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JP7561334B2 - Upflow type horizontal flow sedimentation tank - Google Patents

Upflow type horizontal flow sedimentation tank Download PDF

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JP7561334B2
JP7561334B2 JP2019062565A JP2019062565A JP7561334B2 JP 7561334 B2 JP7561334 B2 JP 7561334B2 JP 2019062565 A JP2019062565 A JP 2019062565A JP 2019062565 A JP2019062565 A JP 2019062565A JP 7561334 B2 JP7561334 B2 JP 7561334B2
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membrane
sedimentation tank
upflow type
raw water
sheet
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倫 波多野
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日本ソリッド株式会社
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Description

本発明は、汚濁物質を含有する原水を処理するための上向流式横流沈殿池に関する。 The present invention relates to an upflow type lateral flow sedimentation tank for treating raw water containing pollutants.

従来の上向流式横流沈殿池としては、傾斜板および/または傾斜管を設置した横流沈殿池において、該傾斜板または傾斜管の上手側に、隣接するシート膜間に間隔を設けたシート膜を設置した横流沈殿池が知られている(特許文献1)。 A conventional upward flow lateral flow sedimentation basin is known to have an inclined plate and/or inclined pipe, and has adjacent sheet membranes with gaps between them installed upstream of the inclined plate or pipe (Patent Document 1).

特開2013-132621号公報JP 2013-132621 A

特許文献1に開示された上向流式横流沈殿池は、沈殿池に流入する水流を整流化して短絡流の発生を防止すると共に、汚濁物質の沈降も同時に行うことができ、さらに傾斜板あるいは傾斜管の閉塞も防止することができていた。
本発明者は、かかる横流沈殿池をさらに除濁効果を高めかつ長期間連続して運転できる上向流式横流沈殿池について種々研究を重ねた結果、本発明の上向流式横流沈殿池を完成するに至った。
The upflow type lateral flow sedimentation tank disclosed in Patent Document 1 rectifies the water flow into the sedimentation tank to prevent the occurrence of short-circuiting, while simultaneously allowing pollutants to settle, and further prevents clogging of the inclined plate or pipe.
The inventors of the present invention have conducted extensive research into an upflow type lateral flow sedimentation basin which can further improve the turbidity removal effect and can be operated continuously for a long period of time, and as a result have completed the upflow type lateral flow sedimentation basin of the present invention.

すなわち、本発明は、傾斜板および/または傾斜管を設置した上向流式横流沈殿池において、傾斜板および/または傾斜管が設置された水面部に複数の溢流樋を設け、該溢流樋をラッシュ状膜体で囲繞してなる上向流式横流沈殿池である。 In other words, the present invention is an upward flow type lateral flow settling basin equipped with an inclined plate and/or an inclined pipe, in which a plurality of overflow troughs are provided on the water surface where the inclined plate and/or the inclined pipe are installed, and the overflow troughs are surrounded by a rush-like membrane body.

本発明の上向流式横流沈殿池によれば、原水の処理量を増大させることができると共に、原水中の汚濁物質の除去率を高めることができ、さらに長期間連続的に運転することができる。 The upflow cross-flow sedimentation tank of the present invention can increase the amount of raw water that can be treated, improve the removal rate of pollutants in the raw water, and can be operated continuously for a long period of time.

本発明の上向流式横流沈殿池の側面図。FIG. 2 is a side view of the upflow type lateral flow sedimentation tank of the present invention. 図1の上向流式横流沈殿池の平面図。FIG. 2 is a plan view of the upflow type cross-flow sedimentation tank of FIG. 1 . 連接されたシート膜の正面図。FIG. 2 is a front view of a connected sheet membrane. 連接されたシート膜の側面図。FIG. 2 is a side view of an articulated sheet membrane. 連接されたシート膜の正面図。FIG. 2 is a front view of a connected sheet membrane. 傾斜板および/または傾斜管が設置された沈殿槽の側面図。FIG. 2 is a side view of a settling tank with an inclined plate and/or inclined tube installed. ラッシュ状膜体が設置された溢流樋の側面図。A side view of an overflow gutter with a rush membrane installed. 傾斜板および/または傾斜管が設置された沈殿槽の平面図。FIG. 2 is a plan view of a settling tank with an inclined plate and/or inclined tube installed.

次に本発明の上向流式横流沈殿池について説明するが、本発明は以下の説明のみに限定されるものではない。
図1は、本発明の上向流式横流沈殿池の一態様を示す側断面を表す概略図であり、図2はその平面図である。
Next, the upflow type lateral flow sedimentation basin of the present invention will be described, however, the present invention is not limited to the following description.
FIG. 1 is a schematic diagram showing a side cross-section of one embodiment of an upflow type lateral flow sedimentation basin of the present invention, and FIG. 2 is a plan view thereof.

1は原水流入部、2は急速攪拌槽、3は緩速攪拌槽、4はシート膜を展張した整流沈殿槽、5は傾斜板および/または傾斜管を設置した沈殿槽、6は溢流樋、7は凝集剤供給管、8は汚濁物質を含有する原水供給管、9は連結されたシート膜、10はシート状膜、11はフロート、12は隣接するシート膜10との間の間隔、13は沈殿池の底部に沈積したスラッジ、14はスラッジ集水管、15はシート状膜10の両端を示す。 1 indicates the raw water inlet, 2 indicates the rapid mixing tank, 3 indicates the slow mixing tank, 4 indicates the straightening sedimentation tank with a sheet membrane stretched out, 5 indicates the sedimentation tank with an inclined plate and/or inclined pipe, 6 indicates the overflow trough, 7 indicates the coagulant supply pipe, 8 indicates the raw water supply pipe containing pollutants, 9 indicates the connected sheet membranes, 10 indicates the sheet membrane, 11 indicates the float, 12 indicates the gap between adjacent sheet membranes 10, 13 indicates the sludge deposited at the bottom of the sedimentation tank, 14 indicates the sludge collection pipe, and 15 indicate both ends of the sheet membrane 10.

河川等から取水した汚濁物質を含有する原水を、上向流式横流沈殿池の原水流入部1に導入し、同時に凝集剤供給管7より凝集剤溶液を導入する。この凝集剤溶液は、凝集溶液の外、凝集剤と本発明の沈殿槽のスラッジ集水管14から集水したスラッジ水で調整した溶液も使用することができる。 Raw water containing pollutants taken from a river or the like is introduced into the raw water inlet 1 of the upflow cross-flow settling tank, and at the same time, a flocculant solution is introduced from the flocculant supply pipe 7. In addition to the flocculant solution, this flocculant solution can also be a solution prepared from a flocculant and sludge water collected from the sludge collection pipe 14 of the settling tank of the present invention.

原水導入部1で汚濁物質を含有する原水(以下「原水」という)と供給された凝集剤溶液とが混合され、急速攪拌槽2に導入され、ここで急速攪拌が行われ、さらに均一に混合される。急速攪拌槽2で混合された原水は、次に緩速攪拌槽3に導入され、緩速攪拌が行われ原水中の汚濁物質がフロック化される。緩速攪拌槽3で処理された原水は、次の連結されたシート膜9を水流に対して対向して複数条展張した整流沈殿槽4に導入される。図3は連結されたシート膜9の正面図であり、図4は該連結されたシート膜9の側面図である。この整流沈殿槽4に展張されるシート膜9は、図3に示すようにシート膜10の上部にフロート11を設け、このフロート11を連結することによって構成することができる。この際隣結するシート膜10との間に間隔12を設けることが必要である。この間隔幅は、水流の速度にもよるが、一般的には5~10cmの間隔を設けることが好ましい。また連結されたシート膜9の前後の間隔は1.2~6mの間隔で設けることが好ましい。 In the raw water inlet 1, raw water containing pollutants (hereinafter referred to as "raw water") is mixed with the supplied coagulant solution, and then introduced into the rapid mixing tank 2, where rapid mixing is performed and further mixed uniformly. The raw water mixed in the rapid mixing tank 2 is then introduced into the slow mixing tank 3, where slow mixing is performed to flocculate the pollutants in the raw water. The raw water treated in the slow mixing tank 3 is then introduced into the rectifying sedimentation tank 4, in which multiple connected sheet membranes 9 are spread out against the water flow. Figure 3 is a front view of the connected sheet membranes 9, and Figure 4 is a side view of the connected sheet membranes 9. The sheet membrane 9 spread out in this rectifying sedimentation tank 4 can be constructed by providing a float 11 on the top of the sheet membrane 10 as shown in Figure 3 and connecting the floats 11. In this case, it is necessary to provide a gap 12 between adjacent sheet membranes 10. The width of this gap depends on the speed of the water flow, but it is generally preferable to provide a gap of 5 to 10 cm. It is also preferable to set the distance between the front and rear of the connected sheet membranes 9 at 1.2 to 6 m.

またこのシート膜10には、さらに整流効果を高めるために、整流孔を設けることもできる。そしてこの整流孔の総面積は、シート膜10の面積の6%程度が好適である。また整流孔の径は10cm程度が好適である。
さらにシート状膜10に整流効果を高める他の方法としては、図5に示すようにシート状膜10の両端15を凹凸・非線形の波型にすることもできる。この波型の総面積はシート状膜状10の面積の6%程度が好適である。そして前記シート状膜10は、通常複数条展張することが好ましい。
To further enhance the straightening effect, straightening holes can be provided in the sheet membrane 10. The total area of the straightening holes is preferably about 6% of the area of the sheet membrane 10. The diameter of the straightening holes is preferably about 10 cm.
As another method for enhancing the rectifying effect of the sheet-like membrane 10, both ends 15 of the sheet-like membrane 10 can be corrugated nonlinearly as shown in Fig. 5. The total area of the corrugations is preferably about 6% of the area of the sheet-like membrane 10. It is usually preferable that the sheet-like membrane 10 is stretched in multiple stripes.

整流沈殿槽4を通過する原水はシート状膜10間の間隔12を通過することによって、またシート状膜10の整流孔(図示せず)を通過する時に整流化されると共に、フロック化された汚濁物質を沈降させる。
整流沈殿槽4を通過した原水は、次に傾斜板および/または傾斜管を設置した沈殿槽5に導入される。
The raw water passing through the rectification settling tank 4 is rectified by passing through the gaps 12 between the sheet membranes 10 and through the rectification holes (not shown) of the sheet membranes 10, and causes flocculated pollutants to settle.
The raw water that has passed through the rectifying sedimentation tank 4 is then introduced into a sedimentation tank 5 equipped with an inclined plate and/or an inclined pipe.

この沈殿槽5には、傾斜板および/または傾斜管の上部の水面部に溢流樋6を設け、該溢流樋6を囲繞するようにラッシュ状膜体16を設ける。
ラッシュ状膜体16としては図6に示すように傾斜板および/または傾斜管17の上部水面部に設けられた溢流樋6を囲繞するようにラッシュ状膜体16を設ける。
ラッシュ状膜体16は例えば図7に示すようにラッシュ状膜体16の両端にフロート18を設け溢流樋6を囲繞するように設置すればよい。
図8は図6の平面図である。
In this settling tank 5, an overflow gutter 6 is provided on the water surface above the inclined plate and/or pipe, and a rush-like membrane 16 is provided so as to surround the overflow gutter 6.
As shown in FIG. 6, the rush-like membrane 16 is provided so as to surround the overflow gutter 6 provided on the upper water surface portion of the inclined plate and/or pipe 17.
The rush-like membrane 16 may be installed, for example, as shown in FIG. 7, with floats 18 provided on both ends of the rush-like membrane 16 so as to surround the overflow gutter 6.
FIG. 8 is a plan view of FIG.

沈殿槽5に導入された原水は、ここで汚濁物質をフロック化させ、フロック化した汚濁物質を分離し、スラッジとして沈殿池5の底部に沈降堆積させる。
傾斜板および/または傾斜管17を通過した原水(処理水)は、さらにラッシュ状膜体16によって汚濁物質が除去され、清澄化した状態で溢流樋6から横流沈殿池外に排出される。
The raw water introduced into the settling tank 5 undergoes flocculation of polluted substances, and the flocculated polluted substances are separated and allowed to settle and accumulate at the bottom of the settling tank 5 as sludge.
The raw water (treated water) that has passed through the inclined plate and/or inclined pipe 17 is further passed through the rush membrane 16 to remove contaminants, and is discharged in a clarified state from the overflow duct 6 to the outside of the lateral flow settling basin.

ラッシュ状膜体16は結節網,無結節網,成形網等の合成または天然繊維から調されたネット体、合成または天然繊維の細い紐状ものをリング状にして織り込んだ素材が用いられる。 The rush-like membrane 16 may be a net made of synthetic or natural fibers, such as knotted net, knotless net, or molded net, or a material made by weaving thin strings of synthetic or natural fibers into rings.

本発明の上向流式横流沈殿池と、ラッシュ状膜体16を有しない横流沈殿池を用いて原水(濁度358mg/L)の処理を行ったところ、本発明に係る上向流式横流沈殿池の溢流樋6部における濁度は0.5mg/Lであり、1ヶ月間連続運転することができた。一方ラッシュ状膜体16の設置していない上向流式横流沈殿池にあっては集水トラフ部における濁度は3であり、0.1ヶ月後には濁度が上昇し運転が不可能になったため、ろ過器の洗浄をおこなった。 When raw water (turbidity 358 mg/L) was treated using the upflow type cross-flow settling tank of the present invention and a cross-flow settling tank without the rush-like membrane 16, the turbidity in the overflow trough 6 of the upflow type cross-flow settling tank of the present invention was 0.5 mg/L, and continuous operation was possible for one month. On the other hand, in the upflow type cross-flow settling tank without the rush-like membrane 16, the turbidity in the collection trough was 3, and after 0.1 month the turbidity had risen to the point where operation was impossible, so the filter was cleaned.

6・・・溢流樋
16・・・ラッシュ状膜体
6... Overflow gutter 16... Rush-like membrane body

Claims (1)

傾斜板および/または傾斜管を設置した上向流式横流沈殿池において、傾斜板および/または傾斜管が設置された水面部に複数の溢流樋を設け、該溢流樋をラッシュ状膜体で囲繞することを特徴とする上向流式横流沈殿池。
An upward flow type lateral flow sedimentation basin equipped with an inclined plate and/or an inclined pipe, characterized in that a plurality of overflow troughs are provided on the water surface where the inclined plate and/or the inclined pipe are installed, and the overflow troughs are surrounded by a rush-like membrane body.
JP2019062565A 2019-03-28 2019-03-28 Upflow type horizontal flow sedimentation tank Active JP7561334B2 (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001187303A (en) 2000-01-05 2001-07-10 Yoshiji Sakamoto Solid-liquid separator in wastewater treatment equipment
JP5479580B2 (en) 2009-06-18 2014-04-23 ゼットティーイー コーポレーション Method and apparatus for parallel TURBO decoding in LTE
JP6013205B2 (en) 2013-01-18 2016-10-25 メタウォーター株式会社 Concentrator

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5990908B2 (en) * 2011-12-27 2016-09-14 日本ソリッド株式会社 Cross-flow sedimentation basin
JP6981590B2 (en) * 2015-10-13 2021-12-15 日本ソリッド株式会社 Sedimentation separator
JP6752113B2 (en) * 2016-11-04 2020-09-09 オルガノ株式会社 Operation method of sludge blanket type coagulation sedimentation device and sludge blanket type coagulation sedimentation device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001187303A (en) 2000-01-05 2001-07-10 Yoshiji Sakamoto Solid-liquid separator in wastewater treatment equipment
JP5479580B2 (en) 2009-06-18 2014-04-23 ゼットティーイー コーポレーション Method and apparatus for parallel TURBO decoding in LTE
JP6013205B2 (en) 2013-01-18 2016-10-25 メタウォーター株式会社 Concentrator

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