JP3978661B2

JP3978661B2 - Gravity concentration dehydrator

Info

Publication number: JP3978661B2
Application number: JP2002313656A
Authority: JP
Inventors: 栄一石垣
Original assignee: Ishigaki Co Ltd
Current assignee: Ishigaki Co Ltd
Priority date: 2002-10-29
Filing date: 2002-10-29
Publication date: 2007-09-19
Anticipated expiration: 2022-10-29
Also published as: JP2004148147A

Description

【０００１】
【発明の属する技術分野】
この発明は、浄水汚泥などの無機系汚泥の濃縮脱水装置に関する。
【０００２】
【従来の技術】
従来、密閉槽を汚泥濃縮部と集液部に区画し、筒状フイルターエレメントを汚泥濃縮部に垂下して、汚泥流入管から汚泥を供給し、筒状フイルターエレメント内に透過したろ液を集液部から槽外に流出させ、逆円錐状とした濃縮汚泥排出部の排出管から濃縮汚泥を取出す装置は、特許文献１に記載してあるように公知である。
【０００３】
【特許文献１】
特開平７−６８１０７号公報（請求項１、図１）
【０００４】
【発明が解決しようとする課題】
従来の濃縮装置は、濃縮槽内の液面までがろ過水頭となっており、ろ過圧が低くスラッジが圧密されず、排水スラッジの水分が高く減量効果が少なかった。そして、ろ材としてフイルターエレメントを使用しているため、ろ材の再生が困難でろ過性能が悪くろ過時間が長くかかっていた。この発明は、上記の課題を解決するために、高い液面水頭による圧密と、槽内に設置したろ過筒による固液分離の相乗効果により、効率良く低含水率のケーキを得る重力濃縮脱水装置を提供することを目的とする。
【０００５】
【課題を解決するための手段】
この発明の要旨は、密閉状の濃縮槽にろ過筒を配設し、濃縮槽の上半部に汚泥の供給管と、槽底部に引抜き管を接続した濃縮装置において、濃縮槽の上半部にろ過筒を配設して濃縮ゾーンとし、濃縮槽の下半部を逆円錐状に形成して圧密ゾーンとすると共に、濃縮槽の上部にろ過圧保持筒を立設して、このろ過圧保持筒に配設した液面計を原液供給ポンプに連動連結したもので、一定に保たれたろ過圧で高い液面水頭が得られ、逆円錐状の槽底部に加わる圧力により沈殿スラッジが圧密され、低含水率の脱水ケーキが得られる。重力濃縮脱水装置の処理性能が高くなり、濃縮槽を小さくして、省スペースとなるものである。
【０００６】
濃縮槽の圧密ゾーンに配設した水分計と、槽底の引抜き管に介装した排出バルブを連動連結したもので、水分計のセンサーの数値により、濃縮ゾーンから適宜圧密されたスラッジを排出できる。
なお、引抜き管を接続した圧密ゾーンの槽底部に、スクリュー羽根を立設してもよく、高圧密されたスラッジや粘性を有する圧密スラッジは、スクリュー羽根で更に圧搾しながら排出できる。そして、濃縮槽の濃縮ゾーンにろ材をウエッジワイヤーで構成した多数のろ過筒を配設し、ろ過筒に連結したろ液管に逆洗ポンプを接続したもので、ろ過筒で多量のろ液が槽外へ排出され、効率良く濃縮が加速される。ウエッジワイヤーは目詰まりしにくく、逆洗ポンプでろ材面の洗浄が容易である。
【０００７】
【発明の実施の形態】
この発明に係る装置は上記のように構成してあり、濃縮槽に供給された汚泥は、ろ過圧によりろ過筒で固液分離が行なわれ、ろ過筒に流入した多量のろ液が槽外に抜出される。そして、ろ過筒のウエッジワイヤーに固形分が捕捉され、徐々に剥離されて沈降を始める。濃縮槽に供給された汚泥が、ろ過圧保持筒の液面計の上位水位レベルになると原液供給ポンプが停止され、低位レベルになると原液供給ポンプの運転が再開する。ろ過圧保持筒の液面計の液位レベルにより原液供給ポンプの運転と停止を繰返し、ろ過筒でのろ過は常時継続する。一定に保たれたろ過圧による液面水頭と圧密ゾーンの逆円錐形状により加わる圧力で、沈降スラッジは圧密が行われ、低含水率の脱水ケーキが得られる。濃縮槽の圧密ゾーンでは、水分計のセンサーの数値、あるいは、タイマーにより適時圧密されたスラッジを槽外に排出する。なお、排出にはスラッジの性状により排出バルブやスクリューを使用する。ろ過中にろ過筒からのろ液の抜出量が減少した時には、原液供給ポンプの運転を停止して、ろ液管に接続した逆洗ポンプから逆洗水をろ過筒に供給し、ウエッジワイヤーの内側からろ材を洗浄して再生を行なう。
【０００８】
【実施例】
この発明に係る浮上濃縮装置について、図面に基づき詳述すると、先ず図１は重力濃縮脱水装置の縦断面図であって、密閉状の濃縮槽１に複数のろ過筒２…を垂設した上半部の濃縮部１ａと、逆円錐状に形成した濃縮槽１の下半部の圧密部１ｂに形成して、濃縮槽１を濃縮ゾーンＡと圧密ゾーンＢに区分してある。密閉状の濃縮槽１の上部にろ過圧保持筒３が立設してあり、濃縮槽１とろ過圧保持筒３で濃縮脱水機１１を構成している。濃縮ゾーンＡの濃縮部１ａの側壁に汚泥の供給管４が連結してあり、供給管４の始端側に原液供給ポンプ５が連結してある。ろ過圧保持筒３に液面計６が配設してあり、原液供給ポンプ５とろ過圧保持筒３の液面計６が連動連結してある。液面計６には上位水位レベルＨＷＬと下位水位レベルＬＷＬを検知する電極棒６ａ、６ｂが配設してある。供給管４から濃縮槽１に供給された汚泥が、ろ過圧保持筒３の液面計６の上位水位レベルＨＷＬになると原液供給ポンプ５が停止され、低位レベルＬＷＬになると原液供給ポンプ５の運転が再開される。一定に保たれたろ過圧保持筒３のろ過圧で、濃縮槽１の圧密ゾーンＢでの高い液面水頭が得られる。
なお符号７、８は、原液の供給管４に設けた逆止弁と開閉弁である。
【０００９】
図１に示すように、濃縮ゾーンＡの濃縮部１ａに配設したそれぞれのろ過筒２…にはろ液管９の分岐管９ａが連結してあり、ろ液管９の後端部を濃縮槽１の槽外に抜き出してある。図２に示すように、ろ過筒は濃縮槽に均等に配列してある。ろ液管９の後端部に真空ポンプを連結しても、自然流下としてもよいものである。ろ液管９には逆洗ポンプ１０が接続してあり、ろ過筒９の内部に洗浄水を供給させる。ろ過中にろ過筒２からのろ液の抜出量が減少した時には、原液供給ポンプ５の運転を停止して、ろ液管９に接続した逆洗ポンプ１０から逆洗水を内側から供給し、ろ材の再生を行なう。ろ過筒２のろ材をウエッジワイヤーで構成すれば、金属ろ材であり、目詰まりしにくく、内部から洗浄水を噴射すれば、ろ材再生が完全に行なえる。なお、符号１７、１８は、ろ液管９と逆洗ポンプ１０の連結点の前後に設けた開閉弁であり、符号１９、２０は、逆洗ポンプ１０の近傍に設けた逆止弁と開閉弁である。
【００１０】
図１に示すように、圧密ゾーンＢの圧密部１ｂの逆円錐状に形成した槽底に引抜き管１２が連結してあり、引抜き管１２に排出バルブ１３が介装してある。
圧密部１ｂに水分計１４が取り付けてあり、水分計１４と排出バルブ１３が連動連結してある。水分計１４のセンサーの数値により、排出バルブ１３を解放し、適宜圧密ゾーンＢの圧密されたスラッジを引抜き管１２から排出する。濃縮脱水機１１は、ろ過圧保持筒３による高い液面水頭と逆円錐状の圧密部１ｂに加わる圧力により沈殿スラッジが圧密されて、圧密ゾーンＢに低含水率の脱水ケーキが得られる。ろ過圧が高いため処理性能が高くなり、濃縮槽を小さくして省スペースとなる。図３は他の実施例であって、引抜き管１２を接続した圧密ゾーンＢの逆円錐状の圧密部１ｂに、スクリュー羽根１５が立設してあり、駆動機１６に連結してある。高圧密されたスラッジや粘性を有する圧密スラッジは、スクリュー羽根１５で更に圧搾しながら排出できる。
【００１１】
濃縮脱水機１１は上記のように構成してあり、濃度３〜１０％の無機系スラリーを濃縮槽１の濃縮部１ａに供給すると、供給管４の近傍の濃縮ゾーンＡでは、スラリーは、まだ固液分離されずに水分が９０〜９７％である。ろ過圧により濃縮ゾーンＡのろ過筒２で固液分離が行なわれ、ろ過筒２に流入した多量のろ液が濃縮槽１の外部に抜出される。濃縮槽１に供給されたスラリーが、ろ過圧保持筒３の液面計６の上位水位レベルＨＷＬになると原液供給ポンプ５が停止され、低位レベルＬＷＬになると原液供給ポンプ５の運転が再開する。ろ過圧保持筒３の液面計６の液位レベルにより原液供給ポンプ５の運転と停止を繰返し、ろ過筒２でのろ過は常時継続する。ろ過筒２の近傍のスラリーは、水分が９０％から８０％に濃縮される。ろ過筒２のウエッジワイヤーに捕捉された固形分が、徐々に剥離されて圧密ゾーンＢに沈降を始める。
【００１２】
圧密ゾーンＢの上部では沈降してきた固形物が濃縮されて水分が７５％となり、沈降するにしたがって水分が７０％に圧密される。圧密ゾーンＢの槽底では更に圧密されて含水率が６５％に脱水される。圧密ゾーンＢにおいて、ろ過圧保持筒３による高い液面水頭と逆円錐状の圧密部１ｂに加わる圧力により沈殿スラッジが圧密されて、低含水率の脱水ケーキが得られる。濃縮槽１の圧密ゾーンＢでは、水分計１４のセンサーの数値、あるいは、タイマーにより適時圧密されたスラッジを槽外に排出する。なお、スラッジの性状により排出バルブ１３やスクリュー１５を使用する。ろ過中にろ過筒２からのろ液の抜出量が減少した時には、原液供給ポンプ５の運転を停止して、ろ液管９の開閉弁１８を閉じ、逆止弁１９と開閉弁２０解放して逆洗ポンプ１０から逆洗水をろ過筒２の内側から供給すれば、ろ材の再生が行なえる。
【００１３】
【発明の効果】
以上のように、この発明に係る重力濃縮脱水装置は、高い液面水頭による圧密と、槽内に設置したろ過筒による固液分離の相乗効果により、効率良く低含水率のケーキを得ることができる。即ち、従来の濃縮装置は、ろ過水頭が低いため排水スラッジの減量効果が少なく、ろ材の再生も困難で、ろ過性能が悪かったものであるが、この発明にあっては、ろ過筒を配設した濃縮ゾーンと、逆円錐状に形成した圧密ゾーンとから構成した濃縮槽の上部に、液面計を配設したろ過圧保持筒を立設して、液面計を原液供給ポンプに連動連結したもので、一定に保たれたろ過圧で高い液面水頭が得られ、逆円錐状の槽底部に加わる圧力により沈殿スラッジが圧密され、低含水率の脱水ケーキが得られる。逆円錐状の槽底部に加わる圧力により沈殿スラッジが圧密されて、圧密ゾーンで低含水率の脱水ケーキが得られる。重力濃縮脱水装置の処理性能が高くなり、濃縮槽を小さくして、省スペースとなるものである。
【００１４】
濃縮槽の圧密ゾーンに設けた水分計と、脱水ケーキの引抜き管に介装した排出バルブを連動連結したので、濃縮ゾーンに取り付けた水分計のセンサーの数値により、適宜圧密ゾーンの圧密されたスラッジを排出できる。なお、高圧密されたスラッジや粘性を有する圧密スラッジには、圧密ゾーンの槽底部にスクリュー羽根を立設してもよく、スクリュー羽根で更に圧搾しながら排出できる。ろ材をウエッジワイヤーで構成したろ過筒を濃縮ゾーンに配設し、ろ過筒のろ液管に逆洗ポンプを接続したので、ろ過筒で多量のろ液が槽外へ排出され、効率良く濃縮が加速される。ウエッジワイヤーは目詰まりしにくく、逆洗ポンプでろ材面の洗浄が容易である。
【図面の簡単な説明】
【図１】この発明に係る重力濃縮脱水装置の縦断面図である。
【図２】濃縮装置の濃縮部の横断面図である。
【図３】濃縮装置の圧密部の縦断面図である。
【符号の説明】
１濃縮槽
２ろ過筒
３ろ過圧保持筒
４供給管
５原液供給ポンプ
６液面計
９ろ液管
１０逆洗ポンプ
１２引抜き管
１３排出バルブ
１４水分計
１５スクリュー羽根
Ａ濃縮ゾーン
Ｂ圧密ゾーン[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a concentration and dewatering device for inorganic sludge such as purified water sludge.
[0002]
[Prior art]
Conventionally, the sealed tank is divided into a sludge concentrating part and a liquid collecting part, the cylindrical filter element is suspended in the sludge concentrating part, sludge is supplied from the sludge inflow pipe, and the filtrate permeated into the cylindrical filter element is collected. An apparatus for taking out concentrated sludge from a discharge pipe of a concentrated sludge discharge section which is made to flow out of a tank from a liquid section and has an inverted conical shape is known as described in Patent Document 1.
[0003]
[Patent Document 1]
JP-A-7-68107 (Claim 1, FIG. 1)
[0004]
[Problems to be solved by the invention]
In the conventional concentrating device, the liquid level in the concentrating tank is the head of filtration, the filtration pressure is low and the sludge is not compacted, the water content of the drainage sludge is high, and the reduction effect is small. And since the filter element is used as the filter medium, it is difficult to regenerate the filter medium, the filtration performance is poor and the filtration time is long. In order to solve the above problems, the present invention provides a gravity concentration dehydration apparatus that efficiently obtains a cake having a low water content by the synergistic effect of compaction by a high liquid surface head and solid-liquid separation by a filter cylinder installed in the tank. The purpose is to provide.
[0005]
[Means for Solving the Problems]
The gist of the present invention is that, in a concentrating apparatus in which a filtration cylinder is disposed in a closed concentration tank, a sludge supply pipe is connected to the upper half of the concentration tank, and a drawing pipe is connected to the bottom of the tank, the upper half of the concentration tank A filtration cylinder is provided to form a concentration zone, and the lower half of the concentration tank is formed into an inverted conical shape to form a consolidation zone, and a filtration pressure holding cylinder is erected at the top of the concentration tank. A liquid level gauge arranged in the holding cylinder is linked to the stock solution supply pump, and a high liquid level head is obtained with the filtration pressure kept constant, and the sediment sludge is consolidated by the pressure applied to the bottom of the inverted conical tank. Thus, a dehydrated cake having a low water content can be obtained. The processing performance of the gravity concentration dehydration apparatus is improved, and the concentration tank is made smaller to save space.
[0006]
A moisture meter arranged in the consolidation zone of the concentration tank and a discharge valve intervened in the drawing tube at the bottom of the tank are linked to each other, and sludge that has been properly consolidated can be discharged from the concentration zone according to the sensor value of the moisture meter. .
Note that a screw blade may be erected at the bottom of the compaction zone connected to the drawing pipe, and the high-pressure-condensed sludge and the compacted sludge having viscosity can be discharged while further compressed by the screw blade. A large number of filtration tubes made of wedge wire are arranged in the concentration zone of the concentration tank, and a backwash pump is connected to the filtrate tube connected to the filtration tube. It is discharged out of the tank and the concentration is accelerated efficiently. The wedge wire is less likely to clog, and the filter medium surface can be easily cleaned with a backwash pump.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
The apparatus according to the present invention is configured as described above, and the sludge supplied to the concentration tank is subjected to solid-liquid separation by a filtration cylinder by filtration pressure, and a large amount of filtrate flowing into the filtration cylinder is outside the tank. Extracted. And solid content is capture | acquired by the wedge wire of a filtration cylinder, and it peels gradually and begins to settle. When the sludge supplied to the concentration tank reaches the upper water level of the level gauge of the filtration pressure holding cylinder, the stock solution supply pump is stopped, and when the sludge is lowered, the operation of the stock solution supply pump is resumed. The stock solution supply pump is repeatedly operated and stopped according to the level of the level gauge of the filtration pressure holding cylinder, and the filtration in the filtration cylinder is always continued. The sedimentation sludge is consolidated by the pressure applied by the liquid head and the inverted conical shape of the consolidation zone due to the filtration pressure kept constant, and a dehydrated cake with a low water content is obtained. In the consolidation zone of the concentrating tank, the value of the sensor of the moisture meter or the sludge that has been consolidated in a timely manner by the timer is discharged out of the tank. For discharge, a discharge valve or screw is used depending on the properties of the sludge. When the amount of filtrate extracted from the filtration cylinder decreases during filtration, the operation of the stock solution supply pump is stopped and backwash water is supplied from the backwash pump connected to the filtrate pipe to the filtration cylinder. Wash the filter media from the inside and regenerate.
[0008]
【Example】
The levitation concentration apparatus according to the present invention will be described in detail with reference to the drawings. First, FIG. 1 is a longitudinal sectional view of a gravity concentration dehydration apparatus, in which a plurality of filter cylinders 2. The concentration tank 1 is divided into a concentration zone A and a consolidation zone B by forming a half concentration section 1a and a consolidation section 1b in the lower half of the concentration tank 1 formed in an inverted conical shape. A filtration pressure holding cylinder 3 is erected on the top of the closed concentration tank 1, and the concentration tank 1 and the filtration pressure holding cylinder 3 constitute a concentration dehydrator 11. A sludge supply pipe 4 is connected to the side wall of the concentration section 1 a of the concentration zone A, and a stock solution supply pump 5 is connected to the start end side of the supply pipe 4. A liquid level gauge 6 is disposed in the filtration pressure holding cylinder 3, and the stock solution supply pump 5 and the liquid level gauge 6 of the filtration pressure holding cylinder 3 are linked to each other. The liquid level gauge 6 is provided with electrode rods 6a and 6b for detecting the upper water level HWL and the lower water level LWL. When the sludge supplied from the supply pipe 4 to the concentration tank 1 reaches the upper water level HWL of the liquid level gauge 6 of the filtration pressure holding cylinder 3, the raw liquid supply pump 5 is stopped, and when the sludge is at the lower level LWL, the operation of the raw liquid supply pump 5 is performed. Is resumed. With the filtration pressure of the filtration pressure holding cylinder 3 kept constant, a high liquid surface head in the consolidation zone B of the concentration tank 1 is obtained.
Reference numerals 7 and 8 are a check valve and an on-off valve provided in the supply pipe 4 for the stock solution.
[0009]
As shown in FIG. 1, a branch pipe 9a of a filtrate pipe 9 is connected to each of the filter cylinders 2 ... arranged in the concentration section 1a of the concentration zone A, and the rear end of the filtrate pipe 9 is connected to a concentration tank. 1 is taken out of the tank. As shown in FIG. 2, the filtration cylinders are evenly arranged in the concentration tank. Even if a vacuum pump is connected to the rear end portion of the filtrate tube 9, it may be natural flow. A backwash pump 10 is connected to the filtrate tube 9, and wash water is supplied into the filter tube 9. When the amount of filtrate extracted from the filter cylinder 2 decreases during filtration, the operation of the stock solution supply pump 5 is stopped, and backwash water is supplied from the backwash pump 10 connected to the filtrate pipe 9 from the inside. Regenerate the filter media. If the filter medium of the filter cylinder 2 is composed of a wedge wire, it is a metal filter medium and is not easily clogged. If the washing water is sprayed from the inside, the filter medium can be completely regenerated. Reference numerals 17 and 18 are open / close valves provided before and after the connection point of the filtrate pipe 9 and the backwash pump 10, and reference numerals 19 and 20 are open / close valves provided near the backwash pump 10. It is a valve.
[0010]
As shown in FIG. 1, a drawing pipe 12 is connected to a tank bottom formed in an inverted conical shape of the consolidation portion 1 b of the consolidation zone B, and a discharge valve 13 is interposed in the drawing pipe 12.
A moisture meter 14 is attached to the compacted portion 1b, and the moisture meter 14 and the discharge valve 13 are linked to each other. Depending on the value of the sensor of the moisture meter 14, the discharge valve 13 is released, and the consolidated sludge in the consolidation zone B is discharged from the extraction pipe 12 as appropriate. In the concentration dehydrator 11, the sediment sludge is consolidated by the pressure applied to the high liquid level head by the filtration pressure holding cylinder 3 and the inverted conical compaction portion 1 b, and a dehydrated cake having a low water content is obtained in the consolidation zone B. Since the filtration pressure is high, the processing performance is high, and the concentrating tank is made small, saving space. FIG. 3 shows another embodiment, in which a screw blade 15 is erected on an inverted conical compaction portion 1 b of a compaction zone B to which a drawing tube 12 is connected, and is connected to a drive unit 16. The high-pressure-condensed sludge and the compacted sludge having viscosity can be discharged while being further squeezed by the screw blade 15.
[0011]
The concentration dehydrator 11 is configured as described above. When an inorganic slurry having a concentration of 3 to 10% is supplied to the concentration unit 1a of the concentration tank 1, the slurry is still in the concentration zone A in the vicinity of the supply pipe 4. The water content is 90 to 97% without solid-liquid separation. Solid-liquid separation is performed by the filtration cylinder 2 in the concentration zone A by the filtration pressure, and a large amount of filtrate that has flowed into the filtration cylinder 2 is drawn out of the concentration tank 1. When the slurry supplied to the concentration tank 1 reaches the upper water level HWL of the liquid level gauge 6 of the filtration pressure holding cylinder 3, the stock solution supply pump 5 is stopped, and when the slurry reaches the lower level LWL, the operation of the stock solution supply pump 5 is resumed. The stock solution supply pump 5 is repeatedly operated and stopped according to the liquid level of the level gauge 6 of the filtration pressure holding cylinder 3, and the filtration in the filtration cylinder 2 is continuously continued. In the slurry in the vicinity of the filter cylinder 2, the moisture is concentrated from 90% to 80%. The solid content captured by the wedge wire of the filter cylinder 2 is gradually peeled off and starts to settle in the consolidation zone B.
[0012]
In the upper part of the consolidation zone B, the solid matter that has settled is concentrated to a moisture content of 75%, and the moisture is consolidated to 70% as it settles. The bottom of the consolidation zone B is further consolidated and dehydrated to a moisture content of 65%. In the consolidation zone B, the sediment sludge is consolidated by the pressure applied to the high liquid head and the inverted conical compaction portion 1b by the filtration pressure retaining cylinder 3, and a dehydrated cake having a low water content is obtained. In the consolidation zone B of the concentration tank 1, sludge that has been compacted in a timely manner by the numerical value of the sensor of the moisture meter 14 or a timer is discharged out of the tank. A discharge valve 13 and a screw 15 are used depending on the properties of the sludge. When the amount of filtrate extracted from the filtration cylinder 2 decreases during filtration, the operation of the stock solution supply pump 5 is stopped, the on-off valve 18 of the filtrate pipe 9 is closed, and the check valve 19 and on-off valve 20 are released. If the backwash water is supplied from the backside of the filter cylinder 2 from the backwash pump 10, the filter medium can be regenerated.
[0013]
【The invention's effect】
As described above, the gravity concentration dehydration apparatus according to the present invention can efficiently obtain a cake having a low water content by the synergistic effect of consolidation by a high liquid surface head and solid-liquid separation by a filter cylinder installed in the tank. it can. In other words, the conventional concentrator has a low filtration head, so the drainage sludge is less effective, the filter medium is difficult to regenerate, and the filtration performance is poor. A filtration pressure holding cylinder with a liquid level gauge is set up on the upper part of the concentration tank, which is composed of a concentrated zone and a conical zone formed in an inverted conical shape, and the liquid level gauge is linked to the stock solution supply pump. Thus, a high liquid surface head is obtained with the filtration pressure kept constant, and the sediment sludge is consolidated by the pressure applied to the bottom of the inverted conical tank, and a dehydrated cake having a low water content is obtained. The sediment sludge is consolidated by the pressure applied to the inverted conical tank bottom, and a dehydrated cake having a low water content is obtained in the consolidation zone. The processing performance of the gravity concentration dehydration apparatus is improved, and the concentration tank is made smaller to save space.
[0014]
Since the moisture meter provided in the consolidation zone of the concentrating tank and the discharge valve interposed in the drawing tube of the dewatered cake are linked and connected, depending on the value of the sensor of the moisture meter attached to the concentration zone, the compacted sludge in the compaction zone is appropriately consolidated Can be discharged. It should be noted that a screw blade may be erected on the bottom of the tank of the consolidation zone for the high-pressure-condensed sludge and the viscous consolidated sludge, and can be discharged while being further squeezed with the screw blade. A filter cylinder made of wedge wire is installed in the concentration zone, and a backwash pump is connected to the filtrate tube of the filter cylinder, so a large amount of filtrate is discharged out of the tank through the filter cylinder, allowing efficient concentration. Accelerated. The wedge wire is less likely to clog, and the filter medium surface can be easily cleaned with a backwash pump.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a gravity concentration dehydration apparatus according to the present invention.
FIG. 2 is a cross-sectional view of a concentration unit of the concentration device.
FIG. 3 is a vertical cross-sectional view of a consolidation unit of the concentrator.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Concentration tank 2 Filtration cylinder 3 Filtration pressure holding cylinder 4 Supply pipe 5 Stock solution supply pump 6 Liquid level gauge 9 Filtrate pipe 10 Backwash pump 12 Pull-out pipe 13 Discharge valve 14 Moisture meter 15 Screw blade A Concentration zone B Consolidation zone

Claims

Concentration in which a filtration cylinder (2) is arranged in a closed concentration tank (1), a sludge supply pipe (4) is connected to the upper half of the concentration tank (1), and a drawing pipe (12) is connected to the bottom of the tank. In the apparatus, a filtration cylinder (2) is arranged in the upper half of the concentration tank (1) to form a concentration zone (A), and the lower half of the concentration tank (1) is formed in an inverted conical shape. B), and a filtration pressure holding cylinder (3) is erected on the upper part of the concentration tank (1), and the liquid level gauge (6) disposed in the filtration pressure holding cylinder (3) is used as a stock solution supply pump ( 5) Gravity concentration dehydration apparatus characterized by being linked to 5).

The moisture meter (14) disposed in the consolidation zone (B) of the concentration tank (1) and a discharge valve (13) interposed in the extraction pipe (12) at the bottom of the tank are interlocked and connected. Item 2. The gravity concentration dewatering device according to Item 1.

The gravity concentration dehydration apparatus according to claim 1, wherein a screw blade (15) is erected on the bottom of the consolidation zone (B) to which the drawing tube (12) is connected.

A large number of filter cylinders (2) in which the filter medium is composed of wedge wires are arranged in the concentration zone (A) of the concentration tank (1), and the backwash pump is connected to the filtrate pipe (9) connected to the filter cylinder (2). The gravity concentration dehydration apparatus according to any one of claims 1 to 3, wherein (10) is connected.