JP3341835B2 - Treatment method for selenium-containing water - Google Patents
Treatment method for selenium-containing waterInfo
- Publication number
- JP3341835B2 JP3341835B2 JP2000097095A JP2000097095A JP3341835B2 JP 3341835 B2 JP3341835 B2 JP 3341835B2 JP 2000097095 A JP2000097095 A JP 2000097095A JP 2000097095 A JP2000097095 A JP 2000097095A JP 3341835 B2 JP3341835 B2 JP 3341835B2
- Authority
- JP
- Japan
- Prior art keywords
- selenium
- containing water
- aluminum
- iron
- added
- 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 - Lifetime
Links
Landscapes
- Separation Of Suspended Particles By Flocculating Agents (AREA)
- Removal Of Specific Substances (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、セレン含有水の処
理方法に関する。特に、本発明は、非鉄金属の精錬や石
炭を使った発電の際に排出される排水中に含まれるセレ
ンを除去する、セレン含有水の処理方法に関する。[0001] The present invention relates to a method for treating selenium-containing water. In particular, the present invention relates to a method for treating selenium-containing water, which removes selenium contained in wastewater discharged during refining of non-ferrous metals or power generation using coal.
【０００２】[0002]
【従来の技術】従来、非鉄精錬所や工場などから排出さ
れるセレンを含有する排水を処理する最も簡便な方法と
しては、共沈処理法が採用されていた。しかしながら、
従来の方法では、排水中のセレンをある程度除去するこ
とはできるものの、その程度は十分なものではなかっ
た。その理由は、溶解性セレンには亜セレン酸［ＳｅＯ
3 2-（IV）］とセレン酸［ＳｅＯ4 2-（VI）］とがあり、
亜セレン酸には水酸化鉄（III）による共沈処理が有効
であるものの、セレン酸に対する効率が低く、１０％以
下の除去率にとどまるためである。また、共沈剤として
代表的なものにアルミニウム塩があるが、アルミニウム
塩を使用しても、セレン酸を有効に除去することは期待
できない。したがって、セレンを除去するためには、セ
レン酸を還元して一旦亜セレン酸とした後に、共沈処理
を行なう必要があった。 一方、セレン酸を還元する方法として、例えば、特開平
１０−９９８７４号公報は、６価セレンを塩化第１鉄で
還元する技術を開示している。しかしながら、この方法
は、多量の薬剤を使用する必要があり、また高温で長時
間反応を行なわなければならない点で、問題があった。 このように、セレン酸を効果的に還元する方法がないこ
とから、セレンを有効に除去することは、極めて困難で
あるのが現状であった。 近年では、工業排水などによる環境汚染の問題の解決が
重要視されていることから、セレンなどの有害物質の有
効な除去方法に対する要求も高い。2. Description of the Related Art Conventionally, a coprecipitation method has been employed as the simplest method for treating wastewater containing selenium discharged from a nonferrous smelter or a factory. However,
In the conventional method, selenium in the wastewater can be removed to some extent, but the degree is not sufficient. The reason is that soluble selenium has selenous acid [SeO
3 2- (IV)] and selenic acid [SeO 4 2- (VI)],
Although coprecipitation treatment with iron (III) hydroxide is effective for selenous acid, the efficiency for selenic acid is low and the removal rate is 10% or less. In addition, aluminum salt is a typical coprecipitant, but even if an aluminum salt is used, it cannot be expected that selenic acid will be effectively removed. Therefore, in order to remove selenium, coprecipitation treatment had to be performed after reducing selenic acid to once make selenous acid. On the other hand, as a method for reducing selenic acid, for example, JP-A-10-99874 discloses a technique for reducing hexavalent selenium with ferrous chloride. However, this method has a problem in that a large amount of drug must be used, and the reaction must be performed at a high temperature for a long time. As described above, since there is no method for effectively reducing selenic acid, it has been extremely difficult at present to effectively remove selenium. In recent years, the importance of solving the problem of environmental pollution due to industrial wastewater and the like has been emphasized, and there is a high demand for an effective method for removing harmful substances such as selenium.
【０００３】[0003]
【発明が解決しようとする課題】したがって、本発明
は、セレンを効率よく除去することの可能なセレン含有
水の処理方法を提供することを目的とする。SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a method for treating selenium-containing water that can efficiently remove selenium.
【０００４】[0004]
【課題を解決するための手段】本発明者らは、上記課題
を解決すべく鋭意研究した結果、処理対象であるセレン
含有水に特定の量のアルミニウム及び鉄（III）を存在
させることにより、セレン含有水からセレンを有効に除
去できることを見出した。すなわち、本発明は、セレン
含有水に、セレン含有水に、還元処理を行うことなくセ
レン１モルに対して５モル以上のアルミニウム及び５モ
ル以上の鉄（III）を存在させる工程、アルミニウム及
び鉄（III）が存在するセレン含有水のｐＨを、４〜９
の範囲内に調整する工程、ｐＨを調整したセレン含有水
を攪拌する工程、及び、生成した沈殿物を除去する工程
を含む、セレン含有水の処理方法を提供する。Means for Solving the Problems The present inventors have conducted intensive studies to solve the above-mentioned problems, and as a result, by allowing aluminum and iron (III) to be present in specific amounts in the selenium-containing water to be treated, It has been found that selenium can be effectively removed from selenium-containing water. That is, the present invention provides a step of allowing 5 mol or more of aluminum and 5 mol or more of iron (III) to exist in 1 mol of selenium in water containing selenium without performing a reduction treatment. The pH of the selenium-containing water in which (III) is present is 4 to 9
And a step of stirring the selenium-containing water whose pH has been adjusted, and a step of removing generated precipitates.
【０００５】[0005]
【発明の実施の形態】本発明のセレン含有水の処理方法
は、処理対象であるセレン含有水に、セレン１モルに対
して５モル以上、好ましくは１０モル〜１００００モル
のアルミニウム、及び、セレン１モルに対して５モル以
上、好ましくは１０モル〜１００００モルの鉄を存在さ
せる工程を有する。セレン含有水にアルミニウムを存在
させるには、例えば、アルミニウム化合物をセレン含有
水に添加すればよい。本発明に使用可能なアルミニウム
化合物としては、塩化アルミニウム、ポリ塩化アルミニ
ウム、アルミン酸ナトリウム、アルミン酸カリウム、硫
酸アルミニウム、水酸化アルミニウムなどが挙げられ
る。これらの化合物のうち、塩化アルミニウムが特に好
ましい。これらのアルミニウム化合物を、粉末の状態で
セレン含有水に添加し、攪拌して溶解させてもよく、あ
るいは、水溶液などの溶液の状態で添加してもよい。ア
ルミニウム化合物としては、水溶性のものを使用するの
が望ましい。また、金属アルミニウムを添加することに
より、セレン含有水にアルミニウムを存在させることも
可能である。この場合、金属アルミニウムの粉末を使用
するのが好適であり、粉末の粒径は５μｍ〜１０００μ
ｍ程度とするのがよい。さらに、塩酸、水酸化ナトリウ
ムなどを使用して、予めセレン含有水のｐＨを１〜２の
範囲内に調整した後に、金属アルミニウムを添加するの
が望ましい。金属アルミニウムをセレン含有水に添加し
た後、通常の攪拌方法により、３０分程度攪拌するのが
よい。セレン含有水に鉄を存在させるには、例えば、鉄
化合物をセレン含有水に添加すればよい。本発明に使用
可能な鉄化合物としては、塩化第２鉄、硝酸第２鉄、硫
酸第２鉄などが挙げられる。これらの化合物のうち、塩
化第２鉄が好ましい。これらの鉄化合物を、粉末の状態
でセレン含有水に添加し、攪拌して溶解させてもよく、
あるいは、水溶液などの溶液の状態で添加してもよい。
鉄化合物としては、水溶性のものを使用するのが望まし
い。セレン含有水中に存在するアルミニウムと鉄の比率
は、モル比で１：９〜９：１の範囲内であるのが好まし
い。BEST MODE FOR CARRYING OUT THE INVENTION The method for treating selenium-containing water according to the present invention comprises adding 5 mol or more, preferably 10 mol to 10000 mol of aluminum and selenium to 1 mol of selenium in water to be treated. A step of allowing 5 mol or more, preferably 10 mol to 10000 mol of iron to be present per 1 mol. In order for aluminum to be present in the selenium-containing water, for example, an aluminum compound may be added to the selenium-containing water. Examples of the aluminum compound that can be used in the present invention include aluminum chloride, polyaluminum chloride, sodium aluminate, potassium aluminate, aluminum sulfate, and aluminum hydroxide. Of these compounds, aluminum chloride is particularly preferred. These aluminum compounds may be added to the selenium-containing water in the form of powder and dissolved by stirring, or may be added in the form of a solution such as an aqueous solution. It is desirable to use a water-soluble aluminum compound. Further, by adding metallic aluminum, aluminum can be present in the selenium-containing water. In this case, it is preferable to use metal aluminum powder, and the particle size of the powder is 5 μm to 1000 μm.
m. Further, it is desirable to add metal aluminum after previously adjusting the pH of the selenium-containing water to a range of 1 to 2 using hydrochloric acid, sodium hydroxide, or the like. After adding the metal aluminum to the selenium-containing water, it is preferable to stir for about 30 minutes by a normal stirring method. In order for iron to be present in the selenium-containing water, for example, an iron compound may be added to the selenium-containing water. Examples of the iron compound that can be used in the present invention include ferric chloride, ferric nitrate, and ferric sulfate. Of these compounds, ferric chloride is preferred. These iron compounds may be added to selenium-containing water in the form of a powder and dissolved by stirring.
Alternatively, it may be added in the form of a solution such as an aqueous solution.
It is desirable to use a water-soluble iron compound. The molar ratio of aluminum to iron present in the selenium-containing water is preferably in the range of 1: 9 to 9: 1.
【０００６】本発明のセレン含有水の処理方法は、次い
で、アルミニウム及び鉄が存在するセレン含有水のｐＨ
を、４〜９の範囲内、好ましくは５〜８の範囲内に調整
する工程を有する。 ｐＨの調整は、任意の公知の方法にしたがって行なうこ
とができる。具体的には、アルミニウム及び鉄が存在す
るセレン含有水に、塩酸、水酸化ナトリウム、水酸化カ
ルシウムなどを添加することにより、上記の範囲内の所
望の値にｐＨを調整する。The method for treating selenium-containing water according to the present invention comprises the steps of:
Is adjusted in the range of 4 to 9, preferably in the range of 5 to 8. Adjustment of the pH can be performed according to any known method. Specifically, hydrochloric acid, sodium hydroxide, calcium hydroxide, or the like is added to selenium-containing water in which aluminum and iron are present to adjust the pH to a desired value within the above range.
【０００７】また、本発明のセレン含有水の処理方法
は、ｐＨを調整したセレン含有水を攪拌する工程を有す
る。攪拌は、プロペラ型攪拌機による攪拌などの、従来
公知の攪拌方法により行なうことができる。攪拌速度
は、適宜決定してよいが、１００〜１０００ｒｐｍ程度
とするのが望ましい。攪拌は、少なくとも２分以上行な
うのが望ましく、好ましくは３分〜３０分行なう。The method for treating selenium-containing water of the present invention has a step of stirring the selenium-containing water whose pH has been adjusted. The stirring can be performed by a conventionally known stirring method such as stirring by a propeller-type stirrer. The stirring speed may be appropriately determined, but is desirably about 100 to 1000 rpm. The stirring is desirably performed for at least 2 minutes, preferably for 3 to 30 minutes.
【０００８】なお、本発明のセレン含有水の処理方法
は、さらに、凝集剤を添加する工程を有していてもよ
い。 本発明で使用可能な凝集剤としては、硫酸バン土やＰＡ
Ｃ、塩化鉄（III）などの無機系凝集剤、アクリルアミ
ド系凝集剤などの合成高分子凝集剤、あるいはキトサン
などの天然高分子凝集剤等が挙げられる。[0008] The method for treating selenium-containing water of the present invention may further include a step of adding a flocculant. The coagulant usable in the present invention includes bansulfate and PA.
C, inorganic coagulants such as iron (III) chloride, synthetic polymer coagulants such as acrylamide coagulants, and natural polymer coagulants such as chitosan.
【０００９】さらに、本発明のセレン含有水の処理方法
は、生成した沈殿物を除去する工程を有する。 沈殿物の除去は、濾過、デカンテーション、遠心分離な
どの手段によって行なうことができる。Further, the method for treating selenium-containing water of the present invention has a step of removing generated precipitates. The removal of the precipitate can be performed by means such as filtration, decantation, and centrifugation.
【００１０】以下の実施例により、本発明についてさら
に詳細に説明するが、本発明はこれらの実施例によって
何ら限定されるものではない。[0010] The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to these examples.
【００１１】[0011]
【実施例】実施例１ セレン酸カリウムを水に溶解して、セレン（VI）を２０
ｐｐｍ（０．２５３ｍＭ）含有するモデル排水を調製し
た。これに、アルミニウムと鉄の合計が５ｍＭとなり、
アルミニウムと鉄のモル比が、それぞれ１：３、１：
１、３：１となるように、塩化アルミニウム水溶液（３
０％）及び塩化鉄（III）水溶液（３７．８％）を添加
した。なお、この時のｐＨは、それぞれ２．０、２．
２、２．５であった。次に、それぞれの水溶液に水酸化
ナトリウム水溶液を添加して、ｐＨを６に調整した。ｐ
Ｈを調整した各水溶液を１０分間攪拌し、アニオン性高
分子凝集剤を添加して、生成した沈殿物を濾過により除
去した。沈殿物を除去した各水溶液の上澄液のセレン含
有量を、ＩＣＰ発光分光装置（ＳＰＳ３０００）で測定
したところ、それぞれ９．７ｐｐｍ、３．６ｐｐｍ、
１．５ｐｐｍであった。 EXAMPLE 1 Potassium selenate was dissolved in water and selenium (VI) was added to 20
A model wastewater containing ppm (0.253 mM) was prepared. In addition, the total of aluminum and iron is 5 mM,
The molar ratios of aluminum and iron are 1: 3 and 1:
Aqueous solution of aluminum chloride (3
0%) and an aqueous solution of iron (III) chloride (37.8%). The pH at this time was 2.0, 2.
2, 2.5. Next, an aqueous sodium hydroxide solution was added to each aqueous solution to adjust the pH to 6. p
Each aqueous solution in which H was adjusted was stirred for 10 minutes, an anionic polymer flocculant was added, and the generated precipitate was removed by filtration. The selenium content of the supernatant of each aqueous solution from which the precipitate was removed was measured with an ICP emission spectrometer (SPS3000).
It was 1.5 ppm.
【００１２】実施例２ 実施例１で調製したモデル排水に、アルミニウムと鉄の
合計が１０ｍＭとなり、アルミニウムと鉄のモル比が、
それぞれ１：３、１：１、３：１となるように、塩化ア
ルミニウム水溶液（３０％）及び塩化鉄（III）水溶液
（３７．８％）を添加した。なお、この時のｐＨは、そ
れぞれ２．０、２．１、２．３であった。次に、それぞ
れの水溶液に水酸化ナトリウム水溶液を添加して、ｐＨ
を６に調整した。ｐＨを調整した各水溶液を１０分間攪
拌し、アニオン性高分子凝集剤を添加して、生成した沈
殿物を濾過により除去した。沈殿物を除去した各水溶液
の上澄液のセレン含有量を、実施例１の場合と同様に測
定したところ、それぞれ３．０ｐｐｍ、１．８ｐｐｍ、
０．６ｐｐｍであった。 Example 2 In the model wastewater prepared in Example 1, the total of aluminum and iron was 10 mM, and the molar ratio of aluminum to iron was
An aqueous solution of aluminum chloride (30%) and an aqueous solution of iron (III) chloride (37.8%) were added so as to be 1: 3, 1: 1, and 3: 1 respectively. The pH at this time was 2.0, 2.1, and 2.3, respectively. Next, an aqueous sodium hydroxide solution was added to each aqueous solution to adjust the pH.
Was adjusted to 6. Each aqueous solution whose pH was adjusted was stirred for 10 minutes, an anionic polymer flocculant was added, and the formed precipitate was removed by filtration. When the selenium content of the supernatant of each aqueous solution from which the precipitate was removed was measured in the same manner as in Example 1, the selenium content was 3.0 ppm, 1.8 ppm, respectively.
It was 0.6 ppm.
【００１３】実施例３ 実施例１で調製したモデル排水に、アルミニウムと鉄の
合計が１５ｍＭとなり、アルミニウムと鉄のモル比が、
それぞれ１：３、１：１、３：１となるように、塩化ア
ルミニウム水溶液（３０％）及び塩化鉄（III）水溶液
（３７．８％）を添加した。なお、この時のｐＨは、そ
れぞれ１．８、１．９、２．２であった。次に、それぞ
れの水溶液に水酸化ナトリウム水溶液を添加して、ｐＨ
を６に調整した。ｐＨを調整した各水溶液を１０分間攪
拌し、アニオン性高分子凝集剤を添加して、生成した沈
殿物を濾過により除去した。沈殿物を除去した各水溶液
の上澄液のセレン含有量を、実施例１の場合と同様に測
定したところ、それぞれ０．６ｐｐｍ、０．３ｐｐｍ、
０．４ｐｐｍであった。 Example 3 In the model wastewater prepared in Example 1, the total of aluminum and iron was 15 mM, and the molar ratio of aluminum to iron was
An aqueous solution of aluminum chloride (30%) and an aqueous solution of iron (III) chloride (37.8%) were added so as to be 1: 3, 1: 1, and 3: 1 respectively. The pH at this time was 1.8, 1.9, and 2.2, respectively. Next, an aqueous sodium hydroxide solution was added to each aqueous solution to adjust the pH.
Was adjusted to 6. Each aqueous solution whose pH was adjusted was stirred for 10 minutes, an anionic polymer flocculant was added, and the formed precipitate was removed by filtration. When the selenium content of the supernatant of each aqueous solution from which the precipitate was removed was measured in the same manner as in Example 1, 0.6 ppm, 0.3 ppm,
0.4 ppm.
【００１４】[0014]
【００１５】[0015]
【００１６】実施例４ 精錬所排水として、一次中和シックナーオーバーフロ
ー：副産系原水：三次中和シックナーＵＦリターンを
２：２：１の割合で混合した混合排水について、上記実
施例と同様にセレンの含有量を測定し、併せてヒ素の含
有量を測定したところ、２１．７ｐｐｍのセレン及び８
０３ｐｐｍのヒ素が検出された。この混合排水を、次の
手順にしたがって処理した。まず、ヒ素の除去を目的と
する一次処理として、１リットルの混合排水に塩化鉄
（III）（３７．８％水溶液）を１７．６ミリリットル
添加し、１分間攪拌した後、水酸化ナトリウムを使用し
て、ｐＨを１２に調整し、スラッジを抜き取った。次
に、セレンの除去を目的とする二次処理として、はじめ
に、一次処理を施した混合排水に、混合排水１リットル
あたり１ミリリットルの塩酸（１２Ｎ）を添加して、１
分間攪拌した。なお、この時のｐＨ値は約２．０であっ
た。次に、混合排水１リットルあたり４０００ｍｇ（セ
レン１モルに対して５３９モルのアルミニウム）の量で
金属アルミニウム粉末を添加し、３０分間攪拌した。次
いで、鉄化合物として、塩化鉄（III）（３７．８％水
溶液）を、混合排水１リットルあたり４５．７ミリリッ
トル（セレン１モルに対して３２６モルのＦｅ）の量で
添加し、５分間攪拌した後、水酸化ナトリウムを添加
し、１分間攪拌して、ｐＨを６〜７に調整した。これ
を、１分間攪拌した後、さらに、凝集剤として、０．２
％溶液のダイヤフロック（ＡＰ１２０Ｃ）を、混合排水
１リットルあたり１０ｍｇ（固形分換算で１０ｐｐｍ）
添加し、生成した凝集沈殿物を除去した。上記処理後の
水について、上記実施例と同様にセレンの含有量を測定
し、併せてヒ素の含有量を測定したところ、セレンは
１．０ｐｐｍまで除去されており、ヒ素は約０．０４ｐ
ｐｍまで除去されていた。 Example 4 As a wastewater from a smelter, mixed wastewater in which primary neutralized thickener overflow: by-product raw water: tertiary neutralized thickener UF return was mixed at a ratio of 2: 2: 1 was used in the same manner as in the above embodiment. Was measured, and the content of arsenic was also measured.
03 ppm of arsenic was detected. This mixed wastewater was treated according to the following procedure. First, as a primary treatment for the purpose of removing arsenic, 17.6 ml of iron (III) chloride (37.8% aqueous solution) was added to 1 liter of mixed waste water, stirred for 1 minute, and then sodium hydroxide was used. Then, the pH was adjusted to 12, and sludge was extracted. Next, as a secondary treatment for the purpose of removing selenium, first, 1 ml of hydrochloric acid (12N) per 1 liter of the mixed wastewater was added to the mixed wastewater that had been subjected to the primary treatment, and 1 ml of the mixed wastewater was added.
Stirred for minutes. The pH value at this time was about 2.0. Next, metal aluminum powder was added in an amount of 4000 mg (539 moles of aluminum per mole of selenium) per liter of mixed wastewater and stirred for 30 minutes. Next, iron (III) chloride (37.8% aqueous solution) was added as an iron compound in an amount of 45.7 ml (326 mol of Fe to 1 mol of selenium) per 1 liter of the mixed wastewater, followed by stirring for 5 minutes. After that, sodium hydroxide was added and the mixture was stirred for 1 minute to adjust the pH to 6-7. This was stirred for 1 minute, and then 0.2% as a flocculant.
% Of Diafloc (AP120C) at 10 mg per liter of mixed wastewater (10 ppm in terms of solid content)
Was added to remove the formed aggregate precipitate. For the water after the above treatment, the selenium content was measured in the same manner as in the above example, and the arsenic content was also measured. As a result, selenium was removed to 1.0 ppm, and arsenic was reduced to about 0.04 p.
pm.
【００１７】実施例５ 金属アルミニウム粉末に代えて、塩化アルミニウム水溶
液（３０％）を、アルミニウムが４０００ｍｇ添加され
ることとなる量で使用したことを除き、実施例４と同様
の処理を行なった。処理後の水について、上記実施例と
同様にセレンの含有量を測定したところ、セレンは１．
０ｐｐｍまで除去されていた。 Example 5 The same treatment as in Example 4 was performed, except that an aluminum chloride aqueous solution (30%) was used in place of the metal aluminum powder in an amount to which 4000 mg of aluminum was added. The selenium content of the treated water was measured in the same manner as in the above example.
It had been removed to 0 ppm.
フロントページの続き (73)特許権者 000005979 三菱商事株式会社 東京都千代田区丸の内２丁目６番３号 (74)上記３名の代理人 100059959 弁理士 中村 稔 （外９名） (72)発明者 辰巳 憲司 茨城県つくば市小野川16番３ 工業技術 院資源環境技術総合研究所内 (72)発明者 和田 愼二 茨城県つくば市小野川16番３ 工業技術 院資源環境技術総合研究所内 (72)発明者 湯川 恭啓 茨城県つくば市千現２丁目１番６号 三 菱商事株式会社内 (56)参考文献 特開 平９−314182（ＪＰ，Ａ) 特開 平７−289805（ＪＰ，Ａ) 特開 平８−309369（ＪＰ，Ａ) 特開 平11−169869（ＪＰ，Ａ) 特開 平10−36925（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) C02F 1/58 C02F 1/56 C22B 61/00 Continued on the front page (73) Patent holder 000005979 Mitsubishi Corporation 2-6-3 Marunouchi, Chiyoda-ku, Tokyo (74) The above three agents 100059959 Patent Attorney Minoru Nakamura (9 outsiders) (72) Inventor Kenji Tatsumi 16-3 Onogawa, Tsukuba, Ibaraki Pref., National Institute of Advanced Industrial Science and Technology (72) Inventor Shinji Wada 16-3 Onogawa, Tsukuba, Ibaraki Pref. Kei, 2-6-6 Sengen, Tsukuba-city, Ibaraki Pref. Mitsui Trading Co., Ltd. (56) References JP-A-9-314182 (JP, A) JP-A-7-289805 (JP, A) JP-A-8- 309369 (JP, A) JP-A-11-169869 (JP, A) JP-A-10-36925 (JP, A) (58) Fields investigated (Int. Cl. 7 , DB name) C02F 1/58 C02F 1 / 56 C22B 61/00
Claims (3)
に対して５モル以上のアルミニウム及び５モル以上の鉄
（III）を存在させる工程、 アルミニウム及び鉄（III）が存在するセレン含有水の
ｐＨを、４〜９の範囲内に調整する工程、 ｐＨを調整したセレン含有水を撹拌する工程、及び、 生成した沈殿物を除去する工程、 を含む、前記方法。1. A method for treating selenium-containing water, comprising: reducing selenium-containing water to at least 5 mol of aluminum and at least 5 mol of iron per 1 mol of selenium without performing a reduction treatment.
(III) , a step of adjusting the pH of the selenium-containing water in which aluminum and iron (III) are present within a range of 4 to 9, a step of stirring the pH-adjusted selenium-containing water, and Removing the deposited precipitate.
（III）を存在させる工程において、塩化アルミニウム
及び／又は塩化鉄（III）をセレン含有水に添加する、
請求項１に記載の方法。2. The selenium-containing water contains aluminum and iron.
(III) in the step of adding aluminum chloride and / or iron (III) chloride to the selenium-containing water,
The method of claim 1.
請求項１又は２に記載の方法。3. The method according to claim 1, further comprising a step of adding a flocculant.
The method according to claim 1.
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