JP2003080009A - Method and apparatus for removing sand in dirty water treating equipment - Google Patents

Method and apparatus for removing sand in dirty water treating equipment

Info

Publication number
JP2003080009A
JP2003080009A JP2001279402A JP2001279402A JP2003080009A JP 2003080009 A JP2003080009 A JP 2003080009A JP 2001279402 A JP2001279402 A JP 2001279402A JP 2001279402 A JP2001279402 A JP 2001279402A JP 2003080009 A JP2003080009 A JP 2003080009A
Authority
JP
Japan
Prior art keywords
sand
screen
tank
water
water tank
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
JP2001279402A
Other languages
Japanese (ja)
Inventor
Norihiro Yaide
乃大 矢出
Takahiro Okawa
高寛 大川
Hajime Seki
一 関
Kazuo Sato
一夫 佐藤
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ebara Corp
Original Assignee
Ebara Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ebara Corp filed Critical Ebara Corp
Priority to JP2001279402A priority Critical patent/JP2003080009A/en
Publication of JP2003080009A publication Critical patent/JP2003080009A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/10—Biological treatment of water, waste water, or sewage

Landscapes

  • Activated Sludge Processes (AREA)
  • Filtration Of Liquid (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a method and an apparatus for removing sand, by which the sand accumulated in a dirty water treating equipment can be removed without stopping the operation of the dirty water treating equipment. SOLUTION: The sand removing method comprises a sand pumping-up step to remove the sand accumulated in a water tank in the dirty water treating equipment without interrupting the operation of the dirty water treating equipment and a screen separation step to separate the sand contained in process water sent from the sand pumping-up step by making the process water pass through a screen. The sand can be separated at the screen separation step by adding a fiber to the process water and catching the sand by the fiber. A biological reaction tank for biologically decomposing the organic matter in the dirty water to remove it can be used as the water tank in the dirty water treating equipment. Activated sludge-mixed liquid being the liquid separated at the screen separation step can be returned to the biological reaction tank.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【発明の属する技術分野】本発明は、汚水処理設備内の
砂の処理に係り、特に、下水、し尿、産業排水を浄化す
るための処理設備の水槽などの底部や、生物処理工程の
生物反応槽の底部に堆積する砂の除去方法と装置に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the treatment of sand in sewage treatment equipment, and more particularly to the bottom of water tanks of treatment equipment for purifying sewage, human waste and industrial wastewater, and biological reactions in biological treatment processes. The present invention relates to a method and an apparatus for removing sand accumulated on the bottom of a tank.

【０００２】[0002]

【従来の技術】下水、し尿、産業排水等の汚水に含まれ
る砂や、処理設備の外部から風などによって設備内に持
ち込まれる砂は、水槽底部に堆積する。設備に堆積した
砂は、汚水や汚泥などを移送するポンプなどの機器類の
摩耗や閉塞の原因となる。また、生物反応槽に砂が溜ま
ると、水槽の有効容量が低下し、生物処理が過負荷にな
り有機物除去の効率が低下する。さらに、生物反応槽に
おいて、槽内の液のＤＯ濃度を維持するために、水槽底
部に配備された曝気用空気配管が閉塞して、生物反応槽
への空気が供給できなくなり、生物処理が困難になる。
また、汚泥処理においても、水槽底部に堆積した砂の一
部が、汚水処理から発生する汚泥に含まれると、この汚
泥を脱水する脱水機の摩耗や閉塞が重大な問題になる。2. Description of the Related Art Sand contained in wastewater such as sewage, night soil, industrial wastewater, and the like brought into the facility by wind from the outside of the treatment facility is accumulated at the bottom of the aquarium. The sand accumulated in the equipment causes wear and blockage of equipment such as pumps that transfer wastewater and sludge. Further, when sand is accumulated in the biological reaction tank, the effective capacity of the water tank is reduced, the biological treatment is overloaded, and the efficiency of organic matter removal is reduced. Further, in the biological reaction tank, in order to maintain the DO concentration of the liquid in the tank, the aeration air pipe provided at the bottom of the water tank is blocked, and air cannot be supplied to the biological reaction tank, which makes biological treatment difficult. become.
Also in sludge treatment, if a part of the sand accumulated at the bottom of the water tank is included in the sludge generated from the wastewater treatment, wear and blockage of a dehydrator that dehydrates this sludge becomes a serious problem.

【０００３】砂を除去するには、水槽の水を排出し、バ
キューム車や吸引装置を搭載したダンパー車により、堆
積した砂をその他の汚泥や水と共に水槽から排出する清
掃作業が、人手により行われている。このように、現状
では、水槽底部から砂を除去して、衛生的に効率よく処
理する有効な方法がない。従来技術により、水槽を清掃
する際に排出される清掃液は、産業廃棄物として処分さ
れたり、仮設の水槽にこの清掃液を受け入れて砂分を沈
ませたのち、砂以外で沈みにくい汚泥を含む上澄み液は
汚水処理設備で処理される。また、水槽に持ち込まれる
砂を、事前に遠心分離機により除去する方法が提案され
ている（特開平２−２３７６９０号公報）。In order to remove the sand, the water in the water tank is drained, and a cleaning work is performed manually to discharge the accumulated sand from the water tank together with other sludge and water using a vacuum truck or a damper vehicle equipped with a suction device. It is being appreciated. As described above, at present, there is no effective method for removing sand from the bottom of the water tank and treating it hygienically and efficiently. According to the conventional technology, the cleaning liquid discharged when cleaning the water tank is disposed of as industrial waste, or after receiving the cleaning liquid in a temporary water tank to sink the sand, sludge that does not easily sink except sand is removed. The supernatant liquid containing it is treated in a wastewater treatment facility. Further, a method has been proposed in which sand brought into a water tank is removed in advance by a centrifuge (JP-A-2-237690).

【０００４】これらの従来方法には、以下のような問題
点がある。 （１）砂を除去する作業中は、汚水処理を一時的に中止
する必要があり、停止期間が長いと、汚水処理性能が再
び発揮されるのに時間が必要である。 （２）従来の砂除去作業に、汚水処理を継続して行う場
合には、砂除去対象の設備に代わる仮設の水槽など、運
転に必要な機器や機械類が新たに必要である。 （３）一般に汚水処理設備は、砂を効果的に除去するよ
うに設計されておらず、砂を含む清掃液を汚水処理設備
で処理するのが困難である。砂が処理水にリークして、
汚水処理設備内に再度堆積する。 （４）事前に砂だけを除去する方法は、砂による遠心分
離機の摩耗が問題であり、流入する汚水や搬入されるし
尿などは、遠心分離機に通す前に受入槽に一旦受け入れ
ないと、安定した遠心分離が行えない。受入槽に受け入
れると、そこで砂が分離し、水槽底部に沈降堆積すると
いう問題が生じる。These conventional methods have the following problems. (1) It is necessary to temporarily stop the wastewater treatment during the sand removal work, and if the stop period is long, it takes time for the wastewater treatment performance to be exhibited again. (2) When the wastewater treatment is continuously performed in the conventional sand removal work, equipment and machinery necessary for operation such as a temporary water tank in place of the equipment for sand removal are newly required. (3) Generally, sewage treatment equipment is not designed to effectively remove sand, and it is difficult to treat a cleaning liquid containing sand with the sewage treatment equipment. Sand leaks into the treated water,
Redeposit in wastewater treatment facility. (4) In the method of removing only sand in advance, the abrasion of the centrifuge due to sand is a problem, and the inflowing sewage and the discharged human waste must be once received in the receiving tank before passing through the centrifuge. , Stable centrifugation cannot be performed. When it is received in the receiving tank, there is a problem that the sand is separated there and settles and accumulates at the bottom of the water tank.

【０００５】[0005]

【発明が解決しようとする課題】本発明は、上記従来技
術に鑑み、汚水処理設備の運転を停止することなく、堆
積した砂を除去することができる砂の除去方法とその装
置を提供することを課題とする。SUMMARY OF THE INVENTION In view of the above-mentioned prior art, the present invention provides a sand removing method and apparatus capable of removing accumulated sand without stopping the operation of wastewater treatment equipment. Is an issue.

【０００６】[0006]

【課題を解決するための手段】上記課題を解決するため
に、本発明では、汚水処理設備内の水槽に堆積した砂
を、該設備の運転を中断することなく除去する揚砂工程
と、揚砂工程からの砂を含む工程水を、スクリーンを通
して砂を分離するスクリーン分離工程からなることを特
徴とする砂の除去方法としたものである。前記砂の除去
方法において、スクリーン分離工程での砂の分離は、揚
砂工程からの砂を含む工程水に繊維を添加して、その繊
維に砂を捕捉させて行うことができ、また、前記汚水処
理設備内の水槽が、汚水の有機物を生物学的に分解除去
する生物反応槽であり、前記スクリーン分離工程で分離
された分離液の活性汚泥混合液を前記の生物反応槽に返
送することができる。また、本発明では、汚水処理設備
内の水槽に堆積する砂を、該設備の運転中に吸引除去す
る吸引装置と、吸引除去した砂を含む水から砂を分離す
る砂分離用スクリーンからなることを特徴とする砂の除
去装置としたものであり、前記吸引除去した砂を含む水
に、繊維を添加する添加手段を有することができる。In order to solve the above problems, in the present invention, a sand lifting step for removing sand accumulated in a water tank in a wastewater treatment facility without interrupting the operation of the facility, and a lifting process. This is a method for removing sand, characterized in that it comprises a screen separation step of separating the sand containing sand from the sand step through a screen. In the method for removing sand, the separation of sand in the screen separation step can be performed by adding fibers to the step water containing sand from the sand lifting step, and capturing the sand in the fibers. The water tank in the sewage treatment facility is a biological reaction tank that biologically decomposes and removes the organic matter of the sewage, and returns the activated sludge mixed solution of the separated liquid separated in the screen separation step to the biological reaction tank. You can Further, in the present invention, the sand accumulated in the water tank in the sewage treatment equipment comprises a suction device for sucking and removing the sand during the operation of the equipment, and a sand separating screen for separating the sand from the water containing the sand removed by suction. And a means for adding fibers to the water containing the sand removed by suction.

【０００７】[0007]

【発明の実施の形態】次に、本発明を、図面を参照して
詳細に説明する。図１は、本発明の汚水処理設備の水槽
における砂除去方法のフロー工程図、図２は、本発明の
繊維を添加する中継水槽を組み込んだ砂除去方法のフロ
ー工程図、図３は、本発明を生物反応槽に適用した場合
の砂除去方法のフロー工程図である。まず、図１の本発
明の汚水処理設備の運転を中断することなく、処理工程
の水槽に堆積した砂を除去する揚砂工程と、砂を含む工
程水をスクリーンで砂を分離するスクリーン分離工程か
らなる砂の除去方法について説明する。本発明で汚水と
は、下水、し尿、埋立処分場浸出水、産業排水等であ
る。工程水は、水槽底部の砂を除去する際に排出される
もので、多量の砂を含む液である。これには、砂以外の
汚泥などの固形物と溶解性塩類が含まれる。DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described in detail with reference to the drawings. FIG. 1 is a flow step diagram of a sand removing method in a water tank of a wastewater treatment facility of the present invention, FIG. 2 is a flow step diagram of a sand removing method incorporating a fiber-added relay water tank of the present invention, and FIG. It is a flow process figure of the sand removal method when applying the invention to a biological reaction tank. First, without stopping the operation of the sewage treatment equipment of the present invention in FIG. 1, a sand lifting step for removing sand accumulated in the water tank of the treatment step, and a screen separation step for separating the process water containing sand with a screen. A method for removing sand consisting of the following will be explained. In the present invention, sewage refers to sewage, night soil, landfill disposal leachate, industrial wastewater, and the like. The process water is discharged when the sand at the bottom of the water tank is removed, and is a liquid containing a large amount of sand. This includes solids such as sludge other than sand and soluble salts.

【０００８】砂とは、比重２以上、粒子径が３ｍｍ以下
の水に不溶の無機物である。砂には、天然砂の他に金属
酸化物、金属粒子を含む。砂の含有量に制限はなく、砂
の堆積量や砂とその他の固形物との割合についても制限
はない。砂が堆積する汚水処理設備の場所は、汚水等の
受入槽、原水調整槽、沈砂槽、最初沈殿槽、最終沈殿
槽、生物反応槽などの曝気槽、接触酸化水槽、生物膜処
理水槽、前曝気槽、凝集沈殿槽、加圧浮上槽、混合槽、
凝集槽、放流水槽、酸化槽、滅菌水槽などの水槽や配
管、ピット、ポンプ水槽などである。本発明において、
砂が堆積する場所から砂を除去する揚砂工程に用いる吸
引装置は、水中ポンプ、モーノポンプ、チュウブポンプ
などの容積型ポンプ、空気エジェクター、水エジェクタ
ー、サンドポンプ、真空ポンプなどがいずれも使用でき
る。[0008] Sand is a water-insoluble inorganic substance having a specific gravity of 2 or more and a particle size of 3 mm or less. The sand includes metal oxides and metal particles in addition to natural sand. There is no limitation on the content of sand, and there is no limitation on the amount of sand deposited or the ratio of sand to other solids. The location of the wastewater treatment facility where sand accumulates is as follows: wastewater receiving tank, raw water conditioning tank, sand setting tank, first settling tank, final settling tank, aeration tank such as biological reaction tank, contact oxidation water tank, biofilm treatment water tank, front Aeration tank, coagulation sedimentation tank, pressure flotation tank, mixing tank,
Examples include water tanks such as flocculation tanks, discharged water tanks, oxidation tanks, sterilized water tanks, pipes, pits, and pump water tanks. In the present invention,
As the suction device used in the sand lifting process for removing sand from the place where the sand is accumulated, a submersible pump, a mohno pump, a positive displacement pump such as a tube pump, an air ejector, a water ejector, a sand pump, or a vacuum pump can be used.

【０００９】スクリーンは、ウエッジワイヤーやバース
スクリーンなどの市販のものが使用できる。その目開き
には制限が無いが、実用的な目開きは０．５〜５ｍｍで
ある。スクリーンから分離された砂を含む固形物を脱水
する場合には、市販の脱水機が使用できる。それらは、
ベルトプレス型やスクリュープレス型、遠心分離、フィ
ルタープレス型がいずれも使用できる。図１に示すよう
に、汚水処理槽底部の砂の層に、例えば水中ポンプを降
ろして、直接、汚水処理槽内の液と共に砂を除去する。
砂を含む工程水は、スクリーンにより砂と分離液とに分
離される。分離液は次工程に移送される。分離された砂
は、固形物を含むので処分し易いように脱水される。脱
水後は、衛生的な取り扱いができるように、焼却処分す
るのが良い。スクリーン分離物を脱水焼却することによ
り、衛生的な処理が可能で、減容化できて最終処分量が
減る。A commercially available screen such as a wedge wire or a bar screen can be used as the screen. There is no limitation on the opening, but the practical opening is 0.5 to 5 mm. A commercially available dehydrator can be used to dehydrate the solid substance containing sand separated from the screen. They are,
Any of a belt press type, a screw press type, a centrifugal separation type, and a filter press type can be used. As shown in FIG. 1, for example, an underwater pump is lowered onto the sand layer at the bottom of the sewage treatment tank to directly remove the sand together with the liquid in the sewage treatment tank.
The process water containing sand is separated by a screen into sand and a separation liquid. The separated liquid is transferred to the next step. The separated sand, which contains solids, is dehydrated for easy disposal. After dehydration, it is better to incinerate it for hygienic handling. By dehydrating and incinerating the screen separation material, hygienic treatment is possible and the volume can be reduced to reduce the final disposal amount.

【００１０】次に、図２の本発明の汚水処理槽底部から
の砂を含む工程水に繊維を添加して、その繊維に砂を捕
捉させて、スクリーンで工程水から砂を分離する除去方
法について説明する。この方法では、工程水に繊維を添
加して、砂を繊維に強固に捕捉させてスクリーンで分離
する。砂を繊維に強固に捕捉させることにより、スクリ
ーンから砂が分離液にリークするのを防止することがで
きるので、砂除去性能が繊維の添加により向上する。繊
維の添加場所は、スクリーンヘの配管途中や図２の中継
水槽内でもよい。本発明で用いる繊維は、人造繊維、化
学繊維、木綿などの天然繊維、パルプなどの木質繊維、
植物遺体のピートモスなど、すべでの繊維や故紙などの
繊維含有物が使用できる。再生繊維も使用でき、それら
は化学繊維製造工程から廃棄されるポリエステル繊維や
ポリプロピレン繊維、アクリロニトリル繊維あるいはＰ
ＥＴボトルから得られるポリエステル再生繊維等であ
る。Next, a removal method in which fibers are added to the process water containing sand from the bottom of the sewage treatment tank of the present invention shown in FIG. 2 to cause the fibers to capture the sand and separate the sand from the process water with a screen. Will be described. In this method, fibers are added to process water so that sand is firmly captured by the fibers and separated by a screen. By tightly capturing the sand in the fibers, it is possible to prevent the sand from leaking from the screen to the separation liquid, and thus the sand removal performance is improved by adding the fibers. The fiber may be added in the middle of piping to the screen or in the relay water tank of FIG. Fibers used in the present invention, artificial fibers, chemical fibers, natural fibers such as cotton, wood fibers such as pulp,
All fibers such as peat moss of plant remains and fiber-containing materials such as waste paper can be used. Regenerated fibers can also be used, such as polyester fibers, polypropylene fibers, acrylonitrile fibers or P that are discarded from the chemical fiber manufacturing process.
Examples include recycled polyester fibers obtained from ET bottles.

【００１１】繊維の形状は、太さが数μｍ〜１ｍｍ、長
さが０．１ｍｍ〜数ｃｍであるが、特に制限はない。各
種繊維の混合物を使用しても良い。市販されている化学
合成繊維を本発明に使う場合には、その太さは数〜数十
μｍが砂を捕捉し易いので好適である。また、その長さ
も、スラリ状にしたときの作業性やスクリーンでの分離
性能を考慮すると、数ｍｍ〜１ｃｍが好適である。繊維
の添加率は、砂を含む工程水あたり０．０１〜３％であ
る。添加率が０．０１％未満では、砂の分離性能が得ら
れない。また、添加率が３％を超えると、砂は繊維に捕
捉されるが、砂を捕捉した繊維が塊状になり、移送等の
ハンドリングが困難になる。The fiber has a thickness of several μm to 1 mm and a length of 0.1 mm to several cm, but is not particularly limited. A mixture of various fibers may be used. When a commercially available chemically synthesized fiber is used in the present invention, a thickness of several to several tens of μm is suitable because sand can be easily captured. In addition, the length is preferably several mm to 1 cm in consideration of workability when made into a slurry shape and separation performance on a screen. The fiber addition rate is 0.01 to 3% per process water containing sand. If the addition rate is less than 0.01%, the sand separation performance cannot be obtained. Further, if the addition rate exceeds 3%, the sand will be captured by the fibers, but the fibers that have captured the sand will become lumps, making handling such as transfer difficult.

【００１２】繊維と工程水を混合する装置は、撹拌機な
どの機械撹拌や空気撹拌装置、ラインミキサーも使用で
きるが、図２に示す中継水槽に設けた撹拌機などの機械
撹拌装置が望ましい。中継水槽に堆積した砂は、水が加
えられた工程水に繊維を添加して、再度スクリーンによ
り分離する。繊維は、工業用水や汚水処理施設で容易に
得られる処理水や汚水で、繊維をスラリー状にしてから
工程水に添加することもできる。工程水への添加方法
は、繊維の形状を製造工程で均一にできるために、市販
の定量ポンプなどが使用できる。また、人手による散布
や添加もできる。As an apparatus for mixing fibers and process water, a mechanical stirrer such as a stirrer, an air stirrer, or a line mixer can be used, but a mechanical stirrer such as a stirrer provided in the relay water tank shown in FIG. 2 is preferable. The sand accumulated in the relay water tank is separated by the screen again by adding fibers to the process water containing water. The fiber is treated water or sewage easily obtained in industrial water or a sewage treatment facility, and the fiber can be added to the process water after being slurried. As a method for adding to process water, a commercially available metering pump or the like can be used because the shape of the fiber can be made uniform in the manufacturing process. It can also be applied or added manually.

【００１３】また、図３を用いて、本発明の汚水から有
機物を生物学的に分解除去する生物反応槽において、そ
の水槽底部に堆積する砂を除去する揚砂工程と、砂を含
む活性汚泥混合液に繊維を添加してスクリーン分離する
工程と、分離された活性汚泥混合液を前記の生物反応槽
に返送する砂の除去方法について説明する。この方法で
は、工程水から砂だけを取り出して、工程水に残る活性
汚泥は生物反応槽に返送する。生物反応槽から砂除去作
業を行っても、生物反応槽の活性汚泥濃度であるＭＬＳ
Ｓ濃度が維持できて、生物処理に何ら支障をきたさな
い。特に、生物処理設備の砂除去においては、生物反応
を継続させることが重要で、生物処理を中断すると、そ
の中断時間によるが再立ち上げに多大な時間が必要であ
る。図３のように、生物反応槽底部に砂がなくなるま
で、生物反応槽から工程水を取り出した後、スクリーン
で砂を分離する。分離液には、生物処理の継続に必要な
活性汚泥が多量に含まれるので、これを生物反応槽に返
送し、生物反応槽の活性汚泥、ＭＬＳＳ濃度を維持す
る。Further, referring to FIG. 3, in a biological reaction tank for biologically decomposing and removing organic matter from wastewater of the present invention, a sand lifting step for removing sand accumulated at the bottom of the water tank, and activated sludge containing sand. A step of adding fibers to the mixed solution and performing screen separation, and a method of removing sand for returning the separated activated sludge mixed solution to the biological reaction tank will be described. In this method, only sand is removed from the process water and the activated sludge remaining in the process water is returned to the biological reaction tank. Even if sand removal work is performed from the biological reaction tank, the MLS that is the activated sludge concentration of the biological reaction tank
The S concentration can be maintained and does not interfere with biological treatment. In particular, in sand removal of biological treatment equipment, it is important to continue biological reaction, and if biological treatment is interrupted, it takes a long time for restarting depending on the interruption time. As shown in FIG. 3, after removing process water from the biological reaction tank until the bottom of the biological reaction tank is free of sand, the sand is separated by a screen. Since the separated liquid contains a large amount of activated sludge necessary for continuing biological treatment, this is returned to the biological reaction tank to maintain the activated sludge and MLSS concentrations in the biological reaction tank.

【００１４】また、本発明は、汚水処理工程又は生物反
応槽底部に堆積する砂を除去する吸引装置と、砂分離用
スクリーンからなる砂の除去装置である。砂分離用スク
リーンの前に、繊維を添加する水槽や混合用配管を具備
することもできる。揚砂するための吸引装置は、水槽底
部の堆積した砂や汚泥を水槽外に吸引できるように、水
平方向に自由に移動できる吸引口と、吸引口が接続され
たモーノポンプ、エジェクター、真空ポンプで構成され
る。砂分離用スクリーンは、目開き０．５〜５ｍｍで、
ドラムスクリーンが好適である。目開きは、０．５ｍｍ
未満では、目詰まりのために砂分離が困難になる。目開
きが５ｍｍを超えると、スクリーンから砂がリークする
可能性が高い。Further, the present invention is a sand removing device comprising a suction device for removing sand accumulated in the sewage treatment process or the bottom of the biological reaction tank, and a sand separating screen. A water tank for adding fibers and a mixing pipe may be provided in front of the sand separating screen. The suction device for lifting sand is a suction port that can move freely in the horizontal direction so that the sand and sludge accumulated at the bottom of the water tank can be sucked out of the water tank, and a mono pump, ejector, and vacuum pump to which the suction port is connected. Composed. The screen for sand separation has an opening of 0.5-5 mm,
A drum screen is preferred. Opening is 0.5 mm
Below, sand separation becomes difficult due to clogging. If the opening is more than 5 mm, there is a high possibility that sand will leak from the screen.

【００１５】[0015]

【実施例】以下に、本発明を実施例で具体的に説明する
が、本発明はこれらに限定されるものでない。 実施例１ 底面積１ｍ2の水槽に、ＭＬＳＳが１％、ＶＳＳ／ＳＳ
が８０％の下水処理場の余剰汚泥１ｍ3と、有効径が
０．３ｍｍ、均等係数が１．５の砂２０ｋｇを添加混合
後に、静置させて砂を沈めた。この砂をモーノポンプで
水槽底部から１０リットル／分で吸引し、機械式撹拌機
を設けた中継水槽に、約２００リットルの非処理液を受
け入れた。非処理液の性状は、ＳＳ３．５％、砂１００
ｇ／ｌであった。処理量５〜１５リットル／分で、目開
き１ｍｍのドラムスクリーンに通して砂を分離した。ス
クリーン分離液の砂濃度と活性汚泥に相当するＶＳＳ濃
度を測定して、砂とＶＳＳの除去率を求めた。EXAMPLES The present invention will be specifically described below with reference to examples, but the present invention is not limited thereto. Example 1 A water tank having a bottom area of 1 m 2 contains 1% MLSS and VSS / SS.
Was added and mixed with 1 m 3 of excess sludge of 80% sewage treatment plant and 20 kg of sand having an effective diameter of 0.3 mm and a uniformity coefficient of 1.5, and allowed to stand to sink the sand. This sand was sucked from the bottom of the water tank with a mono pump at 10 liters / minute, and about 200 liters of the untreated liquid was received in a relay water tank equipped with a mechanical stirrer. The properties of the non-treatment liquid are SS 3.5%, sand 100
It was g / l. The sand was separated by passing through a drum screen having a 1 mm opening at a throughput of 5 to 15 liters / minute. The sand concentration of the screen separation liquid and the VSS concentration corresponding to the activated sludge were measured to determine the removal rate of sand and VSS.

【００１６】表１に実施例１の結果を示す。砂の分離性
能が良好であった。Table 1 shows the results of Example 1. The sand separation performance was good.

【表１】 [Table 1]

【００１７】実施例２ 実施例１の機械式撹拌機を設けた中継水槽の非処理液
に、長さ１０ｍｍ〜１５ｍｍ、太さ約１０μｍのＰＥＴ
再生繊維や新聞故紙、繊維長さが５ｍｍ程度のピートモ
ス（カナダ産）を、所定量添加混合した後に、スクリー
ンに供給して実施例１と同様に実験した。表２に実施例
２の結果を示す。繊維を添加することにより、砂の除去
率が大きく向上した。Example 2 PET of 10 mm to 15 mm in length and about 10 μm in thickness was added to the untreated liquid in the relay water tank provided with the mechanical stirrer of Example 1.
A regenerated fiber, a newspaper waste paper, and a peat moss (made in Canada) having a fiber length of about 5 mm were added and mixed in a predetermined amount, and then supplied to a screen, and an experiment was performed in the same manner as in Example 1. Table 2 shows the results of Example 2. The sand removal rate was greatly improved by adding the fiber.

【００１８】[0018]

【表２】 [Table 2]

【００１９】実施例３ ＢＯＤ３００ｍｇ／ｌ、ＳＳ１００ｍｇ／ｌの模擬下水
を、有効容量１ｍ3、ＭＬＳＳ５０００ｍｇ／ｌの活性
汚泥混合液を有する生物反応槽（底面積が１ｍ 2）で、
処理量５ｍ3／日で連続的に活性汚泥処理を行った。生
物反応槽に実施例１の砂を５０ｋｇ添加した。モーノポ
ンプで生物反応槽の砂を含む被処理液を、連続的に処理
量１０リットル／分で１５分間吸引して、生物反応槽の
砂を除去した。被処理液をそのまま実施例１のドラムス
クリーンに通して、被処理液から砂を分離した。スクリ
ーンで分離された活性汚泥混合液は、生物反応槽に返送
した。スクリーン分離前に実施例２の繊維を添加した。
生物反応槽への砂の添加を、２日に１回の頻度で１ヶ月
間行っても、生物反応槽でのＢＯＤ除去率は９７％以上
で、生物反応槽のＭＬＳＳ濃度も４５００〜５２００ｍ
ｇ／ｌで推移し生物処理は良好であった。表３に実施例
３の結果を示す。Example 3 Simulated sewage with BOD 300 mg / l and SS 100 mg / l
An effective capacity of 1 m3, MLSS 5000 mg / l activity
Biological reaction tank with sludge mixture (bottom area is 1m 2)so,
Throughput 5m3The activated sludge treatment was continuously performed every day. Raw
50 kg of the sand of Example 1 was added to the product reaction tank. Monopo
To continuously treat the liquid containing sand in the biological reaction tank
Suction for 15 minutes at a volume of 10 liters / minute, and
The sand was removed. The liquid to be treated is used as it is in the drums of Example 1.
The sand was separated from the liquid to be treated by passing through a clean. Screen
The activated sludge mixture liquid separated by the blast is returned to the biological reaction tank.
did. The fiber of Example 2 was added prior to screen separation.
Add sand to the bioreactor once every two days for one month
BOD removal rate in the bioreactor is 97% or more
And the MLSS concentration of the biological reaction tank is also 4500-5200m
The biotreatment was good with the change in g / l. Examples in Table 3
The result of 3 is shown.

【００２０】[0020]

【表３】 [Table 3]

【００２１】[0021]

【発明の効果】本発明は、以下の効果を有する。 （１）簡便な方法で効率よく砂の除去が可能である。 （２）汚水処理設備の運転を停止することなく砂の除去
ができる。 （３）砂を除去することにより、設備や配管の摩耗や閉
塞が防止でき、水槽の有効容量が増加したり、撹拌効果
や空気酸化、曝気効果が高まり、汚水処理性能が向上す
る。 （４）スクリーン分離物を脱水焼却することにより、衛
生的な処理が可能で、減容化できる。The present invention has the following effects. (1) Sand can be removed efficiently by a simple method. (2) Sand can be removed without stopping the operation of sewage treatment equipment. (3) By removing sand, the wear and clogging of equipment and pipes can be prevented, the effective capacity of the water tank is increased, and the stirring effect, air oxidation, and aeration effect are enhanced, and the wastewater treatment performance is improved. (4) By dehydrating and incinerating the screen separation product, hygienic treatment is possible and the volume can be reduced.

【図面の簡単な説明】[Brief description of drawings]

【図１】本発明の砂の除去方法を実施するための一例を
示すフロー工程図。FIG. 1 is a flow process chart showing an example for carrying out a sand removing method of the present invention.

【図２】本発明の砂の除去方法を実施するための他の例
を示すフロー工程図。FIG. 2 is a flow chart showing another example for carrying out the sand removing method of the present invention.

【図３】本発明の砂の除去方法を実施するための別の例
を示すフロー工程図。FIG. 3 is a flow chart showing another example for carrying out the sand removing method of the present invention.

───────────────────────────────────────────────────── フロントページの続き (72)発明者 関 一 東京都大田区羽田旭町11番１号 株式会社 荏原製作所内 (72)発明者 佐藤 一夫 東京都大田区羽田旭町11番１号 株式会社 荏原製作所内 Ｆターム(参考） 4D028 BD00 4D041 AB08 AB09 AD16    ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Sekiichi             11-1 Haneda Asahi-cho, Ota-ku, Tokyo Co., Ltd.             Inside the EBARA CORPORATION (72) Inventor Kazuo Sato             11-1 Haneda Asahi-cho, Ota-ku, Tokyo Co., Ltd.             Inside the EBARA CORPORATION F-term (reference) 4D028 BD00                 4D041 AB08 AB09 AD16

Claims (5)

【特許請求の範囲】[Claims] 【請求項１】 汚水処理設備内の水槽に堆積した砂を、
該設備の運転を中断することなく除去する揚砂工程と、
揚砂工程からの砂を含む工程水を、スクリーンを通して
砂を分離するスクリーン分離工程からなることを特徴と
する砂の除去方法。1. The sand accumulated in the water tank in the sewage treatment facility,
A sand lifting process for removing without interruption of the operation of the equipment,
A method for removing sand, which comprises a screen separation step of separating the process water containing sand from the sand lifting step through a screen. 【請求項２】 前記スクリーン分離工程での砂の分離
は、揚砂工程からの砂を含む工程水に繊維を添加して、
その繊維に砂を捕捉させて行うことを特徴とする請求項
１記載の砂の除去方法。2. The separation of sand in the screen separation step is performed by adding fibers to the step water containing sand from the sand lifting step,
The method for removing sand according to claim 1, wherein the fiber is used to capture the sand. 【請求項３】 前記汚水処理設備内の水槽が、汚水の有
機物を生物学的に分解除去する生物反応槽であり、前記
スクリーン分離工程で分離された分離液の活性汚泥混合
液を前記の生物反応槽に返送することを特徴とする請求
項１又は２記載の砂の除去方法。3. The water tank in the sewage treatment facility is a biological reaction tank for biologically decomposing and removing organic matter of sewage, and the activated sludge mixed solution of the separated liquid separated in the screen separation step is used as the biological material. The method for removing sand according to claim 1 or 2, wherein the sand is returned to the reaction tank. 【請求項４】 汚水処理設備内の水槽に堆積する砂を、
該設備の運転中に吸引除去する吸引装置と、吸引除去し
た砂を含む水から砂を分離する砂分離用スクリーンから
なることを特徴とする砂の除去装置。4. The sand deposited in the water tank in the sewage treatment facility,
A sand removing device comprising: a suction device for removing by suction while the equipment is in operation, and a sand separating screen for separating sand from water containing the removed sand. 【請求項５】 前記吸引除去した砂を含む水に、繊維を
添加する添加手段を有することを特徴とする請求項４記
載の砂の除去装置。5. The sand removing apparatus according to claim 4, further comprising adding means for adding fibers to the water containing the sand removed by suction.
JP2001279402A 2001-09-14 2001-09-14 Method and apparatus for removing sand in dirty water treating equipment Withdrawn JP2003080009A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2001279402A JP2003080009A (en) 2001-09-14 2001-09-14 Method and apparatus for removing sand in dirty water treating equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2001279402A JP2003080009A (en) 2001-09-14 2001-09-14 Method and apparatus for removing sand in dirty water treating equipment

Publications (1)

Publication Number Publication Date
JP2003080009A true JP2003080009A (en) 2003-03-18

Family

ID=19103598

Family Applications (1)

Application Number Title Priority Date Filing Date
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Country Link
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