JPH0336595B2 - - Google Patents
Info
- Publication number
- JPH0336595B2 JPH0336595B2 JP19576189A JP19576189A JPH0336595B2 JP H0336595 B2 JPH0336595 B2 JP H0336595B2 JP 19576189 A JP19576189 A JP 19576189A JP 19576189 A JP19576189 A JP 19576189A JP H0336595 B2 JPH0336595 B2 JP H0336595B2
- Authority
- JP
- Japan
- Prior art keywords
- hexavalent chromium
- wastewater
- iron
- aqueous solution
- composition
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 33
- 239000002351 wastewater Substances 0.000 claims description 29
- JOPOVCBBYLSVDA-UHFFFAOYSA-N chromium(6+) Chemical compound [Cr+6] JOPOVCBBYLSVDA-UHFFFAOYSA-N 0.000 claims description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 20
- 239000000203 mixture Substances 0.000 claims description 19
- 239000007864 aqueous solution Substances 0.000 claims description 15
- 229910052742 iron Inorganic materials 0.000 claims description 10
- 150000002505 iron Chemical class 0.000 claims description 8
- 239000012629 purifying agent Substances 0.000 claims description 8
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 claims description 5
- VTLYFUHAOXGGBS-UHFFFAOYSA-N Fe3+ Chemical compound [Fe+3] VTLYFUHAOXGGBS-UHFFFAOYSA-N 0.000 claims description 5
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 4
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 4
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 3
- 239000012266 salt solution Substances 0.000 claims 2
- 238000011282 treatment Methods 0.000 description 11
- 239000011651 chromium Substances 0.000 description 7
- 238000000034 method Methods 0.000 description 6
- 238000001556 precipitation Methods 0.000 description 6
- 239000002244 precipitate Substances 0.000 description 5
- 239000000243 solution Substances 0.000 description 5
- 239000003153 chemical reaction reagent Substances 0.000 description 4
- 239000003638 chemical reducing agent Substances 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 229910052804 chromium Inorganic materials 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 3
- 238000005345 coagulation Methods 0.000 description 3
- 230000015271 coagulation Effects 0.000 description 3
- 239000011790 ferrous sulphate Substances 0.000 description 3
- 235000003891 ferrous sulphate Nutrition 0.000 description 3
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 description 3
- 229910000359 iron(II) sulfate Inorganic materials 0.000 description 3
- 229910021578 Iron(III) chloride Inorganic materials 0.000 description 2
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 2
- 229910001447 ferric ion Inorganic materials 0.000 description 2
- 229960002089 ferrous chloride Drugs 0.000 description 2
- 229910001448 ferrous ion Inorganic materials 0.000 description 2
- NMCUIPGRVMDVDB-UHFFFAOYSA-L iron dichloride Chemical compound Cl[Fe]Cl NMCUIPGRVMDVDB-UHFFFAOYSA-L 0.000 description 2
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 description 2
- RUTXIHLAWFEWGM-UHFFFAOYSA-H iron(3+) sulfate Chemical compound [Fe+3].[Fe+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O RUTXIHLAWFEWGM-UHFFFAOYSA-H 0.000 description 2
- 229910000360 iron(III) sulfate Inorganic materials 0.000 description 2
- NCNCGGDMXMBVIA-UHFFFAOYSA-L iron(ii) hydroxide Chemical compound [OH-].[OH-].[Fe+2] NCNCGGDMXMBVIA-UHFFFAOYSA-L 0.000 description 2
- 239000010985 leather Substances 0.000 description 2
- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical compound [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- DWAQJAXMDSEUJJ-UHFFFAOYSA-M Sodium bisulfite Chemical compound [Na+].OS([O-])=O DWAQJAXMDSEUJJ-UHFFFAOYSA-M 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- VQWFNAGFNGABOH-UHFFFAOYSA-K chromium(iii) hydroxide Chemical compound [OH-].[OH-].[OH-].[Cr+3] VQWFNAGFNGABOH-UHFFFAOYSA-K 0.000 description 1
- 238000004040 coloring Methods 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000001784 detoxification Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 229960004887 ferric hydroxide Drugs 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 1
- 150000004679 hydroxides Chemical class 0.000 description 1
- 239000008235 industrial water Substances 0.000 description 1
- 235000014413 iron hydroxide Nutrition 0.000 description 1
- -1 iron ions Chemical class 0.000 description 1
- IEECXTSVVFWGSE-UHFFFAOYSA-M iron(3+);oxygen(2-);hydroxide Chemical compound [OH-].[O-2].[Fe+3] IEECXTSVVFWGSE-UHFFFAOYSA-M 0.000 description 1
- 229910021506 iron(II) hydroxide Inorganic materials 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000010979 pH adjustment Methods 0.000 description 1
- 239000002957 persistent organic pollutant Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 235000010267 sodium hydrogen sulphite Nutrition 0.000 description 1
- 235000010265 sodium sulphite Nutrition 0.000 description 1
- 235000010269 sulphur dioxide Nutrition 0.000 description 1
- 239000006228 supernatant Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Landscapes
- Removal Of Specific Substances (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
- Compounds Of Iron (AREA)
Description
〔産業上の利用分野〕
この出願の発明は、メツキ・皮革工業などのよ
うに、水量は少ないが高濃度の六価クロム排水
や、ゴミ焼却炉からの洗浄排水のように、有機汚
濁が主体で数〜10ppmと比較的低濃度の六価クロ
ムを含む大量の連続排水等、各種の六価クロム含
有排水の浄水剤組成物に関するものである。
〔従来の技術〕
従来、この種の六価クロム含有排水の無害化処
理は、以下に示すような三段階の処理工程を経て
行われていた。
先ずPHを２〜３に調節したのち、六価クロム
を適当な還元剤で三価クロムに還元する。
Cr6+還元pH2〜３
――――――――→
Cr3+
クロムを再酸化しない酸化剤で過剰の還元剤
を分解除去する。
適当な凝集沈澱剤を添加してPHを５〜６に調
節し、沈澱剤と共に水酸化クロムを沈澱分離さ
せる。
Cr3+＋30H-沈澱pH2〜３
――――――――→
Cr(OH)3
上記の工程において、還元剤としては、亜硫酸
ソーダ・重亜硫酸ソーダ・亜硫酸ガス・硫酸第一
鉄・金属鉄などが通常に用いられているが、いず
れにしても上記三段階の処理工程を経なければな
らない。
〔発明が解決しようとする課題〕
しかしながら、メツキ・皮革工業などの高濃度
の六価クロム排水は、水量が少ないこともあり、
従来の三段階処理工程では、再酸化などのトラブ
ルに留意して行なわなければならないという課題
を有していた。
また、従来の三段階処理工程では、ゴミ焼却炉
からの洗浄排水のように、有機汚濁が主体で比較
的低濃度の六価クロムを含む大量の連続排水は、
有機汚濁の同時処理ができないという課題を有し
ていた。
そこで、この出願の発明は、六価クロム含有排
水の一段階処理が可能な特性を有し、しかも有機
汚濁の同時処理を可能とした六価クロム含有排水
の浄水剤組成物を提供することを目的としてなさ
れたものである。
〔課題を解決するための手段〕
この出願の請求項１記載の発明の六価クロム含
有排水の浄水剤組成物は、第一鉄：第二鉄の比率
が１：２以上の鉄塩水溶液とした。そして、この
比率であれば、全鉄分の含有量は問わないものと
した。
この出願の請求項２記載の発明の六価クロム含
有排水の浄水剤組成物は、第一鉄：第二鉄の比率
が１：２〜10で、50ｇ／以上の全鉄分を含有す
る鉄塩水溶液とした。
この出願の請求項３記載の発明の六価クロム含
有排水の浄水剤組成物は、前記請求項１または２
記載の発明と同様の構成において、鉄塩水溶液
を、硫酸または塩酸の鉄塩水溶液とした。
〔作用〕
上記の手段を施した結果、この出願の発明の六
価クロム含有排水の浄水剤組成物は、六価クロム
含有排水に添加して撹拌することにより、六価ク
ロムは第一鉄イオンで還元されて無害の三価クロ
ムとなり、PHを中性付近に調節することによつて
第二鉄イオンと共に水酸化物となり、有機汚濁を
凝集して沈澱分離する。
通常では、水酸化第一鉄は大きな溶解度をもつ
ので、凝集沈澱後の放流水に鉄イオンとして溶出
して排水基準をクリアーできないが、鉄イオンの
原子価の比率を
Fe2+：Fe3+＝１：ｎ （ｎ≧２）
に維持すれば、第一鉄イオンは第二鉄イオンと共
に水酸化鉄（）鉄（）となり
Fe2+＋2Fe3+＋80H-
＝Fe〔〕Fe〔〕2（OH）8
のように沈澱分離する。この水酸化物沈澱は、一
般に知られている水酸化第二鉄と同様に、中性付
近における溶解性が非常に小さいので、放流水中
に溶出することなく排出基準を容易にクリアーで
きる。
〔実施例〕
以下、この出願の発明の六価クロム含有排水の
浄水剤組成物を実施例に従つて説明する。
実施例 １〜３
硫酸第一鉄水溶液（Fe2+として50ｇ／）と
硫酸第二鉄水溶液（Fe3+として50ｇ／）を、
いずれも試薬特級を用いて調製した。そして、こ
れら二種類の溶液を、１：２、１：３、１：10の
比率でそれぞれ混合し、この出願の発明の六価ク
ロム含有排水の浄水剤組成物を得た。
比較例 １〜３
実施例１〜３と同様に、硫酸第一鉄水溶液
（Fe2+として50ｇ／）と硫酸第二鉄水溶液
（Fe3+として50ｇ／）を、いずれも試薬特級を
用いて調製した。そして、これら二種類の溶液
を、０：１、１：０、１：１の比率でそれぞれ混
合し、浄水剤組成物を得た。
実施例 ４〜６
塩化第一鉄水溶液（Fe2+として50ｇ／）と
塩化第二鉄水溶液（Fe3+として50ｇ／）を、
いずれも試薬特級を用いて調製した。そして、こ
れら二種類の溶液を、１：２、１：３、１：10の
比率でそれぞれ混合し、この出願の発明の六価ク
ロム含有排水の浄水剤組成物を得た。
比較例 ４〜６
実施例４〜６と同様に、塩化第一鉄水溶液
（Fe2+として50ｇ／）と塩化第二鉄水溶液
（Fe3+として50ｇ／）を、いずれも試薬特級を
用いて調製した。そして、これら二種類の溶液
を、０：１、１：０、１：１の比率でそれぞれ混
合し、浄水剤組成物を得た。
次に、上記実施例及び比較例で得た浄水剤組成
物のゴミ焼却炉の洗浄排水に対する処理結果を、
表１及び表２に示す。
処理方法
先ず、上記実施例及び比較例で得た浄水剤組成
物を、別に入手したゴミ焼却炉の洗浄排水に対し
全鉄分が200ppmとなるように添加して撹拌し、
水酸化ナトリウム水溶液を用いてPHを7.0とした。
この沈澱後の上澄み水溶液中の汚濁度をCOD、
SSで、着色度を色度で、その他六価クロム、全
鉄分と共にJIS−K0101（工業用水試験方法）及び
JIS−K0102（工場排水試験方法）を用いて分析し
た。尚、沈澱嵩は、PH調整後200mm／100mlのシリ
ンダー中での15分後の高さの相対比較とした。
[Industrial Field of Application] The invention of this application is applicable to wastewater produced mainly by organic pollution, such as wastewater produced by Metsuki Leather Industry, which uses a small amount of water but has a high concentration of hexavalent chromium, or wastewater used for washing from garbage incinerators. The present invention relates to a water purifier composition for various types of wastewater containing hexavalent chromium, such as large amounts of continuous wastewater containing relatively low concentrations of hexavalent chromium, such as several to 10 ppm. [Prior Art] Conventionally, this type of detoxification treatment of hexavalent chromium-containing wastewater has been carried out through a three-stage treatment process as shown below. First, the pH is adjusted to 2 to 3, and then hexavalent chromium is reduced to trivalent chromium using a suitable reducing agent. Cr 6+ reduction pH 2 to 3 ――――――――→ Decompose and remove excess reducing agent with an oxidizing agent that does not re-oxidize Cr 3+ chromium. A suitable coagulation and precipitant is added to adjust the pH to 5 to 6, and chromium hydroxide is separated by precipitation together with the precipitant. Cr 3+ +30H -Precipitation pH 2~3 -----------→ Cr(OH) 3 In the above process, the reducing agents include sodium sulfite, sodium bisulfite, sulfur dioxide gas, ferrous sulfate, and metallic iron. etc. are commonly used, but in any case, the above-mentioned three steps must be performed. [Problem to be solved by the invention] However, the amount of high-concentration hexavalent chromium wastewater from Metsuki and Leather Industries, etc. is small,
The conventional three-stage treatment process had the problem of having to be careful of troubles such as re-oxidation. In addition, in the conventional three-stage treatment process, large amounts of continuous wastewater, such as cleaning wastewater from garbage incinerators, are mainly organic pollutants and contain relatively low concentrations of hexavalent chromium.
The problem was that it was not possible to simultaneously treat organic pollution. Therefore, the invention of this application aims to provide a water purifying agent composition for hexavalent chromium-containing wastewater that has characteristics that enable one-step treatment of hexavalent chromium-containing wastewater and also enables simultaneous treatment of organic pollution. It was done for a purpose. [Means for Solving the Problems] The water purifying agent composition for wastewater containing hexavalent chromium of the invention according to claim 1 of this application comprises an iron salt aqueous solution having a ferrous:ferric iron ratio of 1:2 or more. did. As long as this ratio is maintained, the total iron content does not matter. The water purifying agent composition for hexavalent chromium-containing wastewater of the invention according to claim 2 of this application is an iron salt having a ferrous:ferric iron ratio of 1:2 to 10 and containing a total iron content of 50 g/or more. It was made into an aqueous solution. The water purifying agent composition for wastewater containing hexavalent chromium according to the invention according to claim 3 of this application is characterized in that the composition according to claim 1 or 2
In a configuration similar to the described invention, the iron salt aqueous solution was an iron salt aqueous solution of sulfuric acid or hydrochloric acid. [Operation] As a result of the above-mentioned measures, the water purifying agent composition for wastewater containing hexavalent chromium of the invention of this application can be added to wastewater containing hexavalent chromium and stirred to convert hexavalent chromium into ferrous ions. It is reduced to harmless trivalent chromium, and by adjusting the pH to around neutrality, it becomes hydroxide along with ferric ions, which coagulates organic contaminants and separates them by precipitation. Normally, ferrous hydroxide has a high solubility, so it elutes as iron ions into the discharged water after coagulation and precipitation, and cannot pass wastewater standards . If it is maintained at =1:n (n≧2), ferrous ions and ferric ions become iron hydroxide ()iron(), and Fe 2+ +2Fe 3+ +80H - = Fe[]Fe[] 2 ( OH) Precipitate and separate as in 8 . This hydroxide precipitate, like the generally known ferric hydroxide, has very low solubility near neutrality, so it can easily meet the discharge standards without being eluted into the effluent water. [Example] Hereinafter, the water purifying agent composition for waste water containing hexavalent chromium of the invention of this application will be explained according to Examples. Examples 1 to 3 Ferrous sulfate aqueous solution (50 g/as Fe 2+ ) and ferric sulfate aqueous solution (50 g/as Fe 3+ ),
All were prepared using special grade reagents. These two types of solutions were mixed at a ratio of 1:2, 1:3, and 1:10, respectively, to obtain a water purifier composition for hexavalent chromium-containing wastewater according to the invention of this application. Comparative Examples 1 to 3 As in Examples 1 to 3, a ferrous sulfate aqueous solution (50 g/as Fe 2+ ) and a ferric sulfate aqueous solution (50 g/ as Fe 3+ ) were both used as special grade reagents. Prepared. These two types of solutions were mixed at a ratio of 0:1, 1:0, and 1:1, respectively, to obtain a water purifier composition. Examples 4 to 6 Ferrous chloride aqueous solution (50 g/as Fe 2+ ) and ferric chloride aqueous solution (50 g/as Fe 3+ ),
All were prepared using special grade reagents. These two types of solutions were mixed at a ratio of 1:2, 1:3, and 1:10, respectively, to obtain a water purifier composition for hexavalent chromium-containing wastewater according to the invention of this application. Comparative Examples 4 to 6 Similarly to Examples 4 to 6, a ferrous chloride aqueous solution (50 g/as Fe 2+ ) and a ferric chloride aqueous solution (50 g/as Fe 3+ ) were both used as special grade reagents. Prepared. These two types of solutions were mixed at a ratio of 0:1, 1:0, and 1:1, respectively, to obtain a water purifier composition. Next, the treatment results of the water purifier compositions obtained in the above Examples and Comparative Examples on cleaning wastewater from garbage incinerators are as follows:
Shown in Tables 1 and 2. Treatment method: First, the water purifier compositions obtained in the above Examples and Comparative Examples were added to separately obtained cleaning wastewater from a garbage incinerator so that the total iron content was 200 ppm, and the mixture was stirred.
The pH was adjusted to 7.0 using an aqueous sodium hydroxide solution.
The degree of pollution in the supernatant aqueous solution after precipitation is COD,
In SS, the degree of coloring is expressed as chromaticity, along with other hexavalent chromium and total iron content, according to JIS-K0101 (industrial water test method).
Analyzed using JIS-K0102 (factory wastewater test method). The sediment volume was a relative comparison of the height after 15 minutes in a 200 mm/100 ml cylinder after pH adjustment.
【表】【table】
この出願の発明の六価クロム含有排水の浄水剤
組成物は、以上に述べたように構成されるている
ので、六価クロムを含有する汚濁排水の同時処理
に用いると、従来から行われている六価クロムを
含有する汚濁排水の処理のように、六価クロムの
還元→過剰の還元剤の分解→汚濁成分の凝集沈澱
のような煩雑なプロセスを必要とせず、一薬剤の
一工程のみで両者の無害化分離ができるので、処
理コストの低減と設備の簡易化が図れる。
また、このFe〔〕Fe〔〕2（OH）8の沈澱は、
通常のFe（OH）2の沈澱よりも沈澱嵩が少ないの
で、沈澱分離・汚泥脱水などの後処理が有利にな
る。
Since the water purifying agent composition for wastewater containing hexavalent chromium of the invention of this application is configured as described above, it can be used for the simultaneous treatment of polluted wastewater containing hexavalent chromium, which has not been done conventionally. Unlike the treatment of polluted wastewater containing hexavalent chromium, there is no need for complicated processes such as reduction of hexavalent chromium → decomposition of excess reducing agent → coagulation and sedimentation of pollutant components, and only one step with one agent is required. Since the two can be separated and rendered harmless, processing costs can be reduced and equipment simplified. Moreover, this precipitation of Fe[]Fe[] 2 (OH) 8 is
Since the precipitate volume is smaller than normal Fe(OH) 2 precipitate, post-treatments such as precipitate separation and sludge dewatering are advantageous.
Claims (1)
溶液としたことを特徴とする六価クロム含有排水
の浄水剤組成物。 ２ 第一鉄：第二鉄の比率が１：２〜10で、50
ｇ／以上の全鉄分を含有する鉄塩水溶液とした
ことを特徴とする六価クロム含有排水の浄水剤組
成物。 ３ 鉄塩水溶液を、硫酸まは塩酸の鉄塩水溶液と
したことを特徴とする請求項１または２記載の六
価クロム含有排水の浄水剤組成物。[Scope of Claims] 1. A water purifier composition for wastewater containing hexavalent chromium, characterized in that it is an aqueous iron salt solution with a ferrous:ferric iron ratio of 1:2 or more. 2 The ratio of 1st iron: 2nd iron is 1:2 to 10, and 50
A water purifying agent composition for wastewater containing hexavalent chromium, characterized in that it is an aqueous iron salt solution containing a total iron content of at least g/g/g/g. 3. The water purifier composition for hexavalent chromium-containing wastewater according to claim 1 or 2, wherein the iron salt aqueous solution is an iron salt aqueous solution of sulfuric acid or hydrochloric acid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19576189A JPH0360795A (en) | 1989-07-27 | 1989-07-27 | Composition as water purifying agent for waste water containing hexavalent chromium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19576189A JPH0360795A (en) | 1989-07-27 | 1989-07-27 | Composition as water purifying agent for waste water containing hexavalent chromium |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0360795A JPH0360795A (en) | 1991-03-15 |
| JPH0336595B2 true JPH0336595B2 (en) | 1991-05-31 |
Family
ID=16346521
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19576189A Granted JPH0360795A (en) | 1989-07-27 | 1989-07-27 | Composition as water purifying agent for waste water containing hexavalent chromium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0360795A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001293485A (en) * | 2000-04-12 | 2001-10-23 | Kurita Water Ind Ltd | Method and apparatus for treating hexavalent chromium-containing wastewater |
-
1989
- 1989-07-27 JP JP19576189A patent/JPH0360795A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0360795A (en) | 1991-03-15 |
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