JPH0966299A - Two-stage chemical injection type centrifugal dehydrator - Google Patents
Two-stage chemical injection type centrifugal dehydratorInfo
- Publication number
- JPH0966299A JPH0966299A JP7223408A JP22340895A JPH0966299A JP H0966299 A JPH0966299 A JP H0966299A JP 7223408 A JP7223408 A JP 7223408A JP 22340895 A JP22340895 A JP 22340895A JP H0966299 A JPH0966299 A JP H0966299A
- Authority
- JP
- Japan
- Prior art keywords
- bowl
- centrifugal dehydrator
- chemical injection
- coagulant
- stage chemical
- 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.)
- Pending
Links
Landscapes
- Centrifugal Separators (AREA)
- Treatment Of Sludge (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は凝集剤の注入構造に
改良を加えた遠心脱水機に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a centrifugal dehydrator having an improved coagulant injection structure.
【０００２】[0002]
【従来の技術】円筒部と円錐部からなるボウルと、同ボ
ウル内に同軸心に入れられたスクリューコンベアとを水
平に配置した２つの軸受間に支持し、同ボウルの高速回
転による遠心力で固液分離を行わせるように構成した遠
心脱水機が知られている。2. Description of the Related Art A bowl composed of a cylindrical portion and a conical portion, and a screw conveyer coaxially placed in the bowl are supported between two horizontally arranged bearings, and centrifugal force generated by the high speed rotation of the bowl is supported. Centrifugal dehydrators configured to perform solid-liquid separation are known.
【０００３】この遠心脱水機への給泥及び薬注はスクリ
ューコンベア軸心より給泥用パイプ及び薬注用パイプを
通し、それぞれ適当と考えられるボウル内位置へ行って
いる。従来は、薬注用パイプが１本であり、機内では一
段薬注のみしか実施されていない。Mud supply and chemical injection to this centrifugal dehydrator are carried out from the axial center of the screw conveyor through the mud supply pipe and chemical injection pipe to respective positions in the bowl which are considered to be appropriate. Conventionally, only one chemical injection pipe is used, and only one-step chemical injection is performed in the machine.
【０００４】[0004]
【発明が解決しようとする課題】一般的に、下水処理場
等で発生する下水汚泥を脱水処理する場合、汚泥に高分
子系凝集剤を注入して凝集フロックを作り、或る程度固
液分離した後に、汚泥に無機凝集剤を添加すれば、ベル
トプレス型脱水機等で実証されているように、より効果
的な脱水が行なえることがわかっている。In general, when dewatering sewage sludge generated in a sewage treatment plant, etc., a polymer flocculant is injected into sludge to form floc, and solid-liquid separation is performed to some extent. After that, it is known that if an inorganic coagulant is added to the sludge, more effective dewatering can be performed as demonstrated by a belt press type dewatering machine or the like.
【０００５】しかし、従来の遠心脱水機においては、遠
心力の強さやボウルとスクリューの回転差速等の機械的
な因子のみが注目されて開発が行なわれ、薬注方法につ
いては改善がなされていない。この為、充分に脱水の効
果が得られていなかった。However, in the conventional centrifugal dehydrator, only mechanical factors such as the strength of centrifugal force and the rotational speed difference between the bowl and the screw have been paid attention to the development, and the chemical injection method has been improved. Absent. Therefore, the effect of dehydration was not sufficiently obtained.
【０００６】本発明は、従来の遠心脱水機と開発の発想
を変え、高分子系凝集剤と無機系凝集剤など２種類の凝
集剤を機内の異った位置に注入可能に構成し、低含水率
に脱水のできる遠心脱水機を提供するものである。The present invention changes the idea of development from the conventional centrifugal dehydrator, and is constructed so that two types of coagulants such as a polymer type coagulant and an inorganic coagulant can be injected into different positions in the machine, It is intended to provide a centrifugal dehydrator capable of dehydrating to a water content rate.
【０００７】[0007]
【課題を解決するための手段】本発明は前記課題を解決
するため、遠心脱水機のボウル内に給泥と一段目薬注の
他に、二段目薬注を行えるようにすることにより、従来
実施されていた給泥、一段目薬注のみに比べ凝集効果と
遠心力効果が相乗されるようにして脱水率の向上が計れ
るようにしたものである。In order to solve the above-mentioned problems, the present invention has been carried out in the prior art by enabling a second-stage chemical injection in addition to a mud supply and a first-stage chemical injection in the bowl of a centrifugal dehydrator. The coagulation effect and centrifugal force effect are synergized in comparison with the conventional mud supply and the first-stage chemical injection alone so that the dehydration rate can be improved.
【０００８】凝集フロックの破壊を防止する為、給泥と
薬注は、ボウル内に投入される前に出来る限り混合しな
いようそれぞれ別々の供給パイプにてボウル内に投入す
る必要がある。そのため、本発明による遠心脱水機で
は、ボウル内に軸方向に離れた位置に異る凝集剤を注入
する２系統の凝集剤注入用パイプを汚泥供給管内に配設
した構成を採用する。In order to prevent the flocculation flocs from being destroyed, it is necessary to feed the mud and the chemicals into the bowl with separate feed pipes so that they are not mixed as much as possible before being put into the bowl. Therefore, the centrifugal dehydrator according to the present invention employs a configuration in which two systems of coagulant injection pipes for injecting different coagulant agents at axially separated positions are provided in the sludge supply pipe.
【０００９】このように構成した本発明の遠心脱水機に
おいて、高速回転しているボウル内に汚泥供給管より汚
泥を供給するとともに、２系統の凝集剤注入用パイプの
一方から一段目薬注を行う。これによって汚泥は凝集さ
れ遠心力により固液分離され、さらにボウルとスクリュ
ーとの回転差により濾液と凝集フロックとに分けられ、
凝集フロックは徐々にケーキ出口へ移送されると共に濃
縮される。In the centrifugal dehydrator of the present invention thus constructed, the sludge is supplied from the sludge supply pipe into the bowl which is rotating at a high speed, and the first-stage chemical injection is performed from one of the two coagulant injection pipes. . As a result, the sludge is aggregated and solid-liquid separated by centrifugal force, and further separated into the filtrate and the floc by the difference in rotation between the bowl and the screw,
Aggregated flocs are gradually transferred to the cake outlet and concentrated.
【００１０】この状態で、もう一方の凝集剤注入用パイ
プから二段目薬注されると、凝集フロックはさらに固液
分離し易い強固なフロックとなり、排出部に向けスクリ
ューにて移送される間に圧密され、脱水されたケーキと
なって機外へ排出される。In this state, when the second-stage chemical is injected from the other coagulant injection pipe, the coagulated flocs become strong flocs that are more easily separated into solid and liquid, and are transferred to the discharge part by the screw. The cake is compacted and dehydrated and discharged outside the machine.
【００１１】[0011]
【発明の実施の形態】次に、本発明の実施の一形態によ
る二段薬注式遠心脱水機について説明する。まず、図２
によって遠心脱水機の全体構造を説明する。図２におい
て、架台２９の上に防振装置２７を介して本体を置き、
本体は本体フレーム２５上にボウル駆動装置２１、コン
ベアスクリュー駆動装置２２、駆動ベルト２８、軸受２
３、減速機２４、ボウルカバー２６を設置してある。BEST MODE FOR CARRYING OUT THE INVENTION Next, a two-stage chemical injection type centrifugal dehydrator according to an embodiment of the present invention will be described. First, FIG.
The entire structure of the centrifugal dehydrator will be described below. In FIG. 2, the main body is placed on the mount 29 via the vibration isolator 27,
The main body includes a bowl drive device 21, a conveyor screw drive device 22, a drive belt 28, and a bearing 2 on a main body frame 25.
3, a speed reducer 24, and a bowl cover 26 are installed.
【００１２】ボウルカバー２６の中にはボウル及びスク
リューコンベアを入れ、それぞれ、駆動装置２１及び２
２で脱水に最適な差速を設けながら高速回転を行う。汚
泥、一段目薬注、二段目薬注は凝集剤注入管３０より機
内に注入される。A bowl and a screw conveyor are placed in the bowl cover 26, and drive devices 21 and 2 are respectively installed.
At 2, the high speed rotation is performed while providing the optimum differential speed for dehydration. The sludge, the first-stage chemical injection, and the second-stage chemical injection are injected into the machine through the coagulant injection pipe 30.
【００１３】次に、ボウルカバー２６内に入れられたボ
ウル及びスクリューコンベアの構造を図１によって説明
する。図１において、１は円筒部と円錐部からなるボウ
ルでこのボウル１内には同軸心にスクリューコンベア２
が入れられ、水平に配置した２つの軸受２３によって回
転自在に支持されている。３は汚泥供給管で、この汚泥
供給管３の内部には高分子系凝集剤注入用パイプ４と無
機系凝集剤注入用パイプ５が配設されている。Next, the structures of the bowl and the screw conveyor put in the bowl cover 26 will be described with reference to FIG. In FIG. 1, reference numeral 1 denotes a bowl composed of a cylindrical portion and a conical portion, and the screw conveyor 2 is coaxially arranged in the bowl 1.
And is rotatably supported by two horizontally arranged bearings 23. Reference numeral 3 denotes a sludge supply pipe. Inside the sludge supply pipe 3, a polymer type coagulant injection pipe 4 and an inorganic type coagulant injection pipe 5 are arranged.
【００１４】このように構成された遠心脱水機におい
て、ボウル１とスクリューコンベア２が高速回転してい
るとき、汚泥供給管３により汚泥を、また高分子系凝集
剤注入用パイプ４により一段目薬注を実施し高分子系凝
集剤６を注入する。このとき汚泥は凝集され遠心力によ
り固液分離され、さらにボウル１とスクリューコンベア
２との回転差により濾液８と凝集フロック９とに分けら
れる。In the centrifugal dehydrator thus constructed, when the bowl 1 and the screw conveyor 2 are rotating at high speed, sludge is supplied by the sludge supply pipe 3 and the first-stage chemical injection is made by the polymer coagulant injection pipe 4. Then, the polymer-based coagulant 6 is injected. At this time, the sludge is agglomerated and solid-liquid separated by centrifugal force, and further separated into a filtrate 8 and an agglomerate floc 9 due to a difference in rotation between the bowl 1 and the screw conveyor 2.
【００１５】凝集フロック９は徐々にケーキ出口へ移送
されると共に濃縮される。ここで無機系凝集剤注入用パ
イプ５により二段目薬注である無機系凝集剤７の注入が
なされると、凝集フロック９はさらに固液分離し易い強
固なフロックとなり、ボウル１の円錐部のビーチ部１１
から排出部１２に向けスクリューにて移送される間に圧
密され、脱水されたケーキ１０となって機外へ排出され
る。濾液はケーキ出口と反対側の濾液出口より機外へ排
出される。The aggregated flocs 9 are gradually transferred to the cake outlet and concentrated. When the inorganic flocculant injection pipe 5 is used to inject the inorganic flocculant 7, which is the second-stage chemical injection, the floc 9 becomes a solid floc that facilitates solid-liquid separation. Beach section 11
The cake 10 is compacted and dehydrated while being transferred from the to the discharge section 12 by a screw, and discharged to the outside of the machine. The filtrate is discharged out of the machine through the filtrate outlet on the side opposite to the cake outlet.
【００１６】[0016]
【発明の効果】以上説明したように、本発明の遠心脱水
機においては、ボウル内の軸方向に離れた位置に異る凝
集剤を注入する２系統の凝集剤注入用パイプを汚泥供給
管内に配設しボウル内の適当と考えられる位置に別個に
異る凝集剤を注入する二段薬注式に構成しているので、
従来の一段薬注に比べ脱水ケーキの含水率が３％以上低
減し、この低減によりケーキ量も減量する。As described above, in the centrifugal dehydrator of the present invention, two coagulant injection pipes for injecting different coagulant at different axial positions in the bowl are provided in the sludge supply pipe. Since it is configured as a two-stage chemical injection type in which different coagulants are separately injected into positions considered to be appropriate in the bowl,
The water content of the dehydrated cake is reduced by 3% or more compared to the conventional one-step chemical injection, and this reduction also reduces the amount of cake.
【００１７】この結果、ケーキの搬送が容易になり貯留
ホッパ容量も小さくできる。また、後処理について、埋
立処分の場合、処理（搬送）費用が低減でき、焼却処分
の場合、ケーキ量の減量と低含水率により燃料費が大巾
に低減できる。As a result, the cake can be easily transported and the storage hopper capacity can be reduced. Regarding post-treatment, in the case of landfill disposal, the processing (transportation) cost can be reduced, and in the case of incineration disposal, the fuel cost can be greatly reduced due to the reduction of the cake amount and the low water content.
【００１８】以上の如く、脱水ケーキの低水分比はケー
キ減量による処分費の低減及び焼却処分の際の燃料費節
約によるランニングコストの低減に結び付き、大きなコ
ストメリットを生ずる。As described above, the low water content ratio of the dehydrated cake leads to a reduction in the disposal cost due to the reduction of the cake and a reduction in the running cost due to the saving of the fuel cost at the time of incineration, resulting in a great cost merit.
【図１】本発明の実施の一形態に係る遠心脱水機の断面
図。FIG. 1 is a sectional view of a centrifugal dehydrator according to an embodiment of the present invention.
【図２】遠心脱水機の全体構成を示す図面で（ａ）は平
面図、（ｂ）は側面図、（ｃ）は（ａ）図の右側面図。2A is a plan view, FIG. 2B is a side view, and FIG. 2C is a right side view of FIG.
１ ボウル ２ スクリューコンベア ３ 汚泥供給管 ４ 高分子系凝集剤注入用パイプ ５ 無機系凝集剤注入用パイプ ６ 高分子系凝集剤 ７ 無機系凝集剤 ８ 濾液 ９ 凝集フロック １０ ケーキ １１ ビーチ部 １２ 排出部 ２１，２２ 駆動装置 ２３ 軸受 ２４ 減速機 ２５ 本体フレーム ２６ ボウルカバー ２７ 防振装置 ２８ 駆動ベルト ２９ 架台 ３０ 凝集剤注入管 1 Bowl 2 Screw Conveyor 3 Sludge Supply Pipe 4 Polymer Coagulant Injection Pipe 5 Inorganic Coagulant Injection Pipe 6 Polymer Coagulant 7 Inorganic Coagulant 8 Filtrate 9 Coagulation Flock 10 Cake 11 Beach Part 12 Discharge Part 21, 22 Drive device 23 Bearing 24 Reducer 25 Main body frame 26 Bowl cover 27 Anti-vibration device 28 Drive belt 29 Frame 30 Flocculant injection pipe
Claims (1)
と円錐部からなるボウルと、同ボウル内に同軸心に入れ
られたスクリューコンベアとを支持し、同ボウルの高速
回転による遠心力で固液分離を行わせるように構成した
遠心脱水機において、前記ボウル内の軸方向に離れた位
置に異る凝集剤を注入する２系統の凝集剤注入用パイプ
を汚泥供給管内に配設したことを特徴とする二段薬注式
遠心脱水機。1. A bowl composed of a cylindrical portion and a conical portion and a screw conveyer coaxially placed in the bowl are supported between two horizontally arranged bearings, and centrifugal force generated by high speed rotation of the bowl is supported. In the centrifugal dehydrator configured to perform solid-liquid separation by means of the above, two systems of coagulant injection pipes for injecting different coagulant at different axial positions in the bowl are provided in the sludge supply pipe. A two-stage chemical injection type centrifugal dehydrator characterized in that.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7223408A JPH0966299A (en) | 1995-08-31 | 1995-08-31 | Two-stage chemical injection type centrifugal dehydrator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7223408A JPH0966299A (en) | 1995-08-31 | 1995-08-31 | Two-stage chemical injection type centrifugal dehydrator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0966299A true JPH0966299A (en) | 1997-03-11 |
Family
ID=16797682
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7223408A Pending JPH0966299A (en) | 1995-08-31 | 1995-08-31 | Two-stage chemical injection type centrifugal dehydrator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0966299A (en) |
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR19990083738A (en) * | 1999-07-10 | 1999-12-06 | 박재덕 | Horizontal series-type double acceleration centrifugal |
| JP2007152406A (en) * | 2005-12-06 | 2007-06-21 | Kobelco Eco-Solutions Co Ltd | Screw press |
| JP2008290142A (en) * | 2007-05-28 | 2008-12-04 | Kobelco Eco-Solutions Co Ltd | Screw press |
| WO2009149373A3 (en) * | 2008-06-06 | 2010-03-11 | M-I L.L.C. | Dual feed centrifuge |
| WO2010134310A1 (en) * | 2009-05-18 | 2010-11-25 | 株式会社西原環境テクノロジー | Centrifugal separation device |
| WO2010134309A1 (en) * | 2009-05-18 | 2010-11-25 | 株式会社西原環境テクノロジー | Centrifugal separation device |
| JP2012011300A (en) * | 2010-06-30 | 2012-01-19 | Nishihara Environment Co Ltd | Centrifugal separation apparatus and sludge treatment method |
| JP2012115814A (en) * | 2010-12-03 | 2012-06-21 | Tomoe Engineering Co Ltd | Centrifugal separator and sludge dehydration method |
| JP2013000662A (en) * | 2011-06-16 | 2013-01-07 | Tsukishima Kikai Co Ltd | Centrifugal separator |
| JP2013158747A (en) * | 2012-02-08 | 2013-08-19 | Nishihara Environment Co Ltd | Sludge dehydration system |
| JP2013188751A (en) * | 2013-07-01 | 2013-09-26 | Nishihara Environment Co Ltd | Centrifugal separating device |
| JP2014200717A (en) * | 2013-04-02 | 2014-10-27 | 株式会社西原環境 | Solid-liquid separation apparatus and solid-liquid separation method |
| JP2015033695A (en) * | 2014-10-17 | 2015-02-19 | 月島機械株式会社 | Centrifugal separator |
| JP2019081174A (en) * | 2019-02-15 | 2019-05-30 | 月島機械株式会社 | Treatment apparatus and process for organic waste |
| JP2019118853A (en) * | 2017-12-28 | 2019-07-22 | 水ｉｎｇ株式会社 | Method for dewatering organic sludge, treatment apparatus used for dewatering organic sludge, and organic coagulant |
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| JPH01189358A (en) * | 1988-01-25 | 1989-07-28 | Pennwalt Corp | Sludge dehydration method and apparatus using decanter type centrifugal separator |
| JPH02160063A (en) * | 1988-12-08 | 1990-06-20 | Pennwalt Corp | Method and apparatus for dehydration |
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|---|---|---|---|---|
| JPH01189358A (en) * | 1988-01-25 | 1989-07-28 | Pennwalt Corp | Sludge dehydration method and apparatus using decanter type centrifugal separator |
| JPH02160063A (en) * | 1988-12-08 | 1990-06-20 | Pennwalt Corp | Method and apparatus for dehydration |
Cited By (23)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR19990083738A (en) * | 1999-07-10 | 1999-12-06 | 박재덕 | Horizontal series-type double acceleration centrifugal |
| JP2007152406A (en) * | 2005-12-06 | 2007-06-21 | Kobelco Eco-Solutions Co Ltd | Screw press |
| JP2008290142A (en) * | 2007-05-28 | 2008-12-04 | Kobelco Eco-Solutions Co Ltd | Screw press |
| US20110105292A1 (en) * | 2008-06-06 | 2011-05-05 | M-I L.L.C. | Dual feed centrifuge |
| WO2009149373A3 (en) * | 2008-06-06 | 2010-03-11 | M-I L.L.C. | Dual feed centrifuge |
| US8961381B2 (en) | 2008-06-06 | 2015-02-24 | M-I L.L.C. | Dual feed centrifuge |
| EA017792B1 (en) * | 2008-06-06 | 2013-03-29 | Эм-Ай Эл. Эл. Си. | Dual feed centrifuge |
| CN102186595A (en) * | 2008-06-06 | 2011-09-14 | M-I有限公司 | Dual feed centrifuge |
| WO2010134309A1 (en) * | 2009-05-18 | 2010-11-25 | 株式会社西原環境テクノロジー | Centrifugal separation device |
| JP2010264417A (en) * | 2009-05-18 | 2010-11-25 | Nishihara Environment Technology Inc | Centrifugal separation apparatus |
| WO2010134310A1 (en) * | 2009-05-18 | 2010-11-25 | 株式会社西原環境テクノロジー | Centrifugal separation device |
| CN102448896A (en) * | 2009-05-18 | 2012-05-09 | 株式会社西原环境 | Centrifugal separation device |
| CN102482130A (en) * | 2009-05-18 | 2012-05-30 | 株式会社西原环境 | Centrifugal separation device |
| JP2010264419A (en) * | 2009-05-18 | 2010-11-25 | Nishihara Environment Technology Inc | Centrifugal separation apparatus |
| JP2012011300A (en) * | 2010-06-30 | 2012-01-19 | Nishihara Environment Co Ltd | Centrifugal separation apparatus and sludge treatment method |
| JP2012115814A (en) * | 2010-12-03 | 2012-06-21 | Tomoe Engineering Co Ltd | Centrifugal separator and sludge dehydration method |
| JP2013000662A (en) * | 2011-06-16 | 2013-01-07 | Tsukishima Kikai Co Ltd | Centrifugal separator |
| JP2013158747A (en) * | 2012-02-08 | 2013-08-19 | Nishihara Environment Co Ltd | Sludge dehydration system |
| JP2014200717A (en) * | 2013-04-02 | 2014-10-27 | 株式会社西原環境 | Solid-liquid separation apparatus and solid-liquid separation method |
| JP2013188751A (en) * | 2013-07-01 | 2013-09-26 | Nishihara Environment Co Ltd | Centrifugal separating device |
| JP2015033695A (en) * | 2014-10-17 | 2015-02-19 | 月島機械株式会社 | Centrifugal separator |
| JP2019118853A (en) * | 2017-12-28 | 2019-07-22 | 水ｉｎｇ株式会社 | Method for dewatering organic sludge, treatment apparatus used for dewatering organic sludge, and organic coagulant |
| JP2019081174A (en) * | 2019-02-15 | 2019-05-30 | 月島機械株式会社 | Treatment apparatus and process for organic waste |
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