JPH0360795A - Composition as water purifying agent for waste water containing hexavalent chromium - Google Patents
Composition as water purifying agent for waste water containing hexavalent chromiumInfo
- Publication number
- JPH0360795A JPH0360795A JP19576189A JP19576189A JPH0360795A JP H0360795 A JPH0360795 A JP H0360795A JP 19576189 A JP19576189 A JP 19576189A JP 19576189 A JP19576189 A JP 19576189A JP H0360795 A JPH0360795 A JP H0360795A
- Authority
- JP
- Japan
- Prior art keywords
- hexavalent chromium
- purifying agent
- waste water
- iron
- water
- 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.)
- Granted
Links
- 239000002351 wastewater Substances 0.000 title claims abstract description 32
- JOPOVCBBYLSVDA-UHFFFAOYSA-N chromium(6+) Chemical compound [Cr+6] JOPOVCBBYLSVDA-UHFFFAOYSA-N 0.000 title claims abstract description 29
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 26
- 239000012629 purifying agent Substances 0.000 title claims abstract description 12
- 239000000203 mixture Substances 0.000 title claims description 19
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 41
- 229910052742 iron Inorganic materials 0.000 claims abstract description 13
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 claims abstract description 9
- 150000002505 iron Chemical class 0.000 claims abstract description 9
- VTLYFUHAOXGGBS-UHFFFAOYSA-N Fe3+ Chemical compound [Fe+3] VTLYFUHAOXGGBS-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000007864 aqueous solution Substances 0.000 claims description 16
- 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 4
- 239000012266 salt solution Substances 0.000 claims 1
- 238000011282 treatment Methods 0.000 abstract description 16
- 239000011651 chromium Substances 0.000 abstract description 9
- -1 iron ions Chemical class 0.000 abstract description 6
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 abstract description 5
- 229910052804 chromium Inorganic materials 0.000 abstract description 5
- 229910001448 ferrous ion Inorganic materials 0.000 abstract description 4
- 239000003344 environmental pollutant Substances 0.000 abstract description 3
- 229910001447 ferric ion Inorganic materials 0.000 abstract description 3
- 231100000719 pollutant Toxicity 0.000 abstract description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 abstract description 2
- 238000000926 separation method Methods 0.000 abstract description 2
- 239000010802 sludge Substances 0.000 abstract description 2
- 230000018044 dehydration Effects 0.000 abstract 1
- 238000006297 dehydration reaction Methods 0.000 abstract 1
- 230000007935 neutral effect Effects 0.000 abstract 1
- 230000001105 regulatory effect Effects 0.000 abstract 1
- 239000013049 sediment Substances 0.000 abstract 1
- 239000007787 solid Substances 0.000 abstract 1
- 238000001556 precipitation Methods 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 7
- 238000000034 method Methods 0.000 description 6
- 239000000243 solution Substances 0.000 description 5
- 239000003153 chemical reaction reagent Substances 0.000 description 4
- 238000004140 cleaning Methods 0.000 description 4
- 239000002244 precipitate Substances 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 239000003638 chemical reducing agent Substances 0.000 description 3
- 238000005345 coagulation Methods 0.000 description 3
- 230000015271 coagulation Effects 0.000 description 3
- NCNCGGDMXMBVIA-UHFFFAOYSA-L iron(ii) hydroxide Chemical compound [OH-].[OH-].[Fe+2] NCNCGGDMXMBVIA-UHFFFAOYSA-L 0.000 description 3
- 239000002957 persistent organic pollutant Substances 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- 229910021578 Iron(III) chloride Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229960002089 ferrous chloride Drugs 0.000 description 2
- 239000011790 ferrous sulphate Substances 0.000 description 2
- 235000003891 ferrous sulphate Nutrition 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
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 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
- 229910000359 iron(II) sulfate Inorganic materials 0.000 description 2
- 229910000360 iron(III) sulfate Inorganic materials 0.000 description 2
- 239000010985 leather Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 241000282472 Canis lupus familiaris Species 0.000 description 1
- VQWFNAGFNGABOH-UHFFFAOYSA-K chromium(iii) hydroxide Chemical compound [OH-].[OH-].[OH-].[Cr+3] VQWFNAGFNGABOH-UHFFFAOYSA-K 0.000 description 1
- 230000001112 coagulating effect Effects 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
- 229960004887 ferric hydroxide Drugs 0.000 description 1
- 150000003840 hydrochlorides Chemical class 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
- 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
- 150000003839 salts Chemical class 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 150000003467 sulfuric acid derivatives Chemical class 0.000 description 1
- 239000006228 supernatant Substances 0.000 description 1
Landscapes
- Removal Of Specific Substances (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
- Compounds Of Iron (AREA)
Abstract
Description
【発明の詳細な説明】
〔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〜１０ｐｐ
ｍ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。[Detailed Description of the Invention] [Industrial Application Field] The invention of this application is applicable to wastewater from waste incinerators such as Metsuki Leather Industries, etc., which uses hexavalent chromium wastewater with a small amount of water but high concentration, and wastewater from cleaning waste from garbage incinerators. As such, organic pollution is the main component, ranging from several to 10pp.
The present invention relates to a water purifying agent composition for various kinds of wastewater containing hexavalent chromium, such as large amounts of continuous wastewater containing relatively low concentrations of hexavalent chromium.
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。Conventionally, this type of detoxification treatment of hexavalent chromium-containing wastewater has been carried out through a three-stage treatment process as shown below.
■ 先ずｐａｌ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。(2) First, pal is adjusted to 2 to 3, and then hexavalent chromium is reduced to trivalent chromium using a suitable reducing agent.
■ 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。■ Decompose and remove excess reducing agent using an oxidizing agent that does not re-oxidize chromium.
■ 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。■ Adjust the pH to 5 to 6 by adding an appropriate coagulating precipitant, and precipitate and separate chromium hydroxide together with the precipitant. Single iron, metallic iron, etc. are commonly used, but in any case, the three steps described above must be completed.
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。However, since the amount of water used for high-concentration hexavalent chromium wastewater from Metsuki and leather industries is small, the conventional three-stage treatment process has the problem of having to be careful of problems such as re-oxidation. was.
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。In addition, in the conventional three-stage treatment process, large amounts of continuous wastewater, such as cleaning wastewater from garbage incinerators, which are mainly organic pollutants and contain relatively low concentrations of hexavalent chromium, cannot be treated simultaneously with organic pollutants. I had an issue.
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。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.
〔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ｌ：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。[Means for Solving the Problems] The water purifying agent composition for hexavalent chromium-containing wastewater according to the invention set forth in 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.
この出願の請求項２記載の発明の六価クロム含有υ１水
の浄水剤組成物は、第一鉄：第二鉄の比率が１：２〜１
０で、５０ｇ／１以上の全鉄分を含有する鉄塩水溶液と
した。The water purifier composition for hexavalent chromium-containing υ1 water according to the invention according to claim 2 of this application has a ferrous:ferric iron ratio of 1:2 to 1.
0, and an iron salt aqueous solution containing a total iron content of 50 g/1 or more.
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。The water purifying agent composition for hexavalent chromium-containing wastewater according to the invention set forth in claim 3 of this application has the same configuration as the invention set forth in claim 1 or 2, in which an iron salt aqueous solution is mixed with an iron salt aqueous solution of sulfuric acid or hydrochloric acid. did.
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
して攪拌することにより、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
調節することによっ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。As a result of the above 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, so that hexavalent chromium is reduced by ferrous ions. It becomes harmless trivalent chromium, and by adjusting the pH to around neutrality, it becomes hydroxide together with ferric ions, which coagulates organic contaminants and separates them by precipitation.
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
Ｆｅ”° ：Ｆｅ”＝ 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（ｎ）鉄（Ｉ［［）となり
Ｆｅ！＋＋２ Ｆｅ” ＋８０Ｂ−
＝ Ｆｅ （ＩＩ） Ｆｅ （Ｉ［［］ｚ（ＯＨ
）ａのように沈澱分離する。この水酸化物沈澱は、−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。Normally, ferrous hydroxide has a high solubility, so it elutes as iron ions into the discharged water after coagulation and precipitation, and cannot pass the wastewater standards. However, the valence ratio of iron ions is determined by 1: n (n≧2
), the ferrous ion and ferric ion form iron hydroxide (n) iron (I[[), which becomes Fe! ++2 Fe" +80B- = Fe (II) Fe (I[[]z(OH
) Separate by precipitation as in a. This hydroxide precipitate, like the generally known ferric hydroxide, has very low solubility in the vicinity of neutrality, so it can easily meet the discharge standards without being eluted into the effluent water.
以下、この出願の発明の六価クロム含有排水の浄水剤組
成物を実施例に従って説明する。Hereinafter, the water purifying agent composition for waste water containing hexavalent chromium according to the invention of this application will be explained according to Examples.
実施例１〜３
硫酸第一鉄水溶液（Ｆｅ”として５０ｇ／ ｌ ）と硫
酸第二鉄水溶液（Ｆｅ”として５０ｇ／ ｌ ）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：ｌＯ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。Examples 1 to 3 A ferrous sulfate aqueous solution (50 g/l as Fe") and a ferric sulfate aqueous solution (50 g/l as Fe") were both prepared using special grade reagents. These two types of solutions were mixed at a ratio of 1:2.1:3.1:1O to obtain a water purifier composition for hexavalent chromium-containing wastewater according to the invention of this application.
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／ ｌ ） と硫酸第二鉄水溶液（Ｆｅ”
として５０ｇ／ ｌ ）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、０：１１：
０、ｌ：１の比率でそれぞれ混合し、浄水剤組成物を得
た。Comparative Examples 1 to 3 Similar to Examples 1 to 3, ferrous sulfate aqueous solution (Fe2+
50g/l) and ferric sulfate aqueous solution (Fe”
(50 g/l) were prepared using special grade reagents. Then, these two types of solutions were mixed at 0:11:
They were mixed at a ratio of 0 and 1:1 to obtain a water purifier composition.
実施例４〜６
塩化第一鉄水溶：ａ（Ｆｅ”としテ５０ｇ／ｆｆ１）
（！：塩化第二鉄水溶液（Ｆｅ”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：ｌＯ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。Examples 4 to 6 Ferrous chloride aqueous solution: a (Fe” 50g/ff1)
(!: 50g#' as ferric chloride aqueous solution (Fe''))
were prepared using special grade reagents. These two types of solutions were mixed at a ratio of 1:2.1:3.1:1O to obtain a water purifier composition for hexavalent chromium-containing wastewater according to the invention of this application.
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／ ｌ ）と塩化第二鉄水溶液（Ｆｅ”とし
て５０ｇ／ ｌ ）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、Ｏ：１１：０．
１：１の比率でそれぞれ混合し、浄水剤組成物を得た。Comparative Examples 4 to 6 Similarly to Examples 4 to 6, a ferrous chloride aqueous solution (50 g/l as Fe2) and a ferric chloride aqueous solution (50 g/l as Fe) were prepared using special grade reagents. Then, these two kinds of solutions were mixed with O:11:0.
They were mixed at a ratio of 1:1 to obtain a water purifier composition.
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。Next, Tables 1 and 2 show the results of treatment of the water purifier compositions obtained in the above Examples and Comparative Examples with respect to cleaning wastewater from waste incinerators.
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ＪＪＦ−水に対し全鉄分が
２００ｐｐｍとなるように添加して攪拌し、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−ＫＯ
ＩＯＩ （工業用水試験方法）及びＪＩＳ−ＫＯ１０２
（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２００ａｕｍ／１００ｉ１のシリンダー中
での１５分後の高さの相対比較とした。Treatment method: First, the water purifier compositions obtained in the above Examples and Comparative Examples were added to JJF-Water for cleaning garbage incinerators obtained separately so that the total iron content was 200 ppm, and the mixture was stirred and mixed with an aqueous sodium hydroxide solution. The pH was adjusted to 7.0 using The degree of turbidity in the supernatant aqueous solution after precipitation is determined by COD and SS, the degree of coloration is determined by chromaticity, and JIS-KO is determined along with hexavalent chromium and total iron.
IOI (Industrial Water Test Method) and JIS-KO102
(factory wastewater test method). Incidentally, the sedimentation volume was a relative comparison of the height 15 minutes after being placed in a 200 amu/100i1 cylinder after pH adjustment.
（以下余白）
＊：沈殿しないため測ご不能
表２
＊：沈澱しないたぬ何名不能
上記処理結果より、未処理の排水に対して、Ｆｅ３ ＋
のみ（比較例１．４）ではＣｒ”が、Ｆｅ”のみ（比較
例２．５）ではＣＯＤ、ＳＳが、それぞれ除去されてい
ないことがわかる。(Leaving space below) *: Unable to measure because it does not precipitate Table 2 *: How many dogs do not precipitate? From the above treatment results, Fe3 +
It can be seen that Cr" was not removed in the case of only Fe" (Comparative Example 1.4), and COD and SS were not removed in the case of Fe" only (Comparative Example 2.5).
一方、Ｆｅ” ： Ｆｅ”の比率が１ ：１（比較例
３．６）では、Ｃｒ”は不溶化沈澱し除去されているが
、鉄イオンは不溶化せず除去されていないことがわかる
。On the other hand, it can be seen that when the ratio of Fe":Fe" was 1:1 (Comparative Example 3.6), Cr" was insolubilized and precipitated and removed, but iron ions were not insolubilized and removed.
しかし、Ｆｅ２° ：Ｆｅ”の比率が１ ＝２以上（実
施例１〜６）になると、Ｃｒ”と共にＣＯＤ、ＳＳも除
去されて、鉄イオンも不溶化沈澱し、除去されることが
わかる。However, it can be seen that when the ratio of Fe2°:Fe'' becomes 1 = 2 or more (Examples 1 to 6), COD and SS are also removed along with Cr'', and iron ions are also insolubilized and precipitated and removed.
尚、鉄塩としては、上記硫酸塩、塩酸塩のほかに、ポリ
硫酸塩等、通常の有機汚濁成分の凝集沈澱に使われてい
る塩類が使用できる。As the iron salt, in addition to the above-mentioned sulfates and hydrochlorides, salts such as polysulfates, which are commonly used for coagulation and precipitation of organic pollutant components, can be used.
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、−
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。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, it does not require complicated processes such as reduction of hexavalent chromium, decomposition of excess reducing agent, and coagulation and precipitation of pollutant components.
Since both chemicals can be separated into harmless substances in just one process, processing costs can be reduced and equipment can be simplified.
また、このＦ６ （ＩＩ） Ｆｅ （Ｉ［Ｉ］ ｚ
（ＯＨ）ｓの沈澱は、通常のＦ ｅ（ＯＨ） ｓ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。Also, this F6 (II) Fe (I[I] z
Since the precipitation of (OH)s has a smaller precipitation volume than the usual precipitation of Fe(OH)s, post-treatments such as precipitation separation and sludge dewatering are advantageous.
Claims (1)
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／ｌ
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、硫酸また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。[Claims] 1. A water purifier composition for wastewater containing hexavalent chromium, which is an aqueous iron salt solution having a ferrous:ferric iron ratio of 1:2 or more. 2. Ferrous: ferric iron ratio is 1:2-10, 50/l
A water purifying agent composition for wastewater containing hexavalent chromium, characterized in that it is an iron salt aqueous solution containing the above total iron content. 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 true JPH0360795A (en) | 1991-03-15 |
| JPH0336595B2 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) |
Cited By (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
Cited By (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 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0336595B2 (en) | 1991-05-31 |
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