JP2007061759A - Sand-separating cleaning apparatus - Google Patents

Sand-separating cleaning apparatus Download PDF

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JP2007061759A
JP2007061759A JP2005253045A JP2005253045A JP2007061759A JP 2007061759 A JP2007061759 A JP 2007061759A JP 2005253045 A JP2005253045 A JP 2005253045A JP 2005253045 A JP2005253045 A JP 2005253045A JP 2007061759 A JP2007061759 A JP 2007061759A
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sand
bottom wall
water
solid
liquid separation
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JP4741322B2 (en
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Taisuke Nakano
泰典 中野
Terukazu Araoka
輝一 新阜
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Hitachi Plant Technologies Ltd
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Hitachi Plant Technologies Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a sand-separating cleaning apparatus which can remove odor of muddy sand drawn from e.g. a sand precipitation pond and also enables a high-degree removal of impurities contained in the sand. <P>SOLUTION: The apparatus has a solid-liquid separation vessel 1 to be introduced with muddy sand mixed water and a precipitation vessel 2 arranged below the separation vessel 1. The separation vessel 1 has a cylindrical tube wall 3 which generates a swirl flowing down along the peripheral wall of the tube wall 3 by allowing the muddy sand mixed water to flow in tangentially, a bottom wall 4 consisting of an upside-down head-cut conical sieve arranged in the bottom part of the tube wall 3 and a drain duct 5 draining water around the center of the bottom wall 4 out of the vessel 1, and a non-porous section 42 without sieve mesh is disposed on the outer periphery of the bottom wall 4. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、砂分離洗浄装置に関し、特に、沈砂池等から揚砂された汚砂の臭気を除去するとともに砂中に含まれる夾雑物を高度に除去することを可能とした砂分離洗浄装置に関するものである。   The present invention relates to a sand separation and cleaning device, and more particularly, to a sand separation and cleaning device capable of removing odor of dirty sand pumped from a sand basin and the like and highly removing impurities contained in the sand. Is.

従来、下水処理場や浄水場等の沈砂池からポンプを用いて揚砂された沈砂は、比重差分離、遠心分離等を用いた固液分離装置により固液分離され、砂分のみを回収するようにしている。   Conventionally, sand that has been pumped from a sand basin such as a sewage treatment plant or water purification plant using a pump is solid-liquid separated by a solid-liquid separation device using specific gravity difference separation, centrifugation, etc., and only the sand content is collected. I am doing so.

ところで、近年、廃棄物に関する規制が厳しくなり、夾雑物が含まれている沈砂は、産業廃棄物として取り扱われ、その処分コストが膨大となり問題となっている。
一方、沈砂を一般廃棄物として処分(又は再利用)するためには、熱灼減量が10%以下であることに加え、沈砂に含まれる夾雑物を確実に分離除去する必要がある。
By the way, in recent years, regulations regarding wastes have become stricter, and sedimentation sand containing foreign matters is handled as industrial waste, and its disposal cost has become enormous.
On the other hand, in order to dispose (or reuse) the sand sediment as general waste, it is necessary to reliably separate and remove impurities contained in the sand sediment in addition to the heat loss being 10% or less.

しかしながら、沈砂の回収率と夾雑物の除去率は、トレードオフの関係にあり、固液分離装置で夾雑物の除去率を改善しようとすると、沈砂の回収率が著しく悪化し、沈砂池内に貯留された沈砂を回収するための機器の運転時間が長くなり、ランニングコストが上昇するという問題があった。   However, there is a trade-off between the collection rate of sedimentation and the removal rate of contaminants. If an attempt is made to improve the removal rate of contaminants using a solid-liquid separator, the recovery rate of sedimentation will be significantly deteriorated and stored in the sedimentation basin. There is a problem that the operation time of the equipment for collecting the settling sand becomes longer and the running cost increases.

本発明は、上記従来の沈砂の処理に関する問題点に鑑み、沈砂池等から揚砂された汚砂の臭気を除去するとともに砂中に含まれる夾雑物を高度に除去することを可能とした砂分離洗浄装置を提供することを目的とする。   The present invention, in view of the above-described problems related to the treatment of settling sand, removes the odor of the sand that has been pumped from a settling basin and the like, and at the same time, removes impurities contained in the sand at a high level. An object is to provide a separation and cleaning apparatus.

上記目的を達成するため、本第1発明の砂分離洗浄装置は、汚砂混合水が導入される固液分離槽と、該固液分離槽の下に設置される沈降槽とを備えた砂分離洗浄装置において、前記固液分離槽が、接線方向に汚砂混合水を流入させることにより周壁に沿い下降する旋回流を発生させる円筒状の筒壁と、該筒壁の底部に配設された逆さ裁頭円錐状の篩からなる底壁と、該底壁の中心付近の水を外部に排出する排水ダクトとを備えるとともに、前記底壁の外周部に篩目のない無孔部を設けたことを特徴とする。   In order to achieve the above object, a sand separation and washing apparatus according to the first aspect of the present invention is a sand equipped with a solid / liquid separation tank into which sewage mixed water is introduced and a sedimentation tank installed under the solid / liquid separation tank. In the separation and washing apparatus, the solid-liquid separation tank is disposed at a cylindrical tubular wall that generates a swirling flow that descends along the peripheral wall by flowing the sewage mixed water in a tangential direction, and a bottom portion of the cylindrical wall. And a drainage duct for discharging water near the center of the bottom wall to the outside, and a non-porous portion without a sieve is provided on the outer periphery of the bottom wall. It is characterized by that.

この場合において、底壁の開口部に下方から気泡を供給し、底壁の中心付近に乱流を発生させるエア供給装置を設けることができる。   In this case, it is possible to provide an air supply device that supplies bubbles to the opening of the bottom wall from below and generates turbulence near the center of the bottom wall.

また、エア供給装置が、底壁の裏面に下方から気泡を供給することができる。   Further, the air supply device can supply bubbles from below to the back surface of the bottom wall.

また、篩目を通して上方に水を噴射する噴射ノズルを底壁の下に設けることができる。   Moreover, the injection nozzle which injects water upwards through a sieve mesh can be provided under a bottom wall.

一方、同じ目的を達成するため、本第2発明の砂分離洗浄装置は、汚砂混合水が導入される固液分離槽と、該固液分離槽の下に設置される沈降槽とを備えた砂分離洗浄装置において、前記固液分離槽が、接線方向に汚砂混合水を流入させることにより周壁に沿い下降する旋回流を発生させる円筒状の筒壁と、該筒壁の底部に配設された逆さ裁頭円錐状の篩からなる底壁と、該底壁の開口部と固液分離槽の上部とを接続する循環ダクトと、該循環ダクトの一部に接続されたエジェクタとを備えるとともに、前記底壁の外周部に篩目のない無孔部を設けたことを特徴とする。   On the other hand, in order to achieve the same object, the sand separation and washing apparatus of the second invention includes a solid / liquid separation tank into which the sewage mixed water is introduced, and a sedimentation tank installed under the solid / liquid separation tank. In the sand separation and washing apparatus, the solid-liquid separation tank is disposed at a cylindrical cylindrical wall that generates a swirling flow that descends along the peripheral wall by flowing the sewage mixed water in a tangential direction, and a bottom of the cylindrical wall. A bottom wall made of an inverted frustoconical sieve, a circulation duct connecting the opening of the bottom wall and the upper part of the solid-liquid separation tank, and an ejector connected to a part of the circulation duct And a non-porous portion without a sieve is provided on the outer peripheral portion of the bottom wall.

この場合において、前記底壁を上下動可能に弾支することができる。   In this case, the bottom wall can be elastically supported so as to move up and down.

また、前記沈降槽に給水する給水装置を設けることができる。   Moreover, the water supply apparatus which supplies water to the said sedimentation tank can be provided.

また、前記底壁の篩目を上部が細いテーパ状に形成することができる。   Further, the screen of the bottom wall can be formed in a tapered shape with a thin upper part.

本第1発明の砂分離洗浄装置によれば、汚砂混合水が導入される固液分離槽と、該固液分離槽の下に設置される沈降槽とを備えた砂分離洗浄装置において、前記固液分離槽が、接線方向に汚砂混合水を流入させることにより周壁に沿い下降する旋回流を発生させる円筒状の筒壁と、該筒壁の底部に配設された逆さ裁頭円錐状の篩からなる底壁と、該底壁の中心付近の水を外部に排出する排水ダクトとを備えることから、旋回流による遠心力で汚砂とごみとを分散し比重差分離するとともに、底壁の篩により砂と砂利とを粒径分離し、これにより、底壁の中心付近に比重差の大きいごみと砂利とを集め、比重の大きい砂利は底壁中心から沈降槽に落下させて砂と共に回収する一方、比重の小さいごみを効率よく選択的に排水ダクトにより水と共に排出することができる。
すなわち、従来では、砂とごみ、砂利が混在した状態で比重差分離をしていることから、砂の流出を抑えるために、排水ダクトの吸込流速を大きくすることができなかったが、本発明では、比重が大きく異なる砂利とごみを比重差分離するため、従来に比べて吸込流速を大きくすることが可能となり、ごみの除去効率を高めることができる。
また、排水ダクトの強い吸込流で沈降槽内の水を吸い込むことにより、底壁の篩通過流量を増やすことができ、これにより、篩効果を高めることができる。
一方、底壁の外周部は、汚砂混合水の旋回力が強いため、し渣が付着し易く、また、それが成長する恐れがあるが、底壁の外周部に篩目のない無孔部を設けることにより、底壁へのし渣の付着を防止することができる。
なお、底壁の外周付近は旋回力が強く、沈砂が沈降しないので、篩目のない無孔部を設けても処理能力には影響しない。
According to the sand separation and washing apparatus of the first invention, in the sand separation and washing apparatus provided with a solid-liquid separation tank into which dirty sand mixed water is introduced, and a sedimentation tank installed under the solid-liquid separation tank, The solid-liquid separation tank has a cylindrical cylindrical wall that generates a swirling flow that descends along the peripheral wall by flowing sewage mixed water in a tangential direction, and an inverted truncated cone disposed at the bottom of the cylindrical wall A bottom wall made of a sieving sieve and a drainage duct that discharges water near the center of the bottom wall to the outside. Sand and gravel are separated by particle size using a sieve on the bottom wall, thereby collecting dust and gravel with a large specific gravity difference near the center of the bottom wall, and gravel with a large specific gravity is dropped from the center of the bottom wall into the sedimentation tank. While collecting with sand, waste with low specific gravity is efficiently and selectively shared with water by the drainage duct. It can be discharged.
That is, conventionally, since the specific gravity difference separation is performed in a state where sand, dust, and gravel are mixed, the suction flow velocity of the drainage duct cannot be increased in order to suppress the outflow of sand. Then, since gravel and waste having different specific gravities are separated by specific gravity difference, the suction flow velocity can be increased as compared with the conventional case, and the removal efficiency of dust can be increased.
Moreover, by sucking the water in the sedimentation tank with a strong suction flow of the drainage duct, the flow rate of the sieve wall passing through the bottom wall can be increased, thereby enhancing the sieving effect.
On the other hand, the outer peripheral part of the bottom wall has a strong swirling force of the sewage-mixed water, so that residue is likely to adhere to it and it may grow. By providing the portion, adhesion of residue to the bottom wall can be prevented.
In addition, since the turning force is strong near the outer periphery of the bottom wall and the settling sand does not settle, even if a nonporous portion without a sieve is provided, the processing capacity is not affected.

この場合、底壁の開口部に下方から気泡を供給し、底壁の中心付近に乱流を発生させるエア供給装置を設けることにより、旋回流によって縦向きの姿勢で集められる薄板状のごみを、乱流によって排水ダクトに吸い込まれやすい姿勢にすることができ、これにより、沈降し易い薄板状のごみを排水ダクトで吸い込んで排出することができる。   In this case, by supplying air bubbles from the bottom to the opening of the bottom wall and providing an air supply device that generates turbulent flow near the center of the bottom wall, thin-plate-like garbage collected in a vertical orientation by swirling flow is removed. Therefore, the turbulent flow can make it easy to be sucked into the drainage duct, so that the thin plate-like dust that tends to settle can be sucked into the drainage duct and discharged.

また、エア供給装置が、底壁の裏面に下方から気泡を供給することにより、逆洗時に、底壁の篩に付着したごみをエアブロー効果により浮上させることができる。   In addition, the air supply device supplies air bubbles from below to the back surface of the bottom wall, so that dust attached to the bottom wall screen can be floated by the air blow effect during backwashing.

また、篩目を通して上方に水を噴射する噴射ノズルを底壁の下に設けることにより、万が一排水ダクトが閉塞しても、逆洗水投入に合わせて噴射することにより、底壁と排水ダクトの間で汚砂がブリッジすることを防止し、処理を継続することができる。   In addition, by providing an injection nozzle under the bottom wall for injecting water upward through the sieve mesh, even if the drainage duct is blocked, by injecting it according to the backwash water injection, the bottom wall and the drainage duct It is possible to prevent the sand from bridging between them and continue the treatment.

また、本第2発明の砂分離洗浄装置によれば、汚砂混合水が導入される固液分離槽と、該固液分離槽の下に設置される沈降槽とを備えた砂分離洗浄装置において、前記固液分離槽が、接線方向に汚砂混合水を流入させることにより周壁に沿い下降する旋回流を発生させる円筒状の筒壁と、該筒壁の底部に配設された逆さ裁頭円錐状の篩からなる底壁と、該底壁の開口部と固液分離槽の上部とを接続する循環ダクトと、該循環ダクトの一部に接続されたエジェクタとを備えることから、旋回流による遠心力で汚砂とごみとを分散し比重差分離するとともに、底壁の篩により砂と砂利とを粒径分離して、底壁の中心付近に比重差の大きいごみと砂利を集め、エジェクタ及び循環ダクトにより一定時間毎に溜まったごみと砂利を固液分離槽内を再循環させ、運転完了後に残ったごみや砂利を槽外に引き抜くことにより、砂利と共に沈降する可能性のあるレキ片やガラス片と区別し、砂のみを回収することができる。
このとき、処分上、砂利とごみは分離する必要があるため、砂利ごみ分離機が必要となるが、砂利ごみ分離機は従来製品の上向流式分級機等を用いることができる。
一方、底壁の外周部は、汚砂混合水の旋回力が強いため、し渣が付着し易く、また、それが成長する恐れがあるが、底壁の外周部に篩目のない無孔部を設けることにより、し渣の付着を防止することができる。
なお、底壁の外周付近は旋回力が強く、沈砂が沈降しないので、篩目のない無孔部を設けても処理能力には影響しない。
Moreover, according to the sand separation and washing apparatus of the second invention, the sand separation and washing apparatus provided with a solid-liquid separation tank into which sewage mixed water is introduced and a sedimentation tank installed under the solid-liquid separation tank. The solid-liquid separation tank has a cylindrical cylindrical wall that generates a swirling flow that descends along the peripheral wall by flowing the sewage mixed water in a tangential direction, and an upside-down cutting disposed at the bottom of the cylindrical wall. Since it comprises a bottom wall made of a cone-shaped sieve, a circulation duct connecting the opening of the bottom wall and the upper part of the solid-liquid separation tank, and an ejector connected to a part of the circulation duct, The centrifugal force generated by the flow disperses the waste sand and dust and separates the specific gravity difference, and the sand and gravel are separated by the particle size by the bottom wall sieve to collect the dust and gravel with a large specific gravity near the center of the bottom wall. The waste and gravel collected at regular intervals by the ejector and circulation duct are recirculated in the solid-liquid separation tank. Is allowed, by pulling the remaining dirt and gravel after the operation completes outside the tank, distinguished from the gravel pieces or glass pieces which may be precipitated with gravel, it is possible to recover the sand only.
At this time, gravel and waste need to be separated for disposal, and therefore a gravel waste separator is required. As the gravel waste separator, a conventional product upward flow classifier or the like can be used.
On the other hand, the outer peripheral part of the bottom wall has a strong swirl force of the sewage-mixed water, so that residue is likely to adhere and it may grow. By providing the portion, adhesion of residue can be prevented.
In addition, in the vicinity of the outer periphery of the bottom wall, the turning force is strong and the settling sand does not settle, so even if a nonporous portion without a sieve is provided, the processing capacity is not affected.

この場合、前記底壁を上下動可能に弾支することにより、汚砂混合水投入時に、砂利やごみの衝突、ごみの堆積や旋回流により常に変動する水圧等により、底壁の篩が振動(揺動)し、篩面で捕捉された砂利には常に上下方向の慣性力が働くことになり、篩目への砂利の挟まりを防止することができる。
また、運転完了後、ドレンで水を引き抜きながら、流入管から水を流入させると、流入水の落下エネルギーをばねのたわみエネルギーに変換することができ、流入を止めると篩は減衰振動を始めることから、この減衰振動による慣性力により逆洗による篩目清掃効果を得ることができる。
In this case, by supporting the bottom wall so that it can move up and down, the sieve on the bottom wall vibrates due to gravel and dust collision, water pressure constantly changing due to dust accumulation and swirling flow, etc. Gravitational force that swings and grabs on the sieving surface always has an inertial force in the vertical direction, so that gravel can be prevented from being caught in the sieving.
In addition, after the operation is complete, if water is introduced from the inflow pipe while drawing water with the drain, the falling energy of the inflowing water can be converted into the bending energy of the spring, and when the inflow is stopped, the sieve starts damped vibration. Therefore, the mesh cleaning effect by backwashing can be obtained by the inertial force due to the damped vibration.

また、前記沈降槽に給水する給水装置を設けることにより、投入砂量が少ない場合に給水し、固液分離槽の篩面に対して上昇流を発生させ、旋回流によるし渣の張り付きを少なくすることができる。   In addition, by providing a water supply device for supplying water to the settling tank, water is supplied when the amount of sand input is small, an upward flow is generated with respect to the sieve surface of the solid-liquid separation tank, and sticking of the residue due to swirling flow is reduced. can do.

また、前記底壁の篩目を上部が細いテーパ状に形成することにより、小石の挟まりを防止することが可能となり、これにより、篩目の閉塞を防止することができる。   Further, by forming the sieve mesh of the bottom wall in a tapered shape, the pebbles can be prevented from being pinched, thereby preventing the sieve mesh from being blocked.

以下、本発明の砂分離洗浄装置の実施の形態を、図面に基づいて説明する。   DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a sand separation and cleaning apparatus of the present invention will be described with reference to the drawings.

図1〜図2に、本発明の砂分離洗浄装置の第1実施例を示す。
この砂分離洗浄装置は、汚砂混合水が導入される固液分離槽1と、該固液分離槽1の下に設置される沈降槽2とを備えている。
そして、この砂分離洗浄装置は、固液分離槽1が、接線方向に汚砂混合水を流入させることにより周壁に沿い下降する旋回流を発生させる円筒状の筒壁3と、該筒壁3の底部に配設された逆さ裁頭円錐状の篩からなる底壁4と、該底壁4の中心付近の水を外部に排出する排水ダクト5とを備えるとともに、図7に示すように、前記底壁4の外周部に篩目のない無孔部42を設けている。
1 to 2 show a first embodiment of the sand separation and cleaning apparatus of the present invention.
This sand separation and cleaning device includes a solid-liquid separation tank 1 into which dirty sand mixed water is introduced, and a sedimentation tank 2 installed under the solid-liquid separation tank 1.
And this sand separation washing | cleaning apparatus is a cylindrical cylindrical wall 3 which the solid-liquid separation tank 1 produces | generates the swirl | vortex flow which descends along a surrounding wall by injecting waste-sand mixed water in a tangential direction, and this cylindrical wall 3 7 includes a bottom wall 4 made of an inverted frustoconical sieve disposed at the bottom of the bottom wall and a drainage duct 5 for discharging water near the center of the bottom wall 4 to the outside, as shown in FIG. A nonporous portion 42 without a sieve is provided on the outer peripheral portion of the bottom wall 4.

筒壁3の上部には、反転した旋回流を越流させる分離ホッパ6が設けられるとともに、該分離ホッパ6と筒壁3との間を旋回流が通るように汚砂混合水の流入管7が接線方向に接続されている。
流入管7には、ジェットポンプ等の揚砂ポンプ(図示省略)から汚砂混合水が圧送され、また、分離ホッパ6の周囲には、該分離ホッパ6の越流水を受ける環状の越流トラフ61が設置されている。
A separation hopper 6 for allowing the inverted swirling flow to flow over is provided at the upper part of the cylindrical wall 3, and an inflow pipe 7 for the mixed waste sand so that the swirling flow passes between the separating hopper 6 and the cylindrical wall 3. Are connected tangentially.
The inflow pipe 7 is pumped with sand mixed water from a sand pump (not shown) such as a jet pump, and an annular overflow trough that receives the overflow water of the separation hopper 6 around the separation hopper 6. 61 is installed.

底壁4は、パンチングスクリーン等により篩目が形成されたすり鉢状のものからなり、中央部には開口部41が形成されている。
ところで、この底壁4の外周部は沈降領域ではなく、また、外周部に篩目があるようにすると、旋回流の強い勢いによって篩目にし渣が絡まり易い。
このことから、図7に示すように、底壁4の外周部には、鉄板を重合したりすることによって篩目のない無孔部42が設けられている。この無孔部42の長さL1は、底壁円錐部の全長Lの10〜20%程度の長さに設定することが望ましい。
また、図7(c)に示すように、前記底壁4の篩目43を、上部が細いテーパ状に形成することにより、小石の挟まりを防止することが可能となり、これにより、篩目43の閉塞を防止することができる。
一方、この底壁4は、図1(b)に示すように、コイルばね8等によって上下動可能に弾支することも可能であり、これにより、汚砂混合水の投入時に、砂利やごみの衝突、ごみの堆積や旋回流により常に変動する水圧等により、底壁4の篩が振動(揺動)し、篩面で捕捉された砂利には常に上下方向の慣性力が働くことになり、篩目への砂利の挟まりを防止することができる。
The bottom wall 4 is formed in a mortar shape having a sieve mesh formed by a punching screen or the like, and an opening 41 is formed at the center.
By the way, the outer peripheral portion of the bottom wall 4 is not a sedimentation region, and if there is a sieve on the outer peripheral portion, the sieve tends to get entangled with a strong swirl force.
From this, as shown in FIG. 7, the non-porous part 42 without a sieve is provided in the outer peripheral part of the bottom wall 4 by superposing | stacking an iron plate. The length L1 of the non-hole portion 42 is desirably set to a length of about 10 to 20% of the total length L of the bottom wall conical portion.
Further, as shown in FIG. 7C, it is possible to prevent clogging of pebbles by forming the mesh 43 of the bottom wall 4 in a tapered shape with a thin upper portion. Can be prevented.
On the other hand, as shown in FIG. 1 (b), the bottom wall 4 can be elastically supported by a coil spring 8 or the like so as to be movable up and down. The screen of the bottom wall 4 vibrates (oscillates) due to the water pressure that constantly fluctuates due to the impact of dust, the accumulation of dust and the swirling flow, etc., and the inertia force in the vertical direction always acts on gravel captured on the screen surface. It is possible to prevent gravel from getting caught in the sieve mesh.

排水ダクト5は、底壁中心の上方に開口部41を有する管からなり、排水ダクト5の上方で、側壁の高さによって生じる水面のヘッド差hによって排水をオーバーフローさせることで、篩目から沈降する砂を吸い込まない程度の吸込流を発生させ、底壁4の中心付近に集まる砂利とごみの内、比重の小さいごみだけを水と共に吸い込んで外部に排出するようにしている。   The drainage duct 5 is composed of a pipe having an opening 41 above the center of the bottom wall, and the drainage is overflowed by the head difference h of the water surface caused by the height of the side wall above the drainage duct 5, thereby sinking from the sieve mesh. The suction flow is generated so as not to suck the sand to be sucked, and only the dust having a small specific gravity among the gravel and the dust collected near the center of the bottom wall 4 is sucked together with the water and discharged to the outside.

沈降槽2は、固液分離槽1の下に底壁4を境として連続的に配設されており、本実施例では、下部にスクリューコンベア9が一体に配設された矩形のものからなる。
沈降槽2には、この沈降槽2に給水する給水装置が設けられており、本実施例では、底壁4の下面に向かって水を噴射する逆洗ノズル10と共用されている。
The sedimentation tank 2 is continuously disposed below the solid-liquid separation tank 1 with the bottom wall 4 as a boundary. In this embodiment, the sedimentation tank 2 is formed in a rectangular shape in which a screw conveyor 9 is integrally disposed at the lower part. .
The settling tank 2 is provided with a water supply device for supplying water to the settling tank 2. In this embodiment, the settling tank 2 is shared with the backwash nozzle 10 that jets water toward the bottom surface of the bottom wall 4.

一方、上記砂分離洗浄装置において、図3に示すように、底壁4の開口部41に下方から気泡を供給し、底壁4の中心付近に乱流を発生させるエア供給装置14を設けることができる。
エア供給装置14は、ブロア15から配管16を介して、底壁4の開口部41の下方に設置した散気ノズル17から多数の微細気泡を発生させる。
また、このエア供給装置14は、図4に示すように、底壁4の裏面に下方から微細気泡を供給することもできる。
例えば、底壁4の下に設置した逆洗管18から逆洗水を供給するときには、逆洗効果を高めるために、ブロア15からのエアを散気ノズル17側から底壁裏面の逆洗ノズル19側にバルブを切り替え、底壁4の篩に付着したごみをエアブロー効果により浮上させることができる。
On the other hand, in the sand separating and cleaning apparatus, as shown in FIG. 3, an air supply device 14 is provided for supplying air bubbles from below to the opening 41 of the bottom wall 4 and generating turbulence near the center of the bottom wall 4. Can do.
The air supply device 14 generates a large number of fine bubbles from the air diffuser nozzle 17 installed below the opening 41 of the bottom wall 4 from the blower 15 through the pipe 16.
Further, as shown in FIG. 4, the air supply device 14 can also supply fine bubbles to the back surface of the bottom wall 4 from below.
For example, when backwash water is supplied from a backwash pipe 18 installed under the bottom wall 4, in order to enhance the backwash effect, air from the blower 15 is blown from the diffuser nozzle 17 side to the backwash nozzle on the back of the bottom wall. The valve is switched to the 19th side, and the dust adhering to the sieve of the bottom wall 4 can be floated by the air blow effect.

砂分離洗浄装置では、図5に示すように、ごみは、底壁4の表面上に形成される旋回流に乗って底壁4の中心付近に集まり、排水ダクト5の上向流によって引き抜かれるようになっている。
ところで、例えば、缶ジュースのプルタブや厚みの薄いゴム類等の薄板状のごみ20は、旋回流に対しては、水流を受ける面積が大きいことから流れに乗りやすい。
ところが、この薄板状のごみ20は、旋回流の作用によって縦向きの姿勢で集まることから、上向流に対しては水流を受ける面積が小さくなって流れに乗りにくくなり、これにより底壁4の開口部41から沈降する。
そこで、図3に示すように、底壁4の開口部41に下方から気泡を供給し、底壁4の中心付近に乱流を発生させることにより、縦向きの姿勢で集められた薄板状のごみ20を、乱流によって排水ダクト5に吸い込まれやすい縦向き以外の姿勢にし、これにより、沈降し易い薄板状のごみ20を排水ダクト5の上向流で吸い込むようにする。
In the sand separation and cleaning device, as shown in FIG. 5, the dust is collected in the vicinity of the center of the bottom wall 4 on the swirl flow formed on the surface of the bottom wall 4 and is extracted by the upward flow of the drainage duct 5. It is like that.
By the way, for example, the thin-plate-like garbage 20 such as a pull tab of can juice or a thin rubber is easy to ride on the swirling flow because the area receiving the water flow is large.
However, since the thin-plate-like garbage 20 is collected in a vertical posture by the action of the swirling flow, the area that receives the water flow becomes small with respect to the upward flow, and it becomes difficult to ride the flow. It settles from the opening part 41.
Therefore, as shown in FIG. 3, by supplying bubbles to the opening 41 of the bottom wall 4 from below and generating turbulent flow near the center of the bottom wall 4, thin plate-like shapes gathered in a vertical orientation are collected. The garbage 20 is placed in a posture other than the vertical direction that is easily sucked into the drainage duct 5 by turbulent flow, so that the thin-plate-like garbage 20 that tends to settle is sucked in the upward flow of the drainage duct 5.

また、万が一排水ダクト5が閉塞した際に、底壁4の中央にし渣や砂利溜まりができたり、これらが成長しないように、底壁4の開口部41周囲の下付近に、篩目を通して上方に水を噴射する噴射ノズル21を設置することができる。
この噴射ノズル21は、逆洗水投入と合わせてバッチ的に噴射するようにする。
水量は、例えば0.2m/min程度とし、逆洗水と合わせて水量を調整する。
なお、噴射位置は、噴射ノズル21で噴射していない箇所に汚砂が堆積しないように、2系列に分けた流入管7の対向位置に1対の噴射ノズル21を配設し、2系列の流入管7の揚砂運転を交互に切り替える。
これにより、堆積した汚砂22を揚砂水で飛ばすとともに、流入管7を切り替えて使うことにより、まんべんなく堆積を防止し、噴射ノズル21の数を少なくすることができる。
Also, in the unlikely event that the drainage duct 5 is blocked, the bottom wall 4 is left through the sieve mesh near the bottom of the opening 41 around the bottom wall 4 so that sediment and gravel pools do not form in the center of the bottom wall 4 and grow. An injection nozzle 21 for injecting water can be installed.
The spray nozzle 21 sprays in batches together with backwashing water input.
The amount of water is, for example, about 0.2 m 3 / min, and the amount of water is adjusted together with the backwash water.
In addition, the injection position is a pair of injection nozzles 21 disposed at the opposite position of the inflow pipe 7 divided into two lines so that dirt does not accumulate in the places where the injection nozzles 21 do not inject, and the two lines. The sanding operation of the inflow pipe 7 is switched alternately.
As a result, the accumulated dirty sand 22 is blown off by the pumped sand water, and the inflow pipe 7 is switched and used, so that the accumulation can be prevented and the number of the injection nozzles 21 can be reduced.

次に、この砂分離洗浄装置の動作を説明する。
ジェットポンプ等の揚砂ポンプから投入された汚砂混合水を、円筒型の固液分離槽1の接線方向から流入させることで旋回流を発生させる。
ここで発生させた旋回流による遠心力で砂と砂利とごみとが分散され、比重差分離されるとともに、底壁4の円錐篩で砂とごみを粒径分離する。
水流篩効果により円錐篩を通過した砂は矩形型の沈降槽2に沈降し、スクリューコンベア9で搬出される。
Next, the operation of this sand separation and cleaning apparatus will be described.
A swirl flow is generated by flowing the sewage mixed water supplied from a sand pump such as a jet pump from the tangential direction of the cylindrical solid-liquid separation tank 1.
Sand, gravel, and dust are dispersed by centrifugal force generated by the swirling flow generated here and separated by specific gravity, and sand and dust are separated by a conical sieve on the bottom wall 4.
The sand that has passed through the conical sieve due to the water sieve effect settles in the rectangular sedimentation tank 2 and is carried out by the screw conveyor 9.

一方、篩形状を円錐型としたことと旋回流によるスワール効果の相乗作用により、分離されたごみ及び砂利が自然に底壁4の中心付近に集まる。
そして、底壁4の中心で発生させた吸込流によりごみは排水と共に越流させ、また、砂利は底壁4の開口部41から沈降槽2に落下させ、砂と共に搬出させる。
従来の洗砂機は、砂とごみ、砂利が混在した状態で比重差分離をしていることから、砂の流出を抑えるために、排水ダクト5の吸込流速を大きくすることができなかったが、ここでは砂利とごみの重さが大きく異なるため、従来に比べて吸込流速を大きくすることが可能となり、ごみの除去効率を高めることができる。
また、排水ダクト5の吸込流により矩形型沈降槽2内にも流れを生じさせることで、篩の通過流量を増すことができ、篩効果を高めることができる。
On the other hand, the separated dust and gravel naturally gather near the center of the bottom wall 4 due to the synergistic effect of the conical shape of the sieve and the swirl effect caused by the swirling flow.
Then, the dust is caused to overflow with the drainage by the suction flow generated at the center of the bottom wall 4, and the gravel is dropped from the opening 41 of the bottom wall 4 to the settling tank 2 and carried out together with the sand.
Since the conventional sand washer separates the specific gravity in a state where sand, dust and gravel are mixed, the suction flow velocity of the drainage duct 5 could not be increased in order to suppress the outflow of sand. In this case, since the gravel and garbage are greatly different in weight, it is possible to increase the suction flow velocity as compared with the conventional case, and it is possible to increase the efficiency of removing the dust.
In addition, by causing a flow in the rectangular sedimentation tank 2 by the suction flow of the drainage duct 5, the passing flow rate of the sieve can be increased, and the sieving effect can be enhanced.

また、運転完了後もしくは集砂時に、篩面を逆洗することで篩面に付着したし渣や砂利を除去するようにする(ジェットポンプ式は1台の駆動水ポンプで揚砂、集砂を行うことが多く、この場合、洗浄槽内への沈砂投入は間欠投入である)。
同様に、篩面へのし渣の絡みつきを抑える目的で、沈降槽2に給水することができ、これにより、篩面に対して上昇流が発生し、旋回流によるし渣の張り付きを少なくすることができる。
但し、旋回流による下降流量が減少し、篩能力が落ちるため、投入砂量が少ない場合に限定される。
In addition, after the operation is completed or during sand collection, the screen surface is back-washed to remove residue and gravel attached to the screen surface (the jet pump type uses a single drive water pump for sanding and sand collection) In this case, the sand settling into the washing tank is intermittent).
Similarly, water can be supplied to the settling tank 2 for the purpose of suppressing the entanglement of the screen residue on the screen surface, thereby generating an upward flow with respect to the screen surface and reducing sticking of the screen residue due to the swirling flow. be able to.
However, since the descending flow rate due to the swirl flow is reduced and the sieving ability is reduced, the amount of sand input is limited.

かくして、本実施例の砂分離洗浄装置は、汚砂混合水が導入される固液分離槽1と、該固液分離槽1の下に設置される沈降槽2とを備えた砂分離洗浄装置において、前記固液分離槽1が、接線方向に汚砂混合水を流入させることにより周壁に沿い下降する旋回流を発生させる円筒状の筒壁3と、該筒壁3の底部に配設された逆さ裁頭円錐状の篩からなる底壁4と、該底壁4の中心付近の水を外部に排出する排水ダクト5とを備えることから、旋回流による遠心力で汚砂とごみとを分散し比重差分離するとともに、底壁4の篩により砂と砂利とを粒径分離し、これにより、底壁4の中心付近に比重差の大きいごみと砂利とを集め、比重の大きい砂利は底壁4中心から沈降槽2に落下させて砂と共に回収する一方、比重の小さいごみを効率よく選択的に排水ダクト5により水と共に排出することができる。
すなわち、従来では、砂とごみ、砂利が混在した状態で比重差分離をしていることから、砂の流出を抑えるために、排水ダクト5の吸込流速を大きくすることができなかったが、本実施例では、比重が大きく異なる砂利とごみを比重差分離するため、従来に比べて吸込流速を大きくすることが可能となり、ごみの除去効率を高めることができる。
また、排水ダクト5の強い吸込流で沈降槽2内の水を吸い込むことにより、底壁4の篩通過流量を増やすことができ、これにより、篩効果を高めることができる。
一方、底壁4の外周部は、汚砂混合水の旋回力が強いため、し渣が付着し易く、また、それが成長する恐れがあるが、底壁4の外周部に篩目のない無孔部42を設けることにより、底壁4へのし渣の付着を防止することができる。
なお、底壁4の外周付近は旋回力が強く、沈砂が沈降しないので、篩目のない無孔部42を設けても処理能力には影響しない。
Thus, the sand separation and washing apparatus of the present embodiment is a sand separation and washing apparatus provided with a solid / liquid separation tank 1 into which dirty sand mixed water is introduced and a sedimentation tank 2 installed under the solid / liquid separation tank 1. The solid-liquid separation tank 1 is disposed at a cylindrical cylindrical wall 3 that generates a swirling flow that descends along the peripheral wall by flowing sewage mixed water in a tangential direction, and at the bottom of the cylindrical wall 3. In addition, a bottom wall 4 made of an upside-down conical sieve and a drainage duct 5 for discharging water near the center of the bottom wall 4 to the outside, so that dirt and dust can be removed by centrifugal force due to swirling flow. While separating and separating the specific gravity difference, the sand and gravel are separated by the particle size by the sieve of the bottom wall 4, thereby collecting garbage and gravel having a large specific gravity difference near the center of the bottom wall 4. While dropping from the center of the bottom wall 4 into the sedimentation tank 2 and collecting it with sand, it efficiently selects trash with a low specific gravity. It can be discharged together with water by to drainage duct 5.
That is, conventionally, since the specific gravity difference separation is performed in a state where sand, waste, and gravel are mixed, the suction flow velocity of the drainage duct 5 cannot be increased in order to suppress the outflow of sand. In the embodiment, gravel and waste having different specific gravities are separated by specific gravity difference, so that the suction flow rate can be increased as compared with the conventional case, and the removal efficiency of dust can be increased.
Moreover, by sucking the water in the sedimentation tank 2 with a strong suction flow of the drainage duct 5, the flow rate of the sieve wall passing through the bottom wall 4 can be increased, thereby enhancing the sieving effect.
On the other hand, the outer peripheral portion of the bottom wall 4 has a strong swirling force of the sewage-mixed water, so that residue is likely to adhere to it, and it may grow, but there is no sieve on the outer peripheral portion of the bottom wall 4. By providing the non-hole part 42, adhesion of residue to the bottom wall 4 can be prevented.
In addition, since the turning force is strong in the vicinity of the outer periphery of the bottom wall 4 and the settling sand does not settle, even if the non-porous portion 42 without a sieve is provided, the processing capacity is not affected.

この場合、前記底壁4を上下動可能に弾支することにより、汚砂混合水投入時に、砂利やごみの衝突、ごみの堆積や旋回流により常に変動する水圧等により、底壁4の篩が振動(揺動)し、篩面で捕捉された砂利には常に上下方向の慣性力が働くことになり、篩目への砂利の挟まりを防止することができる。
また、運転完了後、ドレンで水を引き抜きながら、流入管7から水を流入させると、流入水の落下エネルギーをばねのたわみエネルギーに変換することができ、流入を止めると篩は減衰振動を始めることから、この減衰振動による慣性力により逆洗による篩目清掃効果を得ることができる。
In this case, by supporting the bottom wall 4 so as to be movable up and down, the sieve of the bottom wall 4 is caused by water pressure that constantly fluctuates due to gravel and dust collision, dust accumulation and swirling flow, etc. when the sewage mixed water is introduced. Vibrates (oscillates), and the gravitational force captured by the sieve surface always has an inertial force in the vertical direction, so that gravel can be prevented from being caught in the sieve mesh.
In addition, after the operation is completed, when water is introduced from the inflow pipe 7 while draining water with the drain, the falling energy of the inflowing water can be converted into the bending energy of the spring, and when the inflow is stopped, the sieve starts damped vibration. Therefore, the mesh cleaning effect by backwashing can be obtained by the inertial force due to the damped vibration.

また、前記沈降槽2に給水する給水装置を設けることにより、投入砂量が少ない場合に給水し、固液分離槽1の篩面に対して上昇流を発生させ、旋回流によるし渣の張り付きを少なくすることができる。   In addition, by providing a water supply device for supplying water to the settling tank 2, water is supplied when the amount of sand input is small, and an upward flow is generated with respect to the sieve surface of the solid-liquid separation tank 1, and the residue is stuck by swirling flow. Can be reduced.

一方、底壁4の開口部41に下方から気泡を供給し、底壁4の中心付近に乱流を発生させるエア供給装置14を設けることにより、旋回流によって縦向きの姿勢で集められる薄板状のごみ20を、乱流によって排水ダクト5に吸い込まれやすい姿勢にすることができ、これにより、沈降し易い薄板状のごみ20を排水ダクト5で吸い込んで排出することができる。
また、エア供給装置14が、底壁4の裏面に下方から気泡を供給することにより、逆洗時に、底壁4の篩に付着したごみをエアブロー効果により浮上させることができる。
On the other hand, by providing an air supply device 14 that supplies bubbles from below to the opening 41 of the bottom wall 4 and generates turbulent flow near the center of the bottom wall 4, a thin plate shape that is collected in a vertical orientation by a swirling flow The waste 20 can be in a posture that is easily sucked into the drainage duct 5 by turbulent flow, and thereby, the thin plate-like dust 20 that easily settles can be sucked in and discharged from the drainage duct 5.
In addition, the air supply device 14 supplies air bubbles from below to the back surface of the bottom wall 4, so that dust attached to the screen of the bottom wall 4 can be lifted by the air blow effect during backwashing.

また、篩目を通して上方に水を噴射する噴射ノズル21を底壁4の下に設けることにより、万が一排水ダクト5が閉塞しても、逆洗水投入に合わせて噴射することにより、底壁4と排水ダクト5の間で汚砂がブリッジすることを防止し、処理を継続することができる。
さらに、前記底壁4の篩目43を、上部が細いテーパ状に形成することにより、小石の挟まりを防止することが可能となり、これにより、篩目43の閉塞を防止することができる。
Further, by providing an injection nozzle 21 under the bottom wall 4 for injecting water upward through the sieve mesh, even if the drainage duct 5 is blocked, the bottom wall 4 can be injected in accordance with backwash water injection. It is possible to prevent the dirty sand from bridging between the drainage duct 5 and the drainage duct 5 and to continue the processing.
Further, by forming the sieve 43 of the bottom wall 4 in a tapered shape with a thin upper part, it becomes possible to prevent clogging of pebbles, thereby preventing the sieve 43 from being blocked.

図6に、本発明の砂分離洗浄装置の第2実施例を示す。
この砂分離洗浄装置は、汚砂混合水が導入される固液分離槽1と、該固液分離槽1の下に設置される沈降槽2とを備えている。
そして、この砂分離洗浄装置は、前記固液分離槽1が、接線方向に汚砂混合水を流入させることにより周壁に沿い下降する旋回流を発生させる円筒状の筒壁3と、該筒壁3の底部に配設された逆さ裁頭円錐状の篩からなる底壁4と、該底壁4の開口部41と固液分離槽1の上部とを接続する循環ダクト11と、該循環ダクト11の一部に接続されたエジェクタ12とを備えるとともに、図7に示すように、前記底壁4の外周部に篩目のない無孔部42を設けている。
なお、図6において、第1実施例と同一部材は、同一符号を記すことによりその説明を省略する。
FIG. 6 shows a second embodiment of the sand separating and cleaning apparatus of the present invention.
This sand separation and cleaning device includes a solid-liquid separation tank 1 into which dirty sand mixed water is introduced, and a sedimentation tank 2 installed under the solid-liquid separation tank 1.
And this sand separation washing | cleaning apparatus has the cylindrical cylinder wall 3 which the said solid-liquid separation tank 1 produces | generates the swirl | vortex flow which descends along a surrounding wall by making waste-sand mixed water flow in in a tangential direction, and this cylinder wall 3, a bottom wall 4 made of an inverted frustoconical sieve, a circulation duct 11 connecting the opening 41 of the bottom wall 4 and the upper part of the solid-liquid separation tank 1, and the circulation duct 11 and an ejector 12 connected to a part of the bottom wall 11, and a non-sealed portion 42 without a sieve is provided on the outer peripheral portion of the bottom wall 4 as shown in FIG.
In FIG. 6, the same members as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

前記した第1実施例の砂分離洗浄装置は、底壁4の中心付近に沈降槽2に連通する開口部を設けているため、砂利と同じ比重、重量を持つレキ片、ガラス片等は砂利と共に沈降槽2に沈降する可能性がある。
本実施例では、さらに高度にごみを除去する手段として、底壁中心の開口部41を、沈降槽2に連通させることなく、循環ダクト11に接続している。
このとき、篩上や循環ダクト11にはごみや砂利が溜まっていくので、エジェクタ12により一定時間毎に固液分離槽1内を再循環させ、篩動作を繰り返し、運転完了後に残ったごみと砂利を分岐管13から槽外に引き抜くようにする。
なお、砂利とごみは処分上分離する必要があるため、後工程に砂利ごみ分離機が必要となるが、砂利ごみ分離機は従来製品の上向流式分級機等を用いることができる。
また、砂利はコンテナ等に回収し、ごみは排水と共に流して、沈砂池に戻すようにする。
The sand separation and cleaning apparatus of the first embodiment described above is provided with an opening communicating with the settling tank 2 in the vicinity of the center of the bottom wall 4, so that the gravel pieces, glass pieces, etc. having the same specific gravity and weight as gravel are gravel. At the same time, there is a possibility of settling in the settling tank 2.
In the present embodiment, the opening 41 at the center of the bottom wall is connected to the circulation duct 11 without communicating with the settling tank 2 as a means for removing dust to a higher degree.
At this time, since dust and gravel accumulate on the sieve and the circulation duct 11, the inside of the solid-liquid separation tank 1 is recirculated by the ejector 12 every predetermined time, and the sieving operation is repeated. The gravel is pulled out of the tank from the branch pipe 13.
In addition, since it is necessary to isolate | separate gravel and waste on disposal, a gravel waste separator is required in a post process, but the upward flow type classifier etc. of a conventional product can be used for a gravel waste separator.
Gravel is collected in a container, etc., and waste is washed away with waste water and returned to the sand basin.

かくして、本実施例の砂分離洗浄装置は、汚砂混合水が導入される固液分離槽1と、該固液分離槽1の下に設置される沈降槽2とを備えた砂分離洗浄装置において、前記固液分離槽1が、接線方向に汚砂混合水を流入させることにより周壁に沿い下降する旋回流を発生させる円筒状の筒壁3と、該筒壁3の底部に配設された逆さ裁頭円錐状の篩からなる底壁4と、該底壁4の開口部41と固液分離槽1の上部とを接続する循環ダクト11と、該循環ダクト11の一部に接続されたエジェクタ12とを備えることから、旋回流による遠心力で汚砂とごみとを分散し比重差分離するとともに、底壁4の篩により砂と砂利とを粒径分離して、底壁4の中心付近に比重差の大きいごみと砂利を集め、エジェクタ12及び循環ダクト11により一定時間毎に溜まったごみと砂利を固液分離槽1内を再循環させ、運転完了後に残ったごみや砂利を槽外に引き抜くことにより、砂利と共に沈降する可能性のあるレキ片やガラス片と区別し、砂のみを回収することができる。
一方、底壁4の外周部は、汚砂混合水の旋回力が強いため、し渣が付着し易く、また、それが成長する恐れがあるが、底壁4の外周部に篩目のない無孔部42を設けることにより、し渣の付着を防止することができる。
なお、底壁4の外周付近は旋回力が強く、沈砂が沈降しないので、篩目のない無孔部42を設けても処理能力には影響しない。
Thus, the sand separation and washing apparatus of the present embodiment is a sand separation and washing apparatus provided with a solid / liquid separation tank 1 into which dirty sand mixed water is introduced and a sedimentation tank 2 installed under the solid / liquid separation tank 1. The solid-liquid separation tank 1 is disposed at a cylindrical cylindrical wall 3 that generates a swirling flow that descends along the peripheral wall by flowing sewage mixed water in a tangential direction, and at the bottom of the cylindrical wall 3. Connected to a bottom wall 4 made of an inverted cone-shaped sieve, a circulation duct 11 connecting the opening 41 of the bottom wall 4 and the upper part of the solid-liquid separation tank 1, and a part of the circulation duct 11. The ejector 12 is provided to disperse the sand and dust by centrifugal force due to the swirling flow, separate the specific gravity difference, and separate the particle size of the sand and gravel by the sieve of the bottom wall 4. Garbage and gravel with a large specific gravity difference are collected near the center. Recycle the dirt and gravel collected in the solid-liquid separation tank 1 and pull out the remaining garbage and gravel outside the tank after the operation is completed to distinguish them from rubble pieces and glass pieces that may settle with the gravel. Only sand can be recovered.
On the other hand, the outer peripheral portion of the bottom wall 4 has a strong swirling force of the sewage-mixed water, so that residue is likely to adhere to it, and it may grow, but there is no sieve on the outer peripheral portion of the bottom wall 4. By providing the non-perforated portion 42, it is possible to prevent adhesion of residue.
In addition, since the turning force is strong in the vicinity of the outer periphery of the bottom wall 4 and the settling sand does not settle, even if the non-porous portion 42 without a sieve is provided, the processing capacity is not affected.

以上、本発明の砂分離洗浄装置について、複数の実施例に基づいて説明したが、本発明は上記実施例に記載した構成に限定されるものではなく、その趣旨を逸脱しない範囲において適宜その構成を変更することができる。   As mentioned above, although the sand separation washing | cleaning apparatus of this invention was demonstrated based on several Example, this invention is not limited to the structure described in the said Example, The structure is suitably in the range which does not deviate from the meaning. Can be changed.

本発明の砂分離洗浄装置は、沈砂池等から揚砂された汚砂の臭気を除去するとともに砂中に含まれる夾雑物を高度に除去することから、例えば、汚砂を高度に洗浄することにより産業廃棄物の対象から除外するような場合に好適に適用することができる。   The sand separation and cleaning apparatus of the present invention removes the odor of the sand that has been pumped from a sand basin and the like, and highly removes impurities contained in the sand. Therefore, the present invention can be preferably applied to the case where it is excluded from the object of industrial waste.

本発明の砂分離洗浄装置の第1実施例を示し、(a)はその断面図、(b)は底壁を弾支した断面図である。The 1st Example of the sand separation washing | cleaning apparatus of this invention is shown, (a) is the sectional drawing, (b) is sectional drawing which supported the bottom wall elastically. 同実施例の砂分離洗浄装置を示す全体図である。It is a general view which shows the sand separation washing | cleaning apparatus of the Example. 同砂分離洗浄装置にエア供給装置を設けた変形実施例を示す断面図である。It is sectional drawing which shows the modification which provided the air supply apparatus in the sand separation washing | cleaning apparatus. エア供給装置に逆洗ノズルを設けた変形実施例を示す断面図である。It is sectional drawing which shows the modification which provided the backwashing nozzle in the air supply apparatus. 旋回流と上向流による薄板状のごみの動きを示す説明図である。It is explanatory drawing which shows the motion of the thin-plate-like refuse by a swirl flow and an upward flow. 本発明の砂分離洗浄装置の第2実施例を示す断面図である。It is sectional drawing which shows 2nd Example of the sand separation washing | cleaning apparatus of this invention. 本発明の砂分離洗浄装置の底壁を示し、(a)は斜視図、(b)は正面図、(c)は拡大断面図である。The bottom wall of the sand separation washing | cleaning apparatus of this invention is shown, (a) is a perspective view, (b) is a front view, (c) is an expanded sectional view. 同底壁と噴射のズルを示し、(a)は正面図、(b)は平面図である。The bottom wall and the jet nozzle are shown, (a) is a front view and (b) is a plan view.

符号の説明Explanation of symbols

1 固液分離槽
2 沈降槽
3 筒壁
4 底壁
41 開口部
42 無孔部
43 篩目
5 排水ダクト
6 分離ホッパ
61 越流トラフ
7 流入管
8 コイルばね
9 スクリューコンベア
10 逆洗ノズル(給水装置)
11 循環ダクト
12 エジェクタ
13 分岐管
14 エア供給装置
15 ブロア
16 配管
17 散気ノズル
18 逆洗管
19 逆洗ノズル
20 薄板状のごみ
21 噴射ノズル
22 汚砂
DESCRIPTION OF SYMBOLS 1 Solid-liquid separation tank 2 Sedimentation tank 3 Cylindrical wall 4 Bottom wall 41 Opening part 42 Non-hole part 43 Sieve 5 Drain duct 6 Separation hopper 61 Overflow trough 7 Inflow pipe 8 Coil spring 9 Screw conveyor 10 Backwash nozzle (water supply device) )
DESCRIPTION OF SYMBOLS 11 Circulation duct 12 Ejector 13 Branch pipe 14 Air supply apparatus 15 Blower 16 Piping 17 Air diffuser nozzle 18 Backwash pipe 19 Backwash nozzle 20 Thin plate-shaped garbage 21 Injection nozzle 22 Dirty sand

Claims (8)

汚砂混合水が導入される固液分離槽と、該固液分離槽の下に設置される沈降槽とを備えた砂分離洗浄装置において、前記固液分離槽が、接線方向に汚砂混合水を流入させることにより周壁に沿い下降する旋回流を発生させる円筒状の筒壁と、該筒壁の底部に配設された逆さ裁頭円錐状の篩からなる底壁と、該底壁の中心付近の水を外部に排出する排水ダクトとを備えるとともに、前記底壁の外周部に篩目のない無孔部を設けたことを特徴とする砂分離洗浄装置。   In a sand separation and washing apparatus comprising a solid / liquid separation tank into which sewage mixed water is introduced and a sedimentation tank installed under the solid / liquid separation tank, the solid / liquid separation tank is mixed with sewage sand in a tangential direction. A cylindrical tube wall that generates a swirling flow descending along the peripheral wall by flowing water, a bottom wall formed of an inverted frustoconical sieve disposed at the bottom of the tube wall, and A sand separating and cleaning apparatus comprising: a drainage duct for discharging water near the center to the outside, and a nonporous portion without a sieve provided in an outer peripheral portion of the bottom wall. 底壁の開口部に下方から気泡を供給し、底壁の中心付近に乱流を発生させるエア供給装置を設けたことを特徴とする請求項1記載の砂分離洗浄装置。   2. The sand separating and cleaning apparatus according to claim 1, further comprising an air supply device that supplies air bubbles from below to the opening of the bottom wall and generates turbulent flow near the center of the bottom wall. エア供給装置が、底壁の裏面に下方から気泡を供給することを特徴とする請求項2記載の砂分離洗浄装置。   The sand separating and cleaning device according to claim 2, wherein the air supply device supplies air bubbles to the back surface of the bottom wall from below. 篩目を通して上方に水を噴射する噴射ノズルを底壁の下に設けたことを特徴とする請求項1、2又は3記載の砂分離洗浄装置。   4. The sand separating and cleaning device according to claim 1, wherein an injection nozzle for injecting water upward through the sieve mesh is provided under the bottom wall. 汚砂混合水が導入される固液分離槽と、該固液分離槽の下に設置される沈降槽とを備えた砂分離洗浄装置において、前記固液分離槽が、接線方向に汚砂混合水を流入させることにより周壁に沿い下降する旋回流を発生させる円筒状の筒壁と、該筒壁の底部に配設された逆さ裁頭円錐状の篩からなる底壁と、該底壁の開口部と固液分離槽の上部とを接続する循環ダクトと、該循環ダクトの一部に接続されたエジェクタとを備えるとともに、前記底壁の外周部に篩目のない無孔部を設けたことを特徴とする砂分離洗浄装置。   In a sand separation and washing apparatus comprising a solid / liquid separation tank into which sewage mixed water is introduced and a sedimentation tank installed under the solid / liquid separation tank, the solid / liquid separation tank is mixed with sewage sand in a tangential direction. A cylindrical tube wall that generates a swirling flow descending along the peripheral wall by flowing water, a bottom wall formed of an inverted frustoconical sieve disposed at the bottom of the tube wall, and A circulation duct that connects the opening and the upper part of the solid-liquid separation tank, and an ejector connected to a part of the circulation duct, and a nonporous portion without a sieve are provided on the outer peripheral portion of the bottom wall. A sand separating and cleaning device characterized by that. 前記底壁を上下動可能に弾支したことを特徴とする請求項1、2、3、4又は5記載の砂分離洗浄装置。   The sand separating and cleaning apparatus according to claim 1, 2, 3, 4, or 5, wherein the bottom wall is elastically supported so as to be movable up and down. 前記沈降槽に給水する給水装置を設けたことを特徴とする請求項1、2、3、4、5又は6記載の砂分離洗浄装置。   The sand separating and cleaning apparatus according to claim 1, further comprising a water supply device for supplying water to the settling tank. 前記底壁の篩目を上部が細いテーパ状に形成したことを特徴とする請求項1、2、3、4、5、6又は7記載の砂分離洗浄装置。   The sand separating and cleaning apparatus according to claim 1, 2, 3, 4, 5, 6 or 7, wherein the top of the bottom wall has a narrow tapered shape.
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