JP2020163821A - Sludge water treatment recovery method - Google Patents
Sludge water treatment recovery method Download PDFInfo
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- JP2020163821A JP2020163821A JP2019069523A JP2019069523A JP2020163821A JP 2020163821 A JP2020163821 A JP 2020163821A JP 2019069523 A JP2019069523 A JP 2019069523A JP 2019069523 A JP2019069523 A JP 2019069523A JP 2020163821 A JP2020163821 A JP 2020163821A
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- sludge water
- water
- carbon dioxide
- sludge
- concrete
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 68
- 239000010802 sludge Substances 0.000 title claims abstract description 52
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000011084 recovery Methods 0.000 title abstract description 6
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 46
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 23
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 23
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims abstract description 18
- 239000004568 cement Substances 0.000 claims abstract description 10
- 229910000019 calcium carbonate Inorganic materials 0.000 claims abstract description 9
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical group [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims abstract description 6
- 239000000920 calcium hydroxide Substances 0.000 claims abstract description 6
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims abstract description 6
- 239000000378 calcium silicate Substances 0.000 claims abstract description 6
- 229910052918 calcium silicate Inorganic materials 0.000 claims abstract description 6
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 claims abstract description 6
- 238000010304 firing Methods 0.000 claims abstract description 4
- 230000036571 hydration Effects 0.000 claims description 13
- 238000006703 hydration reaction Methods 0.000 claims description 13
- 238000006243 chemical reaction Methods 0.000 abstract description 2
- 239000000047 product Substances 0.000 description 11
- 239000007787 solid Substances 0.000 description 8
- 238000004898 kneading Methods 0.000 description 6
- 238000004140 cleaning Methods 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 239000006228 supernatant Substances 0.000 description 4
- 239000002351 wastewater Substances 0.000 description 4
- 230000005587 bubbling Effects 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 239000010419 fine particle Substances 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 239000003643 water by type Substances 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 238000007664 blowing Methods 0.000 description 1
- 229940043430 calcium compound Drugs 0.000 description 1
- 150000001674 calcium compounds Chemical class 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Abstract
Description
本発明は、レディーミクストコンクリート工場の運搬車やミキサ等の洗浄によって発生する洗浄排水から、骨材を除いた水を二酸化炭素で処理してスラッジ水を回収する方法に関する。 The present invention relates to a method for recovering sludge water by treating water excluding aggregate with carbon dioxide from cleaning wastewater generated by cleaning a transport vehicle or a mixer of a ready-mixed concrete factory.
レディーミクストコンクリート工場（生コン工場）の運搬車やミキサ等の洗浄によって発生する洗浄排水から、骨材を除いた水は回収水と呼ばれる。そして、該回収水は、水酸化カルシウムやカルシウムシリケート水和物等の水和生成物を含む上澄水と、該水和生成物と骨材微粒子等のスラッジ固形分を含むスラッジ水に分けられる。そして、前記水和生成物と骨材微粒子が多いスラッジ水は、コンクリートの混練水に用いると、コンクリートの強度が低下する場合がある。 The water from which the aggregate is removed from the cleaning wastewater generated by cleaning the transport vehicle and mixer of the ready-mixed concrete factory (ready-mixed concrete factory) is called recovered water. Then, the recovered water is divided into supernatant water containing a hydration product such as calcium hydroxide and calcium silicate hydrate, and sludge water containing the hydration product and sludge solid content such as aggregate fine particles. When sludge water containing a large amount of the hydrated product and aggregate fine particles is used as kneading water for concrete, the strength of the concrete may decrease.
そこで、日本コンクリート工学協会の回収水利用委員会は、回収水の使用に関し、以下の提言をしている。
(i）上澄水は、上水と同様に練混水として使用できる。
(ii）水セメント比やコンシステンシーを一定にするためには、スラッジ固形分率１％につき、単位水量や単位セメント量を１〜１．５％増やす。
(iii）細骨材率はスラッジ固形分１％につき約０．５％減らす。
(iv）コンクリート中の空気量が減少傾向にあるため、ＡＥ剤や空気量調整剤を用いて空気量を調整する。
このように、スラッジ水中の固形分は、その含有量によってはコンクリートの混練水に使えないため、固形分の多いスラッジ水は廃棄せざるを得ないが、アルカリ性が高いため廃棄のための処理に手間やコストがかかっていた。
Therefore, the Reclaimed Water Utilization Committee of the Japan Concrete Institute has made the following recommendations regarding the use of reclaimed water.
(i) The supernatant water can be used as a kneading water in the same manner as the clean water.
(ii) In order to keep the water-cement ratio and consistency constant, increase the unit water amount and unit cement amount by 1 to 1.5% for every 1% of sludge solid content.
(iii) The fine aggregate ratio is reduced by about 0.5% per 1% of sludge solid content.
(iv) Since the amount of air in concrete tends to decrease, adjust the amount of air using an AE agent or an air amount adjusting agent.
In this way, the solid content in sludge water cannot be used as kneading water for concrete depending on its content, so sludge water with a high solid content must be discarded, but because it is highly alkaline, it can be used for disposal. It was troublesome and costly.
そこで、スラッジ水や回収水を処理する方法がいくつか提案されている。例えば、
引用文献１では、コンクリート回収水を加熱する加熱工程と、加熱工程にて加熱されたコンクリート回収水を静置することにより、上澄水を分離する分離工程とを実施する上澄水の分離回収方法が提案されている。
引用文献２では、生コンクリートの混練設備や残存した生コンクリートの処理工程から排出されるセメントを含んだスラッジ水を脱水機によって処理する方法において、前記スラッジを電解処理することによって、スラッジ水に含まれる混和剤の形態を変える電解工程を経て脱水機へ送られる、生コンクリートスラッジ水の脱水処理方法が提案されている。
引用文献３では、セメントが水に分散しているスラッジ水に、分離剤を添加して撹拌し、セメントが水和活性を有しない部分と、未だ水和活性を有する部分とに分離し、未だ水和活性を有する部分を再使用する、セメント排水の分離方法が提案されている。
しかし、これらの方法は、処理や分離後のスラッジ水の処理や分離に手間がかかる。
Therefore, some methods for treating sludge water and recovered water have been proposed. For example
In Cited Document 1, a method for separating and recovering supernatant water, which comprises a heating step of heating the concrete recovery water and a separation step of separating the supernatant water by allowing the concrete recovery water heated in the heating step to stand still. Proposed.
In Reference 2, in a method of treating sludge water containing cement discharged from a kneading facility for ready-mixed concrete or a treatment step for remaining ready-mixed concrete by a dehydrator, the sludge is contained in the sludge water by electrolytic treatment. A method for dehydrating ready-mixed sludge water, which is sent to a dehydrator through an electrolysis process that changes the form of the admixture, has been proposed.
In Cited Document 3, a separating agent is added to sludge water in which cement is dispersed in water, and the mixture is stirred to separate the cement into a portion having no hydration activity and a portion still having hydration activity. A method for separating cement wastewater has been proposed, in which the portion having hydration activity is reused.
However, these methods require time and effort to treat and separate sludge water after treatment and separation.
そこで、本発明は、コンクリートの強度に影響しないスラッジ水の処理回収方法を提供することを目的とする。 Therefore, an object of the present invention is to provide a method for treating and recovering sludge water that does not affect the strength of concrete.
本発明者は、前記課題を解決するために鋭意検討した結果、スラッジ水を二酸化炭素で処理して回収する方法は前記目的を達成できることを見出し、本発明を完成した。すなわち、本発明は、以下の構成を有するスラッジ水の処理回収方法である。 As a result of diligent studies to solve the above problems, the present inventor has found that a method for treating sludge water with carbon dioxide and recovering it can achieve the above object, and has completed the present invention. That is, the present invention is a method for treating and recovering sludge water having the following constitution.
［１］スラッジ水に二酸化炭素を吹き込んで、スラッジ水中の水和生成物と反応処理して炭酸カルシウムを生成させてスラッジ水を回収する、スラッジ水の処理回収方法。
［２］前記二酸化炭素が、セメントクリンカの焼成時に生成する二酸化炭素を含む排ガスである、前記［１］に記載のスラッジ水の処理回収方法。
［３］前記水和生成物が水酸化カルシウム、およびカルシウムシリケート水和物である、前記［１］または［２］に記載のスラッジ水の処理回収方法。
[1] A method for treating and recovering sludge water, in which carbon dioxide is blown into sludge water and reacted with a hydration product in the sludge water to generate calcium carbonate to recover the sludge water.
[2] The method for treating and recovering sludge water according to the above [1], wherein the carbon dioxide is an exhaust gas containing carbon dioxide generated during firing of cement clinker.
[3] The method for treating and recovering sludge water according to the above [1] or [2], wherein the hydration product is calcium hydroxide and calcium silicate hydrate.
本発明のスラッジ水の処理回収方法によれは、コンクリートの強度に影響しないスラッジ水を得ることができ、スラッジ水の有効活用に資することができる。 According to the sludge water treatment and recovery method of the present invention, sludge water that does not affect the strength of concrete can be obtained, which can contribute to effective utilization of sludge water.
本発明は、前記のとおり、スラッジ水に二酸化炭素を吹き込んで、スラッジ水中の水和生成物と反応処理して炭酸カルシウムを生成させてスラッジ水を回収する、スラッジ水の処理回収方法等である。
以下、本発明について詳細に説明する。
１．スラッジ水
本発明の処理対象であるスラッジ水は、レディーミクストコンクリート工場の運搬車やミキサ等の洗浄によって発生する洗浄排水から、骨材を除いた水であって、該回収水は、水酸化カルシウムやカルシウムシリケート水和物等の水和生成物と、骨材微粒子等のスラッジ固形分を含む水である。
As described above, the present invention is a method for treating and recovering sludge water, in which carbon dioxide is blown into sludge water and reacted with a hydration product in sludge water to generate calcium carbonate to recover sludge water. ..
Hereinafter, the present invention will be described in detail.
1. 1. Sludge water The sludge water to be treated in the present invention is water obtained by removing aggregates from the washing wastewater generated by washing the transport vehicle and mixer of a ready-mixed concrete factory, and the recovered water is calcium hydroxide. Water containing hydration products such as calcium silicate hydrate and sludge solids such as aggregate fine particles.
２．二酸化炭素
本発明で用いる二酸化炭素は、工業品としての二酸化炭素、空気、およびセメントクリンカの焼成時に生成する二酸化炭素や窒素酸化物を含む排ガスが挙げられる。これらの中でも、前記排ガスは、二酸化炭素等の大気中への放出抑制と有効活用に資するため好ましい。
二酸化炭素の吹き込み方法は、単なるバブリングのほか、撹拌しながらバブリングする方法、および、超音波を照射しながらバブリングする方法が挙げられる。
2. Carbon dioxide Examples of carbon dioxide used in the present invention include carbon dioxide as industrial products, air, and exhaust gas containing carbon dioxide and nitrogen oxides generated during firing of cement clinker. Among these, the exhaust gas is preferable because it contributes to the suppression and effective utilization of carbon dioxide and the like into the atmosphere.
Examples of the method of blowing carbon dioxide include a method of bubbling while stirring and a method of bubbling while irradiating ultrasonic waves, in addition to simple bubbling.
３．水和生成物
本発明で二酸化炭素と反応する水和生成物は、主に、水酸化カルシウムとカルシウムシリケート水和物である。これらのカルシウム化合物と二酸化炭素が反応すると、スラッジ水のｐＨは１２以下に低下するため、スラッジ水の取り扱いが、より容易になるほか、環境への影響を軽減することができる。
3. 3. Hydrate products The hydration products that react with carbon dioxide in the present invention are mainly calcium hydroxide and calcium silicate hydrate. When these calcium compounds react with carbon dioxide, the pH of the sludge water drops to 12 or less, so that the sludge water can be handled more easily and the impact on the environment can be reduced.
４．炭酸カルシウム
本発明において、二酸化炭素と水和生成物が反応して生成する炭酸カルシウムは微細であるため、混練水として再利用した場合、コンクリート中で微細なフィラーとして作用するため、コンクリートの強度の向上効果がある。この炭酸カルシウムの粒径は０．０１〜２０μｍが好ましい。
4. Calcium carbonate In the present invention, calcium carbonate produced by the reaction of carbon dioxide and hydration products is fine, so when reused as kneading water, it acts as a fine filler in concrete, so the strength of concrete Has an improving effect. The particle size of this calcium carbonate is preferably 0.01 to 20 μm.
以下、本発明を実施例により具体的に説明するが、本発明はこれらの実施例に限定されない。
１．使用材料と配合
表１にコンクリートに用いた材料を示し、表２にコンクリートの配合を示す。
Hereinafter, the present invention will be specifically described with reference to Examples, but the present invention is not limited to these Examples.
1. 1. Materials used and composition Table 1 shows the materials used for concrete, and Table 2 shows the composition of concrete.
２．試験と結果
スラッジ水Ａ、Ｂに液化炭酸ガスを注入し、炭酸カルシウムを生成した水を練混ぜ水として使用した。スラッジに含まれる固形分率、および、その中の炭酸カルシウムの割合を表２に示す。
また、圧縮強度をＪＩＳ Ａ １１０８「コンクリートの圧縮強度試験方法」に準拠して測定した。その結果を図１に示す。
スラッジ水Ａ、Ｂをそのまま使用した比較例２、３は、上水道水を用いた比較例1と、圧縮強度が同程度かやや低い。これに対し、炭酸ガスを注入したスラッジ水Ａ、Ｂを使用した実施例１、２は、いずれも比較例よりも圧縮強度が高い。
2. Tests and Results Liquefaction carbon dioxide was injected into sludge waters A and B, and water that produced calcium carbonate was used as kneading water. Table 2 shows the solid content ratio contained in the sludge and the ratio of calcium carbonate in the solid content.
The compressive strength was measured in accordance with JIS A 1108 “Concrete compressive strength test method”. The result is shown in FIG.
Comparative Examples 2 and 3 in which sludge waters A and B were used as they were had the same or slightly lower compression strength as Comparative Example 1 in which tap water was used. On the other hand, in Examples 1 and 2 using sludge waters A and B infused with carbon dioxide gas, the compressive strength is higher than that of the comparative example.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113842768A (en) * | 2021-11-17 | 2021-12-28 | 重庆市畜牧科学院 | Carbon dioxide treatment method |
| JP7227426B1 (en) * | 2022-11-04 | 2023-02-21 | 日本コンクリート工業株式会社 | moving body |
| JP7274031B1 (en) | 2022-09-09 | 2023-05-15 | 住友大阪セメント株式会社 | Carbon dioxide utilization system, calcium carbonate production apparatus and production method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113842768A (en) * | 2021-11-17 | 2021-12-28 | 重庆市畜牧科学院 | Carbon dioxide treatment method |
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| JP7227426B1 (en) * | 2022-11-04 | 2023-02-21 | 日本コンクリート工業株式会社 | moving body |
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