JPH0780500A - Method for concentrating sludge - Google Patents
Method for concentrating sludgeInfo
- Publication number
- JPH0780500A JPH0780500A JP5230184A JP23018493A JPH0780500A JP H0780500 A JPH0780500 A JP H0780500A JP 5230184 A JP5230184 A JP 5230184A JP 23018493 A JP23018493 A JP 23018493A JP H0780500 A JPH0780500 A JP H0780500A
- Authority
- JP
- Japan
- Prior art keywords
- ozone
- sludge
- treatment
- line
- excess
- 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.)
- Granted
Links
Landscapes
- Separation Using Semi-Permeable Membranes (AREA)
- Treatment Of Sludge (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は下水汚処理、し尿処理及
び産業廃水処理などの各種廃水処理施設から発生する余
剰汚泥の濃縮方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for concentrating surplus sludge generated from various wastewater treatment facilities such as sewage treatment, night soil treatment and industrial wastewater treatment.
【０００２】[0002]
【従来の技術】従来の廃水処理施設から発生する生物処
理余剰汚泥の処理法を図２によって説明する。図２にお
いて、１は原液導入ライン、２は生物処理装置、３は凝
集沈殿装置、４はオゾン処理装置、５は生物処理水排出
ライン、６は余剰汚泥取出しライン、７は汚泥貯留槽、
８は濃縮装置、９は脱水機、１０は乾燥機、１１は焼却
炉、１２はオゾン供給ライン、１３は排出オゾンライ
ン、１４は濃縮分離液返送ライン、１５は活性炭吸着槽
である。2. Description of the Related Art A conventional method for treating biologically treated excess sludge generated from a wastewater treatment facility will be described with reference to FIG. In FIG. 2, 1 is a stock solution introduction line, 2 is a biological treatment device, 3 is a coagulating sedimentation device, 4 is an ozone treatment device, 5 is a biological treated water discharge line, 6 is an excess sludge take-out line, 7 is a sludge storage tank,
8 is a concentrator, 9 is a dehydrator, 10 is a dryer, 11 is an incinerator, 12 is an ozone supply line, 13 is an exhaust ozone line, 14 is a concentrated separated liquid return line, and 15 is an activated carbon adsorption tank.
【０００３】従来の廃水処理施設から発生する生物処理
余剰汚泥は、図２に示すように、一旦汚泥貯留槽７に貯
留された後、濃縮装置８、脱水機９、乾燥機１０を経て
焼却炉１２で焼却処理することを基本構成とするもので
あり、濃縮装置８は重力分離法、加圧浮上分離法、遠心
分離法を採用するものであった。しかしながら、これら
の濃縮装置８では固形物回収率が低いという問題点があ
った。そこで本発明者は従来の濃縮装置の代替として、
固形物回収率が極めて高い（例えば９５％以上）限外ろ
過、精密ろ過などの膜分離を適用する技術を提案した
（特願平４−２６４７１１号）。As shown in FIG. 2, biological treatment surplus sludge generated from a conventional wastewater treatment facility is temporarily stored in a sludge storage tank 7 and then passed through a concentrator 8, a dehydrator 9 and a drier 10 to an incinerator. The basic configuration is to incinerate at 12, and the concentrating device 8 employs a gravity separation method, a pressure floating separation method, and a centrifugal separation method. However, these concentrators 8 have a problem that the solid recovery rate is low. Therefore, the present inventor has proposed, as an alternative to the conventional concentrator,
A technique for applying membrane separation such as ultrafiltration and microfiltration, which has an extremely high solids recovery rate (for example, 95% or more), has been proposed (Japanese Patent Application No. 4-264711).
【０００４】[0004]
【発明が解決しようとする課題】膜分離を濃縮に適用し
た場合、高い固形物回収率を維持でき、これに起因して
濃縮分離液水質が大幅に改善されるが、一方において一
定の濃縮限界の存在することを本発明者は幾多の実験的
検討で把握している。When the membrane separation is applied to the concentration, a high solids recovery rate can be maintained, which greatly improves the water quality of the concentrated separation liquid, but on the other hand, it has a certain concentration limit. The present inventor has grasped the existence of the above by various experimental studies.
【０００５】そこで、本発明は上記本発明者が先に提案
した膜分離法による余剰汚泥の濃縮率をさらに向上させ
うる方法を提供しようとするものである。Therefore, the present invention is intended to provide a method capable of further improving the concentration rate of excess sludge by the membrane separation method previously proposed by the present inventor.
【０００６】[0006]
【課題を解決するための手段】本発明は各種廃水の生物
処理工程から発生する余剰汚泥を膜分離により濃縮方法
において、膜分離前の汚泥に、生物処理後の廃水のＣＯ
Ｄ、色度除去を行なう高度処理に適用するオゾン処理後
の排出オゾンを吹込むことを特徴とする汚泥濃縮方法で
ある。According to the present invention, in a method for concentrating surplus sludge generated from a biological treatment process of various wastewaters by membrane separation, the sludge before membrane separation is treated with CO of wastewater after biological treatment.
D is a sludge concentration method characterized by blowing in ozone discharged after ozone treatment, which is applied to advanced treatment for removing chromaticity.
【０００７】本発明者は先に提案した膜分離法におい
て、余剰汚泥の濃縮限界が存在するのは対象物が生物処
理余剰汚泥であることから、微生物表層部を覆うゼラチ
ン状の粘膜質が濃縮阻害となり、さらにこれが高濃度化
によって粘度上昇することになることに起因し、この複
雑な多糖質物質である粘質膜を酸化分解して低分子化、
低粘質化にすれば濃縮限界汚泥濃度を高めることができ
るとの知見に至り、本発明を完成するに至ったものであ
る。In the membrane separation method proposed above, the present inventor has a concentration limit for excess sludge because the target is biologically treated excess sludge, so that the gelatinous mucosa covering the surface layer of microorganisms is concentrated. This is due to the fact that it becomes an inhibition and that the viscosity increases due to the increase in concentration, and the mucous membrane which is a complex polysaccharide substance is oxidatively decomposed into a low molecular weight compound,
The inventors have come to the knowledge that the concentration limit sludge concentration can be increased by reducing the viscosity, and have completed the present invention.
【０００８】[0008]
【作用】表層部粘質膜の酸化分解、低分子化を行う方法
としては、各種酸化剤を使用すればよいが、この目的の
ためにあえて準備することはやはり経済的な圧迫とな
る。そこで、本発明では、生物処理後に生物処理残留の
ＣＯＤ、色度除去などを目的として適用するオゾン処理
において不可避的に排出される余剰オゾンを利用するも
のであり、膜分離前の汚泥に排出オゾンを吹込むことに
したものであり、余剰オゾンの処理のため従来必要であ
った活性炭処理を大幅縮少（あるいは不要化）するとい
う副次効果も奏することが期待できる。As a method of oxidatively decomposing and lowering the molecular weight of the surface layer viscous film, various oxidants may be used, but it is economically costly to prepare for this purpose. Therefore, in the present invention, surplus ozone that is inevitably discharged in the ozone treatment applied for the purpose of removing COD of biological treatment residue, chromaticity, etc. after biological treatment is used, and the ozone discharged to sludge before membrane separation is used. It is expected that the secondary effect of significantly reducing (or eliminating) the activated carbon treatment that was conventionally required for the treatment of surplus ozone will be achieved.
【０００９】[0009]
【実施例】本発明の一実施例を図１によって説明する。
図１において図２と同一部位には同一符号を付してある
ので、その説明は省略する。図１のフローにおいて図２
のフローと異なる点はオゾン処理装置４から排出される
余剰オゾンの排出オゾンライン１３を設け、このライン
１３を汚泥貯留槽７に連結してある点のみであり、基本
的な廃水、余剰汚泥の流れは図２に関して説明したとお
りである。DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIG.
In FIG. 1, the same parts as those in FIG. 2 are designated by the same reference numerals, and the description thereof will be omitted. 2 in the flow of FIG.
The only difference from the flow is that an ozone line 13 for discharging excess ozone discharged from the ozone treatment device 4 is provided, and this line 13 is connected to the sludge storage tank 7. The flow is as described with reference to FIG.
【００１０】排出オゾンライン１３を経由して汚泥貯留
槽７に吹込まれた余剰オゾンは汚泥貯留槽７に貯留され
た生物余剰汚泥の表層部の粘膜質を酸化分解する。この
ように質的調整を受けた汚泥は濃縮装置８である膜分離
装置（限外ろ過膜あるいは精密ろ過膜を用いた装置）
で、従来方法のような不具合を生じることなく濃縮さ
れ、濃縮汚泥は後段の脱水機９、乾燥機１０において処
理され、最終的に焼却炉１１によって焼却される。一
方、膜分離装置よりなる濃縮装置８で分離された濃縮分
離液は濃縮分離液返送ライン１４を経由して生物処理装
置２に循環される。濃縮装置８において使用される限外
ろ過膜あるいは精密ろ過膜の分画分子量あるいは膜孔径
は対象汚泥の性状に合わせて適宜設定される。Excess ozone blown into the sludge storage tank 7 through the discharged ozone line 13 oxidizes and decomposes the mucosa of the surface layer of the biological surplus sludge stored in the sludge storage tank 7. The sludge thus qualitatively adjusted is a concentrator 8 which is a membrane separator (a device using an ultrafiltration membrane or a microfiltration membrane).
Thus, the concentrated sludge is concentrated without causing the inconvenience of the conventional method, the concentrated sludge is treated in the dehydrator 9 and the dryer 10 in the subsequent stage, and finally incinerated in the incinerator 11. On the other hand, the concentrated separation liquid separated by the concentration device 8 composed of the membrane separation device is circulated to the biological treatment device 2 via the concentrated separation liquid return line 14. The molecular weight cutoff or membrane pore size of the ultrafiltration membrane or microfiltration membrane used in the concentrator 8 is appropriately set according to the properties of the target sludge.
【００１１】以下、本発明の効果を示すための膜分離の
実験装置を図３に示す。図３において、Ａは有効液量３
００ミリリットルの原液（汚泥）貯留槽、Ｂは循環ポン
プ、Ｃは膜分離部、Ｄはポリアクリルニトリル製の蛇行
した溝を切った平膜を合体した限外ろ過膜（有効膜面
積：２８ｍ2 ）、Ｅは濃縮循環液ライン、Ｆは窒素ガス
供給ラインを示す。なお、Ｐは圧力計、Ｔは温度計を示
す。試料液である原液３００ミリリットルを膜分離部Ｃ
での限外ろ過膜Ｄの透過圧力が４ｋｇ／ｃｍ2 になるよ
うに窒素ガスで加圧して原液を限外ろ過させ、膜透過水
量が殆んど得られなくなった状態を濃縮限界とした。An experimental apparatus for membrane separation for showing the effect of the present invention is shown below in FIG. In FIG. 3, A is the effective liquid amount 3
An undiluted solution (sludge) storage tank of 00 ml, B is a circulation pump, C is a membrane separation part, and D is an ultrafiltration membrane (effective membrane area: 28 m 2) made of polyacrylonitrile, which is composed of flat membranes with meandering grooves. ) And E are concentrated circulating liquid lines and F is a nitrogen gas supply line. In addition, P is a pressure gauge and T is a thermometer. 300 ml of the stock solution, which is the sample solution, is added to the membrane separation unit C.
The stock solution was subjected to ultrafiltration by pressurizing with nitrogen gas so that the permeation pressure of the ultrafiltration membrane D in 4 was 4 kg / cm 2, and the state where almost no membrane permeated water was obtained was defined as the concentration limit.
【００１２】図４に実験結果を示す。図４から、排オゾ
ン相当量であるオゾン注入率３０ｐｐｍにおいて、オゾ
ンによる前処理がある場合、ない場合と比較すると濃縮
限界汚泥濃度が高くなっていることが分り、オゾン前処
理の効果が確認された。The experimental results are shown in FIG. From FIG. 4, it can be seen that at the ozone injection rate of 30 ppm, which is equivalent to the amount of discharged ozone, the concentration limit sludge concentration is higher when the pretreatment with ozone is performed and when it is not treated, and the effect of the ozone pretreatment is confirmed. It was
【００１３】[0013]
【発明の効果】本発明によれば、生物処理工程から発生
する余剰汚泥を膜分離により濃縮する際の濃縮率を向上
させることができるばかりでなく、生物処理工程後の高
度処理に適用するオゾン処理後の排出オゾンの有効利用
が図られる効果を奏する。EFFECTS OF THE INVENTION According to the present invention, not only can the concentration rate of surplus sludge generated from a biological treatment process be concentrated by membrane separation, but also ozone applied to advanced treatment after the biological treatment process can be used. This has the effect of effectively utilizing the exhausted ozone after the treatment.
【図１】本発明の一実施例の説明図。FIG. 1 is an explanatory diagram of an embodiment of the present invention.
【図２】従来の汚泥濃縮法の一態様の説明図。FIG. 2 is an explanatory diagram of one embodiment of a conventional sludge concentration method.
【図３】本発明の効果を確認する実験装置の説明図。FIG. 3 is an explanatory diagram of an experimental device for confirming the effects of the present invention.
【図４】本発明の効果を立証する図表。FIG. 4 is a chart demonstrating the effect of the present invention.
Claims (1)
剰汚泥を膜分離により濃縮方法において、膜分離前の汚
泥に、生物処理後の廃水のＣＯＤ、色度除去を行なう高
度処理に適用するオゾン処理後の排出オゾンを吹込むこ
とを特徴とする汚泥濃縮方法。1. In a method for concentrating surplus sludge generated from a biological treatment process of various wastewaters by membrane separation, COD for wastewater after biological treatment and ozone applied to advanced treatment for removing chromaticity in the sludge before membrane separation. A method for concentrating sludge, which comprises blowing in discharged ozone after treatment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23018493A JP3197121B2 (en) | 1993-09-16 | 1993-09-16 | Sludge concentration method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23018493A JP3197121B2 (en) | 1993-09-16 | 1993-09-16 | Sludge concentration method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0780500A true JPH0780500A (en) | 1995-03-28 |
| JP3197121B2 JP3197121B2 (en) | 2001-08-13 |
Family
ID=16903917
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23018493A Expired - Lifetime JP3197121B2 (en) | 1993-09-16 | 1993-09-16 | Sludge concentration method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3197121B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000263093A (en) * | 1999-03-15 | 2000-09-26 | Maezawa Ind Inc | Waste water treatment apparatus |
| JP2019093354A (en) * | 2017-11-24 | 2019-06-20 | 月島機械株式会社 | Sludge concentration equipment and sludge concentration method |
-
1993
- 1993-09-16 JP JP23018493A patent/JP3197121B2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000263093A (en) * | 1999-03-15 | 2000-09-26 | Maezawa Ind Inc | Waste water treatment apparatus |
| JP2019093354A (en) * | 2017-11-24 | 2019-06-20 | 月島機械株式会社 | Sludge concentration equipment and sludge concentration method |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3197121B2 (en) | 2001-08-13 |
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