JP2000263064A - Boron fixation agent and method for treating boron- containing wastewater - Google Patents
Boron fixation agent and method for treating boron- containing wastewaterInfo
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- JP2000263064A JP2000263064A JP11077601A JP7760199A JP2000263064A JP 2000263064 A JP2000263064 A JP 2000263064A JP 11077601 A JP11077601 A JP 11077601A JP 7760199 A JP7760199 A JP 7760199A JP 2000263064 A JP2000263064 A JP 2000263064A
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- boron
- wastewater
- concentration
- agent
- fixing agent
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、ホウ素固定剤およ
びそれを用いたホウ素含有排水の処理方法に関するもの
であり、さらに詳しくは、効率的に排水中からホウ素を
除去することのできるホウ素固定剤およびホウ素含有排
水の処理方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a boron fixing agent and a method for treating boron-containing wastewater using the same, and more particularly, to a boron fixing agent capable of efficiently removing boron from wastewater. And a method for treating boron-containing wastewater.
【０００２】[0002]
【従来の技術】ホウ酸、ホウ酸ソーダに代表されるホウ
素化合物は、ガラス工業をはじめとして、ニッケルメッ
キ添加剤、防腐剤、染料、顔料、化粧品、石鹸、写真な
どの分野において広く用いられており、これらの製造工
程から生ずる排水中には、ホウ素化合物が含まれてく
る。このほか、原子力発電所から発生する放射性廃液、
排煙脱硫排水、ゴミ焼却場における洗煙排水等にもホウ
素化合物が含まれている。ホウ素は、植物にとって必須
の元素とされながらも、過剰の付与は、その成長を阻害
することが知られており、国内でも１〜２ｍｇ／ｌ以下
という極めて厳しい排水中許容濃度を条例により制定し
ているところもある。2. Description of the Related Art Boron compounds represented by boric acid and sodium borate are widely used in the glass industry, nickel plating additives, preservatives, dyes, pigments, cosmetics, soaps, photographs, and the like. In addition, wastewater generated from these manufacturing processes contains boron compounds. In addition, radioactive liquid waste generated from nuclear power plants,
Boron compounds are also contained in flue gas desulfurization effluent and smoke washing effluent in garbage incineration plants. Boron is an essential element for plants, but it is known that excessive addition inhibits its growth. In Japan, a very strict allowable concentration in wastewater of 1-2 mg / l or less has been established by ordinance. Some are.
【０００３】このようなホウ素含有排水を処理する方法
としては、硫酸アルミニウムや消石灰等により、不溶性
沈殿物として除去する方法（第１の方法）、アニオン交
換樹脂やホウ素選択性イオン交換樹脂により吸着させる
方法（第２の方法）、および逆浸透膜により処理する方
法（第３の方法）等が知られている。[0003] As a method for treating such boron-containing wastewater, a method of removing it as an insoluble precipitate with aluminum sulfate or slaked lime (first method), or adsorption by an anion exchange resin or a boron-selective ion exchange resin. A method (second method) and a method of treating with a reverse osmosis membrane (third method) are known.
【０００４】しかし、これらの方法のうち、第１の方法
においては、ホウ素の除去効率が低いため、強いて処理
液中のホウ素濃度を低く抑えるためには、硫酸アルミニ
ウム等の凝集剤の添加量を増加させる必要があり、大量
のスラッジが発生するという問題があった。また、第２
の方法においては、樹脂を再生して使用する場合、その
再生廃液の処理が困難であるという問題があった。さら
に、第３の方法においては、一般に使用されている逆浸
透膜では、ホウ素化合物に対する除去率が５０〜６０％
と低いので、排水規制値以下に処理するには多段の装置
を必要とし、イニシャルコストが過大になる等の問題点
があった。However, in the first of these methods, the efficiency of removing boron is low, so that the amount of a coagulant, such as aluminum sulfate, must be added to reduce the boron concentration in the processing solution. It has to be increased, and there is a problem that a large amount of sludge is generated. Also, the second
In the method (1), when the resin is regenerated and used, there is a problem that it is difficult to treat the regenerated waste liquid. Further, in the third method, a generally used reverse osmosis membrane has a removal rate of 50 to 60% for a boron compound.
Therefore, there are problems that multi-stage equipment is required to process the wastewater below the wastewater regulation value, and the initial cost becomes excessive.
【０００５】[0005]
【発明が解決しようとする課題】これらの問題に対処す
る方法として、凝集沈殿法と陰イオン交換樹脂またはホ
ウ素選択性イオン交換樹脂によるホウ素除去を組み合わ
せた方法が提案されている（特開昭５７−８１８１８号
公報参照）。しかし、この方法においても、初段の凝集
沈殿法での除去効率が低いため、後段の吸着樹脂への負
荷が高くなり、廃液の処理量が十分ではないという問題
点があり、また、樹脂からの再生廃液を処理する際に凝
集沈殿法を用いた場合にも、凝集沈殿の除去効率が低い
ため、高濃度の処理水を樹脂塔へ戻す必要性があり、設
備が大きくなる等の問題が残っており、何れの方法にお
いても凝集沈殿法でのホウ素の除去効率を高める必要が
あった。As a method for addressing these problems, there has been proposed a method in which a coagulation precipitation method is combined with boron removal using an anion exchange resin or a boron-selective ion exchange resin (Japanese Patent Application Laid-Open No. 57-15757). -81818). However, even in this method, since the removal efficiency in the first-stage coagulation-sedimentation method is low, the load on the subsequent-stage adsorption resin is increased, and there is a problem that the throughput of the waste liquid is not sufficient. Even when the coagulation sedimentation method is used when treating the reclaimed waste liquid, the efficiency of removing the coagulation sediment is low, so it is necessary to return high-concentration treated water to the resin tower. In any of these methods, it is necessary to increase the efficiency of removing boron by the coagulation sedimentation method.
【０００６】さらに、低濃度のホウ素排水を希土類元素
の含水酸化物を用いることによって処理する方法も提案
されているが（特公平３−２２２３８号公報参照）、含
水酸化物という水不溶性の固体を用いているため、処理
効率が悪く、ホウ素を低濃度まで処理するには大量添加
または長時間の反応（撹拌）が必要であるという問題が
あった。Further, a method of treating low-concentration boron wastewater by using a hydrated oxide of a rare earth element has also been proposed (see Japanese Patent Publication No. 3-22238), but a water-insoluble solid called a hydrated oxide is removed. Since it is used, the treatment efficiency is poor, and there is a problem that a large amount of addition or a long-time reaction (stirring) is required to treat boron to a low concentration.
【０００７】本発明は、ホウ素含有排水からホウ素を効
率よく除去することができ、さらに、スラッジの発生量
を減少させることのできるホウ素固定剤およびホウ素含
有排水の処理方法を提供することを目的とするものであ
る。An object of the present invention is to provide a boron fixing agent capable of efficiently removing boron from boron-containing wastewater and reducing the amount of sludge generated, and a method for treating boron-containing wastewater. Is what you do.
【０００８】[0008]
【課題を解決するための手段】本発明者らは、このよう
な課題を解決するために鋭意検討した結果、希土類元素
の特定の化合物が高濃度のホウ素排水から効率よくホウ
素を除去することができ、しかも得られるスラッジも濾
布離れが良好であるなど取扱いが容易にできることを見
出し、本発明に到達した。Means for Solving the Problems The inventors of the present invention have made intensive studies to solve such problems, and as a result, it has been found that a specific compound of a rare earth element can efficiently remove boron from high-concentration boron wastewater. The present inventors have found that the sludge obtained can be easily handled, for example, that the sludge obtained from the filter cloth is well separated, and the present invention has been achieved.
【０００９】すなわち、本発明の第一は、ランタン化合
物からなることを特徴とするホウ素固定剤を要旨とする
ものである。また、本発明の第二は、ホウ素含有排水を
濃縮した後、濃縮液に本発明の第一のホウ素固定剤を添
加して不溶性沈殿物を生成させ、次いで生成した不溶性
沈殿物を固液分離することを特徴とするホウ素含有排水
の処理方法を要旨とするものである。That is, the first aspect of the present invention is to provide a boron fixing agent comprising a lanthanum compound. In the second aspect of the present invention, after concentrating the boron-containing wastewater, the first boron fixing agent of the present invention is added to the concentrated solution to generate an insoluble precipitate, and then the generated insoluble precipitate is subjected to solid-liquid separation. The gist of the present invention is a method for treating boron-containing wastewater.
【００１０】[0010]
【発明の実施の形態】以下、本発明を詳細に説明する。
本発明のホウ素固定剤は、ランタン化合物からなるもの
である。ランタン化合物としては、塩化物、硝酸塩、硫
酸塩、炭酸塩、酢酸塩などの形態があげられ、これらは
単独で用いても良いし、２種以上を混合して用いてもよ
い。BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail.
The boron fixing agent of the present invention comprises a lanthanum compound. Examples of the lanthanum compound include chlorides, nitrates, sulfates, carbonates, acetates and the like, and these may be used alone or as a mixture of two or more.
【００１１】ホウ素固定剤でのランタン化合物の含有量
としては、２０重量％以上が好ましく、２８重量％以上
がより好ましい。本発明のホウ素固定剤の形状として
は、液体または水溶液等の液状、粉末状、フレーク状、
スラリー状等があげられるが、使用する際の容易さから
液状が好ましく、また固体状の場合には使用前に水に溶
解して水溶液とすることが好ましい。The content of the lanthanum compound in the boron fixing agent is preferably at least 20% by weight, more preferably at least 28% by weight. As the shape of the boron fixing agent of the present invention, a liquid such as a liquid or an aqueous solution, a powder, a flake,
Slurry and the like can be mentioned, but a liquid is preferable in terms of ease of use, and in a case of a solid, it is preferable to dissolve in water before use to make an aqueous solution.
【００１２】本発明のホウ素固定剤は、上記したランタ
ン化合物以外にその他の物質が含まれていても構わな
い。そのような物質としては、希土類元素およびＩＶｂ
元素である、スカンジウム、イットリウム、セリウム、
プラセオジウム、ネオジウム、プロメチウム、サマリウ
ム、ユウロピウム、ガドリニユム、テリビウム、ジスプ
ロシウム、ホルミウム、エルビウム、ツリウム、イッテ
ルビウム、ルテチウム、チタン、ジルコニウム、ハフニ
ウムを含む化合物等が挙げられる。The boron fixing agent of the present invention may contain other substances in addition to the above-mentioned lanthanum compound. Such materials include rare earth elements and IVb
The elements scandium, yttrium, cerium,
Compounds containing praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, titanium, zirconium, hafnium, and the like.
【００１３】次に、本発明のホウ素含有排水の処理方法
について説明する。本発明で対象とするホウ素含有排水
としては、前述の種々の工程から排出される排水を対象
とする。それらの排水がＳＳおよび重金属等を含んでい
る場合には、それらを除去するために、必要に応じて凝
集沈殿等により除去することが望ましい。Next, the method for treating boron-containing wastewater of the present invention will be described. As the boron-containing wastewater targeted in the present invention, wastewater discharged from the above-mentioned various processes is targeted. When the wastewater contains SS, heavy metal, and the like, it is desirable to remove the wastewater by coagulation and sedimentation as necessary in order to remove them.
【００１４】本発明においては、必要に応じて凝集沈殿
等でＳＳや重金属等が除去されたホウ素含有排水を濃縮
することが必要である。ホウ素含有排水を濃縮する方法
としては、陰イオン交換樹脂を用いて濃縮する方法など
が挙げられる。ここで用いられる陰イオン交換樹脂とし
ては、例えば、通常の状態で固体の水不溶性の有機ポリ
マーから形成されたマトリックス樹脂を母体とし、水溶
液からイオン交換を司るに十分なカチオン交換基を有す
るものなどが例示される。この場合の具体例としては、
フェノール系、スチレン系、あるいはアクリル系のポリ
マーから形成された樹脂母体中に４級アンモニウム基を
交換基として持つ強塩基性陰イオン交換樹脂、あるいは
Ｎ−メチルグルカミン、複合アミノ基等のイオン交換基
を有するホウ素選択吸着イオン交換樹脂があげられる。
本発明ではこれらの陰イオン交換樹脂を用いることがで
きるが、ホウ素選択吸着イオン交換樹脂は、廃液中にホ
ウ素以外の塩素イオン又は硫酸イオン等の陰イオンが含
まれていても、ホウ素を選択的に吸着し、廃液の処理量
が通常の陰イオン交換樹脂に比べて多いことから特に好
ましい。In the present invention, it is necessary to concentrate the boron-containing waste water from which SS, heavy metals, and the like have been removed by coagulation sedimentation, if necessary. Examples of a method for concentrating the boron-containing wastewater include a method for concentrating the wastewater using an anion exchange resin. Examples of the anion exchange resin used here include, for example, those having a matrix resin formed from a solid, water-insoluble organic polymer in a normal state as a base and having a sufficient cation exchange group to control ion exchange from an aqueous solution. Is exemplified. As a specific example in this case,
Strongly basic anion exchange resin having a quaternary ammonium group as an exchange group in a resin matrix formed of a phenolic, styrene or acrylic polymer, or ion exchange of N-methylglucamine, complex amino group, etc. Boron-selective adsorption ion exchange resin having a group.
In the present invention, these anion exchange resins can be used.However, the boron selective adsorption ion exchange resin can selectively use boron even when the waste liquid contains an anion such as chloride ion or sulfate ion other than boron. It is particularly preferable because it is adsorbed on the resin and the throughput of the waste liquid is larger than that of a normal anion exchange resin.
【００１５】接触方法としては、カラム法、バッチ法の
いずれの方法でもよいが、カラム法で行った方が、ホウ
素に対する樹脂量が少量でよく、さらにホウ素を低濃度
まで処理することができるため好ましい。また、接触条
件としては、使用する樹脂の種類や排水中のホウ素濃度
によって左右されるため、適宜決定することが好まし
い。また、接触させるホウ素含有排水の量も使用する樹
脂の種類や排水中のホウ素濃度によって左右されるた
め、適宜決定することが好ましく、例えば、陰イオン交
換樹脂として、Ｎ−メチルグルカミンを官能基として有
するホウ素選択吸着イオン交換樹脂を用いて１０ｍｇ／
Ｌ程度のホウ素含有排水を処理する場合には、３００〜
５００Ｌ／Ｌ樹脂の排水を処理することができる。As the contact method, any of a column method and a batch method may be used. However, the column method is preferred because the amount of the resin with respect to boron can be small and the boron can be treated to a low concentration. preferable. In addition, since the contact condition depends on the type of the resin used and the boron concentration in the waste water, it is preferable to appropriately determine the contact condition. Further, since the amount of the boron-containing wastewater to be contacted also depends on the type of the resin to be used and the boron concentration in the wastewater, it is preferable to appropriately determine the amount. For example, as an anion exchange resin, N-methylglucamine is a functional group. 10mg / using a boron selective adsorption ion exchange resin having
When treating boron-containing wastewater of about L, 300 to
Wastewater of 500 L / L resin can be treated.
【００１６】その後、陰イオン交換樹脂に吸着したホウ
素は、鉱酸等の脱離剤を用いて再生しその脱離液を回収
することにより、ホウ素を高濃度に含有する濃縮液を得
ることができる。脱離の際に用いる鉱酸としては、特に
限定されるものではなく、例えば、陰イオン交換樹脂と
して、Ｎ−メチルグルカミンを官能基として有するホウ
素選択吸着イオン交換樹脂を用いた場合には、２Ｎの塩
酸を０．５Ｌ／Ｌ樹脂程度用いた後、イオン交換水を２
〜５Ｌ／Ｌ樹脂程度用いて洗浄することによってホウ素
を脱離させることができる。Thereafter, the boron adsorbed on the anion exchange resin is regenerated using a desorbing agent such as a mineral acid, and the desorbed liquid is recovered to obtain a concentrated liquid containing boron at a high concentration. it can. The mineral acid used in the elimination is not particularly limited.For example, when a boron selective adsorption ion exchange resin having N-methylglucamine as a functional group is used as an anion exchange resin, After using 2N hydrochloric acid at about 0.5 L / L resin, ion-exchanged water
Boron can be desorbed by washing with about 5 L / L resin.
【００１７】脱離液のホウ素濃度は、脱離初期は低く、
その後経時的に上昇し、後期は低下する。濃度が高い部
分を分割し、回収することで高濃度にホウ素を含有する
濃縮液を得ることができる。樹脂からの脱離液のホウ素
濃度は、１００ｍｇ／Ｌ以上に濃縮することが好まし
く、さらに５００ｍｇ／Ｌ以上が好ましく、１０００ｍ
ｇ／Ｌ以上の濃度であることが最も好ましい。これら高
濃度排水に本発明のホウ素固定剤を添加することによ
り、高いホウ素除去率が得られ、発生するスラッジ量も
低減することが可能となる。ホウ素濃度が低い部分は、
再度濃縮することが好ましい。The boron concentration of the desorption solution is low at the beginning of desorption,
Thereafter, it rises with time, and falls in the latter period. By dividing and collecting a portion having a high concentration, a concentrated solution containing boron at a high concentration can be obtained. The boron concentration of the desorbed solution from the resin is preferably concentrated to 100 mg / L or more, more preferably 500 mg / L or more, and 1000 m / L.
Most preferably, the concentration is at least g / L. By adding the boron fixing agent of the present invention to these high-concentration wastewaters, a high boron removal rate can be obtained, and the amount of generated sludge can be reduced. The part where the boron concentration is low is
It is preferred to concentrate again.
【００１８】濃縮液へのホウ素固定剤の添加量として
は、大量に添加するほど処理精度は良くなる傾向にある
が、当然スラッジの発生量も多くなるので、通常はホウ
素に対して０．０５〜１０当量添加するのが好ましく、
０．１〜２当量の範囲で添加するのが最適である。１０
当量を超える程大量に添加すると、固液分離した上澄水
処理水のホウ素濃度を基準以下にでき、その場合はその
まま放流することも可能であるが、スラッジが多量に発
生することから好ましくない。As to the amount of the boron fixing agent added to the concentrated solution, the treatment accuracy tends to be improved as the amount of the boron fixing agent is increased, but naturally the amount of sludge generated is also increased. It is preferable to add 10 to 10 equivalents,
Optimally, it is added in the range of 0.1 to 2 equivalents. 10
When added in a large amount exceeding the equivalent amount, the boron concentration of the treated supernatant water after solid-liquid separation can be reduced below the standard. In that case, it is possible to discharge the water as it is, but it is not preferable because a large amount of sludge is generated.
【００１９】ホウ素固定剤を添加しても、不溶性沈殿が
発生しない場合には、アルカリ剤等を添加してｐＨを２
〜１４、好ましくは５〜１２に調整して不溶性沈殿を生
成させることができる。また、陰イオン交換樹脂からの
脱離液には、強酸性の鉱酸を含んでいるので、予め排水
のｐＨを調整した後にホウ素固定剤を添加してもよい。
これらの際に用いるアルカリ剤としては、特に限定され
るものでなく、水酸化カルシウム、水酸化ナトリウム、
炭酸ナトリウム、炭酸カリウム、重炭酸ナトリウム、重
炭酸カリウム、アンモニウム等が用いられる。When no insoluble precipitates are generated even when the boron fixing agent is added, the pH is adjusted to 2 by adding an alkali agent or the like.
~ 14, preferably 5-12 to produce insoluble precipitates. Further, since the desorbed liquid from the anion exchange resin contains a strongly acidic mineral acid, the boron fixing agent may be added after the pH of the wastewater has been adjusted in advance.
The alkaline agent used in these cases is not particularly limited, and calcium hydroxide, sodium hydroxide,
Sodium carbonate, potassium carbonate, sodium bicarbonate, potassium bicarbonate, ammonium and the like are used.
【００２０】本発明の処理方法においては、本発明のホ
ウ素固定剤の他に凝集剤を補助的に用いることも可能で
ある。それらの凝集剤としては、アルミニウム化合物、
鉄化合物、亜鉛化合物等をあげることができるがこれに
限定されるものではない。In the treatment method of the present invention, a coagulant may be used in addition to the boron fixing agent of the present invention. Aluminum compounds,
Examples include iron compounds and zinc compounds, but are not limited thereto.
【００２１】ホウ素固定剤を添加して発生した不溶性沈
殿物は、次に固液分離して除去し、その上澄水は原水の
ホウ素含有排水に戻して処理するか、陰イオン交換樹脂
へ戻し再吸着させて再度処理を行うことができる。固液
分離の方法としては、特に限定されるものではなく、一
般に行われている方法で行えばよく、例えば、沈降分
離、浮上分離、濾過、遠心分離等があげられる。また、
これらの固液分離の際には、補助的に高分子凝集剤等を
併用できる。The insoluble precipitate generated by the addition of the boron fixing agent is then removed by solid-liquid separation, and the supernatant water is returned to the raw water containing boron to be treated or returned to the anion exchange resin. The treatment can be performed again after the adsorption. The method of solid-liquid separation is not particularly limited, and may be a generally used method, and examples thereof include sedimentation separation, flotation separation, filtration, and centrifugation. Also,
At the time of these solid-liquid separations, a polymer coagulant or the like can be used in combination.
【００２２】[0022]
【実施例】次に、本発明を実施例によって具体的に説明
する。 実施例１ ホウ素を５ｍｇ／Ｌの濃度で含有する排水をホウ素選択
吸着イオン交換樹脂ＵＲ−３５００（ユニチカ製）に吸
着させ、塩酸を用いて脱離した高濃度ホウ素含有排水
（ホウ素濃度：１２００ｍｇ／Ｌ）１，０００ｍＬを水
酸化ナトリウムでｐＨを１０に調整した。ホウ素固定剤
として、塩化ランタン水溶液（濃度：４３０ｇ／Ｌ、組
成（酸化物換算）：ランタン９９．９重量％、セリウム
０．０２重量％、ネオジム０．０１重量％を主成分とし
て含む）を用い、これを４０ｍＬ添加し、水酸化ナトリ
ウムでｐＨを９に調整して不溶性沈殿物を発生させた。
高分子凝集剤ＵＦ−１０５（ユニチカ製）を１２ｍｇ添
加、凝集し、濾紙（Ｎｏ．５Ｃ）により濾過後、濾過水
のホウ素濃度をＩＰＣ発光分析法で測定したところ、ホ
ウ素濃度は４６．２ｍｇ／Ｌであり、ホウ素除去率は９
６％であった。また、このときのスラッジ発生量は乾燥
重量で２３．３ｇであり、またこのスラッジは濾紙から
剥がれやすく取扱い易いものであった。Next, the present invention will be described specifically with reference to examples. Example 1 Wastewater containing boron at a concentration of 5 mg / L was adsorbed on a boron selective adsorption ion-exchange resin UR-3500 (manufactured by Unitika), and the high-concentration boron-containing wastewater desorbed using hydrochloric acid (boron concentration: 1200 mg / L) L) The pH of 1,000 mL was adjusted to 10 with sodium hydroxide. As a boron fixing agent, an aqueous lanthanum chloride solution (concentration: 430 g / L, composition (in terms of oxide): containing 99.9% by weight of lanthanum, 0.02% by weight of cerium, and 0.01% by weight of neodymium as main components) is used. Was added thereto, and the pH was adjusted to 9 with sodium hydroxide to generate an insoluble precipitate.
12 mg of a polymer flocculant UF-105 (manufactured by Unitika) was added and aggregated, and after filtration through filter paper (No. 5C), the boron concentration of the filtered water was measured by IPC emission spectrometry. L and the boron removal rate is 9
6%. The amount of sludge generated at this time was 23.3 g in terms of dry weight, and the sludge was easily peeled off from the filter paper and easily handled.
【００２３】比較例１ 実施例１と同様にしてホウ素選択吸着イオン交換樹脂か
ら再生した高濃度ホウ素含有再生排水（ホウ素濃度：１
２００ｍｇ／Ｌ）１，０００ｍＬを水酸化ナトリウム水
溶液でｐＨを７に調整した。ホウ素固定剤として、硫酸
アルミニウム水溶液（濃度：５２％）と消石灰水溶液
（濃度：２３％）を用い、各々１７０ｇと７２ｇを加え
て、水酸化ナトリウム水溶液でｐＨを１２に調整した。
高分子凝集剤ＵＦ−１０５（ユニチカ製）を３０ｍｇ添
加、凝集し、濾紙（Ｎｏ．５Ｃ）により濾過後、濾過水
のホウ素濃度をＩＣＰ発光分析法で測定したところ３５
０ｍｇ／Ｌであり、ホウ素除去率は７１％であった。こ
のときのスラッジ発生量は乾燥重量で５５．６ｇであっ
た。実施例１と比べ、ホウ素除去率が低く、スラッジ発
生量も２．４倍であった。Comparative Example 1 A high-concentration boron-containing regenerated wastewater (boron concentration: 1) regenerated from a boron selective adsorption ion exchange resin in the same manner as in Example 1.
(200 mg / L) 1,000 mL was adjusted to pH 7 with an aqueous sodium hydroxide solution. As a boron fixing agent, an aqueous solution of aluminum sulfate (concentration: 52%) and an aqueous solution of slaked lime (concentration: 23%) were used, 170 g and 72 g were added, and the pH was adjusted to 12 with an aqueous sodium hydroxide solution.
After adding 30 mg of a polymer flocculant UF-105 (manufactured by Unitika), coagulation was performed, and the mixture was filtered through filter paper (No. 5C). The boron concentration of the filtrate was measured by ICP emission spectrometry.
0 mg / L, and the boron removal rate was 71%. The amount of sludge generated at this time was 55.6 g by dry weight. Compared with Example 1, the boron removal rate was low, and the amount of sludge generated was 2.4 times.
【００２４】比較例２ ホウ素を２．３５ｍｇ／Ｌの濃度で含有する排水を濃縮
せずに、実施例１でホウ素固定剤として用いた塩化ラン
タン水溶液を０．２〜１０ｍＬ添加し、水酸化ナトリウ
ム水溶液でｐＨを９に調整して、不溶性沈殿物を発生さ
せた。高分子凝集剤ＵＦ−１０５（ユニチカ製）を２．
１〜４．２ｍｇ添加、凝集し、濾紙（Ｎｏ．５Ｃ）によ
り濾過後、濾過水のホウ素濃度をＩＣＰ発光分析法で測
定した。その結果を表１に示す。Comparative Example 2 0.2 to 10 mL of a lanthanum chloride aqueous solution used as a boron fixing agent in Example 1 was added without concentrating wastewater containing boron at a concentration of 2.35 mg / L, and sodium hydroxide was added. The pH was adjusted to 9 with an aqueous solution to generate an insoluble precipitate. 1. Polymer flocculant UF-105 (manufactured by Unitika)
After addition of 1 to 4.2 mg, aggregation, and filtration through filter paper (No. 5C), the boron concentration of the filtered water was measured by ICP emission spectrometry. Table 1 shows the results.
【００２５】[0025]
【表１】 [Table 1]
【００２６】ホウ素固定剤である塩化ランタン水溶液
０．２ｍＬの添加量は、実施例１のホウ素濃度１２００
ｍｇ／Ｌの排水への添加量に換算すると１０２ｍＬに相
当し、塩化ランタン水溶液の添加量１０ｍＬは５１００
ｍＬの添加量に相当する。ホウ素除去率７０％以上を達
成するために必要な塩化ランタン水溶液の添加量は、排
水を濃縮した実施例１に比べて１２０倍以上必要とな
り、このことからホウ素を濃縮し高濃度にすることでホ
ウ素固定剤の添加量を著しく低減できることがわかる。The addition amount of 0.2 mL of the aqueous lanthanum chloride solution as the boron fixing agent was the same as that of Example 1 except for the boron concentration of 1200 mL.
In terms of the amount added to wastewater of mg / L, it corresponds to 102 mL, and the added amount of lanthanum chloride aqueous solution of 10 mL is 5100
It corresponds to the amount of mL added. The addition amount of the lanthanum chloride aqueous solution required to achieve the boron removal rate of 70% or more is required to be 120 times or more as compared with Example 1 in which the wastewater is concentrated. It can be seen that the amount of the boron fixing agent can be significantly reduced.
【００２７】[0027]
【発明の効果】本発明によれば、ホウ素含有排水を基準
以下まで容易に処理することが可能であり、さらに添加
量が少量で済むためスラッジ発生量が低減でき、さらに
設備を小規模にすることができる。しかも、発生するス
ラッジは濾布離れが良好であるなど取扱いが容易とな
る。According to the present invention, it is possible to easily treat a boron-containing wastewater to a level lower than a standard, and furthermore, it is possible to reduce the amount of sludge generated because a small amount of addition is required, and to further reduce the size of the equipment. be able to. Moreover, the sludge generated is easy to handle, for example, the filter cloth is easily separated.
Claims (2)
るホウ素固定剤。1. A boron fixing agent comprising a lanthanum compound.
請求項１記載のホウ素固定剤を添加して不溶性沈殿物を
生成させ、次いで生成した不溶性沈殿物を固液分離する
ことを特徴とするホウ素含有排水の処理方法。2. After concentrating the boron-containing wastewater, the boron fixing agent according to claim 1 is added to the concentrated solution to form an insoluble precipitate, and then the formed insoluble precipitate is subjected to solid-liquid separation. Of wastewater containing boron.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP07760199A JP4393616B2 (en) | 1999-03-23 | 1999-03-23 | Boron fixing agent and treatment method of boron-containing waste water |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP07760199A JP4393616B2 (en) | 1999-03-23 | 1999-03-23 | Boron fixing agent and treatment method of boron-containing waste water |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000263064A true JP2000263064A (en) | 2000-09-26 |
| JP4393616B2 JP4393616B2 (en) | 2010-01-06 |
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ID=13638472
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| Application Number | Title | Priority Date | Filing Date |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001198581A (en) * | 2000-01-14 | 2001-07-24 | Kurita Water Ind Ltd | Method for treating boron-containing water |
| JP2006116389A (en) * | 2004-10-20 | 2006-05-11 | Miyoshi Oil & Fat Co Ltd | Fixing method for boron and fluorine and fixing agent composition |
-
1999
- 1999-03-23 JP JP07760199A patent/JP4393616B2/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001198581A (en) * | 2000-01-14 | 2001-07-24 | Kurita Water Ind Ltd | Method for treating boron-containing water |
| JP4665279B2 (en) * | 2000-01-14 | 2011-04-06 | 栗田工業株式会社 | Method for treating boron-containing water |
| JP2006116389A (en) * | 2004-10-20 | 2006-05-11 | Miyoshi Oil & Fat Co Ltd | Fixing method for boron and fluorine and fixing agent composition |
Also Published As
| Publication number | Publication date |
|---|---|
| JP4393616B2 (en) | 2010-01-06 |
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