JP2005013976A - Method for removing arsenic - Google Patents
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- JP2005013976A JP2005013976A JP2003205096A JP2003205096A JP2005013976A JP 2005013976 A JP2005013976 A JP 2005013976A JP 2003205096 A JP2003205096 A JP 2003205096A JP 2003205096 A JP2003205096 A JP 2003205096A JP 2005013976 A JP2005013976 A JP 2005013976A
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- arsenic
- magnesium
- magnesium alloy
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Abstract
Description
【０００１】
【発明の属する技術分野】
本発明は、砒素を除去する方法に係わり、更に詳しくは、水に含まれた砒素を吸着して分離除去する方法にかかわるものである。
【０００２】
【従来の技術】
砒素は生物にとっては猛毒の元素で、通常、熱水、熱気鉱床の旧鉱山廃水、温泉水や地熱発電所等の排温水等の地下水や、産業廃棄物、都市ゴミ焼却灰・飛灰、電気炉製鋼ダスト等に含有されている。除去に当たっては、通常溶出して除去する方法がとられている。
溶出して除去する方法としては、
▲１▼共沈法（塩化第一鉄、ポリ塩化アルミニウム等と）
▲２▼吸着剤ろ過法（砂鉄に吸着）
▲３▼逆浸透法
▲４▼活性アルミナ法
▲５▼ゼオライト吸着法
等がある。
活性アルミナに吸着させる方法は特開平１１−０１９５０６号に、鉄塩又はアルミニウム塩に吸着させる方法は特開平１０−０５７８０４号公報に記載されている。これら砒素を吸着させたものは、通常脱水機で脱水後、水は放流し、沈澱物はセメントを添加して混練り固化後、埋立処分等を行っているのが現状である。
【０００３】
活性アルミナ、二酸化マンガン、酸化鉄、酸化第二鉄等の吸着材は、酸性の水に対しては適度の砒素除去性能を示すものの、ｐＨ７超のアルカリ性である水に対しては除去性能が十分でなかった。その為、処理すべき水を酸性にＰＨ調整しなければならない。欠点があった。
【０００４】
特開２０００−０３３３８７号公報には、マグネシウム、アルミニウムの炭酸塩に砒素を吸着させる方法が記載されているが、吸着効率に問題点がある。
【０００５】
【発明が解決しようとする課題】
本発明はかかる問題点に鑑みてなされたもので、ｐＨ７超の砒素のアルカリ性液に対して有効で、効率よく砒素を吸着除去できる新規な方法を提供せんとするものである。
【０００６】
【課題を解決するための手段】
本発明者らは上記問題に関して鋭意検討した結果、次の知見を得た。すなわち、砒素を含むｐＨ７超のアルカリ性の水に、純マグネシウム、マグネシウム合金を接触させると、砒素を効率良く吸着除去できることを見い出した。
本発明は、上記知見に基づいてなされたもので下記（１）〜（５）の構成からなる。
（１）砒素を含む水に、マグネシウムあるいはマグネシウム合金を主成分とする吸着材を浸漬して砒素を吸着せしめ、脱水濾過して砒素を分離除去することを特徴とする砒素の除去方法。
（２）上記吸着材が純マグネシウム又はマグネシウム合金の粉末である上記（１）に記載の除去方法。
（３）上記吸着材が純マグネシウム又はマグネシウム合金のリボンである上記（１）に記載の除去方法。
（４）上記吸着材が純マグネシウム又はマグネシウム合金の多孔体である上記（１）に記載の除去方法。
（５）上記砒素を含む水がＰＨ７以上の水である上記（１）〜（４）のいずれかに記載の除去方法。
【０００７】
【発明の実施の形態】
本発明の砒素吸着材は、マグネシウムあるいはマグネシウム合金を主成分とする材料からなる。マグネシウム合金はＭｇ成分８５％以上含有する合金が好ましい。８５％未満では吸着効率が落ちる。
【０００８】
これらの材料は、粉末、リボン状、薄片状の形で砒素を含む水に混合して砒素を吸着させる。あるいは多孔質に加工してフィルターとして使用する。
【０００９】
フィルターは、純マグネシウム又はマグネシウム合金粉末を使って多孔質に焼結したものでもよいし、あるいは純マグネシウム又はマグネシウム合金の繊維、リボン、薄片を無作為の堆積させた、いわゆる不織布の形でもよい。不織布は必要に応じて焼結してもよい。
【００１０】
【実施例】
【実施例１】本発明の作用効果を確認するために行った実施例について説明する。
従来技術の吸着材として最も一般的に使用されている炭素鋼を使用し、本願発明の材料と比較した。
吸着材は、それぞれ板、リボン、粒に加工して各々比較した。
使用した試料は下記のとおりである。
（１）純マグネシウム、マグネシウム合金の板、粒、リボン
（２）炭素鋼の板、粒、リボン
板は、円板（４０ｍｍφ、厚さ５ｍｍ）、リボンは、巾５ｍｍ、厚さ０．１ｍｍ、粒の粒径は０．８〜３ｍｍである。
使用した試料の化学分析値を表１に示す。
即ち、純水１０リットルに、原子吸光用の砒酸標準液（１０００ｍｇ／ｌ）３ｍｌを溶かして作製した。砒素濃度は０．３０１ｇ／ｍｌ、ｐＨが６．９であった。
吸着テスト
試料約５〜２５ｇ（比重が異なるので容量的には大体同量になるように）を５００ｍｌ試薬ビンにとり、亜砒酸の調整液を５００ｍｌ加えスターラーで攪拌した。
時間経過毎（１、３、６、２４時間）に、採水を行い、ＩＣＰ法で砒素の分析を行った。
その結果を表２に示す。また、２４時間後のｐＨ分析結果を表２に示す。
本願発明は従来技術に比較して吸着速度が極めて速いことを確認できた。
【００１１】
【実施例２】
純マグネシウム、マグネシウム合金を粗砕し、１〜２ｍｍを篩い分けて取り、これを圧縮成形して厚さ１５ｍｍ、直径５ｃｍのフィルターを製作し、図１に示すガラス管を加工して製作した濾過器の底部に装着し、実施例１で作製した亜砒酸調整液を１０ｍｌ／ｍｉｎで３０分流し、フィルターに吸着した砒素の量を定量した。
使用した濾過器の略図を図１に示す。
測定結果を表３に示す。
以上実施例１、２で、マグネシウム、マグネシウム合金供に、微粉砕物、リボン、フィルターにして、その比表面積を大きくすると、吸着速度が極めて速くなり、１時間で人間に実質的に無害な濃度（０．０１ｍｇ／ｌ以下）まで低減できることを確認できた。
【００１２】
【発明の効果】
以上詳記したように、本発明は、砒素を含むｐＨ７超のアルカリ性水に対して、極めて簡便安価な方法で、従来の数倍から数十倍の速度で吸着除去できる特徴を有し、汚染された地下水の清浄化、及びＧａ−Ａｓ系焼却ダストに代表される含砒素産業廃棄物の無害化処理に多大に貢献するものである。
【図面の簡単な説明】
【図１】図１は実施例１に使用される濾過器の構造の説明図である。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for removing arsenic, and more particularly to a method for adsorbing and separating arsenic contained in water.
[0002]
[Prior art]
Arsenic is an extremely toxic element for living organisms. Usually, hot water, old mine wastewater from hot air deposits, groundwater such as hot water and hot water from geothermal power plants, industrial waste, municipal waste incineration ash / fly ash, electricity It is contained in furnace steel dust. For removal, a method of elution is usually employed.
As a method of elution and removal,
(1) Coprecipitation method (with ferrous chloride, polyaluminum chloride, etc.)
(2) Adsorbent filtration method (adsorption on iron sand)
(3) Reverse osmosis method (4) Activated alumina method (5) Zeolite adsorption method.
A method for adsorbing to activated alumina is described in JP-A-11-019506, and a method for adsorbing to activated salt or aluminum salt is described in JP-A-10-0578804. These arsenic adsorbents are usually dehydrated with a dehydrator, the water is discharged, the precipitate is added with cement, kneaded and solidified, and then landfilled.
[0003]
Adsorbents such as activated alumina, manganese dioxide, iron oxide, and ferric oxide exhibit moderate arsenic removal performance for acidic water, but are sufficient for removal of alkaline water with pH above 7. It was not. Therefore, the pH of the water to be treated must be adjusted to acidity. There were drawbacks.
[0004]
Japanese Patent Laid-Open No. 2000-033387 describes a method of adsorbing arsenic on magnesium and aluminum carbonates, but there is a problem in adsorption efficiency.
[0005]
[Problems to be solved by the invention]
The present invention has been made in view of such problems, and is intended to provide a novel method that is effective for an alkaline solution of arsenic having a pH higher than 7 and that can efficiently adsorb and remove arsenic.
[0006]
[Means for Solving the Problems]
As a result of intensive studies on the above problems, the present inventors have obtained the following knowledge. That is, it has been found that arsenic can be efficiently adsorbed and removed by contacting pure magnesium or a magnesium alloy with alkaline water having a pH of more than 7 containing arsenic.
This invention was made | formed based on the said knowledge, and consists of the structure of following (1)-(5).
(1) A method for removing arsenic, wherein an adsorbent containing magnesium or a magnesium alloy as a main component is immersed in water containing arsenic to adsorb arsenic, and dehydrated and filtered to separate and remove arsenic.
(2) The removing method according to the above (1), wherein the adsorbent is a powder of pure magnesium or a magnesium alloy.
(3) The removal method according to (1), wherein the adsorbent is a ribbon of pure magnesium or a magnesium alloy.
(4) The removal method according to (1), wherein the adsorbent is a porous body of pure magnesium or a magnesium alloy.
(5) The removal method according to any one of (1) to (4), wherein the water containing arsenic is water having a pH of 7 or more.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
The arsenic adsorbent of the present invention is made of a material mainly composed of magnesium or a magnesium alloy. The magnesium alloy is preferably an alloy containing 85% or more of the Mg component. If it is less than 85%, the adsorption efficiency decreases.
[0008]
These materials are mixed with water containing arsenic in the form of powder, ribbon or flakes to adsorb arsenic. Alternatively, it is processed into a porous material and used as a filter.
[0009]
The filter may be sintered in a porous manner using pure magnesium or magnesium alloy powder, or may be in the form of a so-called nonwoven fabric in which fibers, ribbons, and flakes of pure magnesium or magnesium alloy are randomly deposited. The nonwoven fabric may be sintered as necessary.
[0010]
【Example】
[Embodiment 1] An embodiment carried out for confirming the function and effect of the present invention will be described.
The carbon steel most commonly used as a prior art adsorbent was used and compared to the material of the present invention.
The adsorbents were processed into plates, ribbons, and grains, respectively, and compared.
The samples used are as follows.
(1) Pure magnesium, magnesium alloy plate, grain, ribbon (2) Carbon steel plate, grain, ribbon plate is a disc (40 mmφ, thickness 5 mm), ribbon is 5 mm wide, 0.1 mm thick, The grain size is 0.8-3 mm.
The chemical analysis values of the used samples are shown in Table 1.
That is, it was prepared by dissolving 3 ml of an arsenic acid standard solution for atomic absorption (1000 mg / l) in 10 liters of pure water. The arsenic concentration was 0.301 g / ml and the pH was 6.9.
About 5 to 25 g of the adsorption test sample (because the specific gravity is different so that the volume is approximately the same) was placed in a 500 ml reagent bottle, and 500 ml of an arsenous acid adjusting solution was added and stirred with a stirrer.
Water was collected every time (1, 3, 6, 24 hours), and arsenic was analyzed by ICP method.
The results are shown in Table 2. The results of pH analysis after 24 hours are shown in Table 2.
It has been confirmed that the present invention has an extremely high adsorption rate compared to the prior art.
[0011]
[Example 2]
Crushing pure magnesium and magnesium alloy, sieving 1 to 2 mm, and compressing this to produce a filter with a thickness of 15 mm and a diameter of 5 cm, and processing the glass tube shown in FIG. The arsenous acid adjusting solution prepared in Example 1 was flowed at 10 ml / min for 30 minutes, and the amount of arsenic adsorbed on the filter was quantified.
A schematic of the filter used is shown in FIG.
Table 3 shows the measurement results.
In Examples 1 and 2 above, when the specific surface area is increased by using finely pulverized products, ribbons, and filters for magnesium and magnesium alloys, the adsorption speed becomes extremely high, and the concentration is substantially harmless to humans in one hour. It was confirmed that the amount could be reduced to 0.01 mg / l or less.
[0012]
【The invention's effect】
As described in detail above, the present invention has a feature that it can be adsorbed and removed at a rate several times to several tens times as high as that of alkaline water containing arsenic and having a pH of more than 7 by a very simple and inexpensive method. It contributes greatly to the purification of groundwater and the detoxification treatment of arsenic-containing industrial waste represented by Ga-As incineration dust.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram of the structure of a filter used in Example 1. FIG.
Claims (5)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003205096A JP4182477B2 (en) | 2003-06-25 | 2003-06-25 | Arsenic removal method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003205096A JP4182477B2 (en) | 2003-06-25 | 2003-06-25 | Arsenic removal method |
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|---|---|
| JP2005013976A true JP2005013976A (en) | 2005-01-20 |
| JP4182477B2 JP4182477B2 (en) | 2008-11-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2003205096A Expired - Lifetime JP4182477B2 (en) | 2003-06-25 | 2003-06-25 | Arsenic removal method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006167564A (en) * | 2004-12-15 | 2006-06-29 | Kyushu Institute Of Technology | Method for separating metal ion |
| CN104107677A (en) * | 2013-04-17 | 2014-10-22 | 中国科学院大学 | Novel arsenic adsorption material |
-
2003
- 2003-06-25 JP JP2003205096A patent/JP4182477B2/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006167564A (en) * | 2004-12-15 | 2006-06-29 | Kyushu Institute Of Technology | Method for separating metal ion |
| JP4548655B2 (en) * | 2004-12-15 | 2010-09-22 | 国立大学法人九州工業大学 | Metal ion separation method |
| CN104107677A (en) * | 2013-04-17 | 2014-10-22 | 中国科学院大学 | Novel arsenic adsorption material |
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| Publication number | Publication date |
|---|---|
| JP4182477B2 (en) | 2008-11-19 |
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