JP2927381B2 - Sludge dewatering method - Google Patents
Sludge dewatering methodInfo
- Publication number
- JP2927381B2 JP2927381B2 JP4332104A JP33210492A JP2927381B2 JP 2927381 B2 JP2927381 B2 JP 2927381B2 JP 4332104 A JP4332104 A JP 4332104A JP 33210492 A JP33210492 A JP 33210492A JP 2927381 B2 JP2927381 B2 JP 2927381B2
- Authority
- JP
- Japan
- Prior art keywords
- sludge
- dewatering
- tank
- concentrated
- dewatering method
- 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
Description
【０００１】[0001]
【産業上の利用分野】本発明は、水処理施設における汚
泥脱水方法に関する。The present invention relates to a method for dewatering sludge in a water treatment facility.
【０００２】[0002]
【従来の技術】従来、水処理工程から引き抜かれた余剰
汚泥は、図３に示したようなフローで脱水されている。
すなわち、余剰汚泥１を汚泥濃縮槽２に移送し、この槽
２で沈降した濃縮汚泥３を槽２の下部からポンプ４で取
り出し、一旦、汚泥貯留槽５に送って、ブロワー６、散
気装置７などで空気を供給しながら貯えている。そし
て、この汚泥８を、脱水効率を高めるためにポンプ９で
汚泥混和槽１０に移して、攪拌装置１１で攪拌しながら
凝集剤１２を添加することにより凝集させ、凝集した汚
泥１３をポンプ１４で脱水装置１５に送って、脱水を行
っている。2. Description of the Related Art Conventionally, surplus sludge extracted from a water treatment process is dehydrated by a flow as shown in FIG.
That is, the excess sludge 1 is transferred to the sludge thickening tank 2, the concentrated sludge 3 settled in the tank 2 is taken out from the lower part of the tank 2 by the pump 4, and once sent to the sludge storage tank 5, where the blower 6 and the air diffuser 7 and so on while supplying air. The sludge 8 is transferred to a sludge mixing tank 10 by a pump 9 in order to increase the dewatering efficiency, and is aggregated by adding a flocculant 12 while stirring with a stirring device 11. It is sent to the dehydration device 15 to perform dehydration.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら上記の脱
水方法では、濃縮工程が重力式であるため濃縮汚泥濃度
に変動があり、特にろ布型脱水機（ＢＰ，ＦＰ）を使用
する場合、処理量、含水率等の脱水効率が低下するとい
う問題があった。However, in the above-mentioned dewatering method, the concentration of the concentrated sludge fluctuates due to the gravity type of the concentration step. In particular, when a filter cloth type dehydrator (BP, FP) is used, the throughput is reduced. In addition, there is a problem that the dewatering efficiency such as the water content decreases.
【０００４】また、汚泥濃縮槽や汚泥貯留槽において嫌
気状態が長くなり、汚泥混和槽に投入される汚泥が嫌気
汚泥となった場合、凝集性が悪化するので、これを凝集
させるために凝集剤の添加量を増加しなければならない
という問題があった。Further, when the anaerobic condition in the sludge concentration tank or the sludge storage tank becomes longer and the sludge fed into the sludge mixing tank becomes anaerobic sludge, the coagulability deteriorates. However, there is a problem that the amount of addition must be increased.
【０００５】本発明は上記問題を解決するもので、脱水
効率がよく、かつ凝集剤の添加量を増加する必要のない
汚泥脱水方法を提供することを目的とするものである。An object of the present invention is to solve the above-mentioned problems, and an object of the present invention is to provide a sludge dewatering method which has a good dewatering efficiency and does not require an increase in the amount of a coagulant added.
【０００６】[0006]
【課題を解決するための手段】上記問題を解決するため
に本発明の汚泥脱水方法では、水処理工程より引き抜か
れた余剰汚泥を凝集し、脱水するに先立って、前記余剰
汚泥を処理槽に導入し、空気または酸素を供給して好気
状態に維持しつつ、槽内に設置した浸漬型膜装置で固液
分離することにより濃縮するようにしたものである。SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the sludge dewatering method of the present invention involves removing the sludge from the water treatment step.
Prior to coagulation and dewatering of the excess sludge
Introduce sludge into the treatment tank and supply air or oxygen to aerobic
While maintaining the state, solid-liquid with the immersion type membrane device installed in the tank
It is intended to be concentrated by separation .
【０００７】[0007]
【作用】上記構成により、浸漬型膜装置によって汚泥を
高濃度化できるとともに、空気または酸素によって好気
汚泥として凝集性を高めることができ、その結果、凝集
剤の添加量を減少しながらも、脱水汚泥の含水率を低下
することができ、脱水工程の安定化をも図ることができ
る。 According to the above construction, sludge is removed by the immersion type membrane device.
Can be concentrated and aerobic by air or oxygen
The coagulation property can be increased as sludge, and as a result,
Reduces the water content of dewatered sludge while reducing the amount of additive
Can stabilize the dehydration process.
You.
【０００８】[0008]
【実施例】以下、本発明の汚泥脱水方法を図１および図
２に基づいて説明する。図１は、本発明の一実施例の汚
泥脱水方法を示す。この実施例の脱水方法で使用される
装置は従来の脱水方法で使用される装置とほぼ同じなの
で、同じ構成および同じ作用を有するものには同じ符号
を付して、その説明を省略する。ここで従来と異なるの
は、汚泥貯留槽５に浸漬型膜装置１６を設置した点であ
る。この浸漬型膜装置１６は、槽５の外部に設けられた
吸引ポンプ１７などに接続していて、このポンプ１７に
より吸引圧を負荷可能である。また、貯留槽５に設けら
れた散気装置７は、槽５外部のブロワー６などにより、
濃縮汚泥３に空気または酸素を供給して汚泥３を好気状
態に維持可能であり、かつ汚泥３を攪拌して膜装置１６
に対する膜面流を生起可能である。この構成により、汚
泥貯留槽５に送られた濃縮汚泥３は好気汚泥となるとと
もに、浸漬型膜装置１６に負圧をかけて透過液１８を取
り出すことで固液分離されて、さらに濃縮される。濃縮
された汚泥１９は、従来法と同様に、汚泥混和槽１０で
凝集され、その後、脱水装置１５に送られて脱水され
る。この結果、好気汚泥となって凝集性が改善されると
ともに、あらかじめ濃縮された汚泥が脱水されるため、
汚泥の脱水効率が高くなる。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The sludge dewatering method of the present invention will be described below with reference to FIGS. FIG. 1 shows a sludge dewatering method according to one embodiment of the present invention. Since the apparatus used in the dehydration method of this embodiment is almost the same as the apparatus used in the conventional dehydration method, those having the same configuration and the same action are denoted by the same reference numerals, and description thereof will be omitted. Here, the difference from the conventional one is that the immersion type membrane device 16 is installed in the sludge storage tank 5. The immersion type membrane device 16 is connected to a suction pump 17 provided outside the tank 5 and the like, and can apply a suction pressure by the pump 17. The air diffuser 7 provided in the storage tank 5 is provided by a blower 6 outside the tank 5 or the like.
The sludge 3 can be maintained in an aerobic state by supplying air or oxygen to the concentrated sludge 3, and the sludge 3 is stirred to form a membrane device 16.
Can be generated. With this configuration, the concentrated sludge 3 sent to the sludge storage tank 5 becomes aerobic sludge, and is separated into solid and liquid by taking out the permeate 18 by applying a negative pressure to the immersion type membrane device 16 and further concentrated. You. The concentrated sludge 19 is coagulated in the sludge mixing tank 10 as in the conventional method, and then sent to the dewatering device 15 to be dewatered. As a result, aerobic sludge is improved and cohesion is improved, and sludge that has been concentrated in advance is dehydrated.
The sludge dewatering efficiency increases.
【０００９】図２は、本発明の別の実施例の汚泥脱水方
法を示す。この実施例の脱水方法が図１に示した脱水方
法と異なるのは、浸漬型膜装置１６を汚泥貯留槽５内に
設置せず、汚泥貯留槽５と汚泥混和槽１０との間に別に
膜濃縮槽２０を設けて、この膜濃縮槽２０内に浸漬型膜
装置１６を設置した点である。汚泥貯留槽５において空
気または酸素が供給される状態で一時貯えられた濃縮汚
泥８は、ポンプ９などで膜濃縮槽２０に送られ、槽２０
内において浸漬型膜装置１６により透過水１８が取り出
されることによって、さらに濃縮される。濃縮された汚
泥２１は、従来の方法および図１に示した方法と同様
に、汚泥混和槽１０、次いで脱水装置１５に送られ、脱
水される。従ってこの方法によっても、汚泥の凝集性を
改善できるとともに、脱水効率を高くできる。FIG. 2 shows a sludge dewatering method according to another embodiment of the present invention. The dewatering method of this embodiment is different from the dewatering method shown in FIG. 1 in that the immersion type membrane device 16 is not installed in the sludge storage tank 5 and a separate membrane is provided between the sludge storage tank 5 and the sludge mixing tank 10. The point is that the concentration tank 20 is provided, and the immersion type membrane device 16 is installed in the film concentration tank 20. The concentrated sludge 8 temporarily stored in the sludge storage tank 5 in a state where air or oxygen is supplied is sent to a membrane concentration tank 20 by a pump 9 or the like,
The permeated water 18 is taken out by the immersion type membrane device 16 in the inside thereof, whereby it is further concentrated. The concentrated sludge 21 is sent to the sludge mixing tank 10 and then to the dewatering device 15 to be dewatered similarly to the conventional method and the method shown in FIG. Therefore, this method can also improve the cohesiveness of the sludge and increase the dewatering efficiency.
【００１０】上記の方法において、汚泥濃縮槽を省略す
ることも可能である。以下に本発明の汚泥脱水方法の効
果を、従来法と比較して示す。表１は脱水装置としてベ
ルトプレス脱水機を用いた場合であり、表２は脱水装置
として遠心脱水機を用いた場合である。In the above method, the sludge thickening tank can be omitted. The effects of the sludge dewatering method of the present invention will be described below in comparison with the conventional method. Table 1 shows the case where a belt press dehydrator was used as a dehydrator, and Table 2 shows the case where a centrifugal dehydrator was used as a dehydrator.
【００１１】[0011]
【表１】 [Table 1]
【００１２】表１から明らかなように、ベルトプレス脱
水機を用いて脱水した場合、本発明方法は従来法に比
べ、脱水機への供給汚泥濃度が高くなって、脱水後の汚
泥含水率が低下し、処理量（乾燥固形物）も増大してい
る。また凝集剤の薬注率も減少している。As is clear from Table 1, when dewatering using a belt press dewatering machine, the method of the present invention has a higher sludge concentration supplied to the dewatering machine than the conventional method, and the water content of the sludge after dewatering is higher. And the throughput (dry solids) has increased. Also, the injection rate of flocculant is decreasing.
【００１３】[0013]
【表２】 [Table 2]
【００１４】表２から明らかなように、遠心脱水機を用
いて脱水した場合、本発明方法は従来法に比べ、脱水機
への供給汚泥濃度が高くなって、脱水後の汚泥含水率が
低下し、処理量（乾燥固形物）も増大している。As is clear from Table 2, when dewatering using a centrifugal dehydrator, the method of the present invention has a higher concentration of sludge supplied to the dehydrator and lowers the water content of the sludge after dehydration as compared with the conventional method. And the throughput (dry solids) is also increasing.
【００１５】[0015]
【発明の効果】以上のように本発明によれば、脱水前に
浸漬型膜装置で処理することにより、脱水装置への供給
汚泥の高濃度化が図れ、それに伴い、脱水効率が上昇し
た。As described above, according to the present invention, the concentration of the sludge supplied to the dehydrating apparatus can be increased by treating with the immersion type membrane apparatus before the dehydrating, and the dewatering efficiency is increased accordingly.
【００１６】また、浸漬型膜装置を浸漬した槽では、空
気または酸素を供給しながら膜分離を行うため、汚泥は
好気汚泥となって凝集性が改善され、これにより凝集剤
の添加量を減少させることができた。In the tank in which the immersion type membrane device is immersed, the membrane is separated while supplying air or oxygen, so that the sludge becomes aerobic sludge and the coagulation property is improved. Could be reduced.
【００１７】さらに、空気または酸素の供給量の調整に
より汚泥濃度を調整できるため、脱水工程の安定化が図
れた。Further, since the sludge concentration can be adjusted by adjusting the supply amount of air or oxygen, the dehydration step can be stabilized.
【図１】本発明の一実施例の汚泥脱水方法を示した説明
図である。FIG. 1 is an explanatory view showing a sludge dewatering method according to one embodiment of the present invention.
【図２】本発明の別の実施例の汚泥脱水方法を示した説
明図である。FIG. 2 is an explanatory view showing a sludge dewatering method according to another embodiment of the present invention.
【図３】従来の汚泥脱水方法を示した説明図である。FIG. 3 is an explanatory view showing a conventional sludge dewatering method.
１５ 脱水装置 １６ 浸漬型膜装置 15 Dewatering device 16 Immersion type membrane device
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.6，ＤＢ名) C02F 11/00 - 11/20 ──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. 6 , DB name) C02F 11/00-11/20
Claims (1)
凝集し、脱水するに先立って、前記余剰汚泥を処理槽に
導入し、空気または酸素を供給して好気状態に維持しつ
つ、槽内に設置した浸漬型膜装置で固液分離することに
より濃縮することを特徴とする汚泥脱水方法。1. Excess sludge extracted from the water treatment step
Prior to coagulation and dehydration, the excess sludge is transferred to a treatment tank.
And maintain it aerobic by supplying air or oxygen.
First, solid-liquid separation is performed using a submerged membrane device installed in the tank.
A sludge dewatering method characterized by further concentrating .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4332104A JP2927381B2 (en) | 1992-12-14 | 1992-12-14 | Sludge dewatering method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4332104A JP2927381B2 (en) | 1992-12-14 | 1992-12-14 | Sludge dewatering method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06179000A JPH06179000A (en) | 1994-06-28 |
| JP2927381B2 true JP2927381B2 (en) | 1999-07-28 |
Family
ID=18251201
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4332104A Expired - Lifetime JP2927381B2 (en) | 1992-12-14 | 1992-12-14 | Sludge dewatering method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2927381B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7879229B2 (en) | 2003-10-29 | 2011-02-01 | Zenon Technology Partnership | Water treatment plant with immersed membranes |
| US8114293B2 (en) | 2003-10-29 | 2012-02-14 | Zenon Technology Partnership | Method of operating a water treatment plant with immersed membranes |
-
1992
- 1992-12-14 JP JP4332104A patent/JP2927381B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06179000A (en) | 1994-06-28 |
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