JPH07232200A - Treatment of sludge - Google Patents
Treatment of sludgeInfo
- Publication number
- JPH07232200A JPH07232200A JP6026697A JP2669794A JPH07232200A JP H07232200 A JPH07232200 A JP H07232200A JP 6026697 A JP6026697 A JP 6026697A JP 2669794 A JP2669794 A JP 2669794A JP H07232200 A JPH07232200 A JP H07232200A
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- Prior art keywords
- sludge
- concentration
- tank
- present
- treatment
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- Treatment Of Sludge (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、下水や工場排水等の汚
泥を処理する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 method for treating sludge such as sewage and factory wastewater.
【０００２】[0002]
【従来の技術】従来、生活排水等の下水を処理する施設
においては、図４に示すような方法により汚泥を処理し
ている。2. Description of the Related Art Conventionally, in a facility for treating sewage such as domestic wastewater, sludge is treated by the method shown in FIG.
【０００３】すなわち、下水は、まず第１沈殿池に導か
れて、沈降物質が取り除かれる。ついで、第１沈殿池か
ら得られる上澄液は、曝気槽に送られて、曝気された
後、最終沈殿池で、不溶物を取り除いた後、放流され
る。最終沈殿池で取り除いた不沈物は第１沈殿池に返送
する。一方、第１沈殿池から引き抜かれた汚泥は濃縮槽
に送られ、濃縮槽内で、約１２時間程静置され、自然沈
降により２〜３重量％の濃度に濃縮される。濃縮槽で濃
縮された汚泥は、貯留槽を経由して、脱水機により脱水
されて、脱水ケーキと０．１重量％濃度以下の分離液に
分けられる。That is, the sewage is first guided to the first settling tank to remove sedimented substances. Then, the supernatant liquid obtained from the first settling tank is sent to an aeration tank and aerated, and then insolubles are removed in the final settling tank and then discharged. The unprecipitated material removed in the final settling tank is returned to the first settling tank. On the other hand, the sludge drawn out from the first settling tank is sent to a thickening tank, left to stand in the thickening tank for about 12 hours, and concentrated to 2-3% by weight by natural sedimentation. The sludge concentrated in the concentration tank is dehydrated by a dehydrator via a storage tank and separated into a dehydrated cake and a separated liquid having a concentration of 0.1% by weight or less.
【０００４】[0004]
【発明が解決しようとする課題】従来の汚泥処理方法で
は、脱水は、真空濾過機等の濾過機を用いていたため、
脱水する汚泥の濃度が２〜３重量％は必要であった。そ
のため、汚泥を沈降濃縮して濃度を２〜３重量％とする
ためには、濃縮槽で、約１２時間程度、静置せねばなら
なかった。In the conventional sludge treatment method, dehydration uses a filter such as a vacuum filter.
A concentration of 2-3% by weight of sludge to be dehydrated was necessary. Therefore, in order to settle and concentrate the sludge to a concentration of 2 to 3% by weight, the sludge must be allowed to stand for about 12 hours in the concentration tank.
【０００５】そのため、従来の汚泥処理方法は、以下の
ような問題点が生じていた。Therefore, the conventional sludge treatment method has the following problems.
【０００６】（１）汚泥を長時間にわたり濃縮槽に静置
するため、汚泥中の有機物が腐敗して、汚泥の沈降性が
低下する。そのため、汚泥がキャリーオーバーしたり、
汚泥の一部が浮上して固形物回収率が低下する。この現
象は、夏期において、顕著に発生する。(1) Since the sludge is allowed to stand in the thickening tank for a long time, the organic matter in the sludge is rotted and the sedimentation property of the sludge is lowered. Therefore, sludge carry over,
A part of the sludge floats up and the solid recovery rate decreases. This phenomenon remarkably occurs in the summer.
【０００７】（２）汚泥の腐敗が進行すると、脱水ケー
キの含水率が高くなるため、凝集剤の添加量を増加しな
ければならず、処理コストが上昇する。(2) As the sludge decays, the water content of the dehydrated cake increases, so the amount of the flocculant added must be increased and the treatment cost rises.
【０００８】（３）汚泥の腐敗により、悪臭が発生し、
作業環境が悪化する。(3) A bad odor is generated due to the deterioration of sludge,
The work environment deteriorates.
【０００９】（４）濃縮時間が、約１２時間と長いた
め、処理効率が悪い。(4) Since the concentration time is as long as about 12 hours, the treatment efficiency is poor.
【００１０】本発明は、従来方法の上記問題点を解消す
べくなされたものである。すなわち、本発明の目的は、
汚泥の腐敗が生ぜず、効率よく、低コストで、汚泥を処
理する方法を提供することである。The present invention has been made to solve the above problems of the conventional method. That is, the object of the present invention is to
It is an object of the present invention to provide a method for treating sludge efficiently, at low cost, which does not cause sludge spoilage.
【００１１】[0011]
【課題を解決するための手段】本発明者らは、上記課題
を解決すべく鋭意研究を重ねた結果、沈降濃縮に要する
時間を短縮し、低濃度で汚泥を脱水処理する方法を見い
だし、本発明を完成するに至った。As a result of intensive studies to solve the above problems, the present inventors have found a method for reducing the time required for sedimentation and concentration and dehydrating sludge at a low concentration. The invention was completed.
【００１２】すなわち、本発明は、汚泥を１〜３時間静
置して、濃度を０．５〜１．５重量％とし、濃縮した汚
泥に凝集剤を添加した後、遠心脱水機で脱水して、脱水
ケーキと分離液とする方法であって、遠心脱水された分
離液の濁度を計測し、凝集剤の添加量または遠心脱水機
のスクリューコンベアの回転数を制御して、脱水ケーキ
の含水率を一定に保つことを特徴とする汚泥処理方法、
に関するものである。以下、図面に基づいて本発明を説
明する。That is, according to the present invention, the sludge is allowed to stand for 1 to 3 hours to a concentration of 0.5 to 1.5% by weight, a coagulant is added to the concentrated sludge, and the sludge is dehydrated by a centrifugal dehydrator. In the method of the dehydrated cake and the separated liquid, the turbidity of the separated liquid after centrifugal dehydration is measured, and the addition amount of the coagulant or the rotation speed of the screw conveyor of the centrifugal dehydrator is controlled to obtain the dehydrated cake. A sludge treatment method characterized by keeping the water content constant,
It is about. The present invention will be described below with reference to the drawings.
【００１３】図１は、本発明方法のフローの一例を示す
図である。第１沈殿池から送られてきた汚泥ａは、濃縮
槽１に導かれ、ここで汚泥濃度が０．５〜１．５重量％
となるまで静置される。汚泥濃度が、０．５〜１．５重
量％となるまでの時間は、汚泥の性状により異なるが、
通常は１〜３時間である。従来の汚泥処理方法で採用さ
れてきた、静置時間が１２時間である場合に比較し、本
発明方法は、汚泥の濃縮濃度を０．５〜１．５重量％と
低濃度のままとすることにより、汚泥の静置時間を１〜
３時間に短縮したことに特徴がある。したがって、本発
明方法では、例え夏期であっても、汚泥の腐敗が進行す
ることはない。FIG. 1 is a diagram showing an example of the flow of the method of the present invention. The sludge a sent from the first settling tank is guided to the concentration tank 1 where the sludge concentration is 0.5 to 1.5% by weight.
It is left to stand until. The time until the sludge concentration reaches 0.5 to 1.5% by weight depends on the property of the sludge,
Usually, it is 1 to 3 hours. Compared with the case where the standing time is 12 hours, which has been adopted in the conventional sludge treatment method, the method of the present invention keeps the concentration of sludge as low as 0.5 to 1.5% by weight. Therefore, the sludge standing time is 1 to
It is characterized by shortening to 3 hours. Therefore, according to the method of the present invention, spoilage does not progress even in the summer.
【００１４】濃縮汚泥濃度が０．５重量％未満では、脱
水に消費するエネルギーが大きくなる点で、また１．５
重量％を超えると、静置時間が長くなり、汚泥の腐敗が
進行する点で好ましくない。When the concentration of the concentrated sludge is less than 0.5% by weight, the energy consumed for dehydration becomes large, and it is 1.5%.
If it exceeds 5% by weight, the standing time becomes long, and the deterioration of sludge proceeds, which is not preferable.
【００１５】次いで濃縮された汚泥は、供給槽２に引き
抜かれ、汚泥供給ポンプ３により遠心脱水機４に定量的
に供給される。供給槽２は、バッファーもしくは引き抜
き汚泥量と供給汚泥量の均衡を図るために設けるが、必
ずしも必要なものではなく、場合により省略してもよ
い。Next, the concentrated sludge is drawn out to the supply tank 2 and quantitatively supplied to the centrifugal dehydrator 4 by the sludge supply pump 3. The supply tank 2 is provided to balance the amount of buffer or drawn sludge with the amount of supplied sludge, but it is not always necessary and may be omitted in some cases.
【００１６】汚泥供給ポンプ３より給送された汚泥に、
凝集剤供給槽５より凝集剤を注入した後、遠心脱水機４
に供給し遠心脱水する。濃度０．５〜１．５重量％の汚
泥は、２５重量％以上の脱水ケーキ７と０．１重量％以
下の分離水に分離される。For the sludge fed from the sludge supply pump 3,
After injecting the coagulant from the coagulant supply tank 5, the centrifugal dehydrator 4
And centrifugal dehydration. Sludge having a concentration of 0.5 to 1.5% by weight is separated into 25% by weight or more of dehydrated cake 7 and 0.1% by weight or less of separated water.
【００１７】本発明の汚泥処理方法は、汚泥の静置時間
が１〜３時間と短いため、濃縮汚泥の濃度の変動が大き
くなり、脱水ケーキの含水率が変動することになる。従
って、安定した汚泥処理を行うために、遠心脱水機４か
ら得られる分離水の濁度を計測し、凝集剤の添加濃度ま
たは遠心分離機４のスクリュウーコンベアの回転数を制
御する。In the sludge treatment method of the present invention, since the sludge standing time is as short as 1 to 3 hours, the concentration of the concentrated sludge varies greatly and the water content of the dehydrated cake varies. Therefore, in order to perform the stable sludge treatment, the turbidity of the separated water obtained from the centrifugal dehydrator 4 is measured, and the addition concentration of the coagulant or the rotation speed of the screw conveyor of the centrifugal separator 4 is controlled.
【００１８】すなわち、遠心脱水機４から出てくる、分
離水ｃの濁度を濁度計１１により、濁度を計測し、その
値を凝集剤流量調整装置９またはスクリュウーコンベア
回転数制御装置８に入力し、凝集剤供給ポンプ６または
モータ１０を制御して、得られる脱水ケーキ７の含水率
および分離水の濃度が一定になるようにする。That is, the turbidity of the separated water c coming out of the centrifugal dehydrator 4 is measured by a turbidimeter 11, and the value is measured by a coagulant flow rate adjusting device 9 or a screw conveyor rotation speed control device 8 To control the flocculant supply pump 6 or the motor 10 so that the water content of the dehydrated cake 7 and the concentration of the separated water are constant.
【００１９】図２は、回分式濃縮槽における汚泥の界面
高さと、静置時間の関係をグラフに示したものである。
縦軸に汚泥の界面の高さをとり、横軸に静置時間をとっ
たものである。濃縮中の汚泥の沈降は、沈降速度の速い
自由沈降領域と、その後の圧密により沈降速度の遅い圧
密領域とに分類される。本発明方法における濃縮は、自
由沈降領域で行い、濃縮濃度の低いまま遠心脱水機によ
り、脱水処理を行うことを特徴とするものである。FIG. 2 is a graph showing the relationship between the interfacial height of sludge and the standing time in the batch type concentration tank.
The vertical axis is the sludge interface height, and the horizontal axis is the standing time. The settling of sludge during concentration is classified into a free settling region with a fast settling rate and a consolidation region with a slow settling rate due to subsequent consolidation. Concentration in the method of the present invention is characterized in that the concentration is carried out in a free sedimentation region and the dehydration treatment is carried out by a centrifugal dehydrator while the concentration concentration is low.
【００２０】本発明方法における濃縮槽における汚泥の
沈降状態と、従来の汚泥処理方法における汚泥の沈降状
況を、図３に例示する。。図３の（Ａ）は、本発明方法
の汚泥の濃縮の最終過程における状態を示した図であ
り、例えば、Ｈ1≒１ｍ、ｔ1≒３時間で、濃度０．５〜
１．５重量％に濃縮するものである。図２（Ｂ）は、従
来方法における汚泥の濃縮の最終過程における状態を示
した図であり、例えばＨ2＝３ｍ、ｔ2＝１２時間であ
り、汚泥の濃度は２〜３重量％である。The settling state of sludge in the concentration tank in the method of the present invention and the settling state of sludge in the conventional sludge treatment method are illustrated in FIG. . FIG. 3 (A) is a diagram showing a state in the final process of sludge concentration according to the method of the present invention. For example, when H 1 ≈1 m and t 1 ≈3 hours, the concentration is 0.5 to
It is concentrated to 1.5% by weight. FIG. 2B is a diagram showing a state in the final process of sludge concentration in the conventional method, for example, H 2 = 3 m, t 2 = 12 hours, and the sludge concentration is 2 to 3% by weight. .
【００２１】本発明方法における、濃縮槽の汚泥の界面
高さは、約１ｍであり、従来方法の汚泥の界面高さ３ｍ
と比較して、低いので、汚泥が濃縮槽からキャリーオー
バーして、回収率が低下することはない。In the method of the present invention, the interface height of the sludge in the concentration tank is about 1 m, and the interface height of the sludge of the conventional method is 3 m.
Compared with, the sludge does not carry over from the concentration tank and the recovery rate does not decrease.
【００２２】また、濃縮槽における静置時間も１〜３時
間と、短いため、汚泥が腐敗することはない。さらに、
汚泥の静置時間が１〜３時間ですむため、濃縮槽の容量
を小さくすることが可能である。Further, since the standing time in the concentrating tank is as short as 1 to 3 hours, the sludge will not decompose. further,
Since the sludge can be left standing for 1 to 3 hours, it is possible to reduce the capacity of the concentration tank.
【００２３】[0023]
実施例１〜２，比較例１ 図１に示す汚泥処理装置を用いて、本発明方法により下
水汚泥を処理した。分離水の濁度は、透過型濁度計で計
測し、凝集剤供給量を制御する方法を採用した。処理に
供した汚泥の性状および処理の結果を表１に示す。Examples 1-2 and Comparative Example 1 Sewage sludge was treated by the method of the present invention using the sludge treatment device shown in FIG. The turbidity of the separated water was measured with a transmission turbidimeter, and a method of controlling the coagulant supply amount was adopted. Table 1 shows the properties of the sludge subjected to the treatment and the treatment results.
【００２４】なお、比較例として、図４に示す処理装置
を用いて、下水汚泥を処理した。その結果も併せて、表
１に示す。As a comparative example, the treatment equipment shown in FIG. 4 was used to treat the sewage sludge. The results are also shown in Table 1.
【００２５】[0025]
【表１】 [Table 1]
【００２６】表１の結果から明らかなように、本発明方
法は、従来法と比較して、濃縮時間が短縮され、高分子
凝集剤の添加率が低くても脱水ケーキの含水率が低くな
ることが分かる。また、夏期において、本発明の汚泥処
理方法では、汚泥が腐敗することはなかったのに対し、
従来方法では、汚泥が腐敗し、悪臭が発生した。As is clear from the results in Table 1, the method of the present invention has a shorter concentration time than the conventional method, and the water content of the dehydrated cake is low even if the addition rate of the polymer flocculant is low. I understand. Further, in the summer, in the sludge treatment method of the present invention, sludge was not decomposed,
In the conventional method, the sludge was decomposed and a foul odor was generated.
【００２７】[0027]
【発明の効果】本発明方法は、以下のような効果を有し
ている。The method of the present invention has the following effects.
【００２８】（１）濃縮槽における静置時間が短いた
め、汚泥の腐敗による変性を防止することができる。(1) Since the standing time in the concentration tank is short, it is possible to prevent the sludge from being denatured due to putrefaction.
【００２９】（２）汚泥の腐敗による脱水ケーキの含水
率の上昇が防止できるため、焼却や投棄に要する費用を
削減できる。(2) Since it is possible to prevent an increase in the water content of the dehydrated cake due to spoilage of sludge, it is possible to reduce the costs required for incineration and disposal.
【００３０】（３）高分子凝集剤の使用量を削減でき、
汚泥処理コストを低減できる。(3) The amount of polymer flocculant used can be reduced,
Sludge treatment cost can be reduced.
【００３１】（４）濃縮槽を小さくすることができ、設
置面積の削減および、汚泥界面を低い状態で運転できる
ため、キャリーオーバーがなく、固形物回収率が向上す
る。(4) Since the concentration tank can be downsized, the installation area can be reduced and the sludge interface can be operated in a low state, there is no carryover and the solid recovery rate is improved.
【００３２】（５）汚泥の腐敗による臭気の発生を防止
できる。(5) It is possible to prevent the generation of odor due to spoilage of sludge.
【００３３】（６）濃縮時間が短縮され、汚泥処理に要
する時間が短くなり、汚泥処理効率が向上する。(6) The concentration time is shortened, the time required for sludge treatment is shortened, and sludge treatment efficiency is improved.
【図１】本発明の汚泥処理方法方法を示すフロー図。FIG. 1 is a flow chart showing a sludge treatment method method of the present invention.
【図２】濃縮槽における、静置時間と汚泥の界面の関係
を示すグラフ。FIG. 2 is a graph showing the relationship between the standing time and the sludge interface in the concentrating tank.
【図３】濃縮槽における、汚泥の界面の高さを示す図
で、（Ａ）は本発明方法、（Ｂ）は従来方法における汚
泥の界面の高さを示す図。FIG. 3 is a view showing the height of the interface of sludge in the concentration tank, (A) is a method of the present invention, and (B) is a view showing the height of the interface of sludge in the conventional method.
【図４】従来の汚泥処理方法を示すフロー図。FIG. 4 is a flowchart showing a conventional sludge treatment method.
１ 濃縮槽 ２ 供給槽 ３ 汚泥供給ポンプ ４ 遠心脱水機 ５ 凝集剤供給槽 ６ 凝集剤供給ポンプ ７ 脱水ケーキ ８ スクリュウーコンベア回転数制御装置 ９ 凝集剤流量調整装置 １０ モータ １１ 濁度計 ａ，ａ’ 未処理汚泥 ｂ，ｂ’ 濃縮汚泥 1 Concentration tank 2 Supply tank 3 Sludge supply pump 4 Centrifugal dewatering machine 5 Coagulant supply tank 6 Coagulant supply pump 7 Dewatering cake 8 Screw screw conveyor rotation speed controller 9 Coagulant flow rate controller 10 Motor 11 Turbidity meter a, a ' Untreated sludge b, b'concentrated sludge
───────────────────────────────────────────────────── フロントページの続き (72)発明者 矢野 宰平 千葉県習志野市本大久保２−４−３−605 (72)発明者 下山 育雄 東京都江東区木場３−４−17−103 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Saihei Yano 2-4-3-605 Motookubo, Narashino-shi, Chiba (72) Inventor Ikuo Shimoyama 3-4-17-103 Kiba, Koto-ku, Tokyo
Claims (1)
５〜１．５重量％とし、濃縮した汚泥に凝集剤を添加し
た後、遠心脱水機で脱水して、脱水ケーキと分離液に分
離する方法であって、遠心脱水された分離液の濁度を計
測し、凝集剤の添加量または遠心脱水機のスクリューコ
ンベアの回転数を制御して、脱水ケーキの含水率を一定
に保つことを特徴とする汚泥処理方法。1. The sludge is allowed to stand for 1 to 3 hours to reach a concentration of 0.
A method of adding 5 to 1.5% by weight and adding a coagulant to concentrated sludge, followed by dehydration with a centrifugal dehydrator to separate a dehydrated cake and a separated liquid, wherein the turbidity of the separated liquid after centrifugal dehydration Is measured and the amount of coagulant added or the number of revolutions of the screw conveyor of the centrifugal dehydrator is controlled to keep the water content of the dehydrated cake constant.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6026697A JPH07232200A (en) | 1994-02-24 | 1994-02-24 | Treatment of sludge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6026697A JPH07232200A (en) | 1994-02-24 | 1994-02-24 | Treatment of sludge |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07232200A true JPH07232200A (en) | 1995-09-05 |
Family
ID=12200588
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6026697A Pending JPH07232200A (en) | 1994-02-24 | 1994-02-24 | Treatment of sludge |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07232200A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004167401A (en) * | 2002-11-20 | 2004-06-17 | Toshiba Corp | Waste water treatment equipment and waste water treatment method |
| JP2013000692A (en) * | 2011-06-20 | 2013-01-07 | Takuma Co Ltd | Sludge treatment system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6054753A (en) * | 1983-09-05 | 1985-03-29 | Hitachi Ltd | Turbidity controlling device of centrifugal dehydrator |
| JPS6190799A (en) * | 1984-10-08 | 1986-05-08 | Mitsubishi Gas Chem Co Inc | Method for controlling rancidity of sludge |
| JPH04171066A (en) * | 1990-11-05 | 1992-06-18 | Alfa Laval Ab | Sludge dehydration control device of centrifugal separator of screw decanter type |
-
1994
- 1994-02-24 JP JP6026697A patent/JPH07232200A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6054753A (en) * | 1983-09-05 | 1985-03-29 | Hitachi Ltd | Turbidity controlling device of centrifugal dehydrator |
| JPS6190799A (en) * | 1984-10-08 | 1986-05-08 | Mitsubishi Gas Chem Co Inc | Method for controlling rancidity of sludge |
| JPH04171066A (en) * | 1990-11-05 | 1992-06-18 | Alfa Laval Ab | Sludge dehydration control device of centrifugal separator of screw decanter type |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004167401A (en) * | 2002-11-20 | 2004-06-17 | Toshiba Corp | Waste water treatment equipment and waste water treatment method |
| JP2013000692A (en) * | 2011-06-20 | 2013-01-07 | Takuma Co Ltd | Sludge treatment system |
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