JPH0318519B2 - - Google Patents
Info
- Publication number
- JPH0318519B2 JPH0318519B2 JP23402383A JP23402383A JPH0318519B2 JP H0318519 B2 JPH0318519 B2 JP H0318519B2 JP 23402383 A JP23402383 A JP 23402383A JP 23402383 A JP23402383 A JP 23402383A JP H0318519 B2 JPH0318519 B2 JP H0318519B2
- Authority
- JP
- Japan
- Prior art keywords
- arsenic
- wastewater
- ppm
- salt
- containing wastewater
- 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
Landscapes
- Removal Of Specific Substances (AREA)
Description
本発明は、有毒物質である水溶性ひ素（As）
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。
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。
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Ca3（AsO4）2、CaHAsO4等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0.5ppm（重量
基準、以下同様）以下にすることはできなかつ
た。また、PH値が６〜９の範囲に調整した廃水に
FeCl3・6H2O、Fe（NO3）3、
The present invention deals with water-soluble arsenic (As), which is a toxic substance.
The present invention relates to a method for treating wastewater containing compounds to remove arsenic or its compounds. Water-soluble arsenic compounds are extremely toxic, and the release of wastewater containing them is strictly regulated. Conventionally, the method for treating arsenic-containing wastewater is to add Ca(OH) 2 under basic conditions to precipitate arsenic compounds as arsenates such as Ca 3 (AsO 4 ) 2 and CaHAsO 4 . Although this method is known, it has not been possible to reduce the arsenic concentration (as an element) in treated water to 0.5 ppm (by weight, the same applies hereinafter) or less. In addition, wastewater whose pH value has been adjusted to a range of 6 to 9.
FeCl3・6H2O , Fe( NO3 ) 3 ,
【式】等
のFe（）塩を添加処理する方法も知られてお
り、この場合処理水中のひ素濃度を1ppm以下と
することができるがFe（）塩を比較的多量に添
加する必要があり経済的ではなかつた。
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着したものであ
る。
本発明の上記の目的は、ひ素含有廃水にFe
（）を添加し、続いてPH値を６〜９に調整して、
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、上記処理によつて生成した汚泥を
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（）塩を添加する方法によつて
達せられる。
なお、本明細書において、「ひ素含有廃水」と
はひ酸塩、亜ひ酸塩その他水溶性ひ素化合物を含
有する排水をいう。
本発明方法に用いられるFe（）塩は、水溶性
の塩であつて、特にFeCl3・6H2O、Fe（NO3）3、
A method of adding Fe() salt such as [Formula] is also known, and in this case, the arsenic concentration in the treated water can be reduced to 1 ppm or less, but it is necessary to add a relatively large amount of Fe() salt. It wasn't economical. 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. The above object of the present invention is to add Fe to arsenic-containing wastewater.
(), then adjust the pH value to 6-9,
A method for treating arsenic-containing wastewater that removes arsenic from the above-mentioned wastewater includes adding Fe() salt to the untreated wastewater while allowing the sludge produced by the above-mentioned treatment to exist in the untreated arsenic-containing wastewater. It can be achieved by leaning. In this specification, "arsenic-containing wastewater" refers to wastewater containing arsenate, arsenite, and other water-soluble arsenic compounds. The Fe() salt used in the method of the present invention is a water-soluble salt, particularly FeCl 3 6H 2 O, Fe(NO 3 ) 3 ,
【式】、Fe2（SO3）3等が好ましい。ま
た、Fe（）塩であつても水溶液中で酸化されて
Fe（）塩に変化するもの、例えばFeCl2または
その水和物、FeSO4水和物等でもよい。Fe（）
塩の添加量としては、廃水に対して200〜
1000ppmとするのが好ましい。200ppm未満では
効果が十分ではなく、1000ppm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
予め溶解して添加するのが好ましい。
ひ素含有廃水は、Fe（）塩により処理するに
先立つてPH値を６〜９の範囲で調整する必要があ
る。PH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。
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。
ひ素含有廃水をFe（）塩で処理すると、ひ素
化合物は、AsO4 3-、AsO3 3-等の陰イオンを含有
するFe（）の錯体とFe（OH）3等と共沈物と推定
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（）塩を添加する。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10ppm
に相当するひ素分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15ppmに相当する量
の汚泥を存在させるとさらに好ましい。
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、Ca（OH）2処理等によつて、予め
ひ素含量を１〜10ppm程度に減少させておくと
Fe（）塩の使用量が少量でよいので経済的であ
る。
本発明方法によると、Fe（）塩の使用量が従
来の1/3である1000ppm以下であつても、処理済
廃水中のひ素化合物の濃度を0.1ppm以下（元素
状Asとして）、0.01ppm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。
続いて、実施例に基づいて本発明を具体的に説
明する。
実施例
ひ素含有量が500ppmであるひ素含有廃水500ml
に、FeCl3・6H2Oを600ppm添加し、NaOHによ
りPHを8.5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
素含有廃水500ppm（ひ素含有500ppm）を採取し、
FeCl3・6H2Oを600ppm添加し、NaOHによりPH
を8.5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。[Formula], Fe 2 (SO 3 ) 3 , etc. are preferred. In addition, even Fe() salts are oxidized in aqueous solution.
It may also be a substance that converts into Fe() salt, such as FeCl 2 or its hydrate, FeSO 4 hydrate, etc. Fe()
The amount of salt added to wastewater is 200~
It is preferable to set it to 1000 ppm. If it is less than 200 ppm, the effect is not sufficient, and if it exceeds 1000 ppm, the effect does not particularly increase, which is uneconomical. It is preferable that the Fe() salt be dissolved in advance and added. Prior to treating arsenic-containing wastewater with Fe() salts, it is necessary to adjust the pH value within the range of 6 to 9. If the PH value is outside the above range, the efficiency of removing arsenic compounds from wastewater will decrease, which is not preferable.
Note that for adjusting the PH value, it is preferable to use an aqueous solution of a strong basic hydroxide such as NaOH or KOH. When arsenic-containing wastewater is treated with Fe() salts, arsenic compounds are presumed to be coprecipitated with Fe() complexes containing anions such as AsO 4 3- and AsO 3 3- and Fe(OH) 3 , etc. Fe() salts are added while this sludge is present in untreated wastewater. There is no particular limit to the amount of sludge present, but it should be at least 10 ppm as elemental As in untreated wastewater.
Preferably, the sludge is present in an amount containing an arsenic content of at least 15 ppm, more preferably at least 15 ppm. In addition, if the amount of arsenic compounds contained in untreated wastewater is large, it is recommended to reduce the arsenic content to about 1 to 10 ppm in advance through Ca(OH) 2 treatment, etc.
It is economical because only a small amount of Fe() salt is needed. According to the method of the present invention, even if the amount of Fe() salt used is 1000 ppm or less, which is one third of the conventional amount, the concentration of arsenic compounds in treated wastewater can be reduced to 0.1 ppm or less (as elemental As) or 0.01 ppm. Since it can be reduced to a certain degree, it has extremely great industrial utility value. Next, the present invention will be specifically explained based on Examples. Example 500ml of arsenic-containing wastewater with an arsenic content of 500ppm
Then, 600 ppm of FeCl 3 .6H 2 O was added, and the pH was adjusted to 8.5 with NaOH to precipitate arsenic compounds.
The precipitated sludge was left in the treatment vessel and the supernatant liquid was removed. Collect 500 ppm of the same untreated arsenic-containing wastewater (arsenic content: 500 ppm) into the above container,
Add 600ppm of FeCl 3 6H 2 O and PH with NaOH
Processed by adjusting to 8.5. Similar operations were repeated, and the relationship between the number of treatments, that is, the amount of sludge, and the arsenic concentration of the supernatant liquid is shown in Figure 1.
第１図はひ素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。
FIG. 1 is a graph showing the relationship between the number of times arsenic-containing wastewater is treated and the arsenic concentration in the supernatant liquid (treated wastewater).
Claims (1)
PH値を６〜９に調整して、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
理によつ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（）
塩を添加することを特徴とする方法。 ２ Fe（）塩の添加量が200〜1000ppm（重量基
準）である特許請求の範囲第１項記載の方法。[Claims] 1. Adding Fe() salt to arsenic-containing wastewater, and then
In a method for treating arsenic-containing wastewater in which arsenic is removed from the wastewater by adjusting the pH value to 6 to 9, the sludge produced by the above treatment is present in the untreated arsenic-containing wastewater, and the untreated arsenic-containing wastewater is Fe() in wastewater
A method characterized by the addition of salt. 2. The method according to claim 1, wherein the amount of Fe() salt added is 200 to 1000 ppm (by weight).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23402383A JPS60125292A (en) | 1983-12-12 | 1983-12-12 | Treatment method for arsenic-containing wastewater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23402383A JPS60125292A (en) | 1983-12-12 | 1983-12-12 | Treatment method for arsenic-containing wastewater |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60125292A JPS60125292A (en) | 1985-07-04 |
| JPH0318519B2 true 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 method for arsenic-containing wastewater |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60125292A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09192677A (en) * | 1996-01-16 | 1997-07-29 | Mitsubishi Heavy Ind Ltd | Treatment of arsenic-containing waste water |
| JP4591641B2 (en) * | 2000-12-05 | 2010-12-01 | Ｎｅｃファシリティーズ株式会社 | Method for coagulating and precipitating iron hydroxide in wastewater containing concentrated inorganic components |
| JP5136735B2 (en) * | 2005-07-15 | 2013-02-06 | 征一 真鍋 | Method for removing toxic substances in exudate from final disposal site for stable industrial waste |
| CN102602994B (en) * | 2011-12-20 | 2013-08-21 | 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
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60125292A (en) | 1985-07-04 |
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