JPH077101B2 - Cleaning wastewater treatment method for cement kneader - Google Patents
Cleaning wastewater treatment method for cement kneaderInfo
- Publication number
- JPH077101B2 JPH077101B2 JP63327306A JP32730688A JPH077101B2 JP H077101 B2 JPH077101 B2 JP H077101B2 JP 63327306 A JP63327306 A JP 63327306A JP 32730688 A JP32730688 A JP 32730688A JP H077101 B2 JPH077101 B2 JP H077101B2
- Authority
- JP
- Japan
- Prior art keywords
- cement
- sludge
- waste liquid
- kneader
- washing
- 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.)
- Expired - Lifetime
Links
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- Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、放射性廃棄物や重金属のような有害物質を含
有する廃液を、セメント固化により処理する場合の、セ
メント混練機の洗浄廃水の処理方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to treatment of washing wastewater of a cement kneader when treating waste liquid containing harmful substances such as radioactive waste and heavy metals by cement solidification. Regarding the method.
上記のような廃液のセメント固化処理法には、インドラ
ム方式、アウトドラム方式および真空方式がある。イン
ドラム方式の処理法は、ドラム缶の中で廃液とセメント
とを混練してそのまま固化する方法であり、アウトドラ
ム方式は、ある程度まとまった量の廃液とセメントを混
練機で均質に混練し、混練物をドラム缶に注入して固化
させる方法である。真空方式の処理法は、ドラム缶にセ
メントとバーミキュライトを詰め、その中へ廃液を真空
下で注入し、全体に浸透させて固化させる方法である。There are an in-drum system, an out-drum system, and a vacuum system as the above-described waste liquid cement solidification treatment method. The in-drum method is a method in which waste liquid and cement are kneaded in a drum can and then solidified as it is, and the out-drum method is a method in which a certain amount of waste liquid and cement are homogeneously kneaded in a kneader and then kneaded. It is a method of pouring a product into a drum and solidifying it. The vacuum treatment method is a method in which a drum can is filled with cement and vermiculite, and the waste liquid is injected into the drum under a vacuum so as to penetrate the whole and solidify.
しかし、真空方式の場合はできた固化体が十分に均質で
はなく、またインドラム方式は、セメント粉末の飛散
や、混練後に攪拌翼を洗浄しなければならないという問
題があり、アウトドラム方式の処理法が主流になってい
る。However, in the case of the vacuum method, the solidified product that is produced is not sufficiently homogeneous, and the in-drum method has the problems that the cement powder is scattered and the stirring blades must be washed after kneading, so the out-drum method Law has become mainstream.
アウトドラム方式の処理法においても、混練機に残った
スラッジは洗い流さなければならず、それにより生じた
洗浄廃水の処理が問題となる。現行の処理法では、洗浄
廃水をいったんタンクに送って静置し、分離した上澄水
は洗浄水として再利用し、下にたまったスラッジは真空
ポンプでタンクから引き抜いてドラム缶に排出し、そこ
で自然に凝固させる。Even in the outdrum type treatment method, the sludge remaining in the kneading machine must be washed away, and the treatment of the washing wastewater generated thereby becomes a problem. In the current treatment method, the washing wastewater is once sent to a tank and allowed to stand, the separated supernatant water is reused as washing water, and the sludge accumulated underneath is extracted from the tank by a vacuum pump and discharged into a drum, where it is discharged naturally. To solidify.
このようにして得られるスラッジ固化体は、均質なもの
ではなく、その圧縮強度も数kg/cm2〜数拾kg/cm2と、放
射性廃棄物の固化体に要求される海洋投棄基準の圧縮強
度150kg/cm2にはほど遠い。The sludge solidified product obtained in this way is not homogeneous, and its compressive strength is several kg / cm 2 to several kg / cm 2 , which means that the solidified solid of radioactive waste is compressed according to the standards of ocean dumping. Far from a strength of 150 kg / cm 2 .
本発明の目的は、廃液のセメント固化処理において、セ
メント混練機の洗浄廃水の処理方法を改良し、均質で十
分な強度をもった固化体を与えることにある。An object of the present invention is to improve a method for treating washing wastewater of a cement kneading machine in a cement solidification treatment of a waste liquid, and to provide a solidified body which is homogeneous and has sufficient strength.
本発明のセメント混練機の洗浄廃水処理方法は、廃液と
セメントとを混練機で混練し、その混合物を容器に注入
して固化させるセメント固化処理を行なうに際して、混
練機のスラッジを洗浄することにより生じた洗浄廃水を
洗浄廃水タンクに受けて、ゆるやかに攪拌しつつスラッ
ジが凝固しないように保存し、保存した洗浄廃水のスラ
ッジに富む部分を混練機に移送してセメントと混練し、
上澄水は上澄水タンクに送り、混練機の洗浄に再利用す
ることからなるセメント混練機の洗浄廃水処理すること
からなる。The method for cleaning wastewater of a cement kneading machine of the present invention, the waste liquid and cement are kneaded in a kneading machine, when performing a cement solidification treatment in which the mixture is poured into a container and solidified, by washing the sludge of the kneading machine. Receive the generated wash wastewater into the wash wastewater tank, store it with gentle stirring to prevent sludge from solidifying, transfer the sludge-rich portion of the stored wash wastewater to a kneader and knead it with cement,
The supernatant water is sent to a supernatant water tank and reused for cleaning the kneading machine to treat the waste water for cleaning the cement kneading machine.
洗浄廃水の攪拌、スラッジの沈降と凝固を妨げる程度に
弱く行なえば足り、そのような攪拌を続けると、底部寄
りにはスラッジに富むが固形物が懸濁している液があ
り、上部には上澄水が存在するようになる。そこで、前
者は次のセメント混練に際して混練機に送り、後者は洗
浄に再利用する。It is only necessary to stir the washing wastewater so weakly as to prevent sedimentation and solidification of the sludge. If such stirring is continued, there is a liquid rich in sludge near the bottom, but above the top. Clear water comes to exist. Therefore, the former is sent to the kneader at the time of the next cement kneading, and the latter is reused for washing.
本発明の処理方法を実施する装置は、代表的には図に示
すような構成となる。An apparatus for carrying out the processing method of the present invention is typically configured as shown in the figure.
廃液タンク（４）からの廃液とセメントホッパー（５）
からのセメントとは、混練機（１）において混合され、
混合物はドラム缶（９）へ注入されてそこで固化する。
混練作業が終ると、上澄水タンク（３）の中の水を混練
機に送って、混練機内を洗浄する。発生した洗浄廃水
は、洗浄廃水タンク（２）に送り、そこでは底部近くを
静かに攪拌する。Waste liquid from waste liquid tank (4) and cement hopper (5)
With the cement from (1) are mixed in the kneading machine (1),
The mixture is poured into a drum (9) where it solidifies.
When the kneading operation is completed, the water in the supernatant water tank (3) is sent to the kneading machine to wash the inside of the kneading machine. The generated cleaning waste water is sent to the cleaning waste water tank (2), where the vicinity of the bottom is gently stirred.
洗浄廃水に含まれているのは水和反応が進行しつつある
セメント粒子であって、これはタンク底部に向って沈降
し、静置しておくと水和物結晶の成長とからみ合いによ
りそこで凝固してしまうが、攪拌によりそれが妨げら
れ、各粒子が独立した状態で水和が進む。The washing wastewater contained cement particles that were undergoing a hydration reaction, which settled toward the bottom of the tank, and left to stand there due to the growth and entanglement of hydrate crystals. Although it solidifies, it is prevented by stirring, and hydration proceeds in the state where each particle is independent.
洗浄廃水タンクの上澄みは上澄水タンク（３）に送り、
上記した混練機（１）の洗浄に使用するほか、洗浄廃水
タンク（２）の洗浄や、混練機から洗浄廃水タンクへの
流路（６）の洗浄に使用する。The supernatant of the washing wastewater tank is sent to the supernatant water tank (3),
In addition to the above-mentioned washing of the kneading machine (1), it is used for washing the washing wastewater tank (2) and for washing the channel (6) from the kneading machine to the washing wastewater tank.
洗浄廃水タンク（２）の底部に保存されたスラッジは、
セメントとの混練の時期が来たとき、スラリー移送ポン
プ（７）により混練機（１）に送られ、前記したように
セメントと混練される。Sludge stored at the bottom of the wash wastewater tank (2)
When the time for kneading with cement comes, it is sent to the kneading machine (1) by the slurry transfer pump (7) and kneaded with the cement as described above.
必要に応じ、図示した例では洗浄タンクの上澄みの流路
や上澄水タンク（３）に、符号DWで示したように脱塩水
を加える。In the illustrated example, demineralized water is added to the supernatant channel or the supernatant water tank (3) in the illustrated example, as indicated by the reference symbol DW.
このようにして、セメント混練機を洗浄したときに発生
する洗浄廃水中のスラッジを混練機に移送して、セメン
トと混練するため、スラッジの固化体は均質で、その圧
縮強度も放射性廃棄物の固化体に要求される海洋投棄基
準をみたすレベルに達する。また、上澄水は、繰り返し
使用された後、セメント混練時の練り水として使用でき
るため、洗浄に伴い発生する固化体ドラム缶の本数も少
ない。In this way, the sludge in the washing wastewater generated when the cement kneader is washed is transferred to the kneader and kneaded with the cement, so that the solidified sludge is homogeneous and its compressive strength is equal to that of radioactive waste. It reaches a level that meets the ocean dumping standards required for solidified bodies. In addition, since the supernatant water can be used as kneading water during cement kneading after being repeatedly used, the number of solidified body drums generated by washing is small.
〔参考例１〕 原子力発電所から排出されるホウ酸含有廃液に似せた組
成の廃液を用意し、これをセメント固化処理したときに
混練機に付着したスラッジを採取した。スラッジの組成
は、重量比でホウ酸カルシウム：セメント：水:2:1:3で
あった。[Reference Example 1] A waste liquid having a composition similar to that of a boric acid-containing waste liquid discharged from a nuclear power plant was prepared, and sludge adhering to a kneading machine when the cement was solidified was collected. The composition of the sludge was calcium borate: cement: water: 2: 1: 3 by weight.
２個のビーカーにそれぞれ水100gを入れ、前記スラッジ
60gずつを加えて攪拌した。ひとつはそのまま攪拌を続
け、いまひとつは攪拌をやめて静置した。Put 100 g of water in each of two beakers, and add the sludge.
60 g each was added and stirred. One continued stirring as it was, and the other stopped stirring and allowed to stand.
攪拌をつづけたサンプルは長時間にわたりスラリーのま
まで変化がなかったが、静置した方はスラッジが凝固し
た。凝固体の圧縮強度は、２週間後に30kg/cm2、３カ月
後でも50kg/cm2にしかならなかった。The sample that was continuously stirred remained as a slurry for a long time without any change, but sludge solidified when the sample was left standing. The compressive strength of the solidified body was only 30 kg / cm 2 after 2 weeks and 50 kg / cm 2 after 3 months.
〔参考例２〕 ZnおよびPbを含んでいる焼却灰をセメント固化処理した
ときに混練機に付着したスラッジを採取し、参考例１と
同じ実験をした。[Reference Example 2] The same experiment as in Reference Example 1 was performed by collecting the sludge attached to the kneader when the incineration ash containing Zn and Pb was subjected to the cement solidification treatment.
結果は参考例１と同様で、攪拌を続けたものは変化がな
かったが、静置したものはスラッジが凝固した。凝固体
の圧縮強度は、２週間後が10kg/cm2、３カ月後でもわず
か20kg/cm2であった。The results were the same as those in Reference Example 1, and there was no change in the one that was continuously stirred, but the sludge solidified in the one that was left standing. The compressive strength of the solidified product was 10 kg / cm 2 after 2 weeks and only 20 kg / cm 2 after 3 months.
〔参考例３〕 参考例１で使用したホウ酸含有廃液をセメント固化処理
したのちに、混練機に付着したスラッジを水で洗い流
し、その洗浄廃水中のスラッジを下記の割合でセメント
と混練した固化した。[Reference Example 3] After the boric acid-containing waste liquid used in Reference Example 1 was subjected to a cement solidification treatment, the sludge adhering to the kneader was washed off with water, and the sludge in the washing waste water was kneaded with cement at the following ratio to solidify. did.
結果は、つぎのとおりである。The results are as follows.
〔実施例〕 図に示す構成の処理装置を使用し、放射性廃棄物を含む
廃液をセメント固化して、混練機の洗浄廃水を前記のよ
うにして保存したのち、スラッジを混練工程に戻してセ
メントと混合した。 [Example] Using a treatment apparatus having the configuration shown in the figure, the waste liquid containing radioactive waste is solidified with cement, and the washing wastewater of the kneading machine is stored as described above, and then the sludge is returned to the kneading step to cement. Mixed with.
混合比率は、スラッジ160kg:セメント230kgである。The mixing ratio is 160 kg of sludge: 230 kg of cement.
得られたセメント固化体の圧縮強度は、１カ月後には15
0kg/cm2を超えていた。The compressive strength of the obtained cement solidified body is 15 after one month.
It exceeded 0 kg / cm 2 .
本発明のセメント混練機の洗浄廃水処理方法によれば、
洗浄廃水中のスラッジはセメントと固化されるので、洗
浄スラッジだけの、不均質で強度の低い固化体ができる
ことはない。得られる固体化は、いずれも均質かつ高強
度で、長期の保存に耐える安定な固化体である。このよ
うにして、洗浄スラッジの処理に伴う問題点は解消し
た。According to the cleaning wastewater treatment method of the cement kneader of the present invention,
Since the sludge in the cleaning wastewater is solidified with cement, it is not possible to form a non-homogeneous and low-strength solidified product of the cleaning sludge alone. The solidifications obtained are all homogeneous and of high strength, and are stable solidified bodies that can withstand long-term storage. In this way, the problems associated with the treatment of cleaning sludge have been eliminated.
本発明の処理方法は、放射性廃液の処理に適用したと
き、とくに意義が大きいが、そのほか重金属を含有する
廃棄物の処理などにも有用である。The treatment method of the present invention is particularly significant when applied to the treatment of radioactive waste liquid, but is also useful for the treatment of waste containing heavy metals.
図面は、本発明の処理方法の実施に使用する装置のフロ
ーシートである。 １……混練機 ２……洗浄廃水タンク ３……上澄水タンク ４……廃液タンク ５……セメントホッパー ７……スラリー移送ポンプThe drawing is a flow sheet of an apparatus used for carrying out the processing method of the present invention. 1 …… Kneader 2 …… Washing wastewater tank 3 …… Supernatant water tank 4 …… Waste liquid tank 5 …… Cement hopper 7 …… Slurry transfer pump
Claims (3)
混合物を容器に注入して固化させるセメント固化処理を
行なうに際して、混練機のスラッジを洗浄することによ
り生じた洗浄廃水を洗浄廃水タンクに受けて、ゆるやか
に攪拌しつつスラッジが凝固しないように保存し、保存
した洗浄廃水のスラッジに富む部分を混練機に移送して
セメントと混練し、上澄水は上澄水タンクに送り、混練
機の洗浄に再利用することからなるセメント混練機の洗
浄廃水処理方法。1. A washing wastewater tank for washing wastewater generated by washing sludge in the kneader when the cement is solidified by kneading the waste liquid and cement with a kneader and pouring the mixture into a container for solidification. In order to prevent sludge from coagulating while gently stirring, the sludge-rich portion of the stored cleaning wastewater is transferred to a kneader and mixed with cement. A method for treating waste water of a cement kneading machine, which comprises reusing it for washing.
法。2. The processing method according to claim 1, wherein the waste liquid is a radioactive waste liquid.
の処理方法。3. The waste liquid is a waste liquid containing a harmful substance.
Processing method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63327306A JPH077101B2 (en) | 1988-12-23 | 1988-12-23 | Cleaning wastewater treatment method for cement kneader |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63327306A JPH077101B2 (en) | 1988-12-23 | 1988-12-23 | Cleaning wastewater treatment method for cement kneader |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02171693A JPH02171693A (en) | 1990-07-03 |
| JPH077101B2 true JPH077101B2 (en) | 1995-01-30 |
Family
ID=18197656
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63327306A Expired - Lifetime JPH077101B2 (en) | 1988-12-23 | 1988-12-23 | Cleaning wastewater treatment method for cement kneader |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH077101B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4064616B2 (en) * | 2000-10-26 | 2008-03-19 | 株式会社東芝 | Solidification method for radioactive waste |
| JP4166510B2 (en) * | 2002-06-07 | 2008-10-15 | 住友林業株式会社 | Cement cleaning water purification method and purifying bag body |
| JP5019147B2 (en) * | 2004-10-26 | 2012-09-05 | 崇幸 野村 | How to use washing wastewater from ready-mixed concrete equipment |
| JP2009023291A (en) * | 2007-07-23 | 2009-02-05 | Aizawa Koatsu Concrete Kk | Method and drum for retrieving rinse water of truck agitator drum |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5190000U (en) * | 1975-01-16 | 1976-07-19 | ||
| JPS51115520A (en) * | 1975-04-04 | 1976-10-12 | Sanko Co Inc | Process for reusing the water after cleaning a mixer automobile etc* as the water for mixing raw concrete grout |
-
1988
- 1988-12-23 JP JP63327306A patent/JPH077101B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02171693A (en) | 1990-07-03 |
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