JP6622126B2 - Sewage sludge concentrator - Google Patents
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- JP6622126B2 JP6622126B2 JP2016060392A JP2016060392A JP6622126B2 JP 6622126 B2 JP6622126 B2 JP 6622126B2 JP 2016060392 A JP2016060392 A JP 2016060392A JP 2016060392 A JP2016060392 A JP 2016060392A JP 6622126 B2 JP6622126 B2 JP 6622126B2
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Description
本発明は、下水汚泥を一定濃度に濃縮する回転ドラム式の下水汚泥濃縮機に関する。 The present invention relates to a rotary drum type sewage sludge concentrator for concentrating sewage sludge to a constant concentration.
下水処理施設において発生する下水汚泥は、水分量が多いため最終的に焼却処理等するまでの間に、濃縮処理と脱水処理が行われている。
濃縮処理は、下水汚泥を一定濃度に濃縮する工程であり、一般に遠心濃縮装置又は回転ドラム式濃縮装置を用いて行っている。
Since the sewage sludge generated in the sewage treatment facility has a large amount of water, concentration treatment and dehydration treatment are performed until the final incineration treatment or the like.
The concentration treatment is a step of concentrating sewage sludge to a constant concentration, and is generally performed using a centrifugal concentration device or a rotary drum type concentration device.
従来の回転ドラム式濃縮装置は、円筒状のスクリーン本体を水平軸回りに回転させる構成である。そして回転するスクリーン本体の一端側から下水汚泥を投入すると、スクリーン本体の他端側へと移動する際に固液分離されて濃縮し、他端側から排出される。このとき、スクリーンの目詰まりを防止するため、スクリーン本体の上方に取り付けた洗浄手段から洗浄水を噴射して洗浄している（例えば、特許文献１に開示）。 A conventional rotary drum type concentrator is configured to rotate a cylindrical screen body about a horizontal axis. Then, when sewage sludge is introduced from one end side of the rotating screen body, it is separated into a solid and liquid when concentrated to move to the other end side of the screen body, and is discharged from the other end side. At this time, in order to prevent clogging of the screen, cleaning is performed by spraying cleaning water from cleaning means attached above the screen body (for example, disclosed in Patent Document 1).
回転ドラム式濃縮装置において、スクリーン本体の一端の供給口側に供給された下水汚泥は、水分量が多いため固形物と水の固液分離率が高い。一方、スクリーン本体の他端の排出口側の下水汚泥は、濃縮が進行して一定の濃度となり固液分離率が低くなっている。また排出口側では一定濃度に濃縮された固形物が塊状となり、ろ過される水及びスクリーンの目詰まりも少なくなっている。 In the rotary drum type concentrator, the sewage sludge supplied to the supply port side at one end of the screen main body has a high moisture content, so that the solid-liquid separation rate of solids and water is high. On the other hand, the sewage sludge on the discharge port side at the other end of the screen body has a constant concentration as the concentration proceeds, and the solid-liquid separation rate is low. Further, the solid matter concentrated to a constant concentration becomes agglomerated on the outlet side, and the clogged water and screen are less clogged.
しかしながら、従来の回転ドラム式濃縮装置では、下水汚泥の濃縮汚泥濃度が低下しないように洗浄手段の洗浄水量を設定しているが、噴射する洗浄水量を供給口側と排出口側で均等に噴射している。このため、供給口側と同じ洗浄水量を排出口側でも噴射させると過剰となり、スクリーン本体の内部に入った洗浄水によって一定濃度に濃縮させた下水汚泥の濃縮汚泥濃度が低下する要因となっていた。 However, in the conventional rotary drum type concentrator, the cleaning water amount of the cleaning means is set so that the concentrated sludge concentration of the sewage sludge does not decrease, but the cleaning water amount to be injected is injected evenly on the supply port side and the discharge port side. are doing. For this reason, if the same amount of washing water as that on the supply port side is also injected on the discharge port side, it becomes excessive, and this is a factor that reduces the concentration of concentrated sludge in the sewage sludge concentrated to a certain concentration by the washing water entering the inside of the screen body. It was.
また特許文献１に開示の装置は、洗浄水の水圧又は水量を通常時と一定時間で切り替えて変化させているが、供給口側と排出口側の水量は均一の状態であり何ら変わるものではない。 In addition, the apparatus disclosed in Patent Document 1 changes the water pressure or amount of washing water by switching between normal time and a fixed time, but the amount of water on the supply port side and the discharge port side is in a uniform state and does not change at all. Absent.
本発明は上記従来技術の問題点に鑑み、スクリーン洗浄により下水汚泥の濃縮汚泥濃度を低下させることなく効率的に濃縮することができる下水汚泥濃縮機を提供することを目的としている。 An object of the present invention is to provide a sewage sludge concentrator capable of efficiently concentrating without reducing the concentrated sludge concentration of sewage sludge by screen cleaning in view of the above-described problems of the prior art.
上記課題を解決するため第１の手段として、本発明は、円筒状のスクリーン本体を有し、水平軸回りに回転して一端の供給口から汚泥を供給して他端の排出口から濃縮汚泥を排出する水切スクリーンと、前記水切スクリーンの上方で前記スクリーン本体の水平軸方向に沿って洗浄水を噴射する洗浄手段を備え、前記洗浄手段は、前記スクリーン本体の供給口側よりも排出口側の水量を少なくする水量調整部を設けたことを特徴とする下水汚泥濃縮機を提供することにある。
上記第１の手段によれば、スクリーン本体の排出口側に噴射した洗浄水によって下水汚泥が希釈されることがなく、濃縮汚泥濃度の低下を防止して一定濃度の下水汚泥を排出することができる。
As a first means for solving the above problems, the present invention has a cylindrical screen body, rotates around a horizontal axis, supplies sludge from one supply port, and concentrates sludge from the other discharge port. And a cleaning means for injecting cleaning water along the horizontal axis direction of the screen main body above the draining screen, and the cleaning means is on the outlet side of the supply side of the screen body. Another object of the present invention is to provide a sewage sludge concentrator provided with a water amount adjusting unit for reducing the amount of water.
According to the first means, the sewage sludge is not diluted by the washing water sprayed to the discharge port side of the screen main body, the concentration sludge concentration is prevented from decreasing and the sewage sludge having a constant concentration is discharged. it can.
上記課題を解決するため第２の手段として、本発明は、前記第１の手段において、前記水量調整部は、前記スクリーン本体の前記供給口よりも前記排出口側の前記洗浄手段の洗浄ノズルの孔径を小さくしていることを特徴とする下水汚泥濃縮機を提供することにある。
上記第２の手段によれば、スクリーン本体の排出口側に噴射した洗浄水によって下水汚泥が希釈されることがなく、濃縮汚泥濃度の低下を防止して一定濃度の下水汚泥を排出することができる。
In order to solve the above-mentioned problem, as a second means, the present invention provides the cleaning means of the cleaning means of the cleaning means in the first means, wherein the water amount adjusting unit is closer to the discharge port than the supply port of the screen body. An object of the present invention is to provide a sewage sludge concentrator characterized by having a small pore size.
According to the second means, the sewage sludge is not diluted by the wash water sprayed to the discharge port side of the screen main body, and the concentration sludge concentration is prevented from decreasing and the sewage sludge having a constant concentration is discharged. it can.
上記課題を解決するため第３の手段として、本発明は、前記第１の手段において、前記水量調整部は、前記スクリーン本体の前記供給口から前記排出口側に向けて前記洗浄手段の洗浄ノズルの孔径を段階的に小さくしていることを特徴とする下水汚泥濃縮機を提供することにある。
上記第３の手段によれば、スクリーン本体の排出口側に噴射した洗浄水によって下水汚泥が希釈されることがなく、濃縮汚泥濃度の低下を防止して一定濃度の下水汚泥を排出することができる。また、下水汚泥の固液分離に合わせてスクリーン本体に適量の洗浄水を供給することができる。
As a third means for solving the above-mentioned problem, the present invention provides the cleaning nozzle of the cleaning means according to the first means, wherein the water amount adjusting unit is directed from the supply port of the screen body toward the discharge port. Another object of the present invention is to provide a sewage sludge concentrator characterized in that the pore diameter of the sewage is gradually reduced.
According to the third means, the sewage sludge is not diluted by the cleaning water sprayed to the discharge port side of the screen body, and the concentration sludge concentration is prevented from being lowered and discharged at a constant concentration. it can. In addition, an appropriate amount of washing water can be supplied to the screen body in accordance with the solid-liquid separation of the sewage sludge.
上記課題を解決するため第４の手段として、本発明は、前記第１ないし第３のいずれか１の手段において、前記水量調整部は、前記スクリーン本体の前記排出口側の前記洗浄手段の洗浄ノズルを間欠噴射させることを特徴とする下水汚泥濃縮機を提供することにある。
上記第４の手段によれば、スクリーン本体の排出口側に噴射した洗浄水によって下水汚泥が希釈されることがなく、濃縮汚泥濃度の低下を防止して一定濃度の下水汚泥を排出することができる。また、一時的に排出口側に洗浄水を噴射しないため、洗浄水による濃縮汚泥の希釈化を効率的に防止できる。
In order to solve the above problem, as a fourth means, the present invention provides the method according to any one of the first to third means, wherein the water amount adjustment unit is configured to wash the washing means on the outlet side of the screen body. An object of the present invention is to provide a sewage sludge concentrator characterized by intermittent injection of nozzles.
According to the fourth means, the sewage sludge is not diluted by the washing water sprayed to the discharge port side of the screen main body, the concentration sludge concentration is prevented from decreasing and the sewage sludge having a constant concentration is discharged. it can. In addition, since the cleaning water is not temporarily ejected to the discharge port side, the dilution of the concentrated sludge with the cleaning water can be efficiently prevented.
上記課題を解決するため第５の手段として、本発明は、前記第１ないし第４のいずれか１の手段において、前記水量調整部は、前記スクリーン本体の前記供給口から前記排出口側に向けて前記洗浄手段の前記洗浄ノズルの取り付け間隔を段階的に広く設定していることを特徴とする下水汚泥濃縮機を提供することにある。
上記第５の手段によれば、スクリーン本体の排出口側に噴射した洗浄水によって下水汚泥が希釈されることがなく、濃縮汚泥濃度の低下を防止して一定濃度の下水汚泥を排出することができる。
As a fifth means for solving the above-mentioned problems, the present invention provides the method according to any one of the first to fourth means, wherein the water amount adjusting unit is directed from the supply port of the screen body toward the discharge port side. It is another object of the present invention to provide a sewage sludge concentrator characterized in that the interval between attachments of the cleaning nozzle of the cleaning means is set wide stepwise.
According to the fifth means, the sewage sludge is not diluted by the wash water sprayed to the discharge port side of the screen main body, and it is possible to discharge the sewage sludge at a constant concentration by preventing the concentration sludge from decreasing. it can.
上記構成のような本発明によれば、スクリーン本体の排出口側に噴射した洗浄水によって下水汚泥が希釈されることがなく、濃縮汚泥濃度の低下を防止して一定濃度の下水汚泥を排出することができる。また洗浄手段の洗浄水量、下水汚泥の濃縮処理時間を低減できランニングコストを抑えることができる。 According to the present invention having the above-described configuration, the sewage sludge is not diluted by the washing water sprayed to the discharge port side of the screen body, and the sewage sludge having a constant concentration is discharged while preventing the concentration of the concentrated sludge from decreasing. be able to. In addition, the amount of cleaning water in the cleaning means and the time for concentrating sewage sludge can be reduced, and running costs can be reduced.
本発明の下水汚泥濃縮機の実施形態を添付の図面を参照しながら、以下詳細に説明する。 Embodiments of the sewage sludge concentrator of the present invention will be described below in detail with reference to the accompanying drawings.
［下水汚泥濃縮機１０］
図１は本発明の下水汚泥濃縮機の構成概略を示す説明図である。図示のように本発明の下水汚泥濃縮装置１０は、水切スクリーン２０と洗浄手段４０を基本構成としている。
水切スクリーン２０は、円筒状のスクリーン本体２２を有している。スクリーン本体２２は、金属製ウェッジワイヤーやパンチングメタルなどを用いて円筒状に形成し、駆動部（不図示）により水平軸回りに回転させている。そしてスクリーン本体２２の一端開口は下水汚泥の供給口２４となり、他端開口は濃縮汚泥の排出口２６となり、スクリーン本体２２の長手方向に沿って移動する下水汚泥に含まれる固形物と水を固液分離している。
[Sewage sludge concentrator 10]
FIG. 1 is an explanatory diagram showing a schematic configuration of a sewage sludge concentrator of the present invention. As shown in the figure, the sewage sludge concentrating device 10 of the present invention has a drainage screen 20 and a cleaning means 40 as a basic configuration.
The draining screen 20 has a cylindrical screen body 22. The screen body 22 is formed in a cylindrical shape using a metal wedge wire, punching metal, or the like, and is rotated around a horizontal axis by a drive unit (not shown). One end opening of the screen body 22 serves as a sewage sludge supply port 24, and the other end opening serves as a concentrated sludge discharge port 26, which solidifies solids and water contained in the sewage sludge moving along the longitudinal direction of the screen body 22. Liquid separation.
供給口２４側には水平軸方向に沿って排出口に向かって延出した汚泥供給部２８を取り付けている。汚泥供給部２８は、水処理施設の沈澱池などから発生した下水汚泥の供給管である。
排出口２６側には排出シュート２９を取り付けている。排出シュート２９は、濃縮汚泥を後段の脱水処理装置へ排出している。
A sludge supply unit 28 extending toward the discharge port along the horizontal axis direction is attached to the supply port 24 side. The sludge supply unit 28 is a supply pipe for sewage sludge generated from a settling pond of a water treatment facility.
A discharge chute 29 is attached to the discharge port 26 side. The discharge chute 29 discharges the concentrated sludge to a subsequent dewatering apparatus.
また、スクリーン本体２２の内周面には、軸方向に沿って汚泥移送用スパイラル３０を取り付けている。汚泥移送用スパイラル３０は、スクリーン本体２２の回転方向と逆方向となるらせん状に形成されており、スクリーン本体２２中を移動する下水汚泥を押し戻す方向に回転して濃縮に要する処理時間を長くすることができる。 A sludge transfer spiral 30 is attached to the inner peripheral surface of the screen body 22 along the axial direction. The sludge transfer spiral 30 is formed in a spiral shape opposite to the rotation direction of the screen body 22, and rotates in a direction to push back the sewage sludge moving through the screen body 22, thereby extending the processing time required for concentration. be able to.
洗浄手段４０は、スクリーン本体２２の上方で軸方向に沿って取り付けた洗浄水の供給管であり、下方のスクリーン本体２２に向けて洗浄水を噴射する洗浄ノズル４２を複数取り付けている。本発明の洗浄手段４０は、スクリーン本体２２の供給口２４側よりも排出口２６側の洗浄水の水量を少なくする水量調整部４４を取り付けている。 The cleaning means 40 is a cleaning water supply pipe that is attached along the axial direction above the screen main body 22, and has a plurality of cleaning nozzles 42 that spray the cleaning water toward the lower screen main body 22. The cleaning means 40 of the present invention is provided with a water amount adjusting unit 44 that reduces the amount of cleaning water on the discharge port 26 side rather than the supply port 24 side of the screen body 22.
図１に示す水量調整部４４は、スクリーン本体２２の供給口２４側よりも排出口２６側の洗浄ノズルの孔径を小さくしたものである。本発明の排出口側の洗浄手段とは、スクリーン本体２２の長手方向の半分から排出口２６までの間に設けた洗浄手段４０をいう。このような水量調整部４４は、排出口２６側の末端から供給口２４側に向けて１つ目までの洗浄ノズル４２の孔径のみ小さくする構成のほか、図２に示すように、供給口２４側から排出口２６に向けて洗浄ノズル４２の孔径を段階的に小さくする構成を採用することができる。 The water amount adjusting unit 44 shown in FIG. 1 has a smaller cleaning nozzle diameter on the discharge port 26 side than on the supply port 24 side of the screen body 22. The cleaning means on the discharge port side of the present invention refers to the cleaning means 40 provided between the half of the screen body 22 in the longitudinal direction and the discharge port 26. Such a water amount adjusting unit 44 is configured to reduce only the hole diameter of the first cleaning nozzle 42 from the end on the discharge port 26 side to the supply port 24 side, as shown in FIG. A configuration in which the hole diameter of the cleaning nozzle 42 is gradually reduced from the side toward the discharge port 26 can be employed.
また図３に示す水量調整部４４は、排出口２６側の末端から供給口２４側に向けて１つ目までの洗浄ノズル４２を間欠噴射させている。即ち供給口側の洗浄ノズルの噴射は常時行っており、排出側の２つの洗浄ノズル４２の噴射は一定時間ごとに噴射するように設定している。 Further, the water amount adjustment unit 44 shown in FIG. 3 intermittently ejects the first cleaning nozzle 42 from the end on the discharge port 26 side toward the supply port 24 side. That is, the cleaning nozzle on the supply port side is always sprayed, and the two cleaning nozzles 42 on the discharge side are set to spray at regular intervals.
また図４に示す水量調整部４４は、供給口２４から排出口２６側に向けて洗浄ノズル４２の取り付け間隔を段階的に広く設定している。即ち図示のように供給口２４から排出口２６に向けて洗浄ノズル４２の取り付け間隔ａ，ｂ，ｃ，ｄをａ＜ｂ＜ｃ＜ｄとなるように設定している。 In addition, the water amount adjustment unit 44 shown in FIG. 4 sets the mounting interval of the cleaning nozzle 42 wider stepwise from the supply port 24 toward the discharge port 26. That is, as shown in the figure, the attachment intervals a, b, c, and d of the cleaning nozzle 42 are set from the supply port 24 toward the discharge port 26 so that a <b <c <d.
［作用］
上記構成による本発明の下水汚泥濃縮機の作用について、以下説明する。
水処理施設で発生した下水汚泥が汚泥供給部２８からスクリーン本体２２の供給口２４へ供給されると、スクリーン本体２２の回転に伴って排出口２６側へ移動する際に固形物と水の固液分離が行われる。固形物はスクリーン本体２２上に残り、ろ過された水はスクリーン本体２２の外部へ排出される。スクリーン本体２２の内周面に取り付けた汚泥移送用スパイラル３０により供給口２４から排出口２６へと移動する下水汚泥を供給口２４側へ押し戻す方向に回転して濃縮に要する処理時間を長くしている。そして濃縮された一定濃度の濃縮汚泥が排出口２６から排出シュート２９を介して後段の脱水処理装置へ排出される。
[Action]
The operation of the sewage sludge concentrator of the present invention having the above configuration will be described below.
When the sewage sludge generated in the water treatment facility is supplied from the sludge supply unit 28 to the supply port 24 of the screen body 22, the solids and water are solidified when moving toward the discharge port 26 as the screen body 22 rotates. Liquid separation is performed. The solid matter remains on the screen main body 22, and the filtered water is discharged to the outside of the screen main body 22. The sludge transfer spiral 30 attached to the inner peripheral surface of the screen body 22 rotates the sewage sludge moving from the supply port 24 to the discharge port 26 in the direction to push it back to the supply port 24 side, thereby increasing the processing time required for concentration. Yes. Then, the concentrated sludge having a constant concentration is discharged from the discharge port 26 through the discharge chute 29 to the subsequent dewatering apparatus.
洗浄手段４０の水量調整部４４により、スクリーン本体２２の供給口２４側よりも排出口２６側の水量を少なくしているため、スクリーン本体２２の排出口２６側に噴射した洗浄水がスクリーン本体２２内に入って濃縮汚泥が希釈されることがない。このため、洗浄水による濃縮汚泥濃度の低下を防止して一定濃度の濃縮汚泥を排出することができる。 The amount of water on the discharge port 26 side of the screen body 22 is less than that on the supply port 24 side of the screen body 22 by the water amount adjustment unit 44 of the cleaning means 40, so the cleaning water sprayed to the discharge port 26 side of the screen body 22 is screen body 22. There is no dilution of the concentrated sludge. For this reason, the fall of the concentration sludge density | concentration by washing water can be prevented, and the concentration sludge of fixed density | concentration can be discharged | emitted.
図４は濃縮汚泥濃度と総洗浄水量比の関係を示すグラフである。同グラフの横軸は総洗浄水量比（−）を示し、縦軸は濃縮汚泥濃度（％）を示し、四角プロットは本発明、ひし形プロットは従来技術の均一洗浄を示している。
濃縮汚泥の理想的な濃度は５〜６％の範囲であるが、従来技術にくらべ本発明の方が総洗浄水量比に対する濃縮汚泥濃度が高く、理想的な濃度の濃縮汚泥が得られる。
FIG. 4 is a graph showing the relationship between the concentrated sludge concentration and the total washing water amount ratio. The horizontal axis of the graph represents the total washing water amount ratio (-), the vertical axis represents the concentrated sludge concentration (%), the square plot represents the present invention, and the rhombus plot represents the prior art uniform washing.
The ideal concentration of the concentrated sludge is in the range of 5 to 6%, but the concentration of the concentrated sludge with respect to the total washing water amount ratio is higher in the present invention than in the prior art, and a concentrated sludge having an ideal concentration can be obtained.
本発明の下水汚泥濃縮機は、洗浄手段の洗浄水量、汚泥の濃縮処理時間を低減できランニングコストを抑えることができる。したがって、下水汚泥を処理するときの装置として有用かつ有効なものとなる。よって産業上の利用可能性が高い。 The sewage sludge concentrator of the present invention can reduce the washing water amount of the cleaning means and the sludge concentration treatment time, and can suppress the running cost. Therefore, it becomes useful and effective as an apparatus for treating sewage sludge. Therefore, industrial applicability is high.
１０………下水汚泥濃縮機、２０………水切スクリーン、２２………スクリーン本体、２４………供給口、２６………排出口、２８………汚泥供給部、２９………排出シュート、３０………汚泥移送用スパイラル、４０………洗浄手段、４２………洗浄ノズル、４４………水量調整部。
10 ......... Sewage sludge concentrator, 20 ......... Draining screen, 22 ......... Screen body, 24 ......... Supply port, 26 ......... Discharge port, 28 ......... Sludge supply unit, 29 ......... Discharge Chute, 30... Sludge transfer spiral, 40... Cleaning means, 42... Cleaning nozzle, 44.
Claims (5)
前記水切スクリーンの上方で前記スクリーン本体の水平軸方向に沿って洗浄水を噴射する洗浄ノズルを有する洗浄手段を備え、
前記洗浄手段は、前記スクリーン本体の供給口側よりも排出口側の水量を少なくする水量調整部を設けたことを特徴とする下水汚泥濃縮機。 A draining screen that has a cylindrical screen body, rotates around a horizontal axis, supplies sludge from one supply port, and discharges concentrated sludge from the other discharge port;
A cleaning means having a cleaning nozzle for spraying cleaning water along the horizontal axis direction of the screen body above the draining screen;
The sewage sludge concentrator, wherein the cleaning means is provided with a water amount adjusting unit for reducing the amount of water on the discharge port side of the screen main body than on the supply port side.
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