JP2001149926A - Adsorbent and water treatment method using the same - Google Patents

Adsorbent and water treatment method using the same

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Publication number
JP2001149926A
JP2001149926A JP33686099A JP33686099A JP2001149926A JP 2001149926 A JP2001149926 A JP 2001149926A JP 33686099 A JP33686099 A JP 33686099A JP 33686099 A JP33686099 A JP 33686099A JP 2001149926 A JP2001149926 A JP 2001149926A
Authority
JP
Japan
Prior art keywords
water
adsorbent
treated
arsenic
treatment method
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.)
Pending
Application number
JP33686099A
Other languages
Japanese (ja)
Other versions
JP2001149926A5 (en
Inventor
Kenji Watari
謙治 亘
Yoshikimi Watanabe
義公 渡辺
Genzo Ozawa
源三 小澤
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Rayon Co Ltd
Original Assignee
Mitsubishi Rayon Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mitsubishi Rayon Co Ltd filed Critical Mitsubishi Rayon Co Ltd
Priority to JP33686099A priority Critical patent/JP2001149926A/en
Publication of JP2001149926A publication Critical patent/JP2001149926A/en
Publication of JP2001149926A5 publication Critical patent/JP2001149926A5/ja
Pending legal-status Critical Current

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Classifications

    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/30—Wastewater or sewage treatment systems using renewable energies
    • Y02W10/37—Wastewater or sewage treatment systems using renewable energies using solar energy

Landscapes

  • Separation Using Semi-Permeable Membranes (AREA)
  • Treatment Of Liquids With Adsorbents In General (AREA)
  • Water Treatment By Sorption (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide an adsorbent which is capable of efficiently removing arsenic compounds existing in water to be treated at a low cost and a water treatment method using the same. SOLUTION: This water treatment method has an adsorption stage of bringing the water 7 to be treated which contains arsenic into contact with the adsorbent which consists of the sludge generated in a stage for cleaning raw water of <=50 ppb in arsenic content and has a moisture content of 25.0 to 99.9 wt.%.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【０００１】[0001]

【発明の属する技術分野】本発明は、浄水処理、河川水
処理、地下水処理、下排水処理等の各種の水処理の分野
で、特にヒ素を含む水を処理するのに好適な吸着剤およ
び水処理方法に関する。The present invention relates to an adsorbent and water suitable for treating arsenic-containing water in various water treatment fields such as water purification treatment, river water treatment, groundwater treatment, sewage treatment and the like. Regarding the processing method.

【０００２】[0002]

【従来の技術】近年、湖沼や河川における水質悪化が大
きな問題として認識されている。その中でも有害な重金
属化合物による汚染は重要な問題とされており、特に注
目されているのは、ヒ素化合物による汚染である。ヒ素
は古くから顔料や薬物として利用されており、多くは木
材防腐剤や農薬に使用されているが、近年では半導体材
料としても利用されている。また、自然界では金属硫化
物中にニッケル、銅等のヒ化物、あるいはカルシウム、
鉄、鉛等のヒ酸塩として存在する。ヒ素化合物による水
質汚染は、ヒ素含有物質の不注意な取り扱い、鉱物の開
発利用、化石燃料の消費、地熱水の開発利用、岩石の風
化作用等によって引き起こされる。水道法における水道
水質基準では、水中のヒ素濃度は０．０１ｍｇ／リット
ル以下とされており、ヒ素濃度がこれを超える場合は、
水中よりヒ素化合物の除去を行うことが必要となる。2. Description of the Related Art In recent years, deterioration of water quality in lakes and rivers has been recognized as a major problem. Among them, contamination with harmful heavy metal compounds is regarded as an important problem, and particular attention is paid to arsenic compounds. Arsenic has been used as a pigment and a drug for a long time, and is mostly used for wood preservatives and pesticides, but has recently been used as a semiconductor material. In the natural world, metal sulfides include arsenic such as nickel and copper, or calcium,
Present as arsenate such as iron and lead. Water pollution by arsenic compounds is caused by careless handling of arsenic-containing substances, exploitation of minerals, consumption of fossil fuels, exploitation of geothermal water, weathering of rocks, and the like. According to the tap water quality standard in the Water Supply Law, the arsenic concentration in water is 0.01 mg / liter or less, and when the arsenic concentration exceeds this,
It is necessary to remove arsenic compounds from water.

【０００３】従来より知られているヒ素化合物の除去方
法としては、凝集分離法、逆浸透法、吸着コロイド浮上
法、吸着法の４種類が主に挙げられる。これらの内、凝
集分離法は、大量のスラッジが発生し、このスラッジの
処理など煩雑な作業が必要となる問題がある。また、逆
浸透法は、ヒ素化合物の除去率においては優れるが、高
い水圧が要求されるためランニングコストが高くなると
共に、膜への負荷が大きくなるので高強度の膜が要求さ
れるほか、膜の汚染を除去する工程が必要である等の点
で不都合を有する。さらに、吸着コロイド浮上法におい
ては、系内に界面活性剤を投入する必要があることや、
ｐＨの範囲を４〜５に設定する必要があり、後処理が必
要となるなど作業が煩雑である点で不便である。Conventionally known methods for removing arsenic compounds are mainly classified into four types: agglomeration separation, reverse osmosis, adsorbed colloid flotation, and adsorption. Among them, the coagulation separation method has a problem that a large amount of sludge is generated and a complicated operation such as treatment of the sludge is required. In addition, the reverse osmosis method is excellent in the removal rate of arsenic compounds, but requires high water pressure, which increases running costs and increases the load on the membrane, so that a high-strength membrane is required. This is disadvantageous in that a step of removing contamination is required. Furthermore, in the adsorption colloid flotation method, it is necessary to introduce a surfactant into the system,
It is necessary to set the pH range to 4 to 5, which is inconvenient in that the operation is complicated, such as the need for post-treatment.

【０００４】[0004]

【発明が解決しようとする課題】そこで、ヒ素化合物の
効果的な除去方法として、吸着法がしばしば用いられ
る。この場合の吸着剤としては、活性炭、キレート樹
脂、活性アルミナ、希土類化合物が挙げられる。活性炭
は、安価で入手し易いが吸着量がやや少ないため、吸着
剤の交換頻度が高いので運転コストが高くつくという問
題があった。キレート樹脂は、ヒ素化合物の吸着におけ
る選択性が高いが、吸着容量としては活性炭をわずかに
上回る程度であり、キレート樹脂自体が比較的高価であ
る。活性アルミナや希土類化合物は、吸着量は高いが、
吸着剤として加工されたものが非常に高価であり、大量
に要する場合には、大きなコストを要するという不都合
があった。本発明の目的は、被処理水中に存在するヒ素
化合物を低コストで、効率よく除去することができる吸
着剤、およびこれを用いた水処理方法を提供することに
ある。Accordingly, an adsorption method is often used as an effective method for removing arsenic compounds. Examples of the adsorbent in this case include activated carbon, chelate resin, activated alumina, and rare earth compounds. Activated carbon is inexpensive and easily available, but has a problem in that since the amount of adsorption is rather small, the frequency of replacement of the adsorbent is high and the operating cost is high. The chelate resin has high selectivity in adsorption of arsenic compounds, but has an adsorption capacity slightly higher than that of activated carbon, and the chelate resin itself is relatively expensive. Activated alumina and rare earth compounds have a high adsorption amount,
What is processed as an adsorbent is very expensive, and when a large amount is required, there is a disadvantage that a large cost is required. An object of the present invention is to provide an adsorbent capable of efficiently removing arsenic compounds present in water to be treated at low cost and a water treatment method using the same.

【０００５】[0005]

【課題を解決するための手段】前記課題を解決するため
に、本発明の吸着剤は、ヒ素含有量が５０ｐｐｂ以下の
原水を浄水処理する工程で発生した汚泥からなり、水分
含有量が２５．０〜９９．９重量％であることを特徴と
する。ヒ素含有量が１０ｐｐｂ以下の原水を浄水処理す
る工程で発生した汚泥からなるものがより好ましい。ま
た吸着剤に含まれる固形分中に占めるアルミニウムの含
有量が５〜４５重量％であることが好ましく、前記汚泥
が、河川水あるいは湖沼水の浄水処理工程で発生した汚
泥であることが好ましい。また本発明の水処理方法は、
ヒ素を含む被処理水を、本発明の吸着剤に接触させる吸
着工程を有することを特徴とする。前記吸着工程におい
て、前記被処理水中に前記吸着剤を分散させることが好
ましく、あるいは前記吸着剤を充填した吸着塔に前記被
処理水を通水することが好ましい。また本発明の水処理
方法は、ヒ素を含む被処理水を、本発明の吸着剤に接触
させる吸着工程と、膜分離手段で濾過する濾過工程とを
有することを特徴とする。前記濾過工程において、前記
膜分離手段を前記被処理水中に浸漬させて、前記膜分離
手段の二次側を吸引することが好ましく、あるいは前記
膜分離手段を前記被処理水中に浸漬させて、前記膜分離
手段の一次側を加圧することが好ましい。また前記吸着
工程において、前記吸着剤を充填した吸着塔に前記被処
理水を通水することが好ましく、あるいは前記吸着剤を
分散させた前記被処理水中に前記膜分離手段を浸漬させ
ることが好ましい。前記膜分離手段として多孔質中空糸
膜モジュールを用いることが好ましい。Means for Solving the Problems To solve the above problems, the adsorbent of the present invention comprises sludge generated in a step of purifying raw water having an arsenic content of 50 ppb or less, and has a water content of 25. 0 to 99.9% by weight. What consists of sludge generated in the process of purifying raw water having an arsenic content of 10 ppb or less is more preferable. The content of aluminum in the solid content contained in the adsorbent is preferably 5 to 45% by weight, and the sludge is preferably sludge generated in a water purification process of river water or lake water. In addition, the water treatment method of the present invention,
It is characterized by having an adsorption step of bringing the water to be treated containing arsenic into contact with the adsorbent of the present invention. In the adsorption step, the adsorbent is preferably dispersed in the water to be treated, or the water to be treated is preferably passed through an adsorption tower filled with the adsorbent. Further, the water treatment method of the present invention is characterized by comprising an adsorption step of bringing arsenic-containing water to be treated into contact with the adsorbent of the present invention, and a filtration step of filtering with a membrane separation means. In the filtration step, it is preferable that the membrane separation means is immersed in the water to be treated and the secondary side of the membrane separation means is sucked, or the membrane separation means is immersed in the water to be treated, It is preferable to pressurize the primary side of the membrane separation means. Further, in the adsorption step, it is preferable that the water to be treated is passed through an adsorption tower filled with the adsorbent, or that the membrane separation means is immersed in the water to be treated in which the adsorbent is dispersed. . It is preferable to use a porous hollow fiber membrane module as the membrane separation means.

【０００６】[0006]

【発明の実施の形態】以下、本発明を詳しく説明する。
本発明の吸着剤は、各種の浄水処理工程において発生し
た汚泥からなるものである。具体的には、例えば上水道
用途を目的とした河川や湖沼の水の浄化処理、一般家庭
の排水を固液分離する排水処理、工場排水等を処理する
産業排水処理において、被処理水中の粒子や固形分を、
濾過や重力分離などによって分離して得られた汚泥が好
適に用いられる。このような汚泥には灰分が含まれてお
り、この灰分がヒ素化合物との高い親和力を有するの
で、ヒ素化合物を有効に吸着することができる。特に本
発明では、汚泥としてヒ素含有量が５０ｐｐｂ以下の原
水を浄水処理する工程で発生したものが用いられる。ヒ
素含有量が５０ｐｐｂを超える原水の浄水処理工程で発
生した汚泥は、この汚泥に既に吸着しているヒ素化合物
が多いために、その分だけヒ素化合物を吸着する能力が
低減しており、ヒ素化合物の吸着剤としての効果が十分
に得られない。したがって、ヒ素含有量が少ない原水の
浄水処理で発生した汚泥を用いることが好ましく、ヒ素
含有量が１０ｐｐｂ以下の原水を浄水処理する工程で発
生した汚泥がより好ましい。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail.
The adsorbent of the present invention comprises sludge generated in various water purification treatment steps. Specifically, for example, in water purification treatment of rivers and lakes for the purpose of water supply, wastewater treatment for solid-liquid separation of general household wastewater, industrial wastewater treatment of industrial wastewater, etc. The solid content,
Sludge obtained by filtration or gravity separation is suitably used. Such sludge contains ash, and the ash has a high affinity with the arsenic compound, so that the arsenic compound can be effectively adsorbed. Particularly, in the present invention, sludge generated in the step of purifying raw water having an arsenic content of 50 ppb or less is used. The sludge generated in the purification process of raw water having an arsenic content of more than 50 ppb has a large amount of arsenic compounds already adsorbed on the sludge, so that the ability to adsorb the arsenic compound is reduced by that much, Cannot be sufficiently effective as an adsorbent. Therefore, it is preferable to use sludge generated in the water purification treatment of raw water having a small arsenic content, and more preferably sludge generated in the step of purifying raw water having an arsenic content of 10 ppb or less.

【０００７】また良好な吸着能を得るために、吸着剤の
水分含有量は２５．０〜９９．０重量％の範囲内とする
のが好ましい。その理由としては以下のことが考えられ
る。すなわち、本発明において吸着剤に含まれる汚泥の
粒子には、吸着サイトがあってここに被処理水中のヒ素
化合物が接近することによって吸着が行われるが、吸着
剤中に水分が無いとヒ素化合物の物質移動が生じ難いの
で、吸着サイトにヒ素化合物が到達し難くなる。ところ
で汚泥の粒子は、その表面に微細な凹凸が形成されてお
り一種の多孔質体となっている。したがって、汚泥から
なる吸着剤中には、汚泥粒子自体の凹凸による一次間隙
と、汚泥の粒子と粒子との間に存在する二次間隙の２種
類の空間が存在している。二次間隙は、その内部の水が
除去されても吸着剤が水と接触することにより再び濡れ
た状態となり易いのに対して、一次間隙は、例えば乾燥
等により水が除去されると、吸着剤が水と接触した場合
にも濡れた状態とはなり難い。このため、一次間隙中の
水分が除去されない程度に吸着剤の水分含有量を保持し
た方が、乾燥した汚泥を用いた場合よりも高い吸着能を
得ることができる。具体的には、吸着剤の水分含有量が
２５重量％より低くなると一次間隙の水分が除去されて
吸着能が低下する。一方、水分含有量の上限は９９．９
重量％程度まで高くてもよいが、水分含有量が高くなる
ほど吸着剤中の吸着に関与する成分の濃度は低くなる。
水分含有量が９９．９重量％を超えると吸着剤の大部分
が水分となるので、水処理に大量の吸着剤を使用しなけ
ればならず、処理操作が困難となるので、吸着剤の水分
含有量は３０〜９７重量％の範囲とすることがより好ま
しく、さらに好ましくは４０〜８５重量％とする。[0007] In order to obtain good adsorbability, it is preferable that the water content of the adsorbent is in the range of 25.0 to 99.0% by weight. The following can be considered as the reason. That is, in the present invention, the sludge particles contained in the adsorbent have an adsorption site where the arsenic compound in the water to be treated approaches to perform adsorption, but if there is no moisture in the adsorbent, the arsenic compound , It is difficult for the arsenic compound to reach the adsorption site. By the way, the sludge particles have fine irregularities formed on the surface, and are a kind of porous body. Therefore, in the adsorbent composed of sludge, there are two types of spaces, a primary gap formed by the unevenness of the sludge particles themselves, and a secondary gap existing between the sludge particles. The secondary gap is easily wetted again when the adsorbent comes into contact with water even if the water inside the secondary gap is removed, whereas the primary gap is adsorbed when the water is removed, for example, by drying. Even when the agent comes into contact with water, it does not easily become wet. For this reason, when the water content of the adsorbent is maintained to such an extent that the water in the primary gap is not removed, a higher adsorptivity can be obtained than when dry sludge is used. Specifically, when the water content of the adsorbent is lower than 25% by weight, the water in the primary gap is removed, and the adsorbability is reduced. On the other hand, the upper limit of the water content is 99.9.
Although it may be as high as about% by weight, the higher the water content, the lower the concentration of components involved in adsorption in the adsorbent.
When the water content exceeds 99.9% by weight, most of the adsorbent becomes water. Therefore, a large amount of the adsorbent must be used for water treatment, and the treatment operation becomes difficult. The content is more preferably in the range of 30 to 97% by weight, and still more preferably 40 to 85% by weight.

【０００８】また汚泥に含まれる灰分の中でも特にアル
ミニウムはヒ素化合物の吸着能が高いので、アルミニウ
ムを含む汚泥を用いることが好ましく、吸着剤に含まれ
る固形分中のアルミニウム含有量が５〜４５重量％であ
る吸着剤とすると、高い効率でヒ素化合物の除去が可能
である。したがって、アルミニウム系化合物からなる凝
集剤を使用する浄水処理工程で発生した汚泥はアルミニ
ウムを含んでいるので好ましく用いられる。具体的に
は、河川水や湖沼水の浄水処理工程で発生する汚泥は、
灰分が多く含まれるうえ、浄水処理工程の濾過工程にお
いてアルミ系化合物の凝集剤が投入されるので好ましく
用いられる。汚泥中のアルミニウムの含有量が５重量％
より小さくてもヒ素化合物を吸着することはできるが高
い吸着能が得られず、水処理の効率が良くない。またア
ルミニウムの含有量が４５重量％を越えるものは、吸着
剤の水分含有量が２０％以下に低下するので、前述した
理由により好ましくない。なお、汚泥中のアルミニウム
含有量は蛍光Ｘ線による元素分析により測定される。[0008] Among the ash components contained in the sludge, aluminum has a high ability to adsorb arsenic compounds. Therefore, it is preferable to use sludge containing aluminum, and the aluminum content in the solid content contained in the adsorbent is 5 to 45% by weight. %, The arsenic compound can be removed with high efficiency. Therefore, the sludge generated in the water purification process using the coagulant made of an aluminum-based compound is preferably used because it contains aluminum. Specifically, sludge generated in the purification process of river water and lake water,
It is preferably used because it contains a large amount of ash and a coagulant of an aluminum compound is added in the filtration step of the water purification treatment step. Aluminum content in sludge is 5% by weight
Even if smaller, the arsenic compound can be adsorbed, but high adsorption ability cannot be obtained, and the efficiency of water treatment is not good. If the content of aluminum exceeds 45% by weight, the water content of the adsorbent is reduced to 20% or less, which is not preferable for the above-mentioned reason. The aluminum content in the sludge is measured by elemental analysis using fluorescent X-rays.

【０００９】本発明においては、各種水処理で発生した
汚泥を、何も処理せずそのまま吸着剤として用いてもよ
く、あるいは濃縮などの物理的処理をしたものや、適宜
の添加物を加えて加工したものを用いてもよい。汚泥の
水分量が多すぎると、吸着剤として取り扱い難いので、
ある程度水分を除いて汚泥を濃縮してもよい。汚泥の濃
縮方法としては、例えばフィルタープレスなどによる濾
過や天日による水分の除去が挙げられる。このようにし
て濃縮された汚泥は粘度状あるいは粘度の高い液状とな
り、これを吸着剤として被処理水中に分散させたり、吸
着塔に充填したりして用いることができる。In the present invention, sludge generated by various water treatments may be used as an adsorbent without any treatment, or may be subjected to a physical treatment such as concentration, or to the addition of an appropriate additive. A processed one may be used. If the water content of the sludge is too large, it is difficult to handle as an adsorbent,
The sludge may be concentrated by removing some water. Examples of the sludge concentration method include filtration using a filter press or the like and removal of moisture by sunlight. The sludge thus concentrated becomes a viscous or highly viscous liquid, which can be used as an adsorbent by dispersing it in the water to be treated or by filling it in an adsorption tower.

【００１０】本発明の吸着剤は、これとヒ素を含む被処
理水とを接触させることにより、被処理水中のヒ素化合
物を吸着して除去することができる。吸着剤と被処理水
とを接触させる方法は特に限定されず、例えば、ヒ素を
含む被処理水中に吸着剤を分散、懸濁させて用いてもよ
く、あるいはカラム等の吸着塔内に吸着剤を充填し、そ
の吸着塔内に被処理水を通水する方法でもよい。尚、水
処理を行う際に、本発明の吸着剤を単独で用いても構わ
ないし、他の種類の吸着剤を組み合わせて使用しても構
わない。[0010] The adsorbent of the present invention can adsorb and remove arsenic compounds in the water to be treated by contacting the adsorbent with the water to be treated containing arsenic. The method of contacting the adsorbent with the water to be treated is not particularly limited, and for example, the adsorbent may be dispersed and suspended in the water to be treated containing arsenic, or may be used in an adsorption tower such as a column. And a method in which the water to be treated is passed through the adsorption tower. When performing the water treatment, the adsorbent of the present invention may be used alone, or another type of adsorbent may be used in combination.

【００１１】また、ヒ素を含む被処理水を、本発明の吸
着剤に接触させる吸着工程と、膜分離手段で濾過する濾
過工程とを組み合わせて被処理水を処理すると、より効
果的である。この方法では、本発明の吸着剤により効率
よく被処理水中のヒ素化合物を除去できると同時に、濾
過工程において被処理水中の濁質を除去することができ
るので、水の高度な浄化が可能となる。上記吸着工程と
濾過工程は、どちらを先に行ってもよい。ここで、被処
理水中の濁質は被処理水の種類によっても異なるが、主
成分としては、例えば砂や土壌に由来するシリカ、酸化
マグネシウムなどのマグネシウム化合物、酸化カルシウ
ムなどのカルシウム化合物、酸化鉄などの鉄化合物、お
よび二酸化マンガンなどのマンガン化合物等の無機物、
あるいはフミン酸、藻類、菌類等の有機物が挙げられ
る。Further, it is more effective to treat the water to be treated by combining the adsorption step of bringing the water to be treated containing arsenic into contact with the adsorbent of the present invention and the filtration step of filtering it with a membrane separation means. In this method, arsenic compounds in the water to be treated can be efficiently removed by the adsorbent of the present invention, and at the same time, turbid substances in the water to be treated can be removed in the filtration step. . Either the adsorption step or the filtration step may be performed first. Here, the turbidity in the water to be treated varies depending on the type of the water to be treated, but the main components are, for example, silica derived from sand or soil, magnesium compounds such as magnesium oxide, calcium compounds such as calcium oxide, and iron oxide. Inorganic substances such as iron compounds, and manganese compounds such as manganese dioxide,
Alternatively, organic substances such as humic acid, algae and fungi can be mentioned.

【００１２】上記濾過工程で用いられる膜分離手段とし
ては、水の濾過が可能な膜モジュールが好ましく用いら
れる。膜モジュールとしては、平膜タイプ、中空糸膜タ
イプ、管状タイプ、袋状タイプ等、任意の形態の濾過膜
を備えたものを用いることができる。これらの内、容積
当たりの膜面積が大きく、濾過量に優れることから、濾
過膜として多孔質中空糸膜を配設した多孔質中空糸膜モ
ジュールを用いることが特に好ましい。膜モジュールに
配設される濾過膜の素材としては特に制限はなく、セル
ロース系、ポリオレフィン、ポリスルホン、ポリアクリ
ロニトリル、ポリビニルアルコール、フッ素系ポリマ
ー、セラミックス等任意の素材からなる膜を用いること
ができる。また、膜モジュールに配設される濾過膜は、
多孔質でも非多孔質でも構わず、水の濾過が可能なもの
であれば差し支えない。多孔質膜を用いる場合、その孔
径は、水処理の目的に応じて、分離除去の対象とする濁
質の大きさによってどのような孔径のものでも選ぶこと
ができる。例えば濾過により細菌等を分離することを目
的とする場合には、０．２μｍ以下の平均孔径を有する
ものが好ましい。As the membrane separation means used in the filtration step, a membrane module capable of filtering water is preferably used. As the membrane module, a module having an arbitrary form of filtration membrane such as a flat membrane type, a hollow fiber membrane type, a tubular type, and a bag type can be used. Among these, it is particularly preferable to use a porous hollow fiber membrane module provided with a porous hollow fiber membrane as the filtration membrane because the membrane area per volume is large and the filtration amount is excellent. The material of the filtration membrane provided in the membrane module is not particularly limited, and a membrane made of any material such as cellulose, polyolefin, polysulfone, polyacrylonitrile, polyvinyl alcohol, fluoropolymer, and ceramics can be used. Further, the filtration membrane provided in the membrane module is:
It may be porous or non-porous, as long as it can filter water. When a porous membrane is used, any pore diameter can be selected according to the purpose of water treatment, depending on the size of the turbid substance to be separated and removed. For example, when the purpose is to separate bacteria and the like by filtration, those having an average pore diameter of 0.2 μm or less are preferable.

【００１３】本発明の水処理方法において、吸着工程と
濾過工程の組み合わせは任意であるが、例えば図１ある
いは図２に示すような構成の装置を用いて行うのが好ま
しい。以下、本発明の第１の実施形態について説明す
る。図１は、本実施形態に好適に用いられる装置の例を
示した概略構成図である。図中符号１は膜浸漬槽であ
る。膜浸漬槽１内には、ヒ素を含む被処理水７が連続的
あるいは断続的に供給されるように構成されており、こ
の膜浸漬槽１内の被処理水７中には、濾過膜が配設され
た膜モジュール３が浸漬されている。また膜浸漬槽１内
において、膜モジュール３の下方にはブロア６に接続さ
れた散気管５が配設されており、この散気管５からエア
ーが散気されるようになっている。膜モジュール３は膜
浸漬槽１外に設置された吸引ポンプ４に接続されてお
り、膜モジュール３の二次側すなわち濾過膜通過後の濾
過水が吸引されるように構成されている。濾過膜を透過
した濾過水は、消毒槽２に貯水されたのち、浄水９とし
て適宜放出される。In the water treatment method of the present invention, the combination of the adsorption step and the filtration step is optional, but it is preferable to use, for example, an apparatus having the structure shown in FIG. 1 or FIG. Hereinafter, a first embodiment of the present invention will be described. FIG. 1 is a schematic configuration diagram showing an example of an apparatus suitably used in the present embodiment. In the figure, reference numeral 1 denotes a membrane immersion tank. Arranged water 7 containing arsenic is continuously or intermittently supplied into the membrane immersion tank 1. A filtration membrane is provided in the water 7 to be treated in the membrane immersion tank 1. The disposed membrane module 3 is immersed. In the membrane immersion tank 1, an air diffuser 5 connected to a blower 6 is provided below the membrane module 3, and air is diffused from the air diffuser 5. The membrane module 3 is connected to a suction pump 4 installed outside the membrane immersion tank 1, and is configured to suck the filtrate on the secondary side of the membrane module 3, that is, after passing through the filtration membrane. The filtered water that has passed through the filtration membrane is stored in the disinfection tank 2 and then released as purified water 9 as appropriate.

【００１４】このような構成の装置を用いて水処理を行
うには、まず、膜浸漬槽１内の被処理水７に本発明の吸
着剤８を添加して撹拌し、吸着剤８を被処理水７中に分
散、懸濁させることによって、被処理水７中のヒ素化合
物を吸着剤８に吸着させる。これによって被処理水７は
ヒ素化合物が除去された処理水となる。撹拌は、散気管
５からエアーを散気することによって行うことができる
が、これとは別の撹拌手段を用いてもよい。また本実施
形態においては、吸着剤８の粒径が膜モジュール３の濾
過膜の平均孔径より大きくなるように吸着剤８および濾
過膜を選定して、吸着剤８が濾過膜を通過しないように
構成する。吸着剤８の添加量は、多すぎると攪拌の効果
が制約され、少なすぎるとヒ素化合物の除去が不十分と
なる。したがって、吸着剤８の吸着能によっても異なっ
てくるが、被処理水７の１リットルあたり０．００１〜
５００ｇとすることが好ましい。また、吸引ポンプ４で
膜モジュール３の二次側を吸引して、吸着剤によってヒ
素化合物が除去された処理水を濾過膜で濾過し、濾過後
の濾過水を消毒槽２へと送る。吸引ポンプ４による吸引
は吸着剤８の添加と同時と行ってもよく、添加後に行っ
てもよい。さらに、吸引中に散気管５からエアーを散気
して、膜浸漬槽１内のヒ素化合物を吸着した吸着剤８お
よび濁質が濾過膜の一次側に堆積することによって濾過
膜が目詰まりするのを低減する。この散気は、吸引中連
続的に行ってもいいし、間欠的に行っても差し支えな
い。また、吸引を行いつつ、膜浸漬槽１内で濃縮された
吸着剤８および濁質を、適宜引き抜きポンプ１０にて膜
浸漬槽外に排出するとともに、吸着剤８のヒ素化合物吸
着能力や処理時間等に応じて、適宜膜浸漬槽１内に吸着
剤８の補充を行うことが好ましい。In order to perform water treatment using the apparatus having such a configuration, first, the adsorbent 8 of the present invention is added to the water 7 to be treated in the membrane immersion tank 1 and stirred, and the adsorbent 8 is coated. By dispersing and suspending in the treated water 7, the arsenic compound in the treated water 7 is adsorbed on the adsorbent 8. As a result, the water to be treated 7 becomes treated water from which the arsenic compound has been removed. The stirring can be performed by diffusing air from the air diffuser 5, but another stirring means may be used. In the present embodiment, the adsorbent 8 and the filtration membrane are selected so that the particle diameter of the adsorbent 8 is larger than the average pore diameter of the filtration membrane of the membrane module 3 so that the adsorbent 8 does not pass through the filtration membrane. Constitute. If the amount of the adsorbent 8 is too large, the effect of stirring is restricted, and if the amount is too small, the removal of the arsenic compound becomes insufficient. Therefore, although it depends on the adsorbing capacity of the adsorbent 8, 0.001 to 1 liter of the water 7 to be treated is used.
It is preferably 500 g. Further, the secondary side of the membrane module 3 is sucked by the suction pump 4, the treated water from which the arsenic compound has been removed by the adsorbent is filtered by a filtration membrane, and the filtered water after filtration is sent to the disinfection tank 2. The suction by the suction pump 4 may be performed simultaneously with the addition of the adsorbent 8, or may be performed after the addition. Further, the air is diffused from the air diffuser 5 during the suction, and the adsorbent 8 and the turbid substance that have absorbed the arsenic compound in the membrane immersion tank 1 are deposited on the primary side of the filtration membrane, whereby the filtration membrane is clogged. To reduce. This air diffusion may be performed continuously during the suction or may be performed intermittently. In addition, while performing suction, the adsorbent 8 and the turbid matter concentrated in the membrane immersion tank 1 are appropriately discharged out of the membrane immersion tank by the extraction pump 10, and the arsenic compound adsorption capacity of the adsorbent 8 and the treatment time It is preferable to appropriately replenish the adsorbent 8 in the film immersion tank 1 according to the conditions.

【００１５】本実施形態の水処理方法によれば、膜モジ
ュール３にて被処理水７中の濁質を除去するとともに、
ヒ素化合物吸着後の吸着剤を処理水から分離することが
できるので、１つの膜浸漬槽１を用いた処理操作で、煩
雑な操作を伴うことなく、濁質もヒ素化合物も除去され
た浄水を効率良く得ることができる。このような本実施
形態の水処理方法は、特に浄水処理等に好適である。ま
た、散気管５からエアーを散気することによって、濾過
膜の目詰まりが低減されると同時に、膜浸漬槽１内の被
処理水７が吸着剤８とともに攪拌されるので、吸着剤８
によるヒ素化合物の除去効率も向上する。尚、本実施形
態においては膜モジュール３の吸引手段として吸引ポン
プ４を用いたが、他の吸引手段、例えば水頭差を利用し
たサイフォンによる自然吸引などであってもよい。According to the water treatment method of this embodiment, the turbidity in the water 7 to be treated is removed by the membrane module 3 and
Since the adsorbent after the adsorption of the arsenic compound can be separated from the treated water, the treatment operation using one membrane immersion tank 1 can remove the turbidity and the arsenic compound without complicated operations. It can be obtained efficiently. Such a water treatment method of the present embodiment is particularly suitable for water purification treatment and the like. By diffusing air from the air diffuser 5, clogging of the filtration membrane is reduced, and at the same time, the water 7 to be treated in the membrane immersion tank 1 is stirred with the adsorbent 8, so that the adsorbent 8
And the removal efficiency of the arsenic compound is also improved. In the present embodiment, the suction pump 4 is used as the suction means of the membrane module 3. However, other suction means, for example, a natural suction using a siphon utilizing a difference in head may be used.

【００１６】次に、本発明の第２の実施形態について説
明する。図２は、本実施形態に好適に用いられる装置の
例を示した概略構成図である。図中符号１１は内部の加
圧が可能な膜浸漬槽であり、本実施形態では加圧缶体が
用いられている。また符号１２は吸着塔であり、内部に
本発明の吸着剤が充填された吸着層を有する。加圧缶体
１１内には濾過膜が配設された膜モジュール（図示せ
ず）が設けられており、ヒ素化合物を含む被処理水７が
加圧された状態で、加圧缶体１１内の膜モジュールの一
次側へ連続的に供給されるように構成されている。具体
的には、加圧缶体１１を液密に構成し、その内部に膜モ
ジュールを配するとともに、膜モジュールの濾過膜を通
過した濾過水が加圧缶体１１外へ流出されるように構成
して、図示しないポンプで被処理水７を加圧缶体１１内
へ導入する。加圧缶体１１内に導入される被処理水７の
流速を大きくすることによって、濾過膜の一次側におけ
る被処理水７の圧力を高くすることができる。そして、
加圧缶体１１へ導入された被処理水７は、膜モジュール
の濾過膜を透過して、濁質が除去された濾過水となり、
続いて吸着塔１２に通水される。濾過液が吸着塔１２内
の吸着剤層を通過することで濾過液中のヒ素化合物が吸
着剤によって吸着、除去され、最終的に被処理水７中の
濁質及びヒ素化合物が除去された処理水が得られる。ま
た、必要に応じて吸着塔１２通過後の処理水を消毒する
手段を設けてもよい。Next, a second embodiment of the present invention will be described. FIG. 2 is a schematic configuration diagram showing an example of an apparatus suitably used in the present embodiment. In the figure, reference numeral 11 denotes a film dipping tank capable of pressurizing the inside, and in this embodiment, a pressurized can is used. Reference numeral 12 denotes an adsorption tower having an adsorption layer filled with the adsorbent of the present invention. A membrane module (not shown) provided with a filtration membrane is provided in the pressurized can 11, and the water 7 containing the arsenic compound is pressurized in the pressurized can 11. Is configured to be continuously supplied to the primary side of the membrane module. Specifically, the pressurized can 11 is configured to be liquid-tight, and a membrane module is disposed inside the pressurized can 11 so that filtered water that has passed through the filtration membrane of the membrane module flows out of the pressurized can 11. The water 7 to be treated is introduced into the pressurized can 11 by a pump (not shown). By increasing the flow rate of the water 7 to be introduced into the pressurized can 11, the pressure of the water 7 on the primary side of the filtration membrane can be increased. And
The water 7 to be treated introduced into the pressurized can 11 permeates through the filtration membrane of the membrane module and becomes filtered water from which turbid matter has been removed.
Subsequently, water is passed through the adsorption tower 12. As the filtrate passes through the adsorbent layer in the adsorption tower 12, the arsenic compound in the filtrate is adsorbed and removed by the adsorbent, and the turbidity and the arsenic compound in the water to be treated 7 are finally removed. Water is obtained. Further, a means for disinfecting the treated water after passing through the adsorption tower 12 may be provided as necessary.

【００１７】本実施形態の水処理方法によれば、律速と
なる膜モジュールによる濾過工程を加圧式で行うことに
より、この濾過工程の処理速度を高くすることができる
ので、全体の処理速度が高くなり、濁質及びヒ素化合物
を除去した処理水を効率良く得ることができる。また、
膜モジュールによる濾過を行った後の濾過水、すなわち
濁質が除去された濾過水が吸着塔１２に通水されるの
で、吸着塔１２に被処理水中の濁質が混入することがな
い。これによって吸着塔１２における通水路の目詰まり
や、吸着剤の吸着能力の低下が抑制されるので、吸着塔
１２における処理速度の低下が抑えられるとともに、吸
着剤の交換頻度も少なくて済むので処理効率が高くな
る。According to the water treatment method of the present embodiment, the filtration process using the membrane module, which is rate-determining, is performed in a pressurized manner, so that the treatment speed of this filtration process can be increased. Thus, treated water from which suspended matter and arsenic compounds have been removed can be efficiently obtained. Also,
Since the filtered water after the filtration by the membrane module, that is, the filtered water from which the turbid matter has been removed, is passed through the adsorption tower 12, the turbid substance in the water to be treated does not enter the adsorption tower 12. As a result, clogging of the water passage in the adsorption tower 12 and a decrease in the adsorbing capacity of the adsorbent are suppressed, so that a decrease in the processing speed in the adsorption tower 12 is suppressed and the frequency of replacement of the adsorbent is reduced, so that the treatment is performed. Increases efficiency.

【００１８】[0018]

【実施例】以下、具体的な実施例を示して本発明の効果
を明らかにする。以下の実施例において、各種の測定は
下記の方法により行った。 （１） ヒ素濃度 ＪＩＳ Ｋ０１０２における原子吸光法により測定し
た。 （２） 濁度 浄水試験法に制定されている散乱光測定法により測定し
た。 ［実施例１］河川水にポリ塩化アルミニウムを５０ｐｐ
ｍ投入し、ｐＨを７．０に調製した水を、砂濾過カラム
を用いて濾過を行い、砂濾過カラムの上部に濃縮された
汚泥を採取した。採取した汚泥の水分率を７０％まで脱
水を行い吸着剤とした。得られた吸着剤（汚泥）を蛍光
Ｘ線により元素分析したところ吸着剤に含まれる固形分
中のアルミニウム含有量は２１重量％であった。また原
水である河川水からはヒ素は検出されなかった。得られ
た吸着剤を用いて、ヒ素化合物の吸着を行った。すなわ
ち、ヒ素（Ｖ）濃度で５０μｇ／リットル、ｐＨ７のヒ
素含有水溶液１００ｍｌ中に、上記で作製した吸着剤１
００ｍｇを投入し、プロペラで攪拌しながら２時間対流
させた。２時間後攪拌を止め、上澄みのヒ素（Ｖ）の濃
度を調べたところ、６μｇ／リットルであった。EXAMPLES Hereinafter, the effects of the present invention will be clarified by showing specific examples. In the following examples, various measurements were performed by the following methods. (1) Arsenic concentration Measured by the atomic absorption method according to JIS K0102. (2) Turbidity The turbidity was measured by the scattered light measurement method established in the water purification test method. [Example 1] 50 pp of polyaluminum chloride in river water
m, and the water whose pH was adjusted to 7.0 was filtered using a sand filtration column, and concentrated sludge was collected at the top of the sand filtration column. The collected sludge was dehydrated to a moisture content of 70%, and used as an adsorbent. Elemental analysis of the obtained adsorbent (sludge) by fluorescent X-ray showed that the aluminum content in the solid content contained in the adsorbent was 21% by weight. Arsenic was not detected in the raw river water. Using the obtained adsorbent, arsenic compounds were adsorbed. That is, the adsorbent 1 prepared above was placed in 100 ml of an arsenic-containing aqueous solution having an arsenic (V) concentration of 50 μg / liter and a pH of 7.
Then, the solution was convected for 2 hours while stirring with a propeller. After 2 hours, the stirring was stopped and the concentration of arsenic (V) in the supernatant was determined to be 6 μg / liter.

【００１９】［実施例２］図１に示す水処理装置を用い
て水処理を行った。膜浸漬槽１としては容量１ｍ 3のも
のを用い、その中に中空糸膜モジュール３を配置した。
中空糸膜モジュール３としては、エチレン−ビニルアル
コール共重合体を表面に保持したポリエチレン製多孔質
中空糸膜（平均孔径０．１μｍ）がシート状に配列さ
れ、中空糸の両端がそれぞれ別の集水管内で開口するよ
うに樹脂で固定された平型中空糸膜モジュール（三菱レ
イヨン（株）製ステラポアーＬ）を用いた。この中空糸
膜モジュールの有効膜面積は８ｍ2であった。この中空
糸膜モジュール１本を、中空糸膜の長手方向が水平方向
に、そして中空糸膜のシート面が液面に対して垂直方向
になるように膜浸漬槽１内に配設した。そして、膜浸漬
槽１内に、ヒ素（Ｖ）濃度５０μｇ／リットル、濁度２
５度の被処理水７を導入して、中空糸膜モジュール３を
被処理水中に浸漬させた後に、この被処理水７中（１ｍ
3）に、実施例１で作製した吸着剤８を３００ｇ投入す
るとともに、散気管５からエアーを５０ｍ3／ｈの流量
で連続して散気することによって、膜浸漬槽１内を撹拌
して吸着剤８を被処理水７中に分散させた。吸着剤８の
投入と同時に吸引ポンプ４による吸引を開始した。吸引
ポンプ４は中空糸膜モジュール３の集水管に連通させ、
これにより中空糸膜モジュール３の二次側を吸引して濾
過処理を行った。なお、濾過処理は０．０４２ｍ3／ｍ2
・ｈの低流量濾過とし、浸漬槽１内の水位を一定に保つ
ように、膜浸漬槽１内に被処理水７の導入を行った。濾
過処理は、２５分間の濾過、５分間の逆洗を１サイクル
とし、これを繰り返すことにより実施した。逆洗の間は
吸引を停止し、中空糸膜モジュール３の下方に設置した
散気管５からエアーバブリングを行い、中空糸膜モジュ
ール３の膜面の洗浄を行った。逆洗時のエアー量は４ｍ
3／ｈで行い、中空糸膜モジュール３の中空糸膜全体に
エアーバブルが当たるようにバブリングを行った。吸引
開始から２４時間後に得られた処理水のヒ素（Ｖ）の濃
度は、４μｇ／リットルであり、濁度は０であった。Example 2 Using the water treatment apparatus shown in FIG.
Water treatment. 1 m capacity for the membrane immersion tank 1 ThreeNomo
The hollow fiber membrane module 3 was arranged therein.
As the hollow fiber membrane module 3, ethylene-vinyl alcohol
Polyethylene porous with coal copolymer on the surface
Hollow fiber membranes (average pore diameter 0.1 μm) are arranged in a sheet
The two ends of the hollow fiber open in separate collecting pipes.
Flat hollow fiber membrane module fixed with resin
Stellapore L manufactured by Yyon Co., Ltd.) was used. This hollow fiber
Effective membrane area of membrane module is 8mTwoMet. This hollow
When one fiber membrane module is used, the longitudinal direction of the hollow fiber membrane is horizontal.
And the sheet surface of the hollow fiber membrane is perpendicular to the liquid surface
In the membrane immersion tank 1. And membrane immersion
In tank 1, arsenic (V) concentration 50 μg / liter, turbidity 2
5 times of water 7 to be treated is introduced, and the hollow fiber membrane module 3 is
After being immersed in the water to be treated, the water 7 (1 m
Three), 300 g of the adsorbent 8 prepared in Example 1 is added.
Air from the diffuser 5Three/ H flow rate
The inside of the membrane immersion tank 1 is agitated by continuous aeration
The adsorbent 8 was dispersed in the water 7 to be treated. Of adsorbent 8
The suction by the suction pump 4 was started simultaneously with the introduction. Suction
The pump 4 communicates with the water collection pipe of the hollow fiber membrane module 3,
Thereby, the secondary side of the hollow fiber membrane module 3 is suctioned and filtered.
Overprocessing was performed. The filtration process is 0.042mThree/ MTwo
・ Low flow filtration of h, keeping the water level in the immersion tank 1 constant
As described above, the water 7 to be treated was introduced into the membrane immersion tank 1. Filtration
Excess treatment is filtration for 25 minutes, backwash for 5 minutes, 1 cycle
This was repeated and carried out. During the backwash
The suction was stopped, and the module was placed below the hollow fiber membrane module 3.
Air bubbling is performed from the air diffuser 5 and the hollow fiber membrane module is
The surface of the film 3 was washed. Air volume during backwash is 4m
Three/ H, the entire hollow fiber membrane of the hollow fiber membrane module 3
Bubbling was performed so that an air bubble might hit. Suction
Arsenic (V) concentration of treated water obtained 24 hours after the start
The degree was 4 μg / liter and the turbidity was 0.

【００２０】[0020]

【発明の効果】以上説明したように、水処理工程で発生
する汚泥からなる本発明の吸着剤は、ヒ素化合物を含む
水から効率良くヒ素化合物を吸着することができ、各種
のヒ素化合物を含有する水の処理に利用することができ
る。また本発明の吸着剤は、各種水処理過程で発生する
汚泥を原料とするため、安価に製造することができる。
さらに浄水場等で発生した汚泥の再利用を行うことによ
り、発生する汚泥の処分量を減量化できる。特に、各浄
水場では日々発生する汚泥の処理が大量であることが問
題となっており、汚泥の再利用化が要望されているの
で、本発明のような汚泥の吸着剤としての利用は付加価
値が高いと言える。本発明の水処理方法は、ヒ素を含む
被処理水を汚泥からなる吸着剤に接触させることによ
り、被処理水中のヒ素化合物を除去することができるの
で、複雑な操作や装置を必要とせず、低コストで効率良
く水処理を行うことができる。またヒ素を含む被処理水
を、汚泥からなる吸着剤に接触させる吸着工程と、膜分
離手段に被処理水を通過させる濾過工程とを連続して行
うことができ、このようにすれば、被処理水中の濁質及
びヒ素化合物がともに除去された水質の高い、安全な処
理水を効率良く、しかも低コストで得ることができる。As described above, the adsorbent of the present invention comprising sludge generated in the water treatment step can efficiently adsorb arsenic compounds from water containing arsenic compounds and contains various arsenic compounds. It can be used for water treatment. Further, the adsorbent of the present invention can be manufactured at low cost because sludge generated in various water treatment processes is used as a raw material.
Furthermore, the amount of sludge generated can be reduced by reusing sludge generated in water purification plants and the like. In particular, at each water purification plant, there is a problem that the amount of sludge generated daily is large, and there is a demand for the reuse of sludge. Therefore, the use of sludge as an adsorbent as in the present invention is added. It can be said that the value is high. The water treatment method of the present invention can remove arsenic compounds in the water to be treated by contacting the water to be treated containing arsenic with an adsorbent made of sludge, so that complicated operations and devices are not required, Water treatment can be performed efficiently at low cost. In addition, the adsorption step of bringing the water to be treated containing arsenic into contact with the adsorbent composed of sludge and the filtration step of passing the water to be treated through the membrane separation means can be performed continuously. It is possible to efficiently and at low cost obtain high-quality, safe treated water from which both turbidity and arsenic compounds in the treated water have been removed.

【図面の簡単な説明】[Brief description of the drawings]

【図１】本発明の第１の実施形態で好適に用いられる装
置の例を示した概略構成図である。FIG. 1 is a schematic configuration diagram showing an example of an apparatus suitably used in a first embodiment of the present invention.

【図２】本発明の第２の実施形態で好適に用いられる装
置の例を示した概略構成図である。FIG. 2 is a schematic configuration diagram showing an example of an apparatus suitably used in a second embodiment of the present invention.

【符号の説明】[Explanation of symbols]

１…膜浸漬槽、３…膜モジュール（膜分離手段）、７…
被処理水、８…吸着剤、１１…加圧缶体、１２…吸着
塔。DESCRIPTION OF SYMBOLS 1 ... Membrane immersion tank, 3 ... Membrane module (membrane separation means), 7 ...
Water to be treated, 8: adsorbent, 11: pressurized can, 12: adsorption tower.

───────────────────────────────────────────────────── フロントページの続き (72)発明者 亘 謙治 愛知県名古屋市東区砂田橋四丁目１番60号 三菱レイヨン株式会社商品開発研究所内 (72)発明者 渡辺 義公 北海道札幌市豊平区西岡５条11丁目12番８ 号 (72)発明者 小澤 源三 北海道札幌市北区北33条西12丁目３番23号 Ｆターム(参考） 4D006 GA02 HA01 HA02 HA19 HA93 KA02 KA13 KA43 KA71 KB12 KB30 KC03 KD09 KD30 KE01P KE05Q KE07P KE08P KE12P KE21Q KE24Q KE28Q MA01 MA22 MC03 MC11 MC22X MC28 MC33 MC33X MC39 MC62 PA01 PB04 PB05 PB08 PB22 PB23 PB24 PB70 4D017 AA01 BA11 CA04 CA12 CB01 DA07 4D024 AB17 BA13 BC04 CA01 DB05 4G066 AA11B AA20B AA75B CA46 DA08 FA37  ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kenji Watari 4-160 Sunadabashi, Higashi-ku, Nagoya City, Aichi Prefecture Inside Mitsubishi Rayon Co., Ltd. Product Development Laboratory (72) Inventor Yoshiko Watanabe 5-11, Nishioka, Toyohira-ku, Sapporo, Hokkaido Chome 12-8 (72) Inventor Genzo Ozawa 12-3-3 Kita 33 Nishi, Kita-ku, Sapporo-shi, Hokkaido F-term (reference) 4D006 GA02 HA01 HA02 HA19 HA93 KA02 KA13 KA43 KA71 KB12 KB30 KC03 KD09 KD30 KE01P KE05Q KE07P KE08P KE12P KE21Q KE24Q KE28Q MA01 MA22 MC03 MC11 MC22X MC28 MC33 MC33 MC33 MC37 MC62 PA01 PB04 PB05 PB08 PB22 PB23 PB24 PB70 4D017 AA01 BA11 CA04 CA12 CB01 DA07 4D024 AB17 BA13 ABCAA DBA

Claims (13)

【特許請求の範囲】[Claims] 【請求項１】ヒ素含有量が５０ｐｐｂ以下の原水を浄水
処理する工程で発生した汚泥からなり、水分含有量が２
５．０〜９９．９重量％であることを特徴とする吸着
剤。The sludge produced in the step of purifying raw water having an arsenic content of 50 ppb or less has a water content of 2%.
An adsorbent characterized by being 5.0 to 99.9% by weight. 【請求項２】ヒ素含有量が１０ｐｐｂ以下の原水を浄水
処理する工程で発生した汚泥からなることを特徴とする
請求項１記載の吸着剤。2. The adsorbent according to claim 1, comprising sludge generated in a step of purifying raw water having an arsenic content of 10 ppb or less. 【請求項３】吸着剤に含まれる固形分中のアルミニウム
含有量が５〜４５重量％であることを特徴とする請求項
１記載の吸着剤。3. The adsorbent according to claim 1, wherein the aluminum content in the solid content contained in the adsorbent is 5 to 45% by weight. 【請求項４】前記汚泥が、河川水あるいは湖沼水の浄水
処理工程で発生した汚泥であることを特徴とする請求項
１記載の吸着剤。4. The adsorbent according to claim 1, wherein said sludge is sludge generated in a water purification process of river water or lake water. 【請求項５】ヒ素を含む被処理水を、請求項１ないし４
のいずれかに記載の吸着剤に接触させる吸着工程を有す
ることを特徴とする水処理方法。5. The water to be treated containing arsenic is claimed in claim 1 to claim 4.
A water treatment method, comprising an adsorption step of bringing into contact with the adsorbent according to any one of the above. 【請求項６】前記吸着工程において、前記被処理水中に
前記吸着剤を分散させることを特徴とする請求項５記載
の水処理方法。6. The water treatment method according to claim 5, wherein in the adsorption step, the adsorbent is dispersed in the water to be treated. 【請求項７】前記吸着工程において、前記吸着剤を充填
した吸着塔に前記被処理水を通水することを特徴とする
請求項５記載の水処理方法。7. The water treatment method according to claim 5, wherein, in the adsorption step, the water to be treated is passed through an adsorption tower filled with the adsorbent. 【請求項８】ヒ素を含む被処理水を、請求項１ないし４
のいずれかに記載の吸着剤に接触させる吸着工程と、膜
分離手段で濾過する濾過工程とを有することを特徴とす
る水処理方法。8. The water to be treated containing arsenic is claimed in claims 1 to 4.
A water treatment method, comprising: an adsorption step of bringing the adsorbent into contact with the adsorbent according to any one of the above, and a filtration step of performing filtration by a membrane separation means. 【請求項９】前記濾過工程において、前記膜分離手段を
前記被処理水中に浸漬させて、前記膜分離手段の二次側
を吸引することを特徴とする請求項８記載の水処理方
法。9. The water treatment method according to claim 8, wherein in the filtration step, the membrane separation means is immersed in the water to be treated, and the secondary side of the membrane separation means is sucked. 【請求項１０】前記濾過工程において、前記膜分離手段
を前記被処理水中に浸漬させて、前記膜分離手段の一次
側を加圧することを特徴とする請求項８記載の水処理方
法。10. The water treatment method according to claim 8, wherein in the filtration step, the membrane separation means is immersed in the water to be treated, and a primary side of the membrane separation means is pressurized. 【請求項１１】前記吸着工程において、前記吸着剤を充
填した吸着塔に前記被処理水を通水することを特徴とす
る請求項８ないし１０のいずれかに記載の水処理方法。11. The water treatment method according to claim 8, wherein, in the adsorption step, the water to be treated is passed through an adsorption tower filled with the adsorbent. 【請求項１２】前記吸着剤を分散させた前記被処理水中
に前記膜分離手段を浸漬させることを特徴とする請求項
８ないし１０のいずれかに記載の水処理方法。12. The water treatment method according to claim 8, wherein the membrane separation means is immersed in the water to be treated in which the adsorbent is dispersed. 【請求項１３】前記膜分離手段として多孔質中空糸膜モ
ジュールを用いることを特徴とする請求項８ないし１２
のいずれかに記載の水処理方法。13. The method according to claim 8, wherein a porous hollow fiber membrane module is used as said membrane separation means.
The water treatment method according to any one of the above.
JP33686099A 1999-11-26 1999-11-26 Adsorbent and water treatment method using the same Pending JP2001149926A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP33686099A JP2001149926A (en) 1999-11-26 1999-11-26 Adsorbent and water treatment method using the same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP33686099A JP2001149926A (en) 1999-11-26 1999-11-26 Adsorbent and water treatment method using the same

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Publication Number Publication Date
JP2001149926A true JP2001149926A (en) 2001-06-05
JP2001149926A5 JP2001149926A5 (en) 2006-12-28

Family

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Family Applications (1)

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Country Link
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003019404A (en) * 2001-07-06 2003-01-21 Mitsubishi Rayon Co Ltd Arsenic adsorbent and removal treatment method for arsenic using the same
WO2004033374A1 (en) * 2002-10-08 2004-04-22 Kemira Oyj Method and medium for the removal of heavy metals from aqueous solutions
CN113600146A (en) * 2021-07-26 2021-11-05 武汉大学 Iron-manganese composite membrane adsorbent, preparation method thereof and application thereof in adsorbing arsenic and cadmium in water and soil

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003019404A (en) * 2001-07-06 2003-01-21 Mitsubishi Rayon Co Ltd Arsenic adsorbent and removal treatment method for arsenic using the same
WO2004033374A1 (en) * 2002-10-08 2004-04-22 Kemira Oyj Method and medium for the removal of heavy metals from aqueous solutions
CN113600146A (en) * 2021-07-26 2021-11-05 武汉大学 Iron-manganese composite membrane adsorbent, preparation method thereof and application thereof in adsorbing arsenic and cadmium in water and soil
CN113600146B (en) * 2021-07-26 2022-07-29 武汉大学 Iron-manganese composite membrane adsorbent, preparation method thereof and application thereof in adsorbing arsenic and cadmium in water and soil

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