JPS6135894A - Removal of arsenic in waste water - Google Patents
Removal of arsenic in waste waterInfo
- Publication number
- JPS6135894A JPS6135894A JP15696384A JP15696384A JPS6135894A JP S6135894 A JPS6135894 A JP S6135894A JP 15696384 A JP15696384 A JP 15696384A JP 15696384 A JP15696384 A JP 15696384A JP S6135894 A JPS6135894 A JP S6135894A
- Authority
- JP
- Japan
- Prior art keywords
- waste water
- arsenic
- ferric sulfate
- sulfate solution
- amount
- 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
Classifications
-
- 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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
- C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/103—Arsenic compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/06—Controlling or monitoring parameters in water treatment pH
Abstract
Description
【発明の詳細な説明】
（イ）技術分野
本発明は含砒素排水の処理方法に関するものであり、更
に詳しくはフェライトの存在下で硫酸第２鉄と反応させ
ることにより砒素を除去する方法に関するものである。Detailed Description of the Invention (a) Technical Field The present invention relates to a method for treating arsenic-containing wastewater, and more specifically to a method for removing arsenic by reacting it with ferric sulfate in the presence of ferrite. It is.
（ロ）背景技術
従来、液中のＡｓを除去する方法としては、第２鉄イオ
ンと反応させ砒酸鉄として沈殿除去する方法（特開昭５
９−１６２８９７号公報）や、磁性粒子を分散させた抽
出溶剤と被処理水とを超音波を、用いて混合し、次いで
磁気分離する方法（特開昭５２−１２０５４７号公報）
、また第１鉄塩の存在化で排水のＰＨをアルカリ性に調
節し、空気等の混入でフェライト化反応を行なわせる方
法（特開昭５４−４１２７０号公報）など種々の方法が
知られている。(b) Background Art Conventionally, as a method for removing As in a liquid, a method of reacting with ferric ions and precipitating it as iron arsenate (Japanese Patent Application Laid-Open No.
9-162897), and a method in which an extraction solvent in which magnetic particles are dispersed and water to be treated are mixed using ultrasonic waves, and then magnetically separated (Japanese Patent Application Laid-open No. 120547/1982).
In addition, various methods are known, such as a method in which the pH of wastewater is adjusted to alkaline by the presence of ferrous salt, and a ferrite reaction is carried out by mixing air etc. (Japanese Patent Application Laid-Open No. 1983-41270). .
しかし、一般に市販の硫酸第２鉄溶液を使用する方法は
試薬代等のコストが高いので、排水中の第１鉄イオンを
酸化剤の添加やバクテリア等で第２鉄に酸化する方法も
提案されているが、単に硫酸第２鉄溶液の添加による処
理方法では当量比で砒素ｌに対し第２鉄が約３０〜５０
倍位の割合で反応させなければならない上、反応時間も
長時間を要していた。However, since the method of using a commercially available ferric sulfate solution is generally expensive due to the cost of reagents, other methods have also been proposed in which ferrous ions in wastewater are oxidized to ferric iron by adding an oxidizing agent or using bacteria. However, in a treatment method simply adding a ferric sulfate solution, the equivalent ratio of ferric iron to arsenic is approximately 30 to 50.
In addition to having to react at twice the rate, the reaction time also took a long time.
（ハ）発明の開示
本発明者等は硫酸第２鉄溶液の消費量を従来の使用量の
１／１０程度に少なくすると共に、短時間で処理できる
方法を鋭意硬究していたところ、フェライト微粒子の存
在下で硫酸第２鉄を添加すると短時間で砒素の沈殿を生
ずることを見い出したのである。(C) Disclosure of the Invention The present inventors have been diligently researching a method that can reduce the consumption of ferric sulfate solution to about 1/10 of the conventional amount and process it in a short time. They discovered that when ferric sulfate is added in the presence of fine particles, arsenic precipitates in a short period of time.
本発明法は砒素含有排水に少量のフェライト微粒子を添
加す誌第１工程と、該工程水に砒素含有量に対して数当
量の硫酸第２鉄溶液を添加して撹拌し砒酸鉄の沈殿を生
成せしめる第２工程とからなるものである。The method of the present invention includes the first step of adding a small amount of ferrite fine particles to arsenic-containing wastewater, and adding a ferric sulfate solution of several equivalents to the arsenic content to the step water and stirring to prevent precipitation of iron arsenate. It consists of a second step of generating the
この第２工程において、硫酸第２鉄の添加量により該工
程液のＰＨは２．０〜６．０、好ましくは３．０〜５．
０の範囲に調整するようにする。In this second step, the pH of the process solution is 2.0 to 6.0, preferably 3.0 to 5.0, depending on the amount of ferric sulfate added.
Adjust to a range of 0.
砒酸鉄の生成には、次式の反応が行なわれ゛る。The following reaction takes place to produce iron arsenate.
Ａｓ０ａ ３ − ＋ Ｆｅ”＋ＦｅＡｓ０４
この反応は通常の砒酸鉄生成の反応式であるが、その反
応速度は極めて速く且つ硫酸第２鉄の添加量もわずかに
数当量である。As0a 3 − + Fe”+FeAs04
This reaction is a general reaction formula for producing iron arsenate, but the reaction rate is extremely fast and the amount of ferric sulfate added is only a few equivalents.
これにより、従来法に比し反応容器の容積を格段に縮小
することができ、同時に硫酸第２鉄の添加量を従来の１
／ｌ Ｏ程度に節減することが可能となる。This makes it possible to significantly reduce the volume of the reaction vessel compared to conventional methods, and at the same time reduce the amount of ferric sulfate added compared to conventional methods.
It is possible to reduce the amount to about 100%.
この原因としては、第１工程において添加した７、ライ
ト微粒子（ＭＯ＊ Ｆｅｐ、ＯＢ、 Ｍ ＝Ｃａ、Ｓｒ
、Ｂａ、Ｌｉ）（７）周辺に液中の平均濃度より高濃度
のＡｓＯ２−８イオンが存在し。The reason for this is that 7, light fine particles (MO* Fep, OB, M = Ca, Sr
, Ba, Li) (7) AsO2-8 ions exist at a higher concentration than the average concentration in the liquid.
Ｆｅ３＋イオンとの砒酸鉄生成反応が効率よく行なわれ
るからであると考えられる。This is believed to be because the iron arsenate production reaction with Fe3+ ions is carried out efficiently.
以下、本発明の詳細を実施例により説明する。Hereinafter, the details of the present invention will be explained with reference to Examples.
（ニ）実施例
実施例１
１．５４ ｍｇ ／文の砒素を含有する原液５Ｑ４Ｑ、
を容量７５文の反応槽に導入し、次いでバリウムフェラ
イト微粒子を５ｇｉ添加した（第１工程）。(d) Examples Example 1 Stock solution 5Q4Q containing 1.54 mg/b of arsenic,
was introduced into a reaction tank having a capacity of 75 tons, and then 5 gi of barium ferrite fine particles were added (first step).
次に、Ｆｅ３＋として４ｇ／又濃度の硫酸＃Ｉ２鉄溶液
４３ｃ’ｃを該反応槽に添加し、約５分間撹拌した後（
第２工程）、５濾過機に導いて固液分離した。Next, 4 g of Fe3+/43 c'c of #I2 iron sulfate solution with a concentration of 43 c'c was added to the reaction tank, and after stirring for about 5 minutes (
(2nd step), the mixture was introduced into a 5-filter for solid-liquid separation.
その結果を、次の実施例２ならびに比較例の結果と併せ
て表に示す。The results are shown in the table together with the results of Example 2 and Comparative Example below.
実施例？
１．３１ ｍｇ／ｌの砒素を含有する原液５０Ｍを容量
７５立の反応槽に導入し、次いでストロンチウムフェラ
イト微粒子７ｇ／４１を添加した（第１工程）。Example? A 50M stock solution containing 1.31 mg/l of arsenic was introduced into a 75-liter reaction tank, and then 7 g/41 of strontium ferrite fine particles were added (first step).
次に、Ｆｅ”＋とじて４ｇ／Ａ濃度の硫酸第２鉄溶液４
１．４ｉｃｅを該反応槽に添加して約６分間撹拌した後
（第２工程）、５濾過機に導き固液分離した。Next, a ferric sulfate solution 4 with a concentration of 4 g/A including Fe"+
After adding 1.4 ice to the reaction tank and stirring for about 6 minutes (second step), the mixture was introduced into a 5-filter for solid-liquid separation.
その結果を表に示す。The results are shown in the table.
比較例
１．４２ ｍｇ ／見の砒素を含有する原液５０２（た
だし、予めアルカリ中和剤として消石灰を用１．ＮてＰ
Ｈを調整しである）を、フェライト微粒子を添加するこ
となく、実施例１．２と同様の方法゛で処理した。Comparative Example: A stock solution containing 1.42 mg/min of arsenic 502 (however, slaked lime was used as an alkali neutralizing agent in advance and 1.N
(H was adjusted) was treated in the same manner as in Example 1.2 without adding ferrite fine particles.
この場合には、同−脱砒率を得るまでに添加した硫酸第
２鉄溶液は当量比で３２倍（添加量５６８ ｃｃ）を必
要とし、処理時間は５２分を要した。In this case, the equivalent amount of ferric sulfate solution added was required to be 32 times (added amount 568 cc) to obtain the same arsenic removal rate, and the treatment time was 52 minutes.
その結果を表に示す。The results are shown in the table.
（以下余白）
（ホ）発明の効果
本発明法は前記表に示される如く、硫酸第２鉄の添加量
（Ｆｅ／Ａｓ重量比）が少なくて済み、かつ反応時間も
短時間で済む利点がある。(Left below) (E) Effects of the Invention As shown in the table above, the method of the present invention has the advantage that the amount of ferric sulfate added (Fe/As weight ratio) is small and the reaction time is short. be.
なお、上記実施例ではＳ濾過機としてフィルタープレス
を用いたが、これはスーパーデカンタ−等であっても差
しつかえないことは勿論である。In the above embodiments, a filter press was used as the S filtration machine, but it goes without saying that a super decanter or the like may also be used.
図は本発明法のフローシートである。
特 許 出 願 人 同和鉱業株式会社砒素殿物
↓戸液The figure is a flow sheet of the method of the present invention. Patent applicant Dowa Mining Co., Ltd. Arsenic deposits
↓Do liquid
Claims (1)
在下において硫酸第２鉄溶液を添加して撹拌することに
より極めて短時間に処理液中の砒素を沈殿分離せしめる
ことを特徴とする排水中の砒素の除去方法。When treating arsenic-containing wastewater, arsenic in the treatment liquid is precipitated and separated in an extremely short period of time by adding a ferric sulfate solution and stirring in the presence of ferrite fine particles. Removal method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15696384A JPS6135894A (en) | 1984-07-27 | 1984-07-27 | Removal of arsenic in waste water |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15696384A JPS6135894A (en) | 1984-07-27 | 1984-07-27 | Removal of arsenic in waste water |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6135894A true JPS6135894A (en) | 1986-02-20 |
| JPH0128633B2 JPH0128633B2 (en) | 1989-06-05 |
Family
ID=15639141
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15696384A Granted JPS6135894A (en) | 1984-07-27 | 1984-07-27 | Removal of arsenic in waste water |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6135894A (en) |
Cited By (9)
| 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 |
| JP2005000823A (en) * | 2003-06-12 | 2005-01-06 | Japan Science & Technology Agency | Method for treating geothermal water |
| WO2006080587A1 (en) * | 2005-01-31 | 2006-08-03 | Egs Company, Limited | Immobilizing agent and immobilization method for harmful component |
| JP2009018291A (en) * | 2007-07-13 | 2009-01-29 | Dowa Metals & Mining Co Ltd | Method for treating arsenic, where seed crystals are added |
| JP2009079237A (en) * | 2007-09-25 | 2009-04-16 | Nikko Kinzoku Kk | Process for producing scorodite, and process for recycling post-scorodite-synthesis solution |
| US20090291307A1 (en) * | 2006-07-27 | 2009-11-26 | Dowa Metals & Mining Co., Ltd | Iron arsenate powder |
| JP2010043359A (en) * | 2009-10-26 | 2010-02-25 | Nippon Mining & Metals Co Ltd | Method for producing scorodite and method for recycling after-synthesis-solution of scorodite |
| CN102642974A (en) * | 2012-05-07 | 2012-08-22 | 昆明理工大学 | Method for treating high-acid high-chlorine waste water |
| JP2015166080A (en) * | 2014-02-14 | 2015-09-24 | Jnc株式会社 | Method for removing harmful substance in aqueous solution |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110980914A (en) * | 2019-12-09 | 2020-04-10 | 昆明理工大学 | Method for removing arsenic by adsorbing high-alkalinity ferric hydroxide gel |
-
1984
- 1984-07-27 JP JP15696384A patent/JPS6135894A/en active Granted
Cited By (9)
| 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 |
| JP2005000823A (en) * | 2003-06-12 | 2005-01-06 | Japan Science & Technology Agency | Method for treating geothermal water |
| WO2006080587A1 (en) * | 2005-01-31 | 2006-08-03 | Egs Company, Limited | Immobilizing agent and immobilization method for harmful component |
| US20090291307A1 (en) * | 2006-07-27 | 2009-11-26 | Dowa Metals & Mining Co., Ltd | Iron arsenate powder |
| JP2009018291A (en) * | 2007-07-13 | 2009-01-29 | Dowa Metals & Mining Co Ltd | Method for treating arsenic, where seed crystals are added |
| JP2009079237A (en) * | 2007-09-25 | 2009-04-16 | Nikko Kinzoku Kk | Process for producing scorodite, and process for recycling post-scorodite-synthesis solution |
| JP2010043359A (en) * | 2009-10-26 | 2010-02-25 | Nippon Mining & Metals Co Ltd | Method for producing scorodite and method for recycling after-synthesis-solution of scorodite |
| CN102642974A (en) * | 2012-05-07 | 2012-08-22 | 昆明理工大学 | Method for treating high-acid high-chlorine waste water |
| JP2015166080A (en) * | 2014-02-14 | 2015-09-24 | Jnc株式会社 | Method for removing harmful substance in aqueous solution |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0128633B2 (en) | 1989-06-05 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| EXPY | Cancellation because of completion of term |