JPH0716630B2 - Screen-decanter centrifuge - Google Patents
Screen-decanter centrifugeInfo
- Publication number
- JPH0716630B2 JPH0716630B2 JP60098574A JP9857485A JPH0716630B2 JP H0716630 B2 JPH0716630 B2 JP H0716630B2 JP 60098574 A JP60098574 A JP 60098574A JP 9857485 A JP9857485 A JP 9857485A JP H0716630 B2 JPH0716630 B2 JP H0716630B2
- Authority
- JP
- Japan
- Prior art keywords
- sludge
- discharge port
- screw
- separated
- outer cylinder
- 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
- 239000010802 sludge Substances 0.000 claims description 36
- 239000007788 liquid Substances 0.000 claims description 18
- 239000000701 coagulant Substances 0.000 claims description 14
- 238000007790 scraping Methods 0.000 claims description 7
- 238000000926 separation method Methods 0.000 claims description 5
- 238000007599 discharging Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- 229920000620 organic polymer Polymers 0.000 description 5
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 4
- 125000002091 cationic group Chemical group 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 239000010865 sewage Substances 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000010800 human waste Substances 0.000 description 2
- 239000010842 industrial wastewater Substances 0.000 description 2
- 239000013049 sediment Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 229910021578 Iron(III) chloride Inorganic materials 0.000 description 1
- 125000000129 anionic group Chemical group 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 229920006317 cationic polymer Polymers 0.000 description 1
- 239000013065 commercial product Substances 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 230000029087 digestion Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 229920000592 inorganic polymer Polymers 0.000 description 1
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 description 1
- 238000010169 landfilling Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000011550 stock solution Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
Landscapes
- Centrifugal Separators (AREA)
- Treatment Of Sludge (AREA)
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。TECHNICAL FIELD The present invention relates to a screw decanter centrifuge for dewatering organic sludge generated in a process of treating 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と同心に外胴ｂが設けて
あって、外胴ｂ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 centrifuge that has been conventionally used to dehydrate organic sludge generated in the process of treating sewage / human waste and various industrial wastewaters will be described with reference to FIG. An outer case b is provided on the outer side of the cylinder concentrically with the inner case a, and the outer case b is supported by a bearing c so as to rotate at a high speed. A screw d is attached to the outer side of the inner case a, and a feed pipe e is provided on the central axis of the inner case 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、内胴ａ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ｂの内部に入り、外
胴ｂの高速回転による遠心力で汚泥堆積物ｈと分離液ｉ
とに分離される。汚泥堆積物ｈ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ｂの
外に排出され、分離液ｉはオリフィスｋから外胴ｂの外
に排出される。From the right end of the feed pipe e in FIG. 2, aggregated flocs produced by adding a cationic organic polymer condensing agent to the sludge slurry are sent and fall into the chamber f of the inner case a. There is. The flocculated flocs that have fallen into the chamber f enter the inside of the outer casing b from the chamber f through the discharge port g, and are subjected to centrifugal force due to the high-speed rotation of the outer casing b to cause sludge deposit h and the separated liquid i.
And separated. The sludge deposit h is scraped up from the separation liquid i by the screw d, and then discharged from the discharge port j to the outside of the outer case b, and the separation liquid i is discharged from the orifice k to the outside of the outer case b.
上述した従来のスクリューデカンタ型遠心分離機では、
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ｈ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或程度除去されるものの、
かなり高い含有率のまま排出され、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 centrifugal separator described above,
The sludge deposit h, which has been lifted up from the separated liquid i by the screw d, has a certain degree of water content on the particle surface or in the interparticle voids removed by the consolidating action by the centrifugal force.
It had a drawback that it was discharged at a considerably high content rate and the cost of landfilling, drying and incineration to be performed next was increased.
そこで汚泥堆積物の含有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縮剤を添加した後、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、含有率低減の効果は、せいぜい３％程
度にとどまっていた。Therefore, in order to reduce the content of sludge deposits, after adding a cationic polymer condensing agent to the sludge slurry, an inorganic flocculant such as ferric chloride is added, or a cationic and anionic organic polymer is added. After the addition of the two liquids of the coagulant, it may be put in a screw decanter type centrifugal separator, but the effect of reducing the content was 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有率を大巾に低減し、汚泥処理コス
トを少なくしようとするものである。[Problems to be Solved by the Invention] The present invention intends to greatly reduce the content of sludge deposits discharged from a screw decanter centrifuge and reduce 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、汚泥を前記外胴内部に
送る内管と、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且つ外胴に設けられた吐出口
から排出させるスクリューと、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、前記吐出口の近傍位置に設
けられた表層かきとりナイフと、を備えたことを特徴と
する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 relates to an outer shell that rotates at a high speed, an inner tube that feeds sludge into the outer shell, and sludge deposits that have settled and separated in the outer shell from a sludge separation liquid. A screw for scraping and discharging from a discharge port provided in the outer shell, an outer pipe concentrically provided outside the inner pipe for adding an inorganic coagulant to the sludge deposit scraped up from the separated liquid, and A screw decanter type centrifuge, comprising: a surface scraping knife provided in the vicinity of the discharge port.
［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、除去されることになり、更に表層かきと
りナイフにより汚泥堆積物の含有率が大幅に低下する。[Operation] An inorganic coagulant is added and permeated into the sludge deposit scraped up from the separated liquid, and its strong water-excluding power removes the residual water in the sludge deposit, and further the surface scraping knife. This significantly reduces the sludge sediment content.
［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。[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.
第１図において、１は外胴であって、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。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10は、吐出口３に近い外胴１の縮径部に対
向している。In FIG. 1, reference numeral 1 denotes an outer shell, which is supported by a bearing 2 to rotate at a high speed, and is provided with a discharge port 3 and an orifice 4. An inner body 5 is concentrically provided inside the outer body 1, a screw 6 is attached to the outer side of the inner body 5, and chambers 7 and 8 are formed inside the inner body 5. . The chambers 7 and 8 are communicated with the inside of the outer case 1 by the discharge ports 9 and 10. The discharge port 9 faces the large diameter part of the outer case 1, and the discharge port 10 faces the reduced diameter part of the outer case 1 near the discharge port 3.
内胴５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 case 5 and faces the chamber 7. From the right end of FIG. 1 of this inner pipe 11,
A floc 12 produced by adding a cationic organic polymer flocculant to a sludge slurry is 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。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 outer pipe 13 is provided on the outer side of the inner pipe 11 concentrically with the inner pipe 11, and a portion of the outer pipe 13 near the left end in FIG. The inorganic coagulant 16 is supplied to the outer pipe 13 through the 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を通って室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から外胴１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17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 screw decanter type centrifugal separator described above, the floc 12 produced by adding the organic polymer flocculant to the sludge enters the chamber 7 through the inner pipe 11 and enters the outer body 1 through the discharge port 9. To fall. Then, due to the centrifugal force generated by the high speed rotation of the outer case 1, the separated solution 17 and the sludge deposit 18 are separated, and the separated solution 17 is discharged from the orifice 4 to the outer case 1. The sludge deposit 18 is picked up from the separated liquid 17 by the screw 6 and sent to the discharge port 3 inside the outer case 1.
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、さらに吐出
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。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或程度水分が除
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、さらに吐出口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有率がさらに低くなった後、吐
出口３から排出される。The inorganic coagulant 16 such as polyiron sulfate supplied to the outer pipe 13 through the branch pipe 15 enters the chamber 8 through the discharge port 14, and further is discharged from the separated liquid 17 through the discharge port 10. Sludge deposit
Added to 18. Sludge sediment with inorganic coagulant 16 added
18 has already been lifted up from the separated liquid 17 to a certain degree of water content, and has a residual water removal effect due to the chemical action of the inorganic coagulant 16, a compaction effect due to centrifugal force, and a further discharge. The content is further reduced by the effect of the surface layer scraping knife 19 provided in the vicinity of the outlet 3, and then discharged from the discharge port 3.
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い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 following table shows the water content of sludge deposits when polyiron sulfate is added as an inorganic coagulant and when the conventional inorganic coagulant is not added.
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） 運転条件 実験１ 遠心効果1,800G、差速10r.p.m. 液深22.5mm、流量1.0m3/hr. 凝集剤添加量（１）2.13l/min. （２）20ml/min. 実験２ 遠心効果4,000G、差速15.5r.p.m. 液深15.4mm、流量0.5m3/hr. 凝集剤添加量（１）0.67l/min. （２）10ml/min. 上記の表からわかるように、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。 Experimental conditions Dehydrator Screw decanter centrifuge Sludge Sewage anaerobic digestion sludge Flocculant (1) Organic polymer flocculant (cationic) Diamond block KP-201B (0.3% aqueous solution) (2) Inorganic polymer flocculant Polyferric sulfate (stock solution of commercial product) Operating condition Experiment 1 Centrifugal effect 1,800G, differential speed 10r.pm Liquid depth 22.5mm, flow rate 1.0m 3 / hr. Flocculant addition amount (1) 2.13l / min. (2) 20ml / min. Experiment 2 Centrifugal effect 4,000G, differential speed 15.5rpm, liquid depth 15.4mm, flow rate 0.5m 3 / hr. Flocculant addition amount (1) 0.67l / min. (2) 10ml / min. Thus, by adding polyiron sulfate as an inorganic coagulant, the water content of sludge deposits can be increased from 5.0 to
It could be reduced 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
きると共に、表層かきとりナイフの効果により汚泥堆積
物の含水率を大幅に低下させることができる。[Effects of the Invention] In the screw decanter type centrifugal separator of the present invention, since the sludge deposit is scraped from the separated liquid and separated from the separated liquid, the inorganic coagulant is added, and the mixing action by scraping the screw is performed. The reaction efficiency between the inorganic coagulant and the sludge deposit is increased, so that the sludge deposit having a low water content can be obtained, and the water content of the sludge deposit can be significantly reduced by the effect of the surface scraping knife.
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 tube, 13 is an outer tube, 16 is an inorganic coagulant, 17 is a separation liquid, and 18 is a sludge deposit.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 北山 和茂 神奈川県横浜市磯子区新中原町１番地 石 川島播磨重工業株式会社技術研究所内 (56)参考文献 実開 昭60−108357（ＪＰ，Ｕ) 特公 昭41−21877（ＪＰ，Ｂ１) 特公 昭52−16268（ＪＰ，Ｂ２) ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kamo Kitayama 1 Shin-Nakahara-cho, Isogo-ku, Yokohama-shi, Kanagawa Ishi Kawashima Harima Heavy Industries Co., Ltd. Technical Research Institute (56) References ) JP-B-41-21877 (JP, B1) JP-B-52-16268 (JP, B2)
Claims (1)
に送る内管と、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且つ外胴に設けられた吐出
口から排出させるスクリューと、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、前記吐出口の近傍位置に
設けられた表層かきとりナイフと、を備えたことを特徴
とするスクリューデカンタ型遠心分離機。1. An outer cylinder rotating at a high speed, an inner pipe for feeding sludge into the outer cylinder, a sludge deposit settled and separated in the outer cylinder, lifted up from a sludge separation liquid, and provided on the outer cylinder. A screw for discharging from the discharge port, an outer pipe concentrically provided on the outside of the inner pipe for adding an inorganic coagulant to the sludge deposit scraped up from the separated liquid, and a position provided in the vicinity of the discharge port A screw decanter type centrifuge characterized by comprising a surface scraping knife.
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 JPS61257256A (en) | 1986-11-14 |
| JPH0716630B2 true 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 (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102448896A (en) * | 2009-05-18 | 2012-05-09 | 株式会社西原环境 | Centrifugal separation device |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62197199A (en) * | 1986-02-24 | 1987-08-31 | Kyozo Kaneko | Method for dredging laying-up sludge |
| JP5490442B2 (en) * | 2009-05-18 | 2014-05-14 | 株式会社西原環境 | Centrifuge |
| JP5191565B2 (en) * | 2011-02-25 | 2013-05-08 | 寿工業株式会社 | Centrifugal dehydration method and centrifugal dehydration apparatus |
| JP5619965B2 (en) * | 2013-07-01 | 2014-11-05 | 株式会社西原環境 | Centrifuge |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4121877Y1 (en) * | 1965-06-09 | 1966-10-28 | ||
| JPS5822992B2 (en) * | 1975-07-28 | 1983-05-12 | カシオケイサンキ カブシキガイシヤ | Hizukehiyoujisouchi |
-
1985
- 1985-05-09 JP JP60098574A patent/JPH0716630B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102448896A (en) * | 2009-05-18 | 2012-05-09 | 株式会社西原环境 | Centrifugal separation device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61257256A (en) | 1986-11-14 |
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