JPS61257256A - Screw decanter type centrifugal separator - Google Patents
Screw decanter type centrifugal separatorInfo
- Publication number
- JPS61257256A JPS61257256A JP60098574A JP9857485A JPS61257256A JP S61257256 A JPS61257256 A JP S61257256A JP 60098574 A JP60098574 A JP 60098574A JP 9857485 A JP9857485 A JP 9857485A JP S61257256 A JPS61257256 A JP S61257256A
- Authority
- JP
- Japan
- Prior art keywords
- sludge
- deposit
- screw
- separated liquid
- discharge port
- 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
- Treatment Of Sludge (AREA)
- Centrifugal Separators (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は、下水・し尿・各種産業廃水処理工程で発生す
る有機性汚泥を脱水するためのスクリューデカンタ型遠
心分離機に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a screw decanter type centrifugal separator for dewatering organic sludge generated in sewage, human waste, and various industrial wastewater treatment processes.
［従来の技術］
下水・し尿・各種産業廃水処理工程で発生する有機性汚
泥を脱水するため、従来から使用されているスクリュー
デカンタ型遠心分離機の一例を第２図について説明する
と、内胴ａの外側には、内胴ａと同心に外Ｗ４ｂが設け
てあって、外胴すは軸受Ｃに支持されて高速で回転する
ようになっている。内胴ａの外側にはスクリューｄが取
付けられており、内胴ａの中心軸線上には、フィードパ
イプｅが設けられている。[Prior Art] An example of a screw decanter type centrifugal separator conventionally used for dewatering organic sludge generated in sewage, human waste, and various industrial wastewater treatment processes is explained with reference to Fig. 2. An outer shell W4b is provided concentrically with the inner shell a, and the outer shell is supported by a bearing C to rotate at high speed. A screw d is attached to the outside of the inner shell a, and a feed pipe e is provided on the central axis of the inner shell a.
フィードパイプｅの第２図における右端からは、汚泥ス
ラリーにカチオン系有機高分子凝縮剤を添加して生成し
た凝集フロックが送られて来て、内ｌ１Ｉａの室ｆに落
下するようになっている。室ｆ内に落下した凝集フロッ
クは、室ｆから吐出口ｇを通って外胴すの内部に入り、
外胴すの高速回転による遠心力で汚泥堆積物りと分離液
１とに分離される。汚泥堆積物りはスクリューｄによっ
て分離液ｉからかき上げられた後、吐出口ｊから外胴す
の外に排出され、分離液ｉはオリフィスｋから外胴すの
外に排出される。From the right end of the feed pipe e in Figure 2, flocs produced by adding a cationic organic polymer condensing agent to the sludge slurry are sent and fall into chamber f of l1Ia. . The agglomerated flocs that have fallen into the chamber f enter the inside of the outer shell from the chamber f through the discharge port g,
The sludge deposits are separated into the separated liquid 1 by the centrifugal force caused by the high speed rotation of the outer shell. After the sludge deposits are scraped up from the separated liquid i by the screw d, they are discharged from the discharge port j to the outside of the outer shell, and the separated liquid i is discharged from the orifice k to the outside of the outer shell.
上述した従来のスクリューデカンタ型蓮心分離線では、
スクリューｄによって分離液ｉからかき上げられた汚泥
堆積物りは、遠心力による圧密作用で、粒子表面あるい
は粒子間空隙内にある水分は成程度除去されるものの、
かなり高い含水率のまま排出され、次に行なわれる埋立
、乾燥、焼却の処理コストを大きくしている欠点があっ
た。In the conventional screw decanter type lotus heart separation line mentioned above,
The sludge deposits scraped up from the separated liquid i by the screw d are compacted by the centrifugal force, and although some moisture on the particle surfaces or in the interparticle spaces is removed,
The problem is that the waste is discharged with a fairly high moisture content, increasing the cost of subsequent landfilling, drying, and incineration.
そこで汚泥堆積物の含水率を低下させるため、汚泥スラ
リーにカチオン系高分子凝集剤を添加した後、塩化第二
鉄等の無機凝集剤を添加したり、あるいはカチオン系と
アニオン系の有機高分子凝集剤の２液を添加した後、ス
クリューデカンタ型遠心分離機に入れることが行なわれ
ることもあるが、含水率低減の効果は、せいぜい３％程
度にとどまっていた。Therefore, in order to reduce the water content of sludge deposits, a cationic polymer flocculant is added to the sludge slurry, and then an inorganic flocculant such as ferric chloride is added, or a cationic and anionic organic polymer is added to the sludge slurry. After adding two flocculant liquids, the mixture is sometimes placed in a screw decanter type centrifuge, but the effect of reducing the water content has been limited to about 3% at most.
［発明が解決しようとする問題点］
本発明は、スクリューデカンタ型遠心分離機から排出さ
れる汚泥堆積物の含水率を大巾に低減し、汚泥処理コス
トを少なくしようとするものでおる。[Problems to be Solved by the Invention] The present invention aims to significantly reduce the water content of sludge deposits discharged from a screw decanter centrifuge, thereby reducing sludge treatment costs.
［問題点を解決するための手段］
本°発明は、高速回転する外胴と、汚泥を外胴内部に送
る内管と、外胴内部で沈降分離した汚泥堆積物を汚泥の
分離液からかき上げるスクリューと、内管の外側に同心
に設けられ分離液からかき上げられた汚泥堆積物に無機
凝集剤を添加する外管と、を備えたスクリューデカンタ
型遠心分離機としたものである。[Means for Solving the Problems] The present invention comprises an outer shell that rotates at high speed, an inner pipe that sends sludge into the outer shell, and a system that scrapes the sludge deposits that have settled and separated inside the outer shell from the sludge separated liquid. This is a screw decanter type centrifugal separator equipped with a lifting screw and an outer tube that is provided concentrically outside the inner tube and adds an inorganic flocculant to the sludge deposits scraped up from the separated liquid.
［作 用］
分離液からかき上げられた汚泥堆積物に無機凝集剤が添
加浸透し、その強力な水分排除力により、汚泥堆積物中
の残留水分が、さらに除去されることになる。[Function] The inorganic flocculant is added and permeates into the sludge deposit scraped up from the separated liquid, and its strong water removal ability further removes residual water in the sludge deposit.
［実 施 例］ 以下、本発明の一実施例を、図面を参照して説明する。[Example] An embodiment of the present invention will be described below with reference to the drawings.
第１図において、１は外用であって、軸受２に支持され
て高速回転するようになっており、吐出口３とオリフィ
ス４とが設けられている。In FIG. 1, reference numeral 1 is for external use, and is supported by a bearing 2 to rotate at high speed, and is provided with a discharge port 3 and an orifice 4.
外胴１の内部には、同心に内胴５が設けてあって、内胴
５の外側にはスクリュー６が取付け・られており、内胴
５の内部には室７．８が形成されている。そして室７，
８は、吐出口９，１０によって外胴１の内部に連通され
ている。吐出口９は外胴１の大径部に対向し、吐出口１
０は、吐出口３に近い外胴１の縮径部に対向している。An inner shell 5 is provided concentrically inside the outer shell 1, a screw 6 is attached to the outside of the inner shell 5, and a chamber 7.8 is formed inside the inner shell 5. There is. And room 7,
8 communicates with the inside of the outer shell 1 through discharge ports 9 and 10. The discharge port 9 faces the large diameter part of the outer shell 1, and the discharge port 1
0 faces the reduced diameter portion of the outer shell 1 near the discharge port 3.
内ｌ１ｉ５の中心軸線上には内管１１が設けてあって、
室７に臨んでいる。この内管１１の第１図における右端
からは、汚泥スラリーにカチオン系有機高分子凝集剤を
添加して生成した凝集フロック１２が送られて来るよう
になっている。An inner tube 11 is provided on the central axis of the inner l1i5,
I'm facing room 7. From the right end of this inner tube 11 in FIG. 1, coagulated flocs 12 produced by adding a cationic organic polymer flocculant to the sludge slurry are sent.
内管１１の外側には、内管１１と同心に外管１３が設け
てあって、外管１３の第１図における左端近くは、排出
口１４によって室８に連通している。Outside the inner tube 11, an outer tube 13 is provided concentrically with the inner tube 11, and a portion near the left end of the outer tube 13 in FIG. 1 communicates with the chamber 8 through a discharge port 14.
外管１３には、枝管１５を介して無機凝集剤１６が供給
されるようになっている。An inorganic flocculant 16 is supplied to the outer pipe 13 via a branch pipe 15.
上述したスクリューデカンタ型遠心分離機において、汚
泥に有機高分子凝集剤を添加して生成された凝集フロッ
ク１２は、内管１１を通って至７に入り、吐出口９から
外胴１の内部に落下する。そして外胴１の高速回転によ
る遠心力により、゛分離液１７と汚泥堆積物１８とに分
離され、分離液１７は、オリフィス４から外Ｗ４１に排
出される。汚泥堆積物１８は、スクリュー６によって分
離液１１からかき上げられ、外胴１内を吐出口３の方に
送られる。In the above-mentioned screw decanter type centrifuge, the flocs 12 generated by adding an organic polymer flocculant to the sludge enter the tube 7 through the inner pipe 11 and enter the inside of the outer shell 1 from the discharge port 9. Fall. Then, due to the centrifugal force caused by the high speed rotation of the outer shell 1, the separated liquid 17 and the sludge deposit 18 are separated, and the separated liquid 17 is discharged from the orifice 4 to the outside W41. The sludge deposit 18 is scraped up from the separated liquid 11 by the screw 6 and sent inside the outer shell 1 toward the discharge port 3.
枝管１５を介して外管１３内に供給されたポリ硫酸鉄等
の無機凝集剤１６は、排出口１４より室８内に入り、ざ
らに吐出口１０を通って、分離液１７からかき上げられ
た汚泥堆積物１８に添加される。The inorganic flocculant 16 such as polyferric sulfate supplied into the outer pipe 13 via the branch pipe 15 enters the chamber 8 through the discharge port 14, roughly passes through the discharge port 10, and is scraped up from the separated liquid 17. sludge pile 18.
無機凝集剤１６が添加された汚泥堆積物１８は、既に分
離液１７からかき上げられて成程度水分が除去された状
態になっており、これに無機凝集剤１６の化学作用によ
る残留水分除去作用と、遠心力による圧密作用と、ざら
に吐出口３近傍に設けられた表層かきとりナイフ１９の
効果とによって含水率がざらに低くなった後、吐出口３
から排出される。The sludge deposit 18 to which the inorganic flocculant 16 has been added has already been scraped up from the separated liquid 17 and a certain amount of water has been removed. Then, after the moisture content has been reduced to a rough level due to the compaction effect caused by centrifugal force and the effect of the surface layer scraping knife 19 provided roughly near the discharge port 3,
is discharged from.
無機凝集剤としてポリ硫酸鉄を添加した場合と、従来の
ように無機凝集剤を添加しなσ）場合との汚泥堆積物の
含水率は、次の表に示すようになる。The water content of sludge deposits when polyferric sulfate was added as an inorganic flocculant and when no inorganic flocculant was added as in the past are shown in the following table.
実験条件
脱水機 スクリューデカンタ型遠心分離機゛ 汚
泥 下水嫌気性消化汚泥
凝集剤 （１）有機高分子凝集剤（カチオン系）ダイヤ
ブロックＫＰ−２０１Ｂ
（０，３％水溶液）
（２）無機高分子凝集剤
ポリ硫酸鉄（市販品原液）
へ
運転条件
実験１
遠心効果１，８００Ｇ、差速１０ｒ、 ｌ）、 ＩＩＩ
。Experimental conditions Dehydrator Screw decanter type centrifuge
Sludge Sewage anaerobic digestion sludge flocculant (1) Organic polymer flocculant (cationic) Diablock KP-201B (0.3% aqueous solution) (2) Inorganic polymer flocculant polyferric sulfate (commercial product stock solution) Condition experiment 1 Centrifugal effect 1,800G, differential speed 10r, l), III
.
液深２２．５ｍｍ、流１１ｉ １．０ｉ”／ｈｒ。Liquid depth 22.5mm, flow 11i 1.0i”/hr.
凝集剤添加量 （１） ２．１３１ ／ｍｉｎ。Coagulant addition amount (1) 2.131/min.
（２） ２０ｉｉ／ｍｉｎ。(2) 20ii/min.
実験２ 遠心効果４．０ＯＯＧ、差速１５．５ｒ、 ｐ、 ｍ。Experiment 2 Centrifugal effect 4.0OOG, differential speed 15.5r, p, m.
液深１５．５ｍｍ、流量０．５ｍｌ／ｈｒ。Liquid depth 15.5mm, flow rate 0.5ml/hr.
凝集剤添加量（１） ０．６７ｆ／ｍｉｎ。Coagulant addition amount (1) 0.67 f/min.
（２） １０ｙｆ／ｍｉｎ。(2) 10yf/min.
上記の表かられかるように、無機凝集剤としてポリ硫酸
鉄を添加することにより、汚泥堆積物の含水率を５．０
〜５．５％低減させることができた。As can be seen from the table above, by adding polyferric sulfate as an inorganic flocculant, the water content of sludge deposits can be reduced to 5.0.
It was possible to reduce it by ~5.5%.
［発明の効果］
本発明のスクリューデカンタ型遠心分離機は、汚泥堆積
物を分離液からかき上げて分離液から分けた後に無機凝
集剤を添加し、スクリューのかき出しによる混合作用が
行なわれるので、無機凝集剤と汚泥堆積物との反応効率
が大きくなり、含水率の低い汚泥堆積物を得ることがで
きる。[Effects of the Invention] The screw decanter type centrifugal separator of the present invention adds an inorganic flocculant after sludge deposits are scraped up from the separated liquid and separated from the separated liquid, and the mixing action is performed by scraping the screw. The efficiency of the reaction between the inorganic flocculant and the sludge deposit increases, making it possible to obtain a sludge deposit with a low water content.
第１図は本発明の一実施例の断面図、第２図は従来装置
の断面図である。
図中、１は外胴、６はスクリュー、１１は内管、１３は
外管、１６は無機凝集剤、１７は分離液、１８は汚泥堆
積物を示す。FIG. 1 is a sectional view of an embodiment of the present invention, and FIG. 2 is a sectional view of a conventional device. In the figure, 1 is an outer shell, 6 is a screw, 11 is an inner pipe, 13 is an outer pipe, 16 is an inorganic flocculant, 17 is a separated liquid, and 18 is a sludge deposit.
Claims (1)
管と、前記外胴内部で沈降分離した汚泥堆積物を汚泥の
分離液からかき上げるスクリューと、前記内管の外側に
同心に設けられ前記分離液からかき上げられた汚泥堆積
物に無機凝集剤を添加する外管と、を備えたことたを特
徴とするスクリューデカンタ型遠心分離機。1) An outer shell that rotates at high speed, an inner pipe that sends sludge into the outer shell, a screw that scrapes up sludge deposits that have settled and separated inside the outer shell from the sludge separation liquid, and a screw that is concentric with the outside of the inner pipe. A screw decanter type centrifugal separator, comprising: an outer tube for adding an inorganic flocculant to the sludge deposit scraped up from the separated liquid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60098574A JPH0716630B2 (en) | 1985-05-09 | 1985-05-09 | Screen-decanter centrifuge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60098574A JPH0716630B2 (en) | 1985-05-09 | 1985-05-09 | Screen-decanter centrifuge |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61257256A true JPS61257256A (en) | 1986-11-14 |
| JPH0716630B2 JPH0716630B2 (en) | 1995-03-01 |
Family
ID=14223439
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60098574A Expired - Lifetime JPH0716630B2 (en) | 1985-05-09 | 1985-05-09 | Screen-decanter centrifuge |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0716630B2 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62197199A (en) * | 1986-02-24 | 1987-08-31 | Kyozo Kaneko | Method for dredging laying-up sludge |
| JP2010264417A (en) * | 2009-05-18 | 2010-11-25 | Nishihara Environment Technology Inc | Centrifugal separation apparatus |
| JP2010264419A (en) * | 2009-05-18 | 2010-11-25 | Nishihara Environment Technology Inc | Centrifugal separation apparatus |
| JP2013188751A (en) * | 2013-07-01 | 2013-09-26 | Nishihara Environment Co Ltd | Centrifugal separating device |
| US20130337991A1 (en) * | 2011-02-25 | 2013-12-19 | Kotobuki Industries Co., Ltd. | Centrifugal dehydration method and centrifugal dehydration device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4121877Y1 (en) * | 1965-06-09 | 1966-10-28 | ||
| JPS5216268A (en) * | 1975-07-28 | 1977-02-07 | Casio Comput Co Ltd | Data indicating apparatus |
-
1985
- 1985-05-09 JP JP60098574A patent/JPH0716630B2/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4121877Y1 (en) * | 1965-06-09 | 1966-10-28 | ||
| JPS5216268A (en) * | 1975-07-28 | 1977-02-07 | Casio Comput Co Ltd | Data indicating apparatus |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62197199A (en) * | 1986-02-24 | 1987-08-31 | Kyozo Kaneko | Method for dredging laying-up sludge |
| JP2010264417A (en) * | 2009-05-18 | 2010-11-25 | Nishihara Environment Technology Inc | Centrifugal separation apparatus |
| JP2010264419A (en) * | 2009-05-18 | 2010-11-25 | Nishihara Environment Technology Inc | Centrifugal separation apparatus |
| US20130337991A1 (en) * | 2011-02-25 | 2013-12-19 | Kotobuki Industries Co., Ltd. | Centrifugal dehydration method and centrifugal dehydration device |
| US9364837B2 (en) * | 2011-02-25 | 2016-06-14 | Kotobuki Industries Co., Ltd. | Centrifugal dehydration method and centrifugal dehydration device |
| JP2013188751A (en) * | 2013-07-01 | 2013-09-26 | Nishihara Environment Co Ltd | Centrifugal separating device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0716630B2 (en) | 1995-03-01 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |