JP2007313480A - Method and apparatus for reducing volume of silica-containing waste liquid - Google Patents

Method and apparatus for reducing volume of silica-containing waste liquid Download PDF

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JP2007313480A
JP2007313480A JP2006148289A JP2006148289A JP2007313480A JP 2007313480 A JP2007313480 A JP 2007313480A JP 2006148289 A JP2006148289 A JP 2006148289A JP 2006148289 A JP2006148289 A JP 2006148289A JP 2007313480 A JP2007313480 A JP 2007313480A
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silica
waste liquid
containing waste
membrane
liquid
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Takaaki Onishi
高明 大西
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Raito Kogyo Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for reducing the volume of a silica-containing waste liquid which can treat the waste liquid in a short period of time and does not need a wide space even when used for continuous treatment. <P>SOLUTION: After a silica-containing waste liquid is subjected to neutralization treatment, then subjected to membrane separation with a UF membrane having a molecular weight cut-off of 10,000 to 200,000. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、シリカ含有廃液の減容化方法及び装置に関するものである。より詳しくは、シリカ含有廃液が、例えば、水ガラス系注入材を地盤に注入した際に発生する注入管洗水や、水ガラス系注入材の製造工程において発生する廃液など、である場合に関するものである。   The present invention relates to a method and an apparatus for reducing the volume of silica-containing waste liquid. More specifically, the silica-containing waste liquid is, for example, an injection pipe washing water generated when a water glass-based injection material is injected into the ground, or a waste liquid generated in the manufacturing process of a water glass-based injection material. It is.

水ガラス系注入材を地盤に注入した際に発生する洗水は、シリカを含有する。したがって、河川などにそのまま放流することはできず、産業廃棄物として処分することになる。しかしながら、シリカを含有する廃液の処分代は高いため、そのままの状態で処分に出すと、注入工法自体のコスト高につながってしまう。そこで、シリカ含有廃液を減容化してから処分に出すことが望まれる。
この減容化の方法としては、例えば、シリカ含有廃液に水酸化アルカリ及び凝集剤を添加してシリカをいったん溶解した後、酸を添加してシリカ化合物を凝集させ、この凝集物を沈殿させて、減容化を図る方法がある（例えば、特許文献１参照。）。
しかしながら、この方法によると、凝集したシリカ化合物が沈殿するのを待たなければならないため、処理時間が長くなる。また、この方法によると、シリカ含有廃液を、連続的に減容化する場合は、複数の沈殿槽を設け、この複数の沈殿槽を順に利用することになるため、この複数の沈殿槽を設けるための、広いスペースが必要になる。
特開２００２−１０２８６１号公報 The washing water generated when the water glass injection material is injected into the ground contains silica. Therefore, it cannot be discharged as it is into a river or the like and is disposed as industrial waste. However, since the disposal cost of the waste liquid containing silica is high, if it is disposed as it is, the cost of the injection method itself will be increased. Therefore, it is desirable to reduce the volume of the silica-containing waste liquid before disposal.
As a method for volume reduction, for example, an alkali hydroxide and a flocculant are added to a silica-containing waste liquid to dissolve the silica once, and then an acid is added to agglomerate the silica compound to precipitate the agglomerate. There is a method for reducing the volume (for example, see Patent Document 1).
However, according to this method, it is necessary to wait for the agglomerated silica compound to precipitate, so that the processing time becomes long. In addition, according to this method, when continuously reducing the volume of silica-containing waste liquid, a plurality of precipitation tanks are provided, and the plurality of precipitation tanks are used in order. Therefore, a large space is required.
JP 2002-102861 A

本発明が解決しようとする主たる課題は、処理時間が短く、また、連続処理する場合にも、広いスペースが必要にならない、シリカ含有廃液の減容化方法及び装置を提供することにある。   The main problem to be solved by the present invention is to provide a method and an apparatus for reducing the volume of silica-containing waste liquid, which requires a short processing time and does not require a large space even in continuous processing.

この課題を解決した本発明は、次のとおりである。
〔請求項１記載の発明〕
シリカ含有廃液を中和処理した後、分画分子量１００００〜２０００００のＵＦ膜で、膜分離する、ことを特徴とする、シリカ含有廃液の減容化方法。 The present invention that has solved this problem is as follows.
[Invention of Claim 1]
A method for reducing the volume of a silica-containing waste liquid, comprising neutralizing the silica-containing waste liquid and then performing membrane separation with a UF membrane having a molecular weight cut-off of 10,000 to 200,000.

〔請求項２記載の発明〕
シリカ含有廃液の中和手段と、
分画分子量１００００〜２０００００のＵＦ膜が備わる膜分離手段と、
前記中和手段で得られた中和液を、前記膜分離手段に送る送液手段と、
を有する、ことを特徴とする、シリカ含有廃液の減容化装置。 [Invention of Claim 2]
Means for neutralizing silica-containing waste liquid;
A membrane separation means provided with a UF membrane having a molecular weight cut-off of 10,000 to 200,000,
A liquid feeding means for sending the neutralized liquid obtained by the neutralization means to the membrane separation means;
An apparatus for reducing the volume of a silica-containing waste liquid, comprising:

本発明によると、処理時間が短く、また、連続処理する場合にも、広いスペースが必要にならないものとなる。   According to the present invention, the processing time is short, and a large space is not required even when continuous processing is performed.

以下、本発明の実施の形態を説明する。
〔シリカ含有廃液〕
本発明が対象とするシリカ含有廃液は、シリカを含有する液であれば足り、それがいかなる原因で発生したものであるかは、限定されない。例えば、水ガラス系注入材を地盤に注入した際に発生する洗水や、水ガラスに酸を添加して得た酸性シリカゾルの脱塩処理に際して発生した廃液（通常、脱塩に際しては、シリカが若干リークしてしまうため、この処理に際して発生した廃液は、塩のほか、シリカを含有することになる。）などを例示することができる。 Embodiments of the present invention will be described below.
[Silica-containing waste liquid]
The silica-containing waste liquid targeted by the present invention is sufficient if it is a liquid containing silica, and there is no limitation on what causes it. For example, washing water generated when water glass injection material is injected into the ground, and waste liquid generated during desalting treatment of acid silica sol obtained by adding acid to water glass (usually, when desalting, silica is Since the liquid is slightly leaked, the waste liquid generated during this treatment contains silica in addition to the salt.

〔減容化方法・装置〕
本形態においては、図１に示すように、まず、シリカ含有廃液を、貯槽１及び撹拌翼２が備わる中和手段に送り、処理液と混合して、中和処理する。この中和のための処理液としては、シリカ含有廃液が、酸性の場合は、例えば、苛性ソーダ等のアルカリ性成分を、シリカ含有廃液が、アルカリ性の場合は、例えば、塩酸や硫酸等の酸性成分を、例示することができる。この中和処理によって、安定（アルカリ性）又は準安定（酸性）状態にあったシリカ含有廃液が、非安定状態となり、浮遊物質濃度（ＳＳ）が高くなる。 [Volume reduction method and equipment]
In this embodiment, as shown in FIG. 1, first, the silica-containing waste liquid is sent to a neutralization means provided with a storage tank 1 and a stirring blade 2, mixed with the treatment liquid, and neutralized. As the treatment liquid for neutralization, when the silica-containing waste liquid is acidic, for example, an alkaline component such as caustic soda is used. When the silica-containing waste liquid is alkaline, for example, an acidic component such as hydrochloric acid or sulfuric acid is used. Can be exemplified. By this neutralization treatment, the silica-containing waste liquid in a stable (alkaline) or metastable (acidic) state becomes an unstable state, and the suspended solid concentration (SS) increases.

以上の中和処理によって得られた中和液Ｇは、管などからなる送液手段５によって、膜分離手段に送る。この膜分離手段は、中和液Ｇを受け入れる処理槽３と、この処理槽３からの液を膜分離する膜分離装置４と、から主になる。この膜分離手段においては、膜分離装置４によって、シリカを含有しない液が、透過液として、分離除去されるので、中和液Ｇの容量が、減少（減容化）することになる。   The neutralized liquid G obtained by the above neutralization treatment is sent to the membrane separation means by the liquid sending means 5 composed of a tube or the like. This membrane separation means mainly comprises a treatment tank 3 that receives the neutralized liquid G and a membrane separation device 4 that separates the liquid from the treatment tank 3 into a membrane. In this membrane separation means, the membrane-separating device 4 separates and removes the liquid not containing silica as a permeate, so that the capacity of the neutralizing solution G is reduced (reduced volume).

本発明において、膜分離手段による中和液Ｇの処理方法は、特に限定されない。図１の上段に示すように、回分方式とすることも、図１の中段に示すように、半回分方式とすることも、図１の下段に示すように、連続方式とすることもできる。いずれの方法も、シリカの沈殿を待つというような消極的な処理を必要としないため、処理時間を短いものとすることができる。ただし、シリカ含有廃液を、連続的に減容化する場合は、複数の膜分離手段を設ける必要のない、半回分方式又は連続方式とするのが好ましい。これらによると、広いスペースが必要にならないためである。   In the present invention, the method for treating the neutralization solution G by the membrane separation means is not particularly limited. As shown in the upper part of FIG. 1, a batch method can be used, a semi-batch method can be used as shown in the middle part of FIG. 1, or a continuous method can be used as shown in the lower part of FIG. Any of the methods does not require a passive treatment such as waiting for the precipitation of silica, so that the treatment time can be shortened. However, when the volume of silica-containing waste liquid is continuously reduced, it is preferable to use a semi-batch method or a continuous method that does not require a plurality of membrane separation means. This is because a large space is not required.

本形態において、膜分離装置４の膜は、分画分子量１００００〜２０００００のＵＦ膜を、使用する。分画分子量が１００００未満であると、多大な分離圧力が必要になる。他方、分画分子量が２０００００超であると、膜の目詰まりが生じやすくなる。   In this embodiment, the membrane of the membrane separation device 4 uses a UF membrane having a molecular weight cut-off of 10,000 to 200,000. When the molecular weight cut off is less than 10,000, a great separation pressure is required. On the other hand, when the molecular weight cut off is more than 200,000, the film is likely to be clogged.

ただし、膜分離装置４の膜の構造、性能などは、特に限定されない。例えば、スパイラル膜、キャピラリー膜、チューブラー膜、カートリッジ膜、平膜などを使用することができる。また、中和液Ｇの流れと膜面との接触方向も、特に限定されない。例えば、膜面に垂直に液を流す全量ろ過方式とすることも、膜面と平行に液を流し液の流れの側方でろ過を行うクロスフローろ過方式とすることもできる。   However, the structure and performance of the membrane of the membrane separation device 4 are not particularly limited. For example, a spiral membrane, a capillary membrane, a tubular membrane, a cartridge membrane, a flat membrane, etc. can be used. Further, the contact direction between the flow of the neutralizing liquid G and the film surface is not particularly limited. For example, it is possible to adopt a total filtration method in which a liquid flows perpendicularly to the membrane surface, or a cross flow filtration method in which a liquid is allowed to flow in parallel with the membrane surface and filtration is performed on the side of the liquid flow.

以上のＵＦ膜としては、疎水性が強い膜を使用するのが好ましい。疎水性が強い膜によると、シリカや微生物などの親水性物質による汚れが少なくなる。疎水性が強い膜としては、例えば、ＰＶＤＦ製のＵＦ膜等を例示することができる。   It is preferable to use a highly hydrophobic membrane as the above UF membrane. A highly hydrophobic membrane reduces contamination by hydrophilic substances such as silica and microorganisms. Examples of highly hydrophobic membranes include PVDF UF membranes.

本発明者らは、３号水ガラスに硫酸を添加して得た酸性シリカゾルを、電気透析装置によって、脱塩処理に際した際に発生した廃液を対象として、試験を行った。廃液は、シリカ含有量：１０００ｐｐｍ、ｐＨ：約２．０、硫酸ナトリウム濃度：飽和付近、ＳＳ：０ｐｐｍであった。本試験では、この廃液に、苛性ソーダ（ＮａＯＨ）を添加して、ｐＨ７に中和処理した。この中和処理によって得られた中和液は、ＳＳ：３００〜５００ｐｐｍであった。   The inventors of the present invention tested an acidic silica sol obtained by adding sulfuric acid to No. 3 water glass with an electrodialyzer as a target for waste liquid generated when desalting was performed. The waste liquid had silica content: 1000 ppm, pH: about 2.0, sodium sulfate concentration: near saturation, and SS: 0 ppm. In this test, caustic soda (NaOH) was added to this waste liquid and neutralized to pH 7. The neutralization liquid obtained by this neutralization treatment was SS: 300-500 ppm.

本試験では、この中和液を、分画分子量１０００００のＵＦ膜で膜分離（チューブラー膜、クロスフローろ過方式）した。この膜分離により、ｐＨ：７、ＳＳ：０ｐｐｍの透過液と、ｐＨ：７の高粘度液体（減容化液）と、に分離された。減容化液の容量は、廃液の１０〜２０％になっており、大きく減容化されることが分かった。なお、透過液は、ｐＨ：７の非安定領域にあるにも関らず、ＳＳ：０ｐｐｍであることから、シリカを含まないことが分かる。   In this test, this neutralized solution was subjected to membrane separation (tubular membrane, cross-flow filtration method) with a UF membrane having a fractional molecular weight of 100,000. By this membrane separation, it was separated into a permeate having a pH of 7 and SS of 0 ppm and a high-viscosity liquid having a pH of 7 (volume reducing liquid). The volume of the volume reducing liquid was 10 to 20% of the waste liquid, and it was found that the volume was greatly reduced. In addition, although a permeation | transmission liquid exists in the unstable region of pH: 7, since SS is 0 ppm, it turns out that it does not contain a silica.

本発明は、水ガラス系注入材を地盤に注入した際に発生する洗水や、水ガラスに酸を添加して得た酸性シリカゾルの脱塩処理に際して発生した廃液などの、シリカを含有する廃液の減容化に適用可能である。   The present invention is a waste liquid containing silica, such as washing water generated when water glass-based injecting material is injected into the ground, and waste liquid generated during desalting treatment of acidic silica sol obtained by adding acid to water glass. It is applicable to volume reduction.

減容化の処理フロー図である。It is a processing flow figure of volume reduction.

符号の説明Explanation of symbols

１…貯槽、２…撹拌翼、３…処理槽、４…膜分離装置、５…送液手段、Ｇ…中和液。   DESCRIPTION OF SYMBOLS 1 ... Storage tank, 2 ... Stirring blade, 3 ... Processing tank, 4 ... Membrane separation apparatus, 5 ... Liquid feeding means, G ... Neutralization liquid.

Claims (2)

シリカ含有廃液を中和処理した後、分画分子量１００００〜２０００００のＵＦ膜で、膜分離する、ことを特徴とする、シリカ含有廃液の減容化方法。   A method for reducing the volume of a silica-containing waste liquid, comprising neutralizing the silica-containing waste liquid and then performing membrane separation with a UF membrane having a molecular weight cut-off of 10,000 to 200,000. シリカ含有廃液の中和手段と、
分画分子量１００００〜２０００００のＵＦ膜が備わる膜分離手段と、
前記中和手段で得られた中和液を、前記膜分離手段に送る送液手段と、
を有する、ことを特徴とする、シリカ含有廃液の減容化装置。 Means for neutralizing silica-containing waste liquid;
A membrane separation means provided with a UF membrane having a molecular weight cut-off of 10,000 to 200,000,
A liquid feeding means for sending the neutralized liquid obtained by the neutralization means to the membrane separation means;
An apparatus for reducing the volume of a silica-containing waste liquid, comprising:
JP2006148289A 2006-05-29 2006-05-29 Method and apparatus for reducing volume of silica-containing waste liquid Pending JP2007313480A (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000070938A (en) * 1998-09-01 2000-03-07 Hitachi Plant Eng & Constr Co Ltd Treatment of waste liquid
JP2001170656A (en) * 1999-11-03 2001-06-26 L'air Liquide Process for removing solid particulate, more particularly silica and/or alumina particulate from waste water
JP2003300070A (en) * 2002-04-09 2003-10-21 Ngk Insulators Ltd Treatment method of metal-based cmp waste water

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000070938A (en) * 1998-09-01 2000-03-07 Hitachi Plant Eng & Constr Co Ltd Treatment of waste liquid
JP2001170656A (en) * 1999-11-03 2001-06-26 L'air Liquide Process for removing solid particulate, more particularly silica and/or alumina particulate from waste water
JP2003300070A (en) * 2002-04-09 2003-10-21 Ngk Insulators Ltd Treatment method of metal-based cmp waste water

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