JPH0231888A - Treatment of heavy metal waste water containing cyanide - Google Patents
Treatment of heavy metal waste water containing cyanideInfo
- Publication number
- JPH0231888A JPH0231888A JP18150688A JP18150688A JPH0231888A JP H0231888 A JPH0231888 A JP H0231888A JP 18150688 A JP18150688 A JP 18150688A JP 18150688 A JP18150688 A JP 18150688A JP H0231888 A JPH0231888 A JP H0231888A
- Authority
- JP
- Japan
- Prior art keywords
- waste water
- cyanide
- heavy metal
- contg
- heavy metals
- 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.)
- Pending
Links
- XFXPMWWXUTWYJX-UHFFFAOYSA-N Cyanide Chemical compound N#[C-] XFXPMWWXUTWYJX-UHFFFAOYSA-N 0.000 title claims abstract description 31
- 229910001385 heavy metal Inorganic materials 0.000 title claims abstract description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title abstract description 5
- 239000010814 metallic waste Substances 0.000 title abstract description 4
- 239000002351 wastewater Substances 0.000 claims abstract description 21
- XLJMAIOERFSOGZ-UHFFFAOYSA-N cyanic acid Chemical compound OC#N XLJMAIOERFSOGZ-UHFFFAOYSA-N 0.000 claims abstract description 16
- 238000010438 heat treatment Methods 0.000 claims abstract description 6
- 150000002500 ions Chemical class 0.000 claims abstract description 6
- 229910052596 spinel Inorganic materials 0.000 claims abstract description 4
- 239000011029 spinel Substances 0.000 claims abstract description 4
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 claims abstract description 3
- 238000000034 method Methods 0.000 claims description 16
- 239000000460 chlorine Substances 0.000 claims description 5
- 229910052801 chlorine Inorganic materials 0.000 claims description 5
- -1 chlorine ions Chemical class 0.000 claims description 4
- 150000001875 compounds Chemical class 0.000 claims description 2
- 229910001448 ferrous ion Inorganic materials 0.000 claims description 2
- 238000005273 aeration Methods 0.000 claims 1
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 abstract description 6
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 abstract description 4
- 239000003513 alkali Substances 0.000 abstract description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 3
- 229910052725 zinc Inorganic materials 0.000 abstract description 3
- 229910052742 iron Inorganic materials 0.000 abstract description 2
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 abstract description 2
- 229910000359 iron(II) sulfate Inorganic materials 0.000 abstract description 2
- 239000012286 potassium permanganate Substances 0.000 abstract description 2
- 239000011780 sodium chloride Substances 0.000 abstract description 2
- JMANVNJQNLATNU-UHFFFAOYSA-N oxalonitrile Chemical compound N#CC#N JMANVNJQNLATNU-UHFFFAOYSA-N 0.000 abstract 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 abstract 1
- 241000408495 Iton Species 0.000 abstract 1
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 abstract 1
- 229910052802 copper Inorganic materials 0.000 abstract 1
- 230000001590 oxidative effect Effects 0.000 abstract 1
- 235000011149 sulphuric acid Nutrition 0.000 abstract 1
- 239000007788 liquid Substances 0.000 description 8
- 229910000859 α-Fe Inorganic materials 0.000 description 8
- 239000002699 waste material Substances 0.000 description 5
- 239000007789 gas Substances 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 125000004093 cyano group Chemical group *C#N 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 238000009423 ventilation Methods 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- KZBUYRJDOAKODT-UHFFFAOYSA-N Chlorine Chemical compound ClCl KZBUYRJDOAKODT-UHFFFAOYSA-N 0.000 description 2
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- 239000003929 acidic solution Substances 0.000 description 2
- 239000012670 alkaline solution Substances 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- QWPPOHNGKGFGJK-UHFFFAOYSA-N hypochlorous acid Chemical compound ClO QWPPOHNGKGFGJK-UHFFFAOYSA-N 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- 239000011701 zinc Substances 0.000 description 2
- 241001385733 Aesculus indica Species 0.000 description 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- 239000005708 Sodium hypochlorite Substances 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 150000007661 iron cyano complex Chemical class 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 150000002825 nitriles Chemical class 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical compound [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 description 1
- 239000006228 supernatant Substances 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 150000003751 zinc Chemical class 0.000 description 1
Landscapes
- Removal Of Specific Substances (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は各種研究機関、大学等から排出されるシアン含
有重金属廃水の処理方法に関するものである。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for treating cyanide-containing heavy metal wastewater discharged from various research institutes, universities, etc.
［従来の技術およびその課題］
従来、各種研究機関、大学等から排出される廃液は、主
にフェライト法、中和凝沈法による処理が行われてきた
。フェライト法は、特に種々の重金属が混入する廃液の
一括処理に対して有効であるが、シアンが含有されてい
る場合には、このシアンをあらかじめ分別しておくこと
が原則である。[Prior art and its problems] Conventionally, waste liquid discharged from various research institutes, universities, etc. has been mainly treated by the ferrite method and the neutralization coagulation method. The ferrite method is particularly effective for bulk treatment of waste liquids containing various heavy metals, but if cyanide is contained, it is a general rule to separate this cyanide in advance.
即ち、重金属廃液中にシアンが混入している場合、この
ような廃液にフェライト法を適用した時には、処理液に
重金属のシアノ錯体が残存する。That is, when cyanide is mixed in the heavy metal waste liquid, when the ferrite method is applied to such waste liquid, the heavy metal cyano complex remains in the treated liquid.
従って二次処理として焼却処分またはアルカリ塩素法等
のシアン分解処理が必要となる。Therefore, as a secondary treatment, cyanide decomposition treatment such as incineration or an alkali chlorine method is required.
焼却処分する場合には、高価な設備が必要であるばかり
でなく、多大な時間を要する。またアルカリ塩素法によ
る場合には、鉄シアノ錯体の分解効率が悪く、また使用
する次亜塩素酸は安定性に欠けるため保存に問題がある
。Incineration not only requires expensive equipment but also takes a lot of time. Furthermore, when using the alkali chlorine method, the decomposition efficiency of the iron cyano complex is poor, and the hypochlorous acid used lacks stability, resulting in storage problems.
ざらにシアノ錯体に亜鉛塩の存在下で還元剤を作用させ
て、フェロシアン化亜鉛として沈澱・除去する方法も提
案されているが、処理工程が複雑となり、フェライト法
の２次処理としては実用化が困難である。A method has also been proposed in which the cyano complex is treated with a reducing agent in the presence of a zinc salt to precipitate and remove it as zinc ferrocyanide, but the treatment process is complicated and it is not practical as a secondary treatment for the ferrite method. It is difficult to
本発明はこのような問題点を解決するためになされたも
ので、安定な試薬を用いて効率良くシアンを分解するこ
とのできるシアン含有重金属廃水の処理方法を提供する
ことを目的とする。The present invention was made to solve these problems, and an object of the present invention is to provide a method for treating cyanide-containing heavy metal wastewater that can efficiently decompose cyanide using a stable reagent.
［課題を解決するための手段］
本発明は、シアン含有重金属廃水に塩素イオンおよび過
マンガン酸イオンを加え、ｐ（１２以下で加熱しながら
通気してシアンを気散させた後、前記シアン含有通気カ
スについては、前記ガスをアルカリ液中に導入してシア
ン成分をシアン酸として回収した後、回収液のｐＨを７
．５〜８に保持（）て前記シアン酸を分解・除去し、残
存重金属廃水中の重金属については、前記廃水中に第１
鉄イオンを添加し、ｐＨ６以上で酸化して重金属イオン
を含むスピネル化合物を作成することにより除去するこ
とを特徴とするシアン含有重金属廃水の処理方法である
。[Means for Solving the Problems] The present invention includes adding chlorine ions and permanganate ions to cyanide-containing heavy metal wastewater, aerating the wastewater while heating at p(12 or less) to diffuse cyanide, and then dissolving the cyanide-containing heavy metal wastewater. Regarding ventilation scum, after introducing the gas into an alkaline solution and recovering the cyanide component as cyanic acid, the pH of the recovered solution was adjusted to 7.
．． 5 to 8 () to decompose and remove the cyanic acid, and remove residual heavy metals from the wastewater.
This is a method for treating cyanide-containing heavy metal wastewater, which is characterized in that iron ions are added and removed by oxidation at pH 6 or higher to create a spinel compound containing heavy metal ions.
［作用］
金属シアノ錯体の酸性溶液は加熱処理することで、成分
中のシアンが気散されやすくなり、また、空気等のガス
を通気することで気散速度も増大する。[Function] By heating the acidic solution of the metal cyano complex, the cyanide in the component becomes easily diffused, and by aerating gas such as air, the rate of vaporization increases.
一方、過マンガン酸イオンは酸性溶液中で強力な酸化剤
として働き、塩素イオンを塩素ガスとして気散ざける。On the other hand, permanganate ions act as strong oxidizing agents in acidic solutions, dissipating chlorine ions as chlorine gas.
気散した塩素ガスは、空気ガス中の中性水蒸気ミスト中
でシアンの一部をシアン酸に分解する。また未分解のシ
アンもアルカリ溶液中に吸収され、次亜塩素酸により、
シアン酸に分解する。その時の反応式は次に示す如くな
る。The diffused chlorine gas decomposes some of the cyanide into cyanic acid in the neutral water vapor mist in the air gas. In addition, undecomposed cyanide is absorbed into the alkaline solution, and hypochlorous acid
Decomposes into cyanic acid. The reaction formula at that time is as shown below.
ＣＪ２＋ ８２０ −＋ ＨＣｆ２＋Ｈ（、ｅ。CJ2+ 820 -+ HCf2+H (, e.
ＣＮ−＋ＨＩＪＯ→ＣＮα＋ＯＨ−
→哩 十ＨＯＣＮ
シアン酸はｐＨを中性にすることでざらに分解され、炭
酸ガス、窒素ガスおよび水に分解される。CN−+HIJO→CNα+OH− →哩 10HOCN Cyanic acid is roughly decomposed by making the pH neutral, and is decomposed into carbon dioxide gas, nitrogen gas, and water.
一方、シアンを気散・除去した重金属廃液は第１鉄イオ
ンを添加し、ｔ）８６以上で酸化する通常のフェライト
法により、処理が可能となる。この時、過剰に添加され
たマンカンはフェライト反応の妨害にはならない。On the other hand, the heavy metal waste liquid from which cyanide has been diffused and removed can be treated by the usual ferrite method in which ferrous ions are added and oxidized at t) 86 or more. At this time, excessively added mankan does not interfere with the ferrite reaction.
［実施例］ 次に本発明の実施例について説明する。[Example] Next, examples of the present invention will be described.
Ｆｅ １００ｍＭＩ 、Ｃｕ ５０ｍｑ／Ｎ 、Ｚｎ
５０ｍｑ＃！ 、全シアン３ｍ（］／ｊ’を含む模擬廃
水２０（７！を５００ａｌｔ？パラプルフラスコに取り
、５０％ｔｔ２ＳＯ４でＤＨ１，５にした後、ＮａｒＵ
２９、過マンガン酸カリウム１９を加え、９８°Ｃに加
熱しながら空気をｏ、５７／ｍｉｎの速度で３０分間通
気してシアンを気散・除去した。Fe 100mMI, Cu 50mq/N, Zn
50mq#! , 20 (7!) of simulated wastewater containing 3 m(]/j' of total cyanide was taken into a 500 alt? Paraple flask, and after adjusting the DH to 1.5 with 50% tt2SO4, NarU
29. Potassium permanganate 19 was added, and while heating to 98°C, air was passed through at a rate of 57/min for 30 minutes to diffuse and remove cyanide.
廃液中の全シアンは０．０５ｍ’ｊ／ｆ！であった。The total cyanide in the waste liquid is 0.05 m'j/f! Met.
通気した後の空気を２ Ｎ ＮａＯＨ５０威に導入して
洗浄・回収を行った。その後、塩酸でｐＨを７．５〜７
．７に調整して６０分間放置した。この溶液の全シアン
は０．１ｍｙ／ｌであった。The air after ventilation was introduced into 50% of 2N NaOH for washing and recovery. Then, adjust the pH to 7.5-7 with hydrochloric acid.
．． 7 and left for 60 minutes. The total cyanide in this solution was 0.1 my/l.
空気通気後の廃液にＦｅＳＯ４・７ｔ１２０１１ ’ｊ
を添加し、Ｎａ叶温溶液ｐＨを９．５に保ち、温度６５
°Ｃで空気を１ Ｒ／ｍｉｎの速度で通気してフェライ
ト反応を行った。９０分間後、黒色の磁性体が得られ、
上澄水の分析を行うと、ＦｅＯ，５４＃２以下、１ｒｉ
０．１ｍｇ／ｊ以下、Ｃｕ ０．１ｍｇ／ｆ！、全シア
ン０．０１ｍ’ｊ／１以下であった。FeSO4・7t12011'j in the waste liquid after air ventilation
was added, the pH of the Na leaf solution was kept at 9.5, and the temperature was 65.
The ferrite reaction was carried out at °C by passing air at a rate of 1 R/min. After 90 minutes, a black magnetic material was obtained,
Analysis of the supernatant water revealed that FeO, 54#2 or less, 1ri
0.1mg/j or less, Cu 0.1mg/f! , total cyan was less than 0.01 m'j/1.
以上のようにして効率よくシアン含有重金属廃水を処理
することができた。As described above, cyanide-containing heavy metal wastewater could be efficiently treated.
［発明の効果］
以上説明したように、本発明によれば、シアンを含有す
る重金属廃水に対して、複雑な工程を要することなく、
効率の良いフェライト化処理か可能となる。さらに、従
来のように保存性の悪い次亜塩素酸ナトリウムを用いる
ことなく、ＮａＣｌ！、Ｋ）Ｉｎ０４等の安定で汎用性
のある試薬を用いてシアンを分解・除去することができ
るので工業的に有利でおる。[Effects of the Invention] As explained above, according to the present invention, heavy metal wastewater containing cyanide can be treated without requiring complicated processes.
Efficient ferrite processing becomes possible. Furthermore, instead of using sodium hypochlorite, which has poor storage stability as in the past, NaCl! , K) It is industrially advantageous because cyanide can be decomposed and removed using a stable and versatile reagent such as In04.
Claims (1)
ガン酸イオンを加え、ｐＨ２以下で加熱しながら通気し
てシアンを気散させた後、前記シアン含有通気ガスにつ
いては、前記ガスをアルカリ液中に導入してシアン成分
をシアン酸として回収した後、回収液のｐＨを７．５〜
８に保持して前記シアン酸を分解・除去し、残存重金属
廃水中の重金属については、前記廃水中に第１鉄イオン
を添加し、ｐＨ６以上で酸化して重金属イオンを含むス
ピネル化合物を作成することにより除去することを特徴
とするシアン含有重金属廃水の処理方法。(1) Add chlorine ions and permanganate ions to cyanide-containing heavy metal wastewater, and diffuse cyanide by aeration while heating at pH 2 or below. After cyanide is introduced and the cyanide component is recovered as cyanic acid, the pH of the recovered solution is adjusted to 7.5 to 7.5.
8 to decompose and remove the cyanic acid, and for residual heavy metals in the wastewater, ferrous ions are added to the wastewater and oxidized at pH 6 or higher to create a spinel compound containing heavy metal ions. A method for treating cyanide-containing heavy metal wastewater, the method comprising removing heavy metal wastewater by removing cyanide.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18150688A JPH0231888A (en) | 1988-07-22 | 1988-07-22 | Treatment of heavy metal waste water containing cyanide |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18150688A JPH0231888A (en) | 1988-07-22 | 1988-07-22 | Treatment of heavy metal waste water containing cyanide |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0231888A true JPH0231888A (en) | 1990-02-01 |
Family
ID=16101954
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18150688A Pending JPH0231888A (en) | 1988-07-22 | 1988-07-22 | Treatment of heavy metal waste water containing cyanide |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0231888A (en) |
-
1988
- 1988-07-22 JP JP18150688A patent/JPH0231888A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4070281A (en) | Method for treating waste water | |
| US4419246A (en) | Removal of heavy metal ions | |
| EP0097478B1 (en) | Process for removal and recovery of mercury from waste water | |
| EA200000437A1 (en) | METHOD FOR REMOVING SELENIUM FROM TECHNOLOGICAL WATER FLOWS AND DEVICE FOR ITS IMPLEMENTATION | |
| WO2017073177A1 (en) | Method for treating cyanide complex-containing wastewater and treating agent for use therein | |
| JPH02139092A (en) | Method of detoxicating waste water containing element mercury | |
| JP2021053620A (en) | Treatment method for cyanide-containing wastewater | |
| JPH05345189A (en) | Method for treating organic halogen compound-containing waste water | |
| JPH10118664A (en) | Treatment of waste water containing cyan compound and organic matter | |
| JPH0231888A (en) | Treatment of heavy metal waste water containing cyanide | |
| US5137642A (en) | Detoxification of aqueous cyanide solutions | |
| JP4106415B2 (en) | Treatment method of wastewater containing cyanide | |
| US4176060A (en) | Process for soluble cyanide removal from wastewater streams | |
| JP4639309B2 (en) | Treatment method of wastewater containing cyanide | |
| US1100675A (en) | Process of eliminating iron from liquids. | |
| KR20090067970A (en) | Method for treatment of wastewater containing cyanide | |
| JPS60261590A (en) | Treatment of waste water containing chlorinated hydrocarbon | |
| JPS58216778A (en) | Treatment of water containing cyano-complex | |
| Nonomura | Pretreatments for the determination of total cyanide-interferences, effects of reducing agents and additives | |
| RU2038327C1 (en) | Method of detoxification of spent thiourea solutions in the processes of regeneration of ion-exchange resin and cyanide-containing "tail" pulp in gold-extracting plant working by ion-exchange technology | |
| JPS6216153B2 (en) | ||
| JPH1133571A (en) | Wastewater treatment method | |
| JPH03188986A (en) | Method for treating residual liquid | |
| JPH0117432B2 (en) | ||
| JP3171605B2 (en) | Industrial waste liquid treatment method |