JP2018164885A

JP2018164885A - Rotary pressurizing dehydrator

Info

Publication number: JP2018164885A
Application number: JP2017063301A
Authority: JP
Inventors: 平松　達生; Tatsuo Hiramatsu; 達生平松; 嘉高武市; Yoshitaka TAKEICHI; 尚幸高田; Naoyuki Takada
Original assignee: Tomoe Engineering Co Ltd
Current assignee: Tomoe Engineering Co Ltd
Priority date: 2017-03-28
Filing date: 2017-03-28
Publication date: 2018-10-25
Anticipated expiration: 2037-03-28
Also published as: JP6383039B1

Abstract

PROBLEM TO BE SOLVED: To provide a rotary pressurizing dehydrator capable of further efficiently dehydrating an object as compared with a conventional rotary pressurizing dehydrator to obtain a dehydrated cake of lower moisture content.SOLUTION: A rotary pressurizing dehydrator 1 is configurated by arranging a metallic electrode 10, at an intermediate position in the width direction of a filter chamber 9, so as to project toward an inner spacer 3 from the inner peripheral face of an outer spacer 4 to keep the electrode 10 electrically connected to the anode of a power source device, and a screen 6 electrically connected to the cathode of the power source device, by using the electrode 10 as the anode, and the screen 6 as the cathode to impress direct current voltage to be able to perform electric osmosis dehydration, and by arranging flocculant supply means (flocculant passage 14, nozzle 15) at the rear stage of the filter chamber 9 to be able to supply an inorganic flocculant into the filter chamber 9 at a suitable timing.SELECTED DRAWING: Figure 1

Description

本発明は、回転軸周りに形成された環状（Ｃ字状）の濾室内を進行させるに従って、処理対象物に次第に圧力を加えて脱水処理を行う回転加圧脱水機に関し、特に、濾室内において濃縮された処理対象物に対し、無機凝集剤を適切なタイミングで添加することにより、処理対象物をより一層効率的に脱水することができる回転加圧脱水機に関する。 The present invention relates to a rotary pressure dehydrator that performs a dehydration process by gradually applying pressure to an object to be processed as it advances through an annular (C-shaped) filter chamber formed around a rotation axis. The present invention relates to a rotary pressure dehydrator capable of more efficiently dehydrating a processing object by adding an inorganic flocculant to the concentrated processing object at an appropriate timing.

回転加圧脱水機（ロータリープレスフィルタ）は、特開２００１−１１３１０９号公報に示されているように、回転軸周りに形成された環状の濾室内に液状の処理対象物（処理原液）を導入し、二枚の円盤状の金属製スクリーンを回転させることによって処理対象物を前方へ進行させ、次第に圧力を加えて脱水処理を行う装置であり、汚泥の脱水等に広く用いられている。 As shown in Japanese Patent Application Laid-Open No. 2001-113109, a rotary pressure dehydrator (rotary press filter) introduces a liquid processing object (processing stock solution) into an annular filter chamber formed around a rotating shaft. In addition, it is a device that advances a processing object forward by rotating two disk-shaped metal screens and gradually applies pressure to perform a dehydration process, and is widely used for sludge dehydration and the like.

回転加圧脱水機に関しては、より効率的に処理対象物を脱水できるよう、様々な提案がされており、例えば、特開２０１７−０２３９４４号公報には、電気浸透の原理を利用した脱水を行うことが可能なように構成した回転加圧脱水機が開示されている。 Various proposals have been made regarding a rotary pressure dehydrator so that a processing object can be dehydrated more efficiently. For example, JP-A-2017-023944 performs dehydration using the principle of electroosmosis. There is disclosed a rotary pressure dehydrator configured to be capable of this.

特開２００１−１１３１０９号公報JP 2001-113109 A 特開２０１７−０２３９４４号公報JP 2017-023944 A ＷＯ２００５／１０５２６３Ａ１WO2005 / 105263A1

回転加圧脱水機は、上述したように汚泥の脱水等に広く用いられているところ、回転加圧脱水機を用いて脱水処理された汚泥（汚泥ケーキ）は、その後、焼却処理された後、埋立処分、或いは、資源化されて再利用されることになるが、回転加圧脱水機において、より一層効率的に汚泥を脱水し、より含水率の低い汚泥ケーキを得ることができれば、その後の焼却処理において必要となるエネルギーを大幅に節減できる可能性があり、ＣＯ２排出量の削減にも寄与することになる。 As described above, the rotary pressure dehydrator is widely used for sludge dehydration, etc., and after the sludge (sludge cake) dehydrated using the rotary pressure dehydrator is incinerated, Although it will be landfilled or reused after being recycled, if the sludge can be dehydrated more efficiently in a rotary pressure dehydrator and a sludge cake with a lower moisture content can be obtained, There is a possibility that the energy required in the incineration process can be greatly reduced, which contributes to the reduction of CO2 emissions.

本発明は、このような事情に基づいてなされたものであり、従来の回転加圧脱水機と比較して、より一層効率的に対象物を脱水することができ、より低含水率の脱水ケーキを得ることができる回転加圧脱水機を提供することを目的とする。 The present invention has been made based on such circumstances, and can dehydrate an object even more efficiently than a conventional rotary pressure dehydrator, and a dehydrated cake with a lower moisture content. An object of the present invention is to provide a rotary pressure dehydrator capable of obtaining the above.

本発明に係る回転加圧脱水機は、回転軸、インナースペーサ、アウタースペーサ、ディフレクタ、及び、前記インナースペーサの両側面にそれぞれ固定された二枚の金属製のスクリーンを有し、原液供給口から、前記インナースペーサ及び前記ディフレクタと前記アウタースペーサとの間に形成される環状の濾室内へ導入した処理対象物を、前記二枚のスクリーンを回転させることによって前方へ進行させ、次第に圧力を加えて濾過圧縮するように構成された回転加圧脱水機において、前記濾室の幅方向の中間位置において、前記アウタースペーサの内周面から前記インナースペーサに向かって突出するように、又は、前記ディフレクタの下面から前記アウタースペーサに向かって突出するように、金属製の電極部が配置され、前記電極部が電源装置の陽極に電気的に接続されるとともに、前記スクリーンが前記電源装置の陰極に電気的に接続され、前記電極部を陽極、スクリーンを陰極として直流電圧を印加することにより、電気浸透脱水を行うことができるように構成され、濾室の後段部に凝集剤供給手段が配置され、濾室内へ凝集剤を供給できるように構成されていることを特徴としている。 The rotary pressure dehydrator according to the present invention has a rotating shaft, an inner spacer, an outer spacer, a deflector, and two metal screens fixed to both side surfaces of the inner spacer, respectively. The processing object introduced into the annular filter chamber formed between the inner spacer and the deflector and the outer spacer is moved forward by rotating the two screens, and gradually pressure is applied. In the rotary pressurization dehydrator configured to perform filtration and compression, at an intermediate position in the width direction of the filtration chamber, the outer circumferential surface of the outer spacer protrudes toward the inner spacer, or the deflector A metal electrode portion is disposed so as to protrude from the lower surface toward the outer spacer, and the electrode portion is The screen is electrically connected to the anode of the power supply device, and the screen is electrically connected to the anode of the power source device, and the electrode portion is used as an anode and the screen is used as the cathode to apply a DC voltage to perform electroosmotic dehydration. The flocculant supply means is arranged at the rear stage of the filter chamber, and the flocculant can be supplied into the filter chamber.

尚、この回転加圧脱水機が、ケーキ出口付近においてバーチカルリストリクタを有するタイプのものである場合には、電極部を、バーチカルリストリクタの上面からディフレクタ又はインナースペーサに向かって突出するように配置することができる。 When this rotary pressure dehydrator is of a type having a vertical restrictor near the cake outlet, the electrode portion is arranged so as to protrude from the upper surface of the vertical restrictor toward the deflector or the inner spacer. can do.

また、濾室内における電極部よりも上流側の位置に、アウタースペーサの内周面からインナースペーサに向かって突出するように、突起を配置することもできる。 In addition, a protrusion can be arranged so as to protrude from the inner peripheral surface of the outer spacer toward the inner spacer at a position upstream of the electrode portion in the filter chamber.

また、凝集剤供給手段は、アウタースペーサの内側に形成された凝集剤流路と、アウタースペーサの内周面に配置され、濾室内空間に向かって凝集剤を放出するノズルとによって構成することができるほか、電極部（又は突起）の内側に形成された凝集剤流路と、電極部（又は突起）の上流側の位置において、処理対象物の進行方向と反対の方向へ凝集剤を放出できる向きで配置されたノズル、或いは、電極部（又は突起）の下流側の位置において、処理対象物の進行方向と同じ方向へ凝集剤を放出できる向きで配置されたノズルとによって構成することもできる。 Further, the flocculant supply means may be constituted by a flocculant flow path formed inside the outer spacer, and a nozzle that is disposed on the inner peripheral surface of the outer spacer and discharges the flocculant toward the filter chamber space. In addition, the flocculant can be released in the direction opposite to the direction of travel of the object to be processed at the position on the upstream side of the flocculant channel formed inside the electrode portion (or protrusion) and the electrode portion (or protrusion). It can also be constituted by a nozzle arranged in a direction, or a nozzle arranged in a direction that can release the flocculant in the same direction as the traveling direction of the processing object at a position downstream of the electrode part (or projection). .

尚、この回転加圧脱水機を用いて処理対象物を脱水する場合、回転加圧脱水機への導入前に、処理対象物に無機凝集剤を添加し、次いで高分子凝集剤を添加し、混合、撹拌してフロックを形成し、フロックが形成された処理対象物を回転加圧脱水機に導入し、濾室の後段部に配置されている凝集剤供給手段により、濾室内へ無機凝集剤を供給して脱水を行う方法もある。 In addition, when dehydrating a processing object using this rotary pressure dehydrator, before introduction into the rotary pressure dehydrator, an inorganic flocculant is added to the processing object, and then a polymer flocculant is added, A floc is formed by mixing and stirring, the processing object on which the floc is formed is introduced into a rotary pressurization dehydrator, and an inorganic flocculant is introduced into the filter chamber by the flocculant supply means arranged at the rear stage of the filter chamber. There is also a method of supplying water to perform dehydration.

本発明に係る回転加圧脱水機は、電気浸透脱水を行うことができるように構成されるとともに、濾室の後段部を進行中の処理対象物（ある程度脱水が進行して濃縮された処理対象物）に対して無機凝集剤を添加できるように構成されているため、電気浸透による脱水が行われる際に、処理対象物のフロックに内包されている水分を遊離させることができ、処理対象物中の遊離水の量を増加させることができ、その結果、単に電気浸透を行う場合と比べ、より一層効率的な脱水が可能となり、より含水率が低い脱水ケーキを得ることができる。従って、この脱水機を汚泥の脱水に用いた場合、その後の処理（脱水汚泥の焼却処理）において必要となるエネルギーを大幅に節減できるほか、ＣＯ２排出量の削減にも寄与する。 The rotary pressure dehydrator according to the present invention is configured so as to be able to perform electroosmotic dehydration, and a processing object in progress in the latter part of the filter chamber (a processing object concentrated to some extent by dehydration). Since the inorganic flocculant can be added to the product), the water contained in the floc of the processing object can be released when dehydration by electroosmosis is performed, and the processing object It is possible to increase the amount of free water therein, and as a result, it is possible to perform more efficient dehydration and to obtain a dehydrated cake having a lower water content than when simply performing electroosmosis. Therefore, when this dehydrator is used for dewatering sludge, energy required for the subsequent treatment (incineration treatment of dewatered sludge) can be greatly reduced, and it contributes to the reduction of CO2 emissions.

尚、この回転加圧脱水機を、電極部及びスクリーンへの通電を行わずに（即ち、電気浸透を行わずに）、電極部を突起として使用した場合でも、凝集剤供給手段によって濾室内の処理対象物に無機凝集剤を適切なタイミングで供給することにより、従来の回転加圧脱水機と比較して、より一層効率よく対象物の脱水を行うことができ、より低い含水率の脱水ケーキを得ることができる。 Even when this rotary pressurization dehydrator is used as a projection without energizing the electrode part and the screen (that is, without electroosmosis), the flocculant supplying means is used for the inside of the filter chamber. By supplying the inorganic flocculant to the treatment object at an appropriate timing, the object can be dehydrated more efficiently than a conventional rotary pressure dehydrator, and a dehydrated cake with a lower water content Can be obtained.

図１は、本発明に係る回転加圧脱水機（第一実施形態）の内部構造を示す図である。FIG. 1 is a diagram showing the internal structure of a rotary pressurizing dehydrator (first embodiment) according to the present invention. 図２は、図１に示すＸ−Ｘ線による回転加圧脱水機１の断面図である。FIG. 2 is a cross-sectional view of the rotary pressure dehydrator 1 along the line XX shown in FIG. 図３は、本発明に係る回転加圧脱水機の他の構成例（第二実施形態）の内部構造を示す図である。FIG. 3 is a diagram showing an internal structure of another configuration example (second embodiment) of the rotary pressurizing dehydrator according to the present invention. 図４は、図３に示す電極部１０の斜視図である。4 is a perspective view of the electrode unit 10 shown in FIG. 図５は、本発明に係る回転加圧脱水機の他の構成例（第三実施形態）の内部構造を示す図である。FIG. 5 is a diagram showing an internal structure of another configuration example (third embodiment) of the rotary pressurizing dehydrator according to the present invention.

以下、本発明「回転加圧脱水機」の実施形態について説明する。図１は、本発明の第一実施形態に係る回転加圧脱水機１の内部構造を示す図であり、図２は、図１に示すＸ−Ｘ線による回転加圧脱水機１の断面図である。これらの図に示すように、本実施形態の回転加圧脱水機１は、従来の回転加圧脱水機の基本的な構成要素を具備しており、基本的な動作態様は、従来の回転加圧脱水機と共通している。 Hereinafter, embodiments of the “rotary pressure dehydrator” of the present invention will be described. FIG. 1 is a diagram showing an internal structure of a rotary pressure dehydrator 1 according to the first embodiment of the present invention, and FIG. 2 is a cross-sectional view of the rotary pressure dehydrator 1 taken along line XX shown in FIG. It is. As shown in these drawings, the rotary pressure dehydrator 1 of this embodiment includes the basic components of a conventional rotary pressure dehydrator. Common with pressure dehydrator.

具体的には、回転軸２、インナースペーサ３、アウタースペーサ４、ディフレクタ５、二枚の金属製のスクリーン６、及び、図示しないケーシング、駆動モータ等によって構成されており、原液供給口７から環状（Ｃ字状）の濾室９（インナースペーサ３及びディフレクタ５と、アウタースペーサ４との間に形成されている、断面が矩形状のスペースであって、原液供給口７からケーキ出口８に至るまでのスペース）内へ処理対象物（処理原液）を導入し、回転軸２、インナースペーサ３（回転軸２周りに固定されている）、及び、スクリーン６（インナースペーサ３の両側面にそれぞれ固定されている）を回転させることによって処理対象物を前方へ進行させ、次第に圧力を加えて濾過圧縮し、ケーキ出口８から脱水ケーキを排出することができる。 Specifically, the rotary shaft 2, the inner spacer 3, the outer spacer 4, the deflector 5, the two metal screens 6, the casing (not shown), the drive motor, and the like are configured from the stock solution supply port 7 in an annular shape. A (C-shaped) filter chamber 9 (a space formed between the inner spacer 3 and the deflector 5 and the outer spacer 4 and having a rectangular cross section, from the stock solution supply port 7 to the cake outlet 8. The object to be treated (treatment stock solution) is introduced into the space), and the rotary shaft 2, the inner spacer 3 (fixed around the rotary shaft 2), and the screen 6 (fixed on both side surfaces of the inner spacer 3). The object to be processed is moved forward by rotating the filter, the pressure is gradually applied, the filter is compressed, and the dehydrated cake is discharged from the cake outlet 8. It can be.

尚、本実施形態の回転加圧脱水機１は、ケーキ出口８においてバーチカルリストリクタ１２（背圧装置）が配置されており、先端側が上下方向に揺動して排出直前の脱水ケーキを圧縮できるように構成されている。 In the rotary pressure dehydrator 1 of this embodiment, a vertical restrictor 12 (back pressure device) is disposed at the cake outlet 8, and the tip side swings up and down to compress the dehydrated cake immediately before discharge. It is configured as follows.

また、本実施形態の回転加圧脱水機１は、電気浸透による脱水作用によって対象物をより効率的に脱水できるようになっている。具体的には、濾室９の後段部（濾室９の中間位置よりもケーキ出口８側）において、濾室９の幅方向の中間位置（両側の各スクリーン６との間にそれぞれ間隔を置いた位置）に、複数の金属製の電極部１０が、処理対象物の進行方向に直列するように配置されており、これらの電極部１０を陽極、スクリーン６を陰極として直流電圧を印加できるように構成されており、濾室９内において電気浸透現象を発現させ、より効率的に脱水を行うことができる。 Moreover, the rotary pressure dehydrator 1 of the present embodiment can dehydrate an object more efficiently by a dehydrating action by electroosmosis. Specifically, at the rear stage of the filter chamber 9 (the cake outlet 8 side of the intermediate position of the filter chamber 9), an intermediate position in the width direction of the filter chamber 9 (with a gap between each screen 6 on both sides). A plurality of metal electrode portions 10 are arranged in series in the traveling direction of the object to be processed, so that a DC voltage can be applied using these electrode portions 10 as an anode and the screen 6 as a cathode. The electroosmosis phenomenon is expressed in the filter chamber 9, and dehydration can be performed more efficiently.

そして、本実施形態の回転加圧脱水機１における特徴的な事項は、濾室９の後段部（濾室９の中間位置よりもケーキ出口８側）に凝集剤供給手段（凝集剤流路１４、ノズル１５）が配置され、濾室９内に凝集剤を供給できるように構成されている点である。具体的には、この回転加圧脱水機１のアウタースペーサ４には、図１に示すように、外周側から内周側まで貫通する凝集剤流路１４が形成されており、図示しないポンプ等によって機外からこの凝集剤流路１４へ凝集剤をフィードすると、その先端のノズル１５（アウタースペーサ４の内周面に配置されている）から凝集剤が放出され、濾室９内へ供給できるようになっている。 And the characteristic matter in the rotary pressurization dehydrator 1 of the present embodiment is that the flocculant supply means (flocculating agent flow path 14) is provided at the rear stage of the filter chamber 9 (the cake outlet 8 side from the intermediate position of the filter chamber 9). , The nozzle 15) is disposed, and the flocculant can be supplied into the filter chamber 9. Specifically, as shown in FIG. 1, the outer spacer 4 of the rotary pressure dehydrator 1 is formed with a flocculant flow path 14 penetrating from the outer peripheral side to the inner peripheral side, and a pump or the like (not shown) When the flocculant is fed to the flocculant flow path 14 from outside the apparatus, the flocculant is discharged from the nozzle 15 (disposed on the inner peripheral surface of the outer spacer 4) at the tip thereof and can be supplied into the filter chamber 9. It is like that.

ここで、本実施形態の回転加圧脱水機１の作用（汚泥を処理対象物として脱水する場合の例）について簡単に説明する。汚泥を脱水する場合、通常、回転加圧脱水機１内への導入前に、凝集剤の添加による汚泥の調質が行われている。具体的には、図示しないフロキュレータ等において汚泥に対し凝集剤が添加され、混合、撹拌される。 Here, the effect | action (example in the case of spin-dry | dehydrating sludge as a process target object) of the rotary pressurization dehydrator 1 of this embodiment is demonstrated easily. When dewatering sludge, the sludge is usually tempered by adding a flocculant before introduction into the rotary pressure dehydrator 1. Specifically, a flocculant is added to sludge in a flocculator (not shown), and mixed and stirred.

汚泥に対して添加される凝集剤としては、高分子凝集剤や無機凝集剤（ポリ硫酸鉄、ＰＡＣ等）がある。高分子凝集剤を添加した場合、荷電中和と架橋によって汚泥粒子をフロック化して「凝集汚泥」とすることができ、固液分離性を向上させることができる。 Examples of the flocculant added to the sludge include a polymer flocculant and an inorganic flocculant (polyiron sulfate, PAC, etc.). When a polymer flocculant is added, sludge particles can be flocked by charge neutralization and crosslinking to form “aggregated sludge”, and solid-liquid separation can be improved.

凝集汚泥を回転加圧脱水機１の濾室９内へ導入すると、上述の通り、回転軸２、インナースペーサ３、及び、スクリーン６の回転によって汚泥が濾室９内を前方へ送られていき、その過程で脱水が進行し、汚泥の含水率が次第に低下していくことになる。汚泥が濾室９の前段部を通過し終えた頃には、ある程度脱水が進み、含水率が低下した状態（固形分濃度が上昇した状態）となっている（濃縮汚泥）。 When the coagulated sludge is introduced into the filter chamber 9 of the rotary pressure dehydrator 1, as described above, the sludge is sent forward through the filter chamber 9 by the rotation of the rotary shaft 2, the inner spacer 3, and the screen 6. In the process, dehydration proceeds and the moisture content of the sludge gradually decreases. When the sludge has passed through the front part of the filter chamber 9, dehydration proceeds to some extent, and the moisture content is reduced (solid content concentration is increased) (concentrated sludge).

そして、濾室９の後段部には電極部１０が配置されており、図示しない電源装置から直流電圧を印加すると、電極部１０を陽極として、また、スクリーン６を陰極として、濾室９内（電極部１０とスクリーン６の間の領域）において電気浸透現象が発現し、濃縮汚泥中の水分が、陰極であるスクリーン６に向かって移動し、濾室９内の圧力により、水分がスクリーン６の目を抜けて濾室９の外側へ排出される。また、電気浸透により、スクリーン６近傍の固形分には、スクリーン６に対する反発力が作用することになり、スクリーン６の目詰まりが抑制され、より効率的に脱水を行うことができる。 An electrode unit 10 is arranged at the rear stage of the filter chamber 9. When a DC voltage is applied from a power supply device (not shown), the electrode unit 10 serves as an anode and the screen 6 serves as a cathode. In the region between the electrode unit 10 and the screen 6), an electroosmosis phenomenon occurs, and the moisture in the concentrated sludge moves toward the screen 6, which is a cathode. It passes through the eyes and is discharged to the outside of the filter chamber 9. In addition, due to electroosmosis, a repulsive force against the screen 6 acts on the solid content in the vicinity of the screen 6, clogging of the screen 6 is suppressed, and dewatering can be performed more efficiently.

更に、本実施形態の回転加圧脱水機１においては、上述の通り、電極部１０が配置されている濾室９の後段部において、アウタースペーサ４内に凝集剤流路１４が形成されており、その先端のノズル１５から濾室９内へ無機凝集剤を供給した場合、次のような作用が生じることになる。 Furthermore, in the rotary pressure dehydrator 1 of the present embodiment, as described above, the flocculant channel 14 is formed in the outer spacer 4 in the rear stage portion of the filter chamber 9 in which the electrode portion 10 is disposed. When the inorganic flocculant is supplied into the filter chamber 9 from the nozzle 15 at the tip, the following action occurs.

ポリ硫酸鉄等の無機凝集剤を、凝集汚泥（高分子凝集剤の添加によって汚泥粒子がフロック化した汚泥）に添加すると、フロックに内包されている水分を外側へ滲み出させて遊離させる作用が得られる。このような作用を奏する無機凝集剤を、電気浸透の対象となる凝集汚泥（即ち、濾室９の後段部を進行中の濃縮汚泥）に添加すると、電気浸透による脱水をより一層効率的に実行することができる。 Addition of inorganic flocculants such as polysulfate to flocculent sludge (sludge in which sludge particles are flocked by addition of polymer flocculant) causes the water contained in the floc to exude to the outside and release it. can get. When an inorganic flocculant having such an action is added to the coagulated sludge that is the target of electroosmosis (that is, the concentrated sludge in progress at the rear stage of the filter chamber 9), dehydration by electroosmosis is performed more efficiently. can do.

この点についてより詳細に説明すると、濾室９の後段部を進行中の濃縮汚泥に対して電気浸透を行った場合、上述の通り、濃縮汚泥中の水分をスクリーン６に向かって移動させることができ、効率の良い脱水が可能となるが、電気浸透によって移動させることができるのは、基本的には、その時点で濃縮汚泥中において既に遊離している水分（遊離水）だけであって、フロックに内包されている水分については、電気浸透によって移動させることは難しい。 If this point is demonstrated in detail, when electroosmosis is performed with respect to the ongoing sludge in the back | latter stage part of the filter chamber 9, as above-mentioned, the water | moisture content in a concentrated sludge can be moved toward the screen 6. Can be efficiently dehydrated, but the only thing that can be moved by electroosmosis is water that has already been released in the concentrated sludge (free water) at that time, The moisture contained in the flock is difficult to move by electroosmosis.

本実施形態の回転加圧脱水機１では、濾室９の後段部において電気浸透が行われる濃縮汚泥に対して無機凝集剤を添加できるように構成されているため、フロックに内包されている水分を滲み出させ、新たに遊離させることができる。つまり、無機凝集剤を適切なタイミングで添加することにより、濃縮汚泥中の遊離水の量を増加させることができ、その結果、単に電気浸透を行う場合と比べ、より一層効率的な脱水が可能となり、より含水率が低い脱水ケーキを得ることができる。 In the rotary pressure dehydrator 1 of the present embodiment, since the inorganic flocculant can be added to the concentrated sludge in which electroosmosis is performed in the rear stage of the filter chamber 9, the moisture contained in the floc Can be exuded and newly released. In other words, the amount of free water in the concentrated sludge can be increased by adding the inorganic flocculant at an appropriate timing, and as a result, more efficient dehydration is possible compared to the case of simply performing electroosmosis. Thus, a dehydrated cake having a lower moisture content can be obtained.

図３は、本発明の第二実施形態に係る回転加圧脱水機１の内部構造を示す図である。図３の回転加圧脱水機１は、濾室９の後段部に電極部１０が配置され、電気浸透によって対象物を脱水できる点、及び、濾室９の後段部において凝集剤を供給できるように構成されている点で、図１に示す回転加圧脱水機１（第一実施形態）と共通しているが、凝集剤流路１４が電極部１０の内側に形成されるとともに、ノズル１５が、電極部１０の上流側（進行する汚泥と対向する側）の位置において、汚泥の進行方向と反対の方向へ凝集剤を放出できる向きで配置されている点で異なっている。 FIG. 3 is a diagram showing an internal structure of the rotary pressurization dehydrator 1 according to the second embodiment of the present invention. The rotary pressure dehydrator 1 of FIG. 3 is provided with an electrode unit 10 at the rear stage of the filter chamber 9 so that the object can be dehydrated by electroosmosis, and the coagulant can be supplied at the rear stage of the filter chamber 9. 1 is common to the rotary pressurization dehydrator 1 (first embodiment) shown in FIG. 1, but the flocculant channel 14 is formed inside the electrode portion 10 and the nozzle 15 However, it is different in that the flocculant can be discharged in a direction opposite to the traveling direction of the sludge at a position on the upstream side of the electrode portion 10 (side facing the traveling sludge).

図１に示したように、ノズル１５をアウタースペーサ４の内周面において開口させた場合、濾室９内空間のうちノズル１５が配置されているゾーン（汚泥の進行方向と直交する断面の領域）の全体にわたって凝集剤を分散させること（例えば、インナースペーサ３の近傍を通過中の汚泥に凝集剤を接触させること）は困難であるが、電極部１０は、濾室９内を半径方向へ横断するように配置されているため、図３に示すように、一つの電極部１０において複数のノズル１５を、濾室９の半径方向に沿って多段的に配置することにより、また、汚泥の進行方向と反対方向へ凝集剤を放出することによって、より広範囲にわたって凝集剤を分散させることができ、その結果、フロック内の水分をより効果的に遊離させることができる。 As shown in FIG. 1, when the nozzle 15 is opened on the inner peripheral surface of the outer spacer 4, the zone in which the nozzle 15 is disposed in the inner space of the filter chamber 9 (the cross-sectional area orthogonal to the sludge traveling direction). ) (For example, bringing the flocculant into contact with the sludge passing through the vicinity of the inner spacer 3) is difficult, but the electrode portion 10 is formed in the filter chamber 9 in the radial direction. Since the plurality of nozzles 15 are arranged in a plurality of stages along the radial direction of the filter chamber 9 as shown in FIG. By releasing the flocculant in the direction opposite to the traveling direction, the flocculant can be dispersed over a wider range, and as a result, moisture in the floc can be released more effectively.

尚、図３の例では、ノズル１５は、各電極部１０の上流側の位置にのみ配置されているが、上端部（インナースペーサ３と対向する部位）や、下流側の位置、或いは、側面にも、併せて配置することができる。また、凝集剤を放出する向きについても、任意に設定することができる。 In the example of FIG. 3, the nozzle 15 is disposed only at the upstream position of each electrode portion 10, but the upper end (the portion facing the inner spacer 3), the downstream position, or the side surface In addition, they can be arranged together. Also, the direction of releasing the flocculant can be arbitrarily set.

図５は、本発明の第三実施形態に係る回転加圧脱水機１の内部構造を示す図である。図３の回転加圧脱水機１は、濾室９の後段部に三つの電極部１０が配置されているが、図５の回転加圧脱水機１においては、濾室９の後段部に、二つの電極部１０と、一つのステンレス製の突起１６が配置されている。この突起１６は、図示されているように、二つの電極部１０よりも上流側（原液供給口７側）に配置されており、また、電気浸透のための電源装置には接続されておらず、濾室９の容量（濾室断面積）を減少させて、その周囲を通過する汚泥を圧縮する機能を有している。 FIG. 5 is a diagram showing the internal structure of the rotary pressurization dehydrator 1 according to the third embodiment of the present invention. In the rotary pressure dehydrator 1 of FIG. 3, three electrode portions 10 are arranged at the rear stage portion of the filter chamber 9, but in the rotary pressure dehydrator 1 of FIG. 5, Two electrode portions 10 and one stainless steel protrusion 16 are arranged. As shown in the figure, the protrusion 16 is disposed on the upstream side (the stock solution supply port 7 side) of the two electrode portions 10 and is not connected to a power supply device for electroosmosis. The filter chamber 9 has a function of reducing the capacity of the filter chamber 9 (cross-sectional area of the filter chamber) and compressing sludge passing therearound.

この突起１６の内側には、凝集剤流路１４が形成されるとともに、ノズル１５が、突起１６の下流側（進行する汚泥から見て裏側）の位置において、汚泥の進行方向と同じ方向へ凝集剤を放出できる向きで配置されている。この場合も、凝集剤を好適に分散させることができ、フロック内の水分を効果的に遊離させることができる。 A flocculant flow path 14 is formed inside the protrusion 16, and the nozzle 15 aggregates in the same direction as the direction of the sludge at the position downstream of the protrusion 16 (the back side when viewed from the proceeding sludge). It is arranged so that the agent can be released. Also in this case, the flocculant can be suitably dispersed, and moisture in the floc can be effectively released.

ところで、図１又は図３に示す回転加圧脱水機１を用いて汚泥等の脱水を行う場合において、濾室９の後段部に供給する無機凝集剤の量が多過ぎると、凝集汚泥（回転加圧脱水機１への導入前に、フロキュレータ等において高分子凝集剤が添加されることによって汚泥粒子がフロック化した汚泥）の「再破砕」が進み、目抜けによってＳＳ回収率が低下してしまうという問題がある。 By the way, when dewatering sludge etc. using the rotary pressurization dehydrator 1 shown in FIG. 1 or FIG. 3, if there is too much quantity of the inorganic flocculant supplied to the back | latter stage part of the filter chamber 9, flocculated sludge (rotation) Before the introduction into the pressure dehydrator 1, the “flocculation” of the sludge in which the sludge particles are flocked by the addition of the polymer flocculant in the flocculator or the like proceeds, and the SS recovery rate decreases due to the omission. There is a problem that it ends up.

そこで、この回転加圧脱水機１を運転する際には、導入前の汚泥に対し、まず無機凝集剤を添加し、次いで高分子凝集剤を添加し、フロキュレータにおいて混合、撹拌してフロックを形成し、この凝集汚泥を回転加圧脱水機１に導入し、濾室９の後段部において無機凝集剤を供給して、脱水を行うことが好適である。このように、無機凝集剤を濾室９の後段部においてのみ添加するのではなく、高分子凝集剤を添加する前にも無機凝集剤を添加すること（前添加）により、導入前の汚泥の調質の際に、より効率的に凝集（フロック化）を進行させることができ、その結果、ＳＳ回収率を低下させることなく、脱水性を向上させることができる。 Therefore, when the rotary pressure dehydrator 1 is operated, the inorganic flocculant is first added to the sludge before introduction, then the polymer flocculant is added, and the floc is mixed and stirred in the flocculator. It is preferable to form the coagulated sludge into the rotary pressure dehydrator 1 and supply an inorganic coagulant at the rear stage of the filter chamber 9 to perform dehydration. In this way, the inorganic flocculant is not added only at the rear stage of the filter chamber 9, but by adding the inorganic flocculant before the addition of the polymer flocculant (pre-addition), the sludge before introduction is added. Aggregation (flocculation) can proceed more efficiently during tempering, and as a result, dewaterability can be improved without reducing the SS recovery rate.

ここで、図１に示す回転加圧脱水機１の脱水性能について行った試験の結果を実施例として説明する。まず、図１に示す回転加圧脱水機１の実験機（濾室直径：９００ｍｍ、濾室幅：５０ｍｍ）を用意し、特定の条件の汚泥（高分子凝集剤を予め１．０％の薬注率で添加した汚泥）を処理対象物として、次のような運転条件で、また、濾室９の後段部において電気浸透（７．２〜７．７ｋＷｈ／ｈ）を実行するとともに、ポリ硫酸鉄（無機凝集剤）の供給を行って脱水処理を実施し、排出された脱水ケーキの含水率等を計測した（本発明１、２）。
・回転数：３．０ｍｉｎ^−１
・入口圧力：１４〜１５ｋＰａ
・ろ過速度：１６５〜１６７ｋｇ−ＤＳ／ｍ^２・ｈ
・本体負荷荷重（ロードセル測定値）：４００〜８１０ｋｇ Here, the result of the test done about the dehydration performance of the rotary pressurization dehydrator 1 shown in FIG. 1 is demonstrated as an Example. First, an experimental machine (filter chamber diameter: 900 mm, filter chamber width: 50 mm) of the rotary pressure dehydrator 1 shown in FIG. 1 is prepared. Sludge added at a filling rate) is treated as an object to be treated under the following operating conditions, and electroosmosis (7.2 to 7.7 kWh / h) is performed at the rear stage of the filter chamber 9 and polysulfuric acid. Iron (inorganic flocculant) was supplied to perform dehydration treatment, and the moisture content and the like of the discharged dehydrated cake were measured (Inventions 1 and 2).
・ Rotation speed: 3.0min ^-1
・ Inlet pressure: 14-15kPa
Filtration rate: 165 to 167 kg-DS / m ² · h
-Body load (measured load cell): 400-810kg

また、図１に示す回転加圧脱水機１の実験機（濾室９の直径９００ｍｍ、幅５０ｍｍ）から電極部１０を取り外したものを用意し、本発明１、２と同一条件の汚泥を処理対象物として、上記運転条件で（ポリ硫酸鉄（無機凝集剤）の供給、及び、電気浸透は実行せずに）脱水処理を実行し、排出された脱水ケーキの含水率等を計測した（比較例１、２）。本発明１、２、及び、比較例１、２の測定結果を次表に示す。 Moreover, what removed the electrode part 10 from the experimental machine (diameter 900mm of the filter chamber 9 and width 50mm) of the rotary pressurization dehydrator 1 shown in FIG. 1 is prepared, and the sludge of the same conditions as this invention 1, 2 is processed. As an object, dehydration treatment was performed under the above operating conditions (without supplying polyiron sulfate (inorganic flocculant) and electroosmosis), and the moisture content of the discharged dehydrated cake was measured (comparison) Examples 1, 2). The measurement results of Inventions 1 and 2 and Comparative Examples 1 and 2 are shown in the following table.

表１に示す通り、本発明１、２の脱水機によって脱水処理を行った場合（濾室９の後段部へポリ硫酸鉄を供給しつつ電気浸透を実行した場合）、比較例１、２の脱水機によって脱水処理を行った場合（ポリ硫酸鉄の供給、及び、電気浸透を実行しなかった場合）と比較して、ケーキ含水率を４．２〜５．９％低下させることができる、ということが確認された。 As shown in Table 1, when dehydration was performed by the dehydrators of the present invention 1 and 2 (when electroosmosis was carried out while supplying polysulfate to the rear stage of the filter chamber 9), Comparative Examples 1 and 2 The moisture content of the cake can be reduced by 4.2 to 5.9% compared to the case where the dehydration process is performed by the dehydrator (when the supply of polysulfate and electroosmosis is not performed). That was confirmed.

尚、図１に示す回転加圧脱水機１において、電極部１０及びスクリーン６への通電を行わずに（電気浸透を実行せずに）、電極部１０を単に、濾室９の容量（濾室断面積）を減少させるための突起として使用するとともに、ノズル１５から濾室９内へポリ硫酸鉄等の無機凝集剤を供給して脱水を行った場合も、上記比較例１、２と比べて、ケーキ含水率を有効に低下させることができることが確認された。 In the rotary pressure dehydrator 1 shown in FIG. 1, the electrode unit 10 is simply connected to the capacity of the filter chamber 9 (filtered without conducting the electroosmosis) without energizing the electrode unit 10 and the screen 6. (Cross sectional area) is used as a protrusion for reducing the area, and also when an inorganic flocculant such as iron polysulfate is supplied from the nozzle 15 into the filter chamber 9 for dehydration, it is also compared with Comparative Examples 1 and 2 above. Thus, it was confirmed that the moisture content of the cake can be effectively reduced.

１：回転加圧脱水機、
２：回転軸、
３：インナースペーサ、
４：アウタースペーサ、
５：ディフレクタ、
６：スクリーン、
７：原液供給口、
８：ケーキ出口、
９：濾室、
１０：電極部、
１２：バーチカルリストリクタ、
１４：凝集剤流路、
１５：ノズル、
１６：突起 1: Rotary pressure dehydrator,
2: Rotating shaft,
3: Inner spacer,
4: Outer spacer,
5: Deflector,
6: Screen,
7: Stock solution supply port,
8: Cake exit,
9: Filter chamber
10: electrode part,
12: Vertical restrictor,
14: flocculant flow path,
15: Nozzle,
16: protrusion

本発明に係る回転加圧脱水機は、回転軸、インナースペーサ、アウタースペーサ、ディフレクタ、及び、前記インナースペーサの両側面にそれぞれ固定された二枚の金属製のスクリーンを有し、原液供給口から、前記インナースペーサ及び前記ディフレクタと前記アウタースペーサとの間に形成される環状の濾室内へ導入した処理対象物を、前記二枚のスクリーンを回転させることによって前方へ進行させ、次第に圧力を加えて濾過圧縮するように構成された回転加圧脱水機において、前記濾室の幅方向の中間位置において、前記アウタースペーサの内周面から前記インナースペーサに向かって突出するように、又は、前記ディフレクタの下面から前記アウタースペーサに向かって突出するように、金属製の電極部が配置され、前記電極部が電源装置の陽極に電気的に接続されるとともに、前記スクリーンが前記電源装置の陰極に電気的に接続され、前記電極部を陽極、スクリーンを陰極として直流電圧を印加することにより、電気浸透脱水を行うことができるように構成され、濾室の後段部に無機凝集剤供給手段が配置され、濾室内へ無機凝集剤を供給できるように構成されていることを特徴としている。 The rotary pressure dehydrator according to the present invention has a rotating shaft, an inner spacer, an outer spacer, a deflector, and two metal screens fixed to both side surfaces of the inner spacer, respectively. The processing object introduced into the annular filter chamber formed between the inner spacer and the deflector and the outer spacer is moved forward by rotating the two screens, and gradually pressure is applied. In the rotary pressurization dehydrator configured to perform filtration and compression, at an intermediate position in the width direction of the filtration chamber, the outer circumferential surface of the outer spacer protrudes toward the inner spacer, or the deflector A metal electrode portion is disposed so as to protrude from the lower surface toward the outer spacer, and the electrode portion is The screen is electrically connected to the anode of the power supply device, and the screen is electrically connected to the anode of the power source device, and the electrode portion is used as an anode and the screen is used as the cathode to apply a DC voltage to perform electroosmotic dehydration. it is configured so as to perform, inorganic coagulant supply means disposed downstream of the filter chamber, it is characterized in that it is configured to provide an inorganic coagulant into the filter chamber.

また、無機凝集剤供給手段は、アウタースペーサの内側に形成された凝集剤流路と、アウタースペーサの内周面に配置され、濾室内空間に向かって無機凝集剤を放出するノズルとによって構成することができるほか、電極部（又は突起）の内側に形成された凝集剤流路と、電極部（又は突起）の上流側の位置において、処理対象物の進行方向と反対の方向へ無機凝集剤を放出できる向きで配置されたノズル、或いは、電極部（又は突起）の下流側の位置において、処理対象物の進行方向と同じ方向へ無機凝集剤を放出できる向きで配置されたノズルとによって構成することもできる。 The inorganic flocculant supply means includes a flocculant channel formed inside the outer spacer, and a nozzle that is disposed on the inner peripheral surface of the outer spacer and discharges the inorganic flocculant toward the filter chamber space. In addition, the inorganic flocculant in the direction opposite to the traveling direction of the object to be treated at the flocculant channel formed inside the electrode part (or protrusion) and the upstream position of the electrode part (or protrusion). The nozzle is arranged in a direction that can release the liquid, or the nozzle that is arranged in a direction that can discharge the inorganic flocculant in the same direction as the processing object in the downstream position of the electrode part (or projection). You can also

Claims

A rotating shaft, an inner spacer, an outer spacer, a deflector, and two metal screens fixed to both side surfaces of the inner spacer, and the inner spacer, the deflector, and the outer spacer from the stock solution supply port The processing object introduced into the annular filter chamber formed between the two screens is advanced forward by rotating the two screens, and the pressure is gradually increased. In the dehydrator
At an intermediate position in the width direction of the filter chamber, a metal is used so as to protrude from the inner peripheral surface of the outer spacer toward the inner spacer, or from the lower surface of the deflector toward the outer spacer. Are arranged,
The electrode unit is electrically connected to the anode of the power supply device, the screen is electrically connected to the cathode of the power supply device, and the electrode unit is used as an anode and the screen is used as a cathode to apply a DC voltage, Configured to perform electroosmotic dehydration,
A rotary pressure dehydrator characterized in that a flocculant supply means is disposed at the rear stage of the filter chamber, and the flocculant can be supplied into the filter chamber.

A rotating shaft, an inner spacer, an outer spacer, a deflector, two metal screens fixed to both side surfaces of the inner spacer, and a vertical restrictor, and the inner spacer and the deflector from the stock solution supply port; The object to be treated introduced into the annular filter chamber formed between the outer spacer and the outer spacer is advanced forward by rotating the two screens, and is gradually compressed and filtered and compressed. In the rotary pressure dehydrator
At an intermediate position in the width direction of the filter chamber, a metal electrode portion is disposed so as to protrude from the upper surface of the vertical restrictor toward the deflector or the inner spacer,
The electrode unit is electrically connected to the anode of the power supply device, the screen is electrically connected to the cathode of the power supply device, and the electrode unit is used as an anode and the screen is used as a cathode to apply a DC voltage, Configured to perform electroosmotic dehydration,
A rotary pressure dehydrator characterized in that a flocculant supply means is disposed at the rear stage of the filter chamber, and the flocculant can be supplied into the filter chamber.

The protrusion is disposed at a position upstream of the electrode portion in the filter chamber so as to protrude from the inner peripheral surface of the outer spacer toward the inner spacer. Item 3. A rotary pressure dehydrator according to Item 2.

The flocculant supply means is constituted by a flocculant flow path formed inside the outer spacer, and a nozzle that is disposed on the inner peripheral surface of the outer spacer and discharges the flocculant toward the filter chamber space. The rotary pressure dehydrator according to any one of claims 1 to 3, which is characterized by the following.

The flocculant supply means is disposed in a direction capable of releasing the flocculant in a direction opposite to the traveling direction of the object to be treated at a position on the upstream side of the flocculant channel formed inside the electrode portion and the electrode portion. The nozzle and / or the nozzle disposed at a position downstream of the electrode portion in a direction capable of discharging the flocculant in the same direction as the traveling direction of the processing object. The rotary pressure dehydrator according to claim 1 or 2.

A flocculant supply means having a flocculant flow path formed inside the protrusion, and a nozzle arranged in a direction capable of releasing the flocculant in a direction opposite to the traveling direction of the object to be processed at a position upstream of the protrusion; And / or a nozzle disposed at a position downstream of the protrusion in a direction in which the flocculant can be discharged in the same direction as the traveling direction of the object to be processed. Rotating pressure dehydrator.

A rotating shaft, an inner spacer, an outer spacer, a deflector, and two metal screens fixed to both side surfaces of the inner spacer, and the inner spacer, the deflector, and the outer spacer from the stock solution supply port The processing object introduced into the annular filter chamber formed between the two screens is advanced forward by rotating the two screens, and the pressure is gradually increased. In the dehydrator
A protrusion is disposed at an intermediate position in the width direction of the filter chamber so as to protrude from the inner peripheral surface of the outer spacer toward the inner spacer or from the lower surface of the deflector toward the outer spacer. And
A rotary pressure dehydrator characterized in that a flocculant supply means is disposed at the rear stage of the filter chamber, and the flocculant can be supplied into the filter chamber.

A rotating shaft, an inner spacer, an outer spacer, a deflector, two metal screens fixed to both side surfaces of the inner spacer, and a vertical restrictor, and the inner spacer and the deflector from the stock solution supply port; The object to be treated introduced into the annular filter chamber formed between the outer spacer and the outer spacer is advanced forward by rotating the two screens, and is gradually compressed and filtered and compressed. In the rotary pressure dehydrator
At an intermediate position in the width direction of the filter chamber, a protrusion is disposed so as to protrude from the upper surface of the vertical restrictor toward the deflector or the inner spacer,
A rotary pressure dehydrator characterized in that a flocculant supply means is disposed at the rear stage of the filter chamber, and the flocculant can be supplied into the filter chamber.

The flocculant supply means is constituted by a flocculant flow path formed inside the outer spacer, and a nozzle that is disposed on the inner peripheral surface of the outer spacer and discharges the flocculant toward the filter chamber space. The rotary pressure dehydrator according to claim 7 or 8, characterized in that it is characterized by the following.

A flocculant supply means having a flocculant flow path formed inside the protrusion, and a nozzle arranged in a direction capable of releasing the flocculant in a direction opposite to the traveling direction of the object to be processed at a position upstream of the protrusion; And / or a nozzle arranged at a position downstream of the protrusion in a direction in which the flocculant can be discharged in the same direction as the traveling direction of the object to be processed. Item 9. A rotary pressure dehydrator according to Item 8.

A method for dehydrating a processing object using the rotary pressure dehydrator according to claim 1,
Before introducing into the rotary pressure dehydrator, add the inorganic flocculant to the object to be treated, then add the polymer flocculant, mix and stir to form a floc,
Introduce the processing object on which the flock is formed into the rotary pressurization dehydrator
A method for dewatering an object to be treated by a rotary pressure dehydrator, characterized in that an inorganic flocculant is supplied into the filter chamber by a flocculant supply means disposed at a rear stage of the filter chamber to perform dehydration.