着剤の使用方法、及び井戸水の浄化方法。

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5333978A (en) * 1976-09-10 1978-03-30 Tokyo Yuuki Kagaku Kougiyou Kk Method of treating colored waste water made from regeneration of anion exchange resins
JPS5488655A (en) * 1977-12-24 1979-07-13 Sumitomo Metal Mining Co Method of treating plated waste water
JPS55132633A (en) * 1979-03-30 1980-10-15 Agency Of Ind Science & Technol Adsorbent for arsenic
JPH10165948A (ja) * 1996-12-06 1998-06-23 Japan Organo Co Ltd 水中のヒ素除去装置
JP2005279409A (ja) * 2004-03-29 2005-10-13 Kubota Corp 有機金属化合物含有廃水の処理方法
CN101863574A (zh) * 2009-04-14 2010-10-20 刘懿颉 一种利用铁矿渣去除水中砷的方法及装置
JP2013001620A (ja) * 2011-06-20 2013-01-07 Evatech Corp 弱酸性次亜塩素酸、並びにその製造装置および製造方法
US20130186836A1 (en) * 2010-10-05 2013-07-25 Bio-Works Company Limited Method For Removing Arsenic From Water Using Polymer Based Matrices With Chelating Groups Comprising Metal Ions

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5333978A (en) * 1976-09-10 1978-03-30 Tokyo Yuuki Kagaku Kougiyou Kk Method of treating colored waste water made from regeneration of anion exchange resins
JPS5488655A (en) * 1977-12-24 1979-07-13 Sumitomo Metal Mining Co Method of treating plated waste water
JPS55132633A (en) * 1979-03-30 1980-10-15 Agency Of Ind Science & Technol Adsorbent for arsenic
JPH10165948A (ja) * 1996-12-06 1998-06-23 Japan Organo Co Ltd 水中のヒ素除去装置
JP2005279409A (ja) * 2004-03-29 2005-10-13 Kubota Corp 有機金属化合物含有廃水の処理方法
CN101863574A (zh) * 2009-04-14 2010-10-20 刘懿颉 一种利用铁矿渣去除水中砷的方法及装置
US20130186836A1 (en) * 2010-10-05 2013-07-25 Bio-Works Company Limited Method For Removing Arsenic From Water Using Polymer Based Matrices With Chelating Groups Comprising Metal Ions
JP2013001620A (ja) * 2011-06-20 2013-01-07 Evatech Corp 弱酸性次亜塩素酸、並びにその製造装置および製造方法

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2018094510A (ja) * 2016-12-14 2018-06-21 パナソニックＩｐマネジメント株式会社 水処理装置
JP7542235B2 (ja) 2020-08-04 2024-08-30 株式会社加月金物興業 陰イオン吸着剤、吸着剤袋、陰イオン吸着剤の使用方法、及び井戸水の浄化方法。

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