JP2005246125A - Neutralization treatment method of acidic waste water - Google Patents

Neutralization treatment method of acidic waste water Download PDF

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Publication number
JP2005246125A
JP2005246125A JP2004056125A JP2004056125A JP2005246125A JP 2005246125 A JP2005246125 A JP 2005246125A JP 2004056125 A JP2004056125 A JP 2004056125A JP 2004056125 A JP2004056125 A JP 2004056125A JP 2005246125 A JP2005246125 A JP 2005246125A
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Prior art keywords
concrete
waste water
acidic
water
wastewater
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JP2004056125A
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Japanese (ja)
Inventor
Naoki Maeda
直己 前田
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Maeta Concrete Industry Ltd
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Maeta Concrete Industry Ltd
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Priority to JP2004056125A priority Critical patent/JP2005246125A/en
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  • Treatment Of Water By Oxidation Or Reduction (AREA)
  • Treatment Of Sludge (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a neutralization treatment method of acidic waste water in which concrete sludge water discharged attendant upon production of concrete and production of ready-mixed concrete or the like is effectively utilized as a neutralizer of the acidic waste water by utilizing strong alkalinity thereof. <P>SOLUTION: To the acidic waste water 3 such as mine waste water and factory waste water, the concrete sludge water 1 discharged attendant upon production of concrete in a concrete product factory or washing of a ready-mixed concrete mixer car or the like or dewatered cakes 2 obtained therefrom is charged. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は酸性排水の中和処理方法に関し、詳しくは、鉱山排水や工場などから排出され
る酸性排水を、産業廃棄物であるコンクリートスラッジ水により中和する酸性排水の中和
処理方法に関する。 The present invention relates to a method for neutralizing acidic wastewater, and more particularly to a method for neutralizing acidic wastewater that neutralizes acidic wastewater discharged from mine wastewater or a factory with concrete sludge water that is industrial waste.

鉱山排水や工場などから排出される産業排水は酸性であるとゝもに、生態系に対して有
害な重金属が含まれていることが多い。このような鉱山排水や産業廃液をそのまま河川や
海などに排出すると環境汚染をもたらすため、従来は、水酸化カルシウム塩や炭酸カルシ
ウム塩などの中和剤を用いて中和したのちに放流する方法が主として行われてていた。し
かし、このような処理方法においては、間断なく流下する鉱山排水や工場排水にあっては
中和剤の使用量が膨大となり、比較的安価な炭酸カルシウム塩を使用する場合でも経費が
嵩むといった問題点がある。 Industrial wastewater discharged from mines and factories is acidic, but often contains heavy metals that are harmful to the ecosystem. Since discharging such mine drainage and industrial wastewater directly into rivers and seas causes environmental pollution, the conventional method of discharging after neutralizing with a neutralizing agent such as calcium hydroxide salt or calcium carbonate salt Was mainly done. However, in such a treatment method, there is a problem that the amount of the neutralizing agent used is enormous in the mine drainage and factory wastewater that flows down without interruption, and the cost is increased even when a relatively inexpensive calcium carbonate salt is used. There is a point.

一方、コンクリート製品工場や生コンクリート製造工場からは産業廃棄物であるコンク
リートスラッジ水が多量に発生する。そこで、このコンクリートスラッジ水を有効利用す
るため、従来はコンクリートスラッジ水の発生直後にフィルタープレス機等の脱水機で脱
水した後、この脱水ケーキを乾燥と粉砕工程を経て粉粒体を形成し、これを土木工事現場
で軟弱地盤の泥土に混入したりする再利用方法や、前記脱水処理で発生するスラッジ水は
セメントの練り水や設備の洗浄水として循環再利用することが行われている。 On the other hand, concrete sludge water, which is industrial waste, is generated in large quantities from concrete product factories and ready-mixed concrete manufacturing factories. Therefore, in order to effectively use this concrete sludge water, conventionally, after dewatering with a dehydrator such as a filter press machine immediately after the generation of the concrete sludge water, this dehydrated cake is dried and pulverized to form granules, A reuse method in which this is mixed into mud soil of soft ground at a civil engineering construction site, and sludge water generated by the dehydration treatment is recycled and reused as cement kneading water or facility washing water.

しかし、上記のような再利用だけでは、大量に発生するコンクリートスラッジ水との関
係で処分量としては不十分であり、大半は自然乾燥や脱水処理などにより含水率を下げ、
その後に管理型産業廃棄物として埋め立て処理されている。このように、コンクリートス
ラッジ水を脱水することによりその減量化を図ることはできるが、廃棄処分をすることに
変わりはない。したがって、処理費用の準備や処分地の確保という問題が残されていると
ゝもに、上記のような従来の再利用以外にコンクリートスラッジ水を大量に使用できる技
術の開発が待たれていた。 However, the above-mentioned reuse alone is not enough for disposal due to the large amount of concrete sludge water generated, and most of the water content is reduced by natural drying or dehydration.
After that, it is landfilled as managed industrial waste. In this way, the concrete sludge water can be reduced in weight by dewatering, but it is still disposed of. Accordingly, while there are still problems of preparation of processing costs and securing of disposal sites, development of a technology capable of using a large amount of concrete sludge water in addition to the conventional reuse as described above has been awaited.

本発明は、上記のような従来の問題に鑑みてなされたもので、コンクリート製造および
生コンクリート製造等に伴って排出されるコンクリートスラッジ水の強アルカリ性を利用
し、これを酸性排水の中和剤として有効利用した酸性排水の中和処理方法を提供すること
を目的としたものである。 The present invention has been made in view of the above-described conventional problems, and utilizes the strong alkalinity of concrete sludge water discharged with concrete production and ready-mixed concrete production. It aims at providing the neutralization processing method of the acidic waste water utilized effectively as.

上記の目的を達成するため、本願の請求項１に係る発明は、鉱山排水や工場排水等の酸
性排水に、コンクリート製品工場や生コンクリートミキサー車の洗浄等に伴って排出され
るコンクリートスラッジ水又はその脱水ケーキを投入することを特徴とする酸性排水の中
和処理方法である。 In order to achieve the above object, the invention according to claim 1 of the present application is directed to acidic sludge water discharged from mine drainage, factory drainage, or other acidic wastewater along with washing of concrete product factories or ready-mixed mixer trucks. It is the neutralization processing method of the acidic waste water characterized by throwing in the dewatering cake.

また、上記の目的を達成するため、本願の請求項２に係る発明は、Ｃａ化合物及び／又
はＭｇ化合物を併用することを特徴とする酸性排水の中和処理方法であり、更に、本願の
請求項３に係る発明は、前記中和処理に際し第一鉄塩を還元剤として添加することを特徴
とする酸性排水の中和処理方法である。 In order to achieve the above object, the invention according to claim 2 of the present application is a neutralization treatment method for acidic waste water characterized by using a Ca compound and / or a Mg compound in combination. The invention according to Item 3 is a neutralization treatment method for acidic waste water, wherein a ferrous salt is added as a reducing agent during the neutralization treatment.

本願の請求項１に係る発明によれば、コンクリート製品工場や生コンクリートミキサー
車の洗浄に伴って排出される産業廃棄物であるコンクリートスラッジ水を鉱山排水や工場
などから発生する酸性排水の中和剤として有効利用できる。したがって、産業廃棄物の減
量化を図ることができるとゝもに、処理費用や処分地の確保という問題が解決される。 According to the invention according to claim 1 of the present application, neutralization of acidic wastewater generated from mine drainage, factories, etc. with concrete sludge water, which is industrial waste discharged along with the washing of concrete product factories and ready-mixed concrete mixer trucks It can be used effectively as an agent. Therefore, it is possible to reduce the amount of industrial waste, while solving the problems of disposal costs and securing disposal sites.

また、本願の請求項２に係る発明によれば、Ｃａ化合物及び／又はＭｇ化合物を併用す
ることにより、酸性排水のＰＨ値が２未満の場合でも、少量のＣａ化合物，Ｍｇ化合物を
添加することで廉価に且つ確実に酸性排水の中和処理を行うことが出来る。 Moreover, according to the invention which concerns on Claim 2 of this application, even when the PH value of acidic waste water is less than 2, by adding together Ca compound and / or Mg compound, a small amount of Ca compound and Mg compound are added. Thus, it is possible to neutralize acidic wastewater at a low cost and with certainty.

更に、本願の請求項３に係る発明によれば、中和処理に際して第一鉄塩を還元剤として
添加することによって、コンクリートスラッジ水や酸性排水に含まれている有害な６価ク
ロムが３価クロムに還元されて無害となり、自然環境や河川の水質を汚染するといった二
次汚染が発生することがない。 Furthermore, according to the invention according to claim 3 of the present application, harmful hexavalent chromium contained in concrete sludge water or acidic drainage is trivalent by adding ferrous salt as a reducing agent in the neutralization treatment. It is reduced to chromium and rendered harmless, and secondary pollution such as polluting the natural environment and river water quality does not occur.

以下、本発明方法を図１に示すブロック図を参照して詳細に説明する。コンクリート製
造及び生コンクリート製造などに伴って排出されるコンクリートスラッジ水１はセメント
と微粒の砂を含む懸濁水であり、セメントに含まれる酸化カルシウム溶出の影響から強ア
ルカリ性（例えば、ＰＨ１２．１〜１２．８）を呈する溶液である。本発明では、このコ
ンクリートスラッジ水１をそのままの状態で、鉱山排水や工場などから排出される産業排
水（酸性排水）３に投入し、撹拌混合する。 Hereinafter, the method of the present invention will be described in detail with reference to the block diagram shown in FIG. Concrete sludge water 1 discharged along with concrete production and ready-mixed concrete production is suspension water containing cement and fine sand, and is strongly alkaline (for example, PH 12.1 to 12 due to the effect of calcium oxide dissolution in the cement. .8). In the present invention, the concrete sludge water 1 is introduced as it is into industrial wastewater (acid wastewater) 3 discharged from a mine drainage or a factory, and mixed with stirring.

ここで、前記コンクリートスラッジ水１はそのままの状態では現場までの搬送などにお
いて制約があり、取扱が容易でない場合もある。したがって、酸性排水の処理現場が遠隔
地にあるような場合には、コンクリートスラッジ水１の発生直後にフィルタープレス機等
の脱水機で脱水した後これを固化させた脱水ケーキ２とし、これを鉱山排水や工場排水等
の処理現場まで運搬し、酸性排水３に投入するのが簡便である。 Here, if the concrete sludge water 1 is left as it is, there is a restriction in transportation to the site and the handling may not be easy. Therefore, when the treatment site of acidic wastewater is in a remote place, immediately after the generation of the concrete sludge water 1, it is dehydrated with a dehydrator such as a filter press machine and then solidified, and this is dehydrated cake 2. It is easy to transport to the treatment site such as waste water and factory waste water and throw it into the acid waste water 3.

上記のように、コンクリートスラッジ水１をそのまま又はその脱水ケーキ２を投入する
ことで酸性排水３は中和されるが、鉱山排水や工場排水の酸性度が強く、コンクリートス
ラッジ水１だけでは中和処理できない場合もある。この様な場合には、コンクリートスラ
ッジ水１と併用して少量の消石灰，炭酸カルシウムなどのＣａ化合物４Ａや水酸化マグネ
シウム，炭酸マグネシウムなどのＭｇ化合物４Ｂを添加することで、廉価に且つ確実に酸
性排水の中和処理を行うことが出来る。 As described above, the acid wastewater 3 is neutralized by putting the concrete sludge water 1 as it is or by adding the dehydrated cake 2, but the acidity of the mine wastewater and factory wastewater is strong, and the concrete sludge water 1 alone is neutralized. In some cases, it cannot be processed. In such a case, a small amount of Ca compound 4A such as slaked lime and calcium carbonate or Mg compound 4B such as magnesium hydroxide and magnesium carbonate is added in combination with the concrete sludge water 1, and it is inexpensive and reliably acidic. Neutralization of waste water can be performed.

しかし、コンクリートスラッジ水１や酸性排水には有毒物質である６価クロムが含まれ
ている場合もある。このような場合には中和処理した溶液に６価クロムがそのまま残留す
ることになり、二次汚染が発生することになるので、本発明では、中和処理に際して硫酸
第一鉄などの第一鉄塩５を還元剤として添加する。これにより、コンクリートスラッジ水
１や酸性排水３に含まれている有害な６価クロムが３価クロムに還元されて無害となり、
自然環境や河川の水質を汚染することがない。 However, the concrete sludge water 1 and the acidic drainage may contain hexavalent chromium which is a toxic substance. In such a case, hexavalent chromium remains in the neutralized solution as it is, and secondary contamination occurs. Therefore, in the present invention, in the neutralization treatment, ferrous sulfate or the like such as ferrous sulfate is used. Iron salt 5 is added as a reducing agent. As a result, harmful hexavalent chromium contained in the concrete sludge water 1 and acidic drainage 3 is reduced to trivalent chromium and becomes harmless.
It does not pollute the natural environment or river water quality.

本発明は上記のような構成であるから、コンクリート製造業，生コンクリート製造業で
は産業廃棄物の発生が減少する。また、鉱山や工場では発生する鉱山排水や工場排水を処
理するための中和剤の使用経費が大幅に削減されるとゝもに、河川への放流により環境を
破壊することもない。 Since the present invention is configured as described above, the generation of industrial waste is reduced in the concrete manufacturing industry and the ready-mixed concrete manufacturing industry. In addition, if the cost of using the neutralizing agent for treating mine drainage and factory wastewater generated in mines and factories is significantly reduced, the environment will not be destroyed by being discharged into rivers.

本発明に係る酸性排水の中和処理方法を示すブロック図である。It is a block diagram which shows the neutralization processing method of the acidic waste_water | drain which concerns on this invention.

符号の説明Explanation of symbols

１ コンクリートスラッジ水
２ 脱水ケーキ
３ 酸性排水
４Ａ Ｃａ化合物
４Ｂ Ｍｇ化合物
５ 第一鉄塩 1 Concrete sludge water 2 Dehydrated cake 3 Acidic drainage 4A Ca compound 4B Mg compound 5 Ferrous salt

Claims (3)

鉱山排水や工場排水等の酸性排水に、コンクリート製品工場や生コンクリートミキサー車の洗浄等に伴って排出されるコンクリートスラッジ水又はその脱水ケーキを投入することを特徴とする酸性排水の中和処理方法。   A method for neutralizing acidic wastewater, characterized in that concrete sludge water discharged from a concrete product factory or a ready-mixed concrete mixer truck or its dewatered cake is added to acidic wastewater such as mine wastewater or factory wastewater. . Ｃａ化合物及び／又はＭｇ化合物を併用することを特徴とする請求項１記載の酸性排水の中和処理方法。   The method for neutralizing acidic waste water according to claim 1, wherein a Ca compound and / or a Mg compound are used in combination. 前記中和処理に際し第一鉄塩を還元剤として添加することを特徴とする請求項１又は２記載の酸性排水の中和処理方法。   The method for neutralizing acidic waste water according to claim 1 or 2, wherein a ferrous salt is added as a reducing agent in the neutralization treatment.
JP2004056125A 2004-03-01 2004-03-01 Neutralization treatment method of acidic waste water Pending JP2005246125A (en)

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100890297B1 (en) 2007-06-15 2009-03-26 세명대학교 산학협력단 Neutralization system of acid mind drainage by porous concrete blocks with refilling of alkali material
JP2012024763A (en) * 2011-09-30 2012-02-09 Kajima Corp Reduction treatment method for chromium derived from cement type turbid water
CN104045181A (en) * 2014-05-08 2014-09-17 昆明有色冶金设计研究院股份公司 Waste acid treatment system and method
JP2015150497A (en) * 2014-02-14 2015-08-24 日本コンクリート工業株式会社 Neutralizer and production method thereof
JP2016002501A (en) * 2014-06-16 2016-01-12 株式会社システック Device for treating wastewater discharged from concrete or cement structure
JP2019056078A (en) * 2017-09-22 2019-04-11 日本コンクリート工業株式会社 Insolubilization material for soil and method for producing the same
JP7117809B1 (en) 2022-03-22 2022-08-15 環境創研株式会社 Method for producing treated concrete sludge

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4872965A (en) * 1971-12-29 1973-10-02
JPS54102051A (en) * 1978-01-26 1979-08-11 Shinetsu Eng Co Ltd Method of making additive agent for neutralizing acid waste water

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4872965A (en) * 1971-12-29 1973-10-02
JPS54102051A (en) * 1978-01-26 1979-08-11 Shinetsu Eng Co Ltd Method of making additive agent for neutralizing acid waste water

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100890297B1 (en) 2007-06-15 2009-03-26 세명대학교 산학협력단 Neutralization system of acid mind drainage by porous concrete blocks with refilling of alkali material
JP2012024763A (en) * 2011-09-30 2012-02-09 Kajima Corp Reduction treatment method for chromium derived from cement type turbid water
JP2015150497A (en) * 2014-02-14 2015-08-24 日本コンクリート工業株式会社 Neutralizer and production method thereof
CN104045181A (en) * 2014-05-08 2014-09-17 昆明有色冶金设计研究院股份公司 Waste acid treatment system and method
CN104045181B (en) * 2014-05-08 2016-01-20 昆明有色冶金设计研究院股份公司 A kind of dirty acid treatment system and method
JP2016002501A (en) * 2014-06-16 2016-01-12 株式会社システック Device for treating wastewater discharged from concrete or cement structure
JP2019056078A (en) * 2017-09-22 2019-04-11 日本コンクリート工業株式会社 Insolubilization material for soil and method for producing the same
JP7117809B1 (en) 2022-03-22 2022-08-15 環境創研株式会社 Method for producing treated concrete sludge
JP2023140099A (en) * 2022-03-22 2023-10-04 環境創研株式会社 Manufacturing method of concrete sludge processed product

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