JP4953098B2 - Screw press with agglomeration device - Google Patents
Screw press with agglomeration device Download PDFInfo
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- JP4953098B2 JP4953098B2 JP2008160558A JP2008160558A JP4953098B2 JP 4953098 B2 JP4953098 B2 JP 4953098B2 JP 2008160558 A JP2008160558 A JP 2008160558A JP 2008160558 A JP2008160558 A JP 2008160558A JP 4953098 B2 JP4953098 B2 JP 4953098B2
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- 230000002776 aggregation Effects 0.000 title claims description 40
- 238000005054 agglomeration Methods 0.000 title claims description 23
- 239000010802 sludge Substances 0.000 claims description 59
- 238000003756 stirring Methods 0.000 claims description 28
- 238000001914 filtration Methods 0.000 claims description 23
- 230000004931 aggregating effect Effects 0.000 claims description 20
- 230000002093 peripheral effect Effects 0.000 claims description 20
- 238000002347 injection Methods 0.000 claims description 19
- 239000007924 injection Substances 0.000 claims description 19
- 239000011550 stock solution Substances 0.000 claims description 18
- 239000000126 substance Substances 0.000 claims description 18
- 238000004220 aggregation Methods 0.000 claims description 17
- 230000015271 coagulation Effects 0.000 claims description 17
- 238000005345 coagulation Methods 0.000 claims description 17
- 230000001143 conditioned effect Effects 0.000 claims description 3
- 239000000243 solution Substances 0.000 claims description 3
- 239000000701 coagulant Substances 0.000 claims 1
- 230000018044 dehydration Effects 0.000 description 9
- 238000006297 dehydration reaction Methods 0.000 description 9
- 229920000642 polymer Polymers 0.000 description 8
- 238000005189 flocculation Methods 0.000 description 7
- 230000016615 flocculation Effects 0.000 description 7
- 230000015572 biosynthetic process Effects 0.000 description 6
- 238000013019 agitation Methods 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 238000012544 monitoring process Methods 0.000 description 4
- 238000011084 recovery Methods 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 3
- 244000144992 flock Species 0.000 description 3
- 230000003179 granulation Effects 0.000 description 3
- 238000005469 granulation Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 239000010800 human waste Substances 0.000 description 2
- -1 settlement drainage Substances 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- 239000010801 sewage sludge Substances 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- 238000004065 wastewater treatment Methods 0.000 description 2
- 230000003750 conditioning effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 239000000706 filtrate Substances 0.000 description 1
- 239000008394 flocculating agent Substances 0.000 description 1
- 230000003311 flocculating effect Effects 0.000 description 1
- 210000004907 gland Anatomy 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B9/00—Presses specially adapted for particular purposes
- B30B9/02—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material
- B30B9/12—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material using pressing worms or screws co-operating with a permeable casing
- B30B9/127—Feed means
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Treatment Of Sludge (AREA)
- Filtration Of Liquid (AREA)
Description
この発明は、下水、集落排水、し尿処理、工場廃水等の排水処理設備から発生する汚泥に、ポリマーを添加して圧搾脱水するスクリュープレスに関し、特に、スクリュープレスの前段に大きい凝集混和槽を設置することなく、スクリュープレスに円管状の凝集装置を連設したスクリュープレスの改良に関する。 The present invention relates to a screw press that adds a polymer to sludge generated from wastewater treatment facilities such as sewage, settlement drainage, human waste treatment, factory wastewater, etc. The present invention relates to an improvement of a screw press in which a circular agglomeration device is connected to the screw press.
従来、下水汚泥等を脱水するスクリュープレスはポリマーで凝集処理したものを脱水する必要があり、図6に示すように、凝集混和槽で汚泥と凝集剤を攪拌混合した凝集汚泥をスクリュープレスに供給している。混和槽を設置して、脱水に適した凝集フロックを造粒させて供給するスクリュープレスは、例えば、特許文献1に開示してある。また、スクリュー羽根を巻き掛けた回転軸を横型円筒状の本体内部に配設し、本体内部に溢流壁を立設して、汚泥供給管側を汚泥の調室部とし、調室部の回転軸に攪拌羽根を設けた汚泥処理装置も、例えば、特許文献2に開示してある。
従来の下水汚泥等をポリマーで凝集処理する混和槽は比較的大きいため、スクリュープレスの原液供給口側に大きな凝集混和槽の設置と監視のためのスペースが必要となる。大型の脱水機になると、凝集混和槽も所定の滞留時間を維持するために大きな槽になり、中心部と周辺部では攪拌機の周速度が異なるため、凝集フロックの生成状態にバラツキが生じていた。また、横型円筒状の本体内部に汚泥の調室部を設けた汚泥処理装置は、凝集混和槽の設置スペース、及び監視スペースが不要となるものであるが、調室部だけでの凝集フロックの造粒は、攪拌羽根の回転速度が遅いため、生成状態にバラツキを生じる。調室部をスクリュープレスに設置して圧搾脱水すると、凝集フロックがスクリーンから目抜けする恐れがある。 Since a conventional mixing tank for agglomerating sewage sludge and the like with a polymer is relatively large, a space for installing and monitoring a large agglomeration mixing tank is required on the stock solution supply port side of the screw press. When it became a large dehydrator, the agglomeration mixing tank also became a large tank to maintain a predetermined residence time, and the peripheral speed of the stirrer was different between the central part and the peripheral part. . In addition, the sludge treatment equipment provided with a sludge adjustment chamber inside the horizontal cylindrical body eliminates the need for a coagulation mixing tank installation space and a monitoring space. In the granulation, since the rotation speed of the stirring blade is slow, the generation state varies. When the conditioning chamber is installed in a screw press and is pressed and dehydrated, there is a possibility that the aggregated flocs may be missed from the screen.
この発明は、ラインミキサーの技術を応用してスクリュープレスに円管状の凝集装置を直接連設して、凝集フロックを生成させる凝集装置を有するスクリュープレスを提供する。 The present invention provides a screw press having an agglomeration device in which a flocculent floc is generated by directly connecting a circular agglomeration device to a screw press by applying the technology of a line mixer.
この発明に係る凝集装置を有するスクリュープレスは、外筒スクリーンとスクリュー軸でろ過室を形成し、スクリュー軸に内設した原液供給路からろ過室に調質汚泥を供給し、スクリュー軸に巻き掛けたスクリュー羽根で調質汚泥を移送しながら濃縮脱水し、排出口から脱水ケーキを取り出すスクリュープレスにおいて、スクリュー軸の始端部に連結してスクリュー軸とともに回転する供給管と、フロントフレームに支架した凝集管を連接して円筒状の凝集装置を構成し、凝集管の一端を供給管と摺接させ、他端の始端壁部に攪拌羽根を配置し、供給管の内周面に複数のバッフル板を止着し、攪拌羽根近傍の凝集管に原液汚泥の給泥管と凝集剤の薬注管を連結したことを特徴とする凝集装置を有するスクリュープレスである。 A screw press having a flocculation apparatus according to the present invention forms a filtration chamber with an outer cylinder screen and a screw shaft, supplies tempered sludge to the filtration chamber from a stock solution supply path installed in the screw shaft, and wraps around the screw shaft. In a screw press that removes dehydrated cake from the discharge port by transporting tempered sludge with a screw blade, the supply pipe connected to the start end of the screw shaft and rotating with the screw shaft, and agglomeration supported on the front frame The pipes are connected to form a cylindrical agglomeration device, one end of the agglomeration pipe is slidably contacted with the supply pipe, a stirring blade is disposed on the start end wall of the other end, and a plurality of baffle plates are provided on the inner peripheral surface of the supply pipe Is a screw press having a flocculating device, characterized in that a sludge supply pipe for raw sludge and a chemical injection pipe for a flocculating agent are connected to a flocculation pipe in the vicinity of a stirring blade .
この発明に係る凝集装置を有するスクリュープレスは、フロック形成後、直ちにスクリュープレスに供給して脱水を行なうため、フロックの破壊がなく水切り性が高くなり脱水性が向上する。スクリュープレスのろ過室に供給する調質汚泥処理量を確保できる。攪拌混合された旋回流をバッフル板で攪拌混合された旋回流をバッフル板に衝突させて乱流化し、フロック化を促進させると共に、低速化による造粒作用により適正なフロックにして、直線流に整流化させた調質汚泥をろ過室に供給できる。凝集フロックのバラツキがなく、均一なフロックの形成が可能となる。
スクリュー軸とともに回転する供給管により、同一軸芯で凝集汚泥をろ過室に供給できる。また、直径の小さい管内で攪拌するので攪拌ムラがなくなる。そして、攪拌混合された旋回流をバッフル板に衝突させて乱流化し、フロック化を促進させ、乱流をバッフル板で整流化できる。なお、凝集管に連結する薬注管の代わりに、給泥管に薬注管を連結しても良いもので、補機の設置スペースの少ないスクリュープレスに適するものである。
Since the screw press having the aggregating apparatus according to the present invention is supplied to the screw press immediately after the floc is formed to perform dehydration, the floc is not broken and the drainage performance is improved and the dewaterability is improved. The amount of tempered sludge supplied to the filtration chamber of the screw press can be secured. The swirl flow mixed with the baffle plate is turbulent by colliding the swirl flow mixed with the baffle plate to promote flocculation, and at the same time, it is made into an appropriate flock by the granulation action due to the low speed, so that it becomes a straight flow. Rectified tempered sludge can be supplied to the filtration chamber. There is no variation in aggregated flocs, and uniform flocs can be formed.
Aggregated sludge can be supplied to the filtration chamber with the same shaft core by the supply pipe rotating with the screw shaft. Moreover, since stirring is performed in a tube having a small diameter, uneven stirring is eliminated. Then, the swirling flow that has been stirred and mixed is made to collide with the baffle plate to be turbulent, promote flocking, and the turbulent flow can be rectified by the baffle plate. In addition, instead of the chemical injection pipe connected to the aggregation pipe, the chemical injection pipe may be connected to the mud supply pipe, which is suitable for a screw press with a small space for installing auxiliary equipment.
スクリュープレスに連設する凝集装置の他の発明は、凝集管の周壁の給泥管を取除き、汚泥流入口を拡開した凝集管を構成し、汚泥流入口にラインミキサーを接続したもので、二段凝集が可能となり、一段では凝集が難しい汚泥についても適用可能となり、汚泥の供給量を増やしても、凝集フロックのバラツキがなく、均一なフロックの形成が可能となる。二段凝集で攪拌力が強化され、大容量処理が可能となり、適用対象汚泥の拡大化とスクリュープレスの大型化が行える。 Another invention of the flocculation device connected to the screw press is that the sludge feed pipe on the peripheral wall of the flocculation pipe is removed, a sludge inlet is expanded, and a line mixer is connected to the sludge inlet. Further, two-stage flocculation is possible, and sludge that is difficult to flocculate in one stage can be applied. Even if the supply amount of sludge is increased, there is no variation in the flocculation flocs, and a uniform floc can be formed. Two-stage agglomeration enhances the stirring power, enables large-capacity treatment, and allows expansion of applicable sludge and enlargement of the screw press.
ラインミキサーの構成は、ラインミキサーの一端を凝集管と接続させ、他端の始端壁部に攪拌羽根と、汚泥流出口側の内周壁に複数のバッフル板を配設して、攪拌羽根近傍のラインミキサーに薬注管を接続した給泥管を連結したもので、ラインミキサーの薬注管と凝集装置の薬注管に二種類の高分子凝集剤、或は、無機凝集剤と高分子凝集剤等の別々の凝集剤を使用することで、均一な強固なフロックの形成が可能となり、より高範囲の汚泥に適用可能となる。凝集フロックのバラツキがなく、均一なフロックの形成が可能となり、調整時間が必要な難脱水汚泥等に適用できる。なお、給泥管に接続する薬注管を、ラインミキサーの周壁に連結しても良いものである。 The configuration of the line mixer is such that one end of the line mixer is connected to the agglomeration tube , a stirring blade is provided on the other end wall, and a plurality of baffle plates are provided on the inner peripheral wall on the sludge outlet side. A mud supply pipe with a chemical injection pipe connected to a line mixer is connected. Two types of polymer flocculant, or an inorganic flocculant and a polymer agglomeration, are used for the chemical injection pipe of the line mixer and the chemical injection pipe of the aggregator. By using a separate flocculant such as an agent, a uniform and strong floc can be formed, and can be applied to a higher range of sludge. There is no variation in aggregated flocs, it is possible to form uniform flocs, and it can be applied to hardly dewatered sludge and the like that require adjustment time. In addition, you may connect the chemical injection pipe connected to a mud pipe to the surrounding wall of a line mixer.
この発明は上記のように構成してあり、円管状の凝集装置をスクリュープレスの入口部に連設することによりスクリュー軸の軸芯と凝集装置の軸芯が共通となり、凝集装置の直径が小さくなる。スクリュープレスの原液供給側に大きい凝集混和槽を設置する必要がなく、凝集装置の設置スペースと、監視スペースが不要となる。ラインミキサーと凝集室を連設すれば、凝集汚泥の大容量処理が可能となり、スクリュープレスの大型化が行える。また、スクリュー軸とともに回転するバッフル板によりフロックの造粒を促進できる。 The present invention is configured as described above, and by connecting a tubular agglomeration device to the inlet portion of the screw press, the shaft core of the screw shaft and the agglomeration device become common, and the diameter of the agglomeration device is small. Become. It is not necessary to install a large coagulation mixing tank on the stock solution supply side of the screw press, and the installation space for the coagulation device and the monitoring space are not required. If a line mixer and a coagulation chamber are connected, a large volume of coagulated sludge can be processed, and the size of the screw press can be increased. In addition, flock granulation can be promoted by a baffle plate that rotates with the screw shaft.
この発明の実施例を図面に基づき詳述すると、先ず、図1は凝集装置を有するスクリュープレスの縦断面図であって、前後のフロントフレーム1及びリヤーフレーム2に支架されたスクリュープレス3は、周部にスクリーンを張設した外筒スクリーン4と、その内部にスクリュー羽根5を巻き掛けたスクリュー軸6を配設してある。スクリュー軸6は汚泥の供給側からケーキの排出側に向って拡大させてあり、外筒スクリーン4とスクリュー軸6の間に形成するろ過室7は、凝集汚泥が濃縮・脱水されるに従って容積を減少させてある。スクリュー軸6に原液供給路8が内接してあり、供給孔8aからろ過室7に調質汚泥を供給するようにしてある。 An embodiment of the present invention will be described in detail with reference to the drawings. First, FIG. 1 is a longitudinal sectional view of a screw press having an aggregating device, and a screw press 3 supported on front and rear front frames 1 and 2 is as follows. An outer cylinder screen 4 having a screen stretched around its periphery and a screw shaft 6 around which screw blades 5 are wound are disposed. The screw shaft 6 is enlarged from the sludge supply side to the cake discharge side, and the filtration chamber 7 formed between the outer cylinder screen 4 and the screw shaft 6 has a volume as the condensed sludge is concentrated and dewatered. It has been reduced. An undiluted solution supply path 8 is inscribed in the screw shaft 6, and conditioned sludge is supplied from the supply hole 8 a to the filtration chamber 7.
この発明の実施例では、円筒状の外筒スクリーン4が前半部の濃縮ゾーンAの外筒スクリーン4aと後半部のろ過・脱水ゾーンBの外筒スクリーン4bに分割してあり、濃縮ゾーンAの外筒スクリーン4aとろ過・脱水ゾーンBの外筒スクリーン4bの間に中間軸受9を介装し、ろ過・脱水ゾーンBの外筒スクリーン4bの下部を外筒支持ローラー10で支架してある。 In the embodiment of the present invention, the cylindrical outer cylinder screen 4 is divided into an outer cylinder screen 4a in the first half of the concentration zone A and an outer cylinder screen 4b in the second half of the filtration / dehydration zone B. An intermediate bearing 9 is interposed between the outer cylinder screen 4 a and the outer cylinder screen 4 b in the filtration / dehydration zone B, and the lower part of the outer cylinder screen 4 b in the filtration / dehydration zone B is supported by an outer cylinder support roller 10.
図2はスクリュープレスの原液供給側の要部拡大図であって、濃縮ゾーンAの外筒スクリーン4aの供給側に連結したフランジ11がフロントフレーム1に設けた回転板軸受12に軸支してある。このフランジ11にスプロケット13が嵌着してあり、フロントフレーム1の架台1aに載置した正逆転可能な濃縮外筒駆動機14に連動連結してある。 FIG. 2 is an enlarged view of a main part on the stock solution supply side of the screw press. A flange 11 connected to the supply side of the outer cylinder screen 4a in the concentration zone A is supported by a rotary plate bearing 12 provided on the front frame 1. is there. A sprocket 13 is fitted to the flange 11, and is interlocked and connected to a concentrating outer cylinder drive machine 14 that is placed on the mount 1 a of the front frame 1 and can be rotated forward and backward.
図3はスクリュープレスの脱水ケーキ排出側の要部拡大図であって、ろ過・脱水ゾーンBの外筒スクリーン4bの排出側に連結した回転板15がリヤーフレーム2に配設した回転板軸受16に軸支してあり、回転板15に嵌着したスプロケット17がリヤーフレーム2に載置した脱水機外筒駆動機18に連動連結してある。濃縮ゾーンAの外筒スクリーン4aとろ過・脱水ゾーンBの外筒スクリーン4bを差速回転可能としてある。外筒スクリーン4bに内設したスクリュー軸6の後端部にスクリュー駆動軸19が連結してあり、スクリュー駆動軸19はリヤーフレーム2の架台2aに設けた軸受20に軸支してある。このスクリュー駆動軸19にスプロケット21が嵌着してあり、スクリュー駆動機(図示せず)に連動連結してある。ろ過室7の後端側にプレッサー移動軸22に支架された背圧調整用のプレッサー23が配設してあり、プレッサー23はリヤーフレーム2に支架した移動用シリンダー24に連結してあり、ろ過室7のケーキの排出口25を調節可能としてある。 FIG. 3 is an enlarged view of the main part of the dewatering cake discharge side of the screw press, and a rotating plate bearing 16 in which a rotating plate 15 connected to the discharging side of the outer cylinder screen 4b in the filtration / dehydration zone B is disposed on the rear frame 2. A sprocket 17 fitted to the rotary plate 15 is linked to a dehydrator outer cylinder drive 18 mounted on the rear frame 2. The outer cylinder screen 4a in the concentration zone A and the outer cylinder screen 4b in the filtration / dehydration zone B can be rotated at a differential speed. A screw drive shaft 19 is connected to a rear end portion of the screw shaft 6 provided in the outer cylinder screen 4b, and the screw drive shaft 19 is supported by a bearing 20 provided on the frame 2a of the rear frame 2. A sprocket 21 is fitted on the screw drive shaft 19 and is linked to a screw drive machine (not shown). A back pressure adjusting presser 23 supported on a presser moving shaft 22 is disposed on the rear end side of the filtration chamber 7, and the presser 23 is connected to a moving cylinder 24 supported on the rear frame 2. The cake outlet 25 of the chamber 7 can be adjusted.
濃縮ゾーンAの外筒スクリーン4aとろ過・脱水ゾーンBの外筒スクリーン4bを差速回転させながらスクリュー軸6を回転させる。ろ過室7に供給された調質汚泥を、スクリュー羽根5で供給側からケーキの排出側に向って移送させ、外筒スクリーン4a、4bからろ液を分離してろ過室7の下方に配設したろ液トラフ26に排出する。調質汚泥は濃縮脱水されながらケーキ状となり、プレッサー23で背圧を受けながらケーキの排出口25からケーキ出口27に排出する。 The screw shaft 6 is rotated while the outer cylinder screen 4a in the concentration zone A and the outer cylinder screen 4b in the filtration / dehydration zone B are rotated at a differential speed. The tempered sludge supplied to the filtration chamber 7 is transferred from the supply side to the cake discharge side by the screw blade 5, and the filtrate is separated from the outer cylinder screens 4 a and 4 b and disposed below the filtration chamber 7. The filtered trough 26 is discharged. The tempered sludge becomes cake while being concentrated and dehydrated, and is discharged from the cake outlet 25 to the cake outlet 27 while receiving back pressure by the presser 23.
図2に示すように、スクリュー軸6の始端部に凝集汚泥の供給管28が連結してあり、供給管28を拡大させた外周部に軸受29を嵌着し、外筒4aに連結したフランジ11で軸支して、供給管28をスクリュー軸6とともに回転自在に軸支してある。供給管28の内周面に複数のバッフル板30・・・が放射状に止着してあり、供給管28をスクリュー軸6の原液供給路8からろ過室7に連通させて、バッフル板30をスクリュー軸6とともに回転させる。 As shown in FIG. 2, a flocculent sludge supply pipe 28 is connected to the starting end of the screw shaft 6, and a bearing 29 is fitted to the outer periphery of the enlarged supply pipe 28 and connected to the outer cylinder 4 a. 11, the supply pipe 28 is rotatably supported together with the screw shaft 6. A plurality of baffle plates 30... Are radially attached to the inner peripheral surface of the supply pipe 28, and the supply pipe 28 is communicated with the filtration chamber 7 from the stock solution supply path 8 of the screw shaft 6. It is rotated together with the screw shaft 6.
図4はスクリュープレスの原液供給側に接続する凝集装置の拡大図であって、スクリュー軸6の始端部に連結した供給管28が、フロントフレーム1に支架した凝集管31にグランドパッキン33を介して摺接させてある。凝集管31の始端壁部に攪拌羽根32が配設してあり、端壁に設けた軸受34に軸支され、端壁外周部の架台35に支架した攪拌駆動機36に直結してある。凝集管31の周壁に原液汚泥の給泥管37と凝集剤の薬注管38が連結してあり、給泥管37と薬注管38は、攪拌羽根32の先端部近傍に開口してある。なお、原液汚泥の給泥管37と凝集剤の薬注管38は、凝集管31の始端壁部に連結してもよいものである。スクリュー軸6に連結して回転する供給管28と供給管28に摺接させる凝集管31で、ラインミキサーを形成する円管状の凝集装置39を構成してある。凝集装置39をスクリュープレス3の入口部に連設することにより、スクリュー軸6の軸芯と凝集装置39の軸芯が共通となり、凝集フロックが破壊されることなく円滑にろ過室7に圧入できる。スクリュープレス3の原液供給側に大きい凝集混和槽を設置する必要がなく、従来の凝集装置の設置スペースと、監視スペースが不要となる。 FIG. 4 is an enlarged view of the aggregating apparatus connected to the stock solution supply side of the screw press. A supply pipe 28 connected to the starting end of the screw shaft 6 is connected to an aggregation pipe 31 supported on the front frame 1 via a gland packing 33. Are in sliding contact. An agitation blade 32 is disposed on the starting end wall portion of the aggregating tube 31, is pivotally supported by a bearing 34 provided on the end wall, and is directly connected to an agitation drive unit 36 supported on a gantry 35 on the outer peripheral portion of the end wall. A sludge supply mud pipe 37 and a flocculant chemical injection pipe 38 are connected to the peripheral wall of the aggregation pipe 31, and the mud supply pipe 37 and the chemical injection pipe 38 are opened near the tip of the stirring blade 32. . The raw sludge supply mud pipe 37 and the flocculant chemical injection pipe 38 may be connected to the start wall of the aggregation pipe 31. A circular agglomeration device 39 forming a line mixer is constituted by a supply pipe 28 connected to the screw shaft 6 and rotating and an agglomeration pipe 31 slidably in contact with the supply pipe 28. By connecting the aggregating device 39 to the inlet of the screw press 3, the axis of the screw shaft 6 and the axis of the aggregating device 39 become common, and the coagulation floc can be smoothly pressed into the filtration chamber 7 without being destroyed. . There is no need to install a large agglomeration mixing tank on the stock solution supply side of the screw press 3, and the installation space for the conventional aggregating apparatus and the monitoring space become unnecessary.
図4に示す攪拌羽根32の回転数は、原液濃度と凝集剤の種類により適宜変更するもので、1分間に200〜600rpmとしてあり、原液と凝集剤を攪拌羽根32の先端近傍に圧入し、攪拌羽根32で汚泥と凝集剤を急速攪拌する。攪拌羽根32で攪拌混合された旋回流をバッフル板30・・・に衝突させて乱流化して、フロック形成を促進させる。スクリュー軸6とともに回転する左右のバッフル板30、30によりフロックをさらに造粒する。フロックが形成された調質汚泥を供給管28から原液供給路8に流入させて、スクリュープレス3のろ過室7に供給する。直径の小さい管内で急速攪拌とバッフル板の組み合わせにより攪拌するので、攪拌ムラがなく、凝集フロックのバラツキがなりなり、均一なフロックの形成が可能となる。フロック形成後、直ちに脱水が行われ、フロックの破壊がなく水切れ性が高くなり、脱水性が向上する。凝集混和槽を配設したスクリュープレスと同等の調質汚泥の供給量の増加が可能となり、スクリュープレスの大型化による大容量処理が実施できる。なお、凝集管31の内周壁に止着した複数のバッフル板30・・・は、凝集管31の軸芯近傍まで延設しても良いもので、水流の乱流化の促進が図れる。薬注管38は凝集管31の周壁に連結せずに、薬注管38を給泥管37に接続し、給泥管37から原液と凝集剤の混合液を攪拌羽根32の先端近傍に圧入しても良いものである。 The number of rotations of the stirring blade 32 shown in FIG. 4 is appropriately changed according to the concentration of the stock solution and the type of the flocculant, and is 200 to 600 rpm per minute. The stock solution and the flocculant are pressed into the vicinity of the tip of the stirring blade 32, The sludge and the flocculant are rapidly stirred with the stirring blade 32. The swirl flow agitated and mixed by the agitation blades 32 collides with the baffle plates 30. The flocs are further granulated by the left and right baffle plates 30, 30 that rotate with the screw shaft 6. The tempered sludge in which the flocs are formed is caused to flow from the supply pipe 28 into the stock solution supply path 8 and supplied to the filtration chamber 7 of the screw press 3. Since stirring is performed by a combination of rapid stirring and a baffle plate in a pipe having a small diameter, there is no unevenness in stirring, and flocculent flocs vary, and uniform flocs can be formed. Immediately after the formation of the floc, dewatering is performed, the floc is not destroyed, the water drainage is increased, and the dewaterability is improved. It is possible to increase the supply amount of tempered sludge equivalent to a screw press provided with a coagulation mixing tank, and a large-capacity treatment can be performed by increasing the size of the screw press. The plurality of baffle plates 30 fixed to the inner peripheral wall of the aggregation tube 31 may be extended to the vicinity of the axial center of the aggregation tube 31, and the turbulence of the water flow can be promoted. The chemical injection pipe 38 is not connected to the peripheral wall of the aggregation pipe 31, but the chemical injection pipe 38 is connected to the mud supply pipe 37. You can do it.
図5は凝集装置を有するスクリュープレスの他の実施例であって、図4に示す凝集装置の汚泥流入口を拡開してラインミキサーに接続したものである。図4に示す凝集管31の周壁に連結した原液汚泥の給泥管37を取除き、汚泥流入口40aを拡開した構造の凝集管40を、スクリュー軸6の始端部に連結した供給管28に摺接させて、ラインミキサーを形成する凝集装置41を構成してある。凝集管40の汚泥流入口40aにラインミキサー42を接続してあり、ラインミキサー42の始端壁部に攪拌羽根43を端壁に設けた軸受44で軸支して、端壁外周部の架台45に支架した攪拌駆動機46に直結してある。凝集管40の汚泥流入口40a近傍のラインミキサー42の内周壁に複数のバッフル板47・・・を放射状に止着して、ラインミキサー42の周壁に凝集剤の薬注管48を接続した給泥管49が連結してある。凝集剤を混合した原液汚泥を攪拌羽根42の先端部近傍に圧入する。なお、薬注管48は給泥管49に接続する代わりに、ラインミキサー42の周壁に薬注管を連結しても良いものである。 FIG. 5 shows another embodiment of the screw press having the aggregating apparatus, in which the sludge inlet of the aggregating apparatus shown in FIG. 4 is expanded and connected to the line mixer. A supply pipe 28 in which the sludge supply pipe 37 of the raw sludge connected to the peripheral wall of the aggregation pipe 31 shown in FIG. 4 is removed, and the aggregation pipe 40 having a structure in which the sludge inlet 40 a is expanded is connected to the start end of the screw shaft 6. The aggregating apparatus 41 is configured to be brought into sliding contact with each other to form a line mixer. A line mixer 42 is connected to the sludge inlet 40a of the agglomeration tube 40, and a stirring blade 43 is pivotally supported by a bearing 44 provided on the end wall of the start end wall portion of the line mixer 42, so that a frame 45 on the outer peripheral portion of the end wall is supported. It is directly connected to the agitation drive unit 46 supported by A plurality of baffle plates 47... Are radially attached to the inner peripheral wall of the line mixer 42 in the vicinity of the sludge inlet 40 a of the aggregation pipe 40, and a flocculant drug injection pipe 48 is connected to the peripheral wall of the line mixer 42. A mud pipe 49 is connected. The raw solution sludge mixed with the flocculant is pressed into the vicinity of the tip of the stirring blade 42. Note that the chemical injection pipe 48 may be connected to the peripheral wall of the line mixer 42 instead of being connected to the mud supply pipe 49.
凝集装置41の前段に配設するラインミキサー42の攪拌羽根43の回転数も、原液濃度と凝集剤の種類により適宜変更するもので、1分間に200〜600rpmとしてあり、凝集剤を混合してラインミキサー42に圧入した原液を攪拌羽根43で急速攪拌し、バッフル板47・・・に衝突させ、フロック形成を促進させながら凝集管40の攪拌羽根32の先端近傍に圧入する。フロック形成中の凝集汚泥を攪拌羽根32で急速攪拌させて分断し、攪拌混合された旋回流をバッフル板30・・・に衝突させて乱流化して、再度フロック形成を促進させる。スクリュー軸6とともに回転する左右のバッフル板30、30に衝突させて強固なフロックを造粒させる。フロックが形成された調質汚泥を供給管28から原液供給路8に流入させて、スクリュープレス3のろ過室7に供給する。ラインミキサー42と凝集装置41を連設して二段凝集が行われ、凝集フロックを細分化して均一な強固なフロックの形成が可能となる。汚泥の供給量を増やしても、凝集フロックのバラツキがなく、調整時間が必要な難脱水汚泥等に適用できる。凝集汚泥の大容量処理が可能となりスクリュープレス3の大型化が行える。なお、ラインミキサー42の内周壁に止着した複数のバッフル板47・・・は、ラインミキサー42の軸芯近傍まで延設しても良いもので、フロック化が図れる。 The number of revolutions of the stirring blade 43 of the line mixer 42 disposed in the preceding stage of the aggregating device 41 is also appropriately changed depending on the concentration of the stock solution and the type of the aggregating agent, and is 200 to 600 rpm per minute. The stock solution press-fitted into the line mixer 42 is rapidly stirred by the stirring blade 43, collides with the baffle plates 47, and is pressed into the vicinity of the tip of the stirring blade 32 of the aggregation tube 40 while promoting floc formation. Aggregated sludge during floc formation is rapidly agitated by the agitating blade 32 and divided, and the swirl flow that has been agitated and mixed is made to collide with the baffle plates 30. Strong flocks are granulated by colliding with the left and right baffle plates 30, 30 rotating together with the screw shaft 6. The tempered sludge in which the flocs are formed is caused to flow from the supply pipe 28 into the stock solution supply path 8 and supplied to the filtration chamber 7 of the screw press 3. Two-stage aggregation is performed by connecting the line mixer 42 and the aggregating device 41, and the aggregated floc can be subdivided to form a uniform strong floc. Even if the supply amount of sludge is increased, it can be applied to difficult-to-dehydrate sludge and the like that do not vary in flocs and require adjustment time. Large capacity treatment of the coagulated sludge becomes possible, and the size of the screw press 3 can be increased. The plurality of baffle plates 47... Fixed to the inner peripheral wall of the line mixer 42 may be extended to the vicinity of the axis of the line mixer 42, and can be made flocked.
図6に示す従来タイプの凝集混和槽を使用したスクリュープレスと、図1に示すラインミキサー直結型スクリュープレスについて、K浄化センターの濃度1.8%の重力濃縮混合生汚泥に薬注率0.9%の高分子凝集剤を添加して、比較試験を行なった。外筒スクリーンを停止させ、スクリュー軸を回転数0.5min-1及び回転数1.0min-1で回転させて、ケーキ含水率(%W.B)、処理量(kg/h)、回収率(%)を測定した。比較試験の結果を表1に示す。試験結果は含水率と回収率はほぼ同等であったが、処理量は回転数0.5min-1及び回転数1.0min-1の時に、それぞれ1.13倍、1.10倍と、従来タイプの凝集混和槽を使用したスクリュープレスよりラインミキサー直結型スクリュープレスの方が多いという結果になった。 About the screw press using the conventional type coagulation mixing tank shown in FIG. 6 and the line mixer direct connection type screw press shown in FIG. A comparative test was performed with 9% polymer flocculant added. The outer cylinder screen is stopped, the screw shaft is rotated at a rotation speed of 0.5 min −1 and a rotation speed of 1.0 min −1 , the cake moisture content (% WB), the processing amount (kg / h), and the recovery rate (%) Was measured. Table 1 shows the results of the comparative test. The test results showed that the moisture content and the recovery rate were almost the same, but the treatment amount was 1.13 times and 1.10 times, respectively, when the rotational speed was 0.5 min −1 and the rotational speed was 1.0 min −1. The result was that the number of direct-type mixer-type screw presses was higher than that of screw presses using a type of coagulation mixing tank.
次に、M浄化センターの濃度4.1%の機械濃縮混合生汚泥に薬注率0.7%の高分子凝集剤を添加して、上記のスクリュープレスで比較試験を行なった。含水率(%W.B)、処理量(kg/h)、回収率(%)の比較試験の結果を表2に示す。試験結果は含水率と回収率はほぼ同等であったが、処理量は回転数0.5min-1及び回転数1.0min-1の時に、それぞれ1.16倍、1.24倍と、従来タイプの凝集混和槽を使用したスクリュープレスよりラインミキサー直結型スクリュープレスの方が多いという結果になった。 Next, a polymer flocculant having a chemical injection rate of 0.7% was added to mechanically concentrated mixed raw sludge having a concentration of 4.1% at the M purification center, and a comparative test was performed using the above screw press. Table 2 shows the results of a comparative test of water content (% WB), treatment amount (kg / h), and recovery rate (%). The test results showed that the moisture content and the recovery rate were almost the same, but the treatment amount was 1.16 times and 1.24 times, respectively, when the rotational speed was 0.5 min −1 and the rotational speed was 1.0 min −1. The result was that the number of direct-type mixer-type screw presses was higher than that of screw presses using a type of coagulation mixing tank.
表3は表1及び表2の比較試験をグラフに表したもので、縦軸に処理量kg/h、横軸にケーキ含水率%W.Bを表わしている。これらの結果を見ると、従来タイプの標準凝集混和槽を使用したスクリュープレスと比較して、ラインミキサー直結型スクリュープレスは同等以上の結果となっている。これは調質時のフロック形成が適正に行われ、フロック形成後直ちに濃縮脱水が行われることにより、フロックの破壊が起こらないためと考えられる。 Table 3 is a graph showing the comparative test of Table 1 and Table 2. The vertical axis represents the throughput kg / h, and the horizontal axis represents the cake water content% W. B is shown. When these results are seen, the line mixer direct connection type screw press has the same or better result as compared with the screw press using the conventional type standard coagulation mixing tank. This is considered to be because floc formation at the time of tempering is properly performed, and concentration and dehydration is performed immediately after the floc formation, so that the floc is not destroyed.
この発明の凝集装置を有するスクリュープレスは、ラインミキサーの技術を応用し、直径の小さい管内で急速攪拌とバッフル板の組み合わせにより攪拌混合するものである。即ち、原液供給路を内接するスクリュー軸に複数のバッフル板を止着した供給管を連結し、供給管に凝集管を摺接させて、凝集管の始端壁部に攪拌羽根と、周壁に原液汚泥の給泥管及び凝集剤の薬注管を連結して凝集装置を構成するもので、攪拌ムラがなく、均一なフロックの形成が可能となる。フロック形成後、直ちに脱水が行われ、フロックの破壊がなく水切れ性が高くなり、脱水性が向上する。凝集混和槽を配設したスクリュープレスと同等の調質汚泥の供給量の増加が可能となり、調整時間が必要な難脱水汚泥等に適用でき、スクリュープレスの大型化による大容量処理が実施できる。下水、集落排水、し尿処理、工場廃水等の排水処理設備から発生する汚泥に、ポリマーを添加して圧搾脱水する最適なスクリュープレスとなる。 The screw press having the agglomeration apparatus of the present invention applies the technology of a line mixer and stirs and mixes in a small diameter tube by a combination of rapid stirring and a baffle plate. That is, a supply pipe having a plurality of baffle plates fixed to a screw shaft inscribed in the stock solution supply path is connected, and the aggregation pipe is slidably contacted with the supply pipe. A sludge supply pipe and a flocculant chemical injection pipe are connected to constitute a coagulation apparatus, and there is no unevenness in stirring, and a uniform floc can be formed. Immediately after the formation of the floc, dewatering is performed, the floc is not destroyed, the water drainage is increased, and the dewaterability is improved. It is possible to increase the supply amount of tempered sludge equivalent to that of a screw press provided with a coagulation mixing tank, and it can be applied to difficult-to-dehydrate sludge that requires adjustment time, and a large-capacity treatment can be performed by increasing the size of the screw press. It becomes an optimal screw press that adds a polymer to the sludge generated from wastewater treatment facilities such as sewage, settlement drainage, human waste treatment, and factory wastewater, and presses and dehydrates.
4 外筒スクリーン
5 スクリュー羽根
6 スクリュー軸
7 ろ過室
8 原液供給路
25 排出口
28 供給管
30、47 バッフル板
31、40 凝集管
32、43 攪拌羽根
37、49 給泥管
38、48 薬注管
39 41 凝集装置
40a 汚泥流入口
42 ラインミキサー
4 Outer screen 5 Screw blade 6 Screw shaft 7 Filtration chamber 8 Stock solution supply path 25 Discharge port 28 Supply tube 30, 47 Baffle plate 31, 40 Aggregation tube 32, 43 Agitation blade 37, 49 Mud supply tube 38, 48 39 41 Coagulator 40a Sludge inlet 42 Line mixer
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JP2006055819A (en) * | 2004-08-24 | 2006-03-02 | Ishigaki Co Ltd | Method and apparatus for loading flocculent into filtration chamber in screw press |
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