JPS60125292A - Treatment of arsenic-containing waste water - Google Patents
Treatment of arsenic-containing waste waterInfo
- Publication number
- JPS60125292A JPS60125292A JP23402383A JP23402383A JPS60125292A JP S60125292 A JPS60125292 A JP S60125292A JP 23402383 A JP23402383 A JP 23402383A JP 23402383 A JP23402383 A JP 23402383A JP S60125292 A JPS60125292 A JP S60125292A
- Authority
- JP
- Japan
- Prior art keywords
- arsenic
- waste water
- salt
- added
- iii
- 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
Landscapes
- Removal Of Specific Substances (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は、有毒物質である水溶性ひ素（Ａ８）化合物を
含有する廃水を処理して、ひ素またはその化合物を除去
する方法に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for treating wastewater containing water-soluble arsenic (A8) compounds, which are toxic substances, to remove arsenic or its compounds.
水溶性のひ素化合物は極めて毒性が強く、これらを含有
する廃水を放出することについては厳しく規制されてい
る。Water-soluble arsenic compounds are extremely toxic, and the release of wastewater containing them is strictly regulated.
従来は、ひ素含有廃水の処理方法としては、塩基性条件
下でＣａ（ＯＨ）２を添加して、ひ素化合物をｃａ、（
Ａｓｏ４）２． ＣａＨＡｓＯ，等のＣａのひ酸塩とし
て沈澱させる方法が知られているが、この方法では処理
水中のひ素濃度（元素として）をＯ，Ｓｐｐｍ （重量
基準、以下同様）以下にすることはできなかった。また
、ｐＨ値が６〜ｑの範囲に調整した廃水にＦｅＣｔ、・
６ Ｈ２Ｏ、Ｆｅ（ＯＨ）３等のＦｅ（ｉｌｌ）塩を添
加処理する方法も知られておシ、この場合処理水中のひ
素濃度をｌｐｐｍ以下とすることができるがＦｅ（１）
塩を比較的多量に添加する必要があり経済的ではなかっ
た。Conventionally, as a treatment method for arsenic-containing wastewater, Ca(OH)2 was added under basic conditions to convert arsenic compounds to ca, (
Aso4)2. A method is known in which Ca is precipitated as an arsenate such as CaHAsO, but this method cannot reduce the arsenic concentration (as an element) in the treated water to less than O, Sppm (on a weight basis, the same applies hereinafter). Ta. In addition, FeCt, ・
A method of adding Fe(ill) salts such as 6 H2O and Fe(OH)3 is also known. In this case, the arsenic concentration in the treated water can be reduced to 1 ppm or less, but Fe(1)
It was not economical to add a relatively large amount of salt.
本発明者等は、効率よく、かつ、経済的なひ素含有廃水
処理方法を開発することを目的として鋭意研究を重ねた
結果本発明に到達したものである。The present inventors have arrived at the present invention as a result of intensive research aimed at developing an efficient and economical method for treating arsenic-containing wastewater.
本発明の上記の目的は、ひ素含有廃水のｐＨ値を６〜９
に調整した後Ｆｅ（ＩＩＩ）塩を添加して、ひ素を上記
廃水から除去するひ未含有廃水の処理方法において、上
記処理によって生成した汚泥を未処理のひ素含有廃水中
に存在させながら、当該未処理廃水にＦｅ（ＩＩＩ）塩
を添加する方法によって達せられる。The above object of the present invention is to reduce the pH value of arsenic-containing wastewater from 6 to 9.
In a method for treating arsenic-free wastewater in which arsenic is removed from the wastewater by adding Fe(III) salt after adjusting the arsenic to This is achieved by adding Fe(III) salts to untreated wastewater.
なお、本明細書に卦いて、「ひ未含有廃水」とは、ひ酸
争塩、亜ひ酸塩その池水溶性ひ素化合物を含有する廃水
をいう。In this specification, the term "wastewater containing no arsenic" refers to wastewater containing arsenic salts, arsenite, and water-soluble arsenic compounds.
本発明方法に用いられるＦｅ（ＩＩＩ）塩は、水溶性の
塩であって、特にＦｅＯ２３・６Ｈ２０、Ｆｅ（ＯＨ）
３等が好ましい。Ｆｅ（ＩＩＩ）塩の添加量としては、
廃水に対して２００− ／ ０００ ｐｐｍとするのが
好ましい。The Fe(III) salt used in the method of the present invention is a water-soluble salt, in particular FeO23.6H20, Fe(OH)
3rd grade is preferred. The amount of Fe(III) salt added is as follows:
Preferably, it is 200-/000 ppm based on wastewater.
、２００ ｐｐｍ未満では効果が十分でなく、ｌ１００
Ｏｐｐを超えても効果が特に増大しないので不経済であ
る。Ｆｅ（■）塩は予め水に溶解して添加するのが好ま
しい。, less than 200 ppm, the effect is not sufficient, and l100
Even if it exceeds Opp, the effect does not particularly increase, so it is uneconomical. It is preferable that the Fe(■) salt be dissolved in water in advance and added.
ひ未含有廃水は、Ｆｅ（ＩＩＩ）塩により処理するに先
立ってｐＨ値を６〜９の範囲に調整する必要がある。ｐ
Ｈ値が上記範囲外であるとひ素化合物を廃水から除去す
る効率が低下するので好ましくない。The pH value of non-ferrous wastewater needs to be adjusted to a range of 6 to 9 prior to treatment with Fe(III) salts. p
If the H value is outside the above range, the efficiency of removing arsenic compounds from wastewater will decrease, which is not preferable.
ひ未含有廃水をＦｅ（ｎｌ）塩で処理すると、ひ素化合
物は、Ａｓ０４３− 、 ＡｅＯ８３−等の陰イオンを
含有するＦｅ（ｌｉｔ）の錯体とＦｅ（ｏｎ）、等との
共沈物と推定される汚泥を生成するが、この汚泥を未処
理廃水中に存在させながらＦｅ（ｌｉｔ）塩を添加する
。When wastewater containing no carbon is treated with Fe(nl) salt, arsenic compounds are estimated to be coprecipitates of Fe(lit) complexes containing anions such as As043- and AeO83-, Fe(on), etc. The Fe(lit) salt is added while the sludge is present in the untreated wastewater.
存在させる汚泥の量には特に制限がないが、未処理廃水
に対して、少なくとも元素状ＡｓとしてｌＯｐｐｍに相
邑するひ未発を゛含有する量の汚泥を存在させるのが好
ましく、少なくとも／ ３ ｐｐｍに相当する量の汚泥
を存在させるとさらに好ましい。Although there is no particular limit to the amount of sludge present, it is preferable that sludge be present in an amount that contains at least 100 ppm of elemental As, and at least /3 It is further preferred that sludge be present in an amount corresponding to ppm.
なお、未処理廃水中に含まれるひ素化合物の量が多い場
合は、０ａ（ＯＨ）、処理等によって、予めひ素含量を
／−／θｐｐｍ程度に減少させておくとＦｅ（［１）塩
の使用量が少量でよいので経済的である。In addition, if the amount of arsenic compounds contained in untreated wastewater is large, it is recommended to reduce the arsenic content to about /-/θppm in advance by 0a(OH) treatment, etc. before using Fe([1) salt. It is economical because only a small amount is required.
本発明方法によると、Ｆｅ（１１）塩の使用量が従来の
１７３である／ ０００ ｐｐｍ以下であっても、処理
済廃水中のひ素化合物の濃度をＯ，／ｐｐｍ以下（元素
状Ａｓとして’）、０．０ ／ ｐｐｍ程度まで減少さ
せることができる°ので産業上の利用価値は極めて大で
ある。According to the method of the present invention, even if the amount of Fe(11) salt used is less than the conventional 173/000 ppm, the concentration of arsenic compounds in treated wastewater can be reduced to less than O,/ppm (as elemental As'). ), it can be reduced to about 0.0/ppm, so it has extremely great industrial value.
続いて、実施例に基づいて本発明を具体的に説明する。Next, the present invention will be specifically explained based on Examples.
実施例
ひ素含有量が！； ００ ｐｐｍであるひ未含有廃水Ａ
；００ｍ１に、ＦｅＣｌ３・６Ｈ２０を６０θｐｐｍ添
加し、ＮａＯＨによりｐＨをｇ、ｓに調整してひ素化合
物を沈澱させた。沈澱した汚泥を処理容器中に残し、上
澄液を除去した。上記容器にさらに上記と同一の未処理
のひ未含有廃水ｓｏｏｍｐ（ひ素含量５００ ｐｐｍ
）を採取し、ＦｅＣ！Ｌ３弓Ｈ２０をｌ、 ００ ｐｐ
ｍ添加し、ＮａＯＨによりｐＨをｇ、ｓに調整して処理
した。同様の操作を繰り返して、処理回数すなわち汚泥
の量と上澄液のひ素濃度の関係を第１図
・に示した。Example arsenic content! ; 00 ppm non-sulfur-containing wastewater A
00ml was added 60θppm of FeCl3.6H20, and the pH was adjusted to g, s with NaOH to precipitate an arsenic compound. The precipitated sludge was left in the treatment vessel and the supernatant liquid was removed. In the above container, the same untreated waste water soomp (arsenic content 500 ppm) was added.
) was collected and FeC! L3 bow H20 l, 00 pp
m, and the pH was adjusted to g, s with NaOH. Similar operations were repeated, and the relationship between the number of treatments, that is, the amount of sludge, and the arsenic concentration in the supernatant liquid is shown in Figure 1.
第１図はひ未含有廃水の処理回数と上澄液（処理済廃水
）中のひ素濃度との関係を示すグラフである。
特許出願人 三菱モンサンド化成株式会社代 理 人
弁理士長各州
（ほか７名）
手続補正書（自発）
昭和５９年１月２６日
／ 事件の表示 昭和ｓｉｒ年特許願第２．３’１０２
３号方
コ 発明の名称 ひ素含有廃水の処理・法３ 補正をす
る者
事件との関係 特許出願人
名称＜ｔ−ｏ’ｉ＞三菱モンサントイヒ成株式会社ｑ代
理人〒１００
Ｓ 補正の対象 明細書の特許請求の範囲及び発明の詳
細な説明の欄
ム補正の内容
（２）明細書箱コ頁第１０行目を次の通シ訂正する。
［整した廃水にＦｅＣｔ、−４Ｈ２０，Ｆｅ（Ｎｏ、）
３ 。
Ｆｅ（ＱＣＣＨ３）３等のＦｅ（ｍ ） ＪＩ
（３） 明細書第３頁第１θ〜／１行目を次の通シ訂正
する。
［本発明の上記の目的は、ひ素含有廃水にＦｅＣＩ ）
塩を添加し、続いてｐＨ値を６〜９に調整して、ひ」
（４）明細書第３頁第１θ〜／１行目を次の通シ訂正す
る。
「６塩ｒ：あって、特にＰｅＣＬｓ −４Ｈ２０、Ｆｅ
（Ｎｏ３）３゜水和物、Ｆｅ・ＳＯ，・水和物等でもよ
い。Ｆｅ（Ｉｎ）塩の添加量としては、廃水に」
（５）明細書第弘頁第１行目を次の通９訂正する。
「ない。なお、ｐＨ値の調整には、ＮａＯＨ，ＫＯＨ等
の強塩基性水酸化物の水溶液を用いるのが好ましい。」
以 上
別紙
特許請求の範囲
除去するひ素含有廃水の処理方法において、上記処理に
よって生成した汚泥を未処理のひ素含有廃水中に存在さ
せながら、当該未処理廃水にＦｅ（ａｔ） 塩を添加す
ることを特徴とする方法。
（２） Ｆｅ（ｍ） 塩の添加量が２００〜／ ０００
ｐｐｍ（重量基準）である特許請求の範囲第１項記載
の方法。FIG. 1 is a graph showing the relationship between the number of times of treatment of wastewater containing no arsenic and the arsenic concentration in the supernatant liquid (treated wastewater). Patent applicant Mitsubishi Monsando Kasei Co., Ltd. Agent
Chief Patent Attorneys for each state (and 7 others) Procedural amendment (voluntary) January 26, 1980 / Display of case Showa sir year patent application No. 2.3'102
Item 3 Title of the invention Treatment of arsenic-containing wastewater/Act 3 Relationship with the case of the person making the amendment Patent applicant name <t-o'i> Mitsubishi Monsanto Ichige Co., Ltd. q Agent 〒100 S Subject of amendment Details Contents of amendments to the Claims and Detailed Description of the Invention (2) Line 10 of page 1 of the specification box shall be corrected as follows. [FeCt, -4H20, Fe (No,) in the conditioned wastewater
3. Fe(m) JI (3) such as Fe(QCCH3)3 etc. The following correction is made to page 3, lines 1θ to /1 of the specification. [The above object of the present invention is to add FeCI to arsenic-containing wastewater]
Add salt, then adjust the pH value to 6-9, and make the following corrections to page 3, line 1θ~/1 of the specification. 6 salts: Yes, especially PeCLs-4H20, Fe
(No. 3) 3° hydrate, Fe.SO,.hydrate, etc. may be used. The amount of Fe(In) salt to be added to the wastewater is as follows: "No. For adjusting the pH value, it is preferable to use an aqueous solution of a strong basic hydroxide such as NaOH or KOH." A method characterized by adding Fe(at) salt to untreated arsenic-containing wastewater while allowing sludge produced by the treatment to exist in the untreated arsenic-containing wastewater. (2) Fe(m) Addition amount of salt is 200~/000
The method according to claim 1, wherein the amount is ppm (by weight).
Claims (2)
ｅ（１）塩を添加して、ひ素を上記廃水から除去するひ
素含有廃水の処理方法において、上記処理によって生成
した汚泥を未処理のひ素含有廃水中に存在させながら、
当該未処理廃水にＦｅ（Ｉｌｌ）塩を添加することを特
徴とする方法。(1) After adjusting the pH value of arsenic-containing wastewater to 6-9
e(1) In a method for treating arsenic-containing wastewater in which arsenic is removed from the wastewater by adding salt, while allowing the sludge produced by the above-mentioned treatment to exist in the untreated arsenic-containing wastewater,
A method characterized in that Fe(Ill) salt is added to the untreated wastewater.
ｐｐｍ（重量基準）である特許請求の範囲第７項記載の
方法。(2) The amount of Fe(111) salt added is 200 to 7000
8. The method according to claim 7, wherein the amount is ppm (by weight).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23402383A JPS60125292A (en) | 1983-12-12 | 1983-12-12 | Treatment of arsenic-containing waste water |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23402383A JPS60125292A (en) | 1983-12-12 | 1983-12-12 | Treatment of arsenic-containing waste water |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60125292A true JPS60125292A (en) | 1985-07-04 |
| JPH0318519B2 JPH0318519B2 (en) | 1991-03-12 |
Family
ID=16964345
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23402383A Granted JPS60125292A (en) | 1983-12-12 | 1983-12-12 | Treatment of arsenic-containing waste water |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60125292A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5840194A (en) * | 1996-01-16 | 1998-11-24 | Mitsubishi Jukogyo Kabushiki Kaisha | Process for treating arsenic-containing waste water |
| JP2002172395A (en) * | 2000-12-05 | 2002-06-18 | Nec Environment Eng Ltd | Method for iron hydroxide flocculation and sedimentation treatment of thick inorganic component- containing wastewater |
| JP2007021350A (en) * | 2005-07-15 | 2007-02-01 | Seiichi Manabe | Removal method of toxic substance in exuded water from least controlled landfill site |
| CN102602994A (en) * | 2011-12-20 | 2012-07-25 | 湖南展泰有色金属有限公司 | Method for preparing arsenic trioxide by utilizing arsenious waste water |
-
1983
- 1983-12-12 JP JP23402383A patent/JPS60125292A/en active Granted
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5840194A (en) * | 1996-01-16 | 1998-11-24 | Mitsubishi Jukogyo Kabushiki Kaisha | Process for treating arsenic-containing waste water |
| JP2002172395A (en) * | 2000-12-05 | 2002-06-18 | Nec Environment Eng Ltd | Method for iron hydroxide flocculation and sedimentation treatment of thick inorganic component- containing wastewater |
| JP2007021350A (en) * | 2005-07-15 | 2007-02-01 | Seiichi Manabe | Removal method of toxic substance in exuded water from least controlled landfill site |
| CN102602994A (en) * | 2011-12-20 | 2012-07-25 | 湖南展泰有色金属有限公司 | Method for preparing arsenic trioxide by utilizing arsenious waste water |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0318519B2 (en) | 1991-03-12 |
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