JP2003062481A - Treatment method of sand-containing deposited sludge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for efficiently treating sand-containing deposited sludge deposited in the bottom part of a water tank in wastewater treatment facilities. SOLUTION: In the treatment method of sand-containing deposited sludge in the bottom part of a water tank of water treatment facilities or sludge treatment facilities, the deposited sludge is discharged by a cleaning liquid and the resulting cleaning liquid is mixed with fibers and separated into a sand- containing deposited sludge and fiber-containing separated matter by a screen. Alternatively, after the deposited sludge is cleaned by a cleaning liquid, water and fibers are added to sand still deposited in the water tank so as to suppress the sand concentration to 200 g/l or lower and then the cleaning liquid containing sand is transported out the bottom part of the water tank and after that, separated matter containing sand and fibers is separated by a screen. The foregoing separated matter separated by the screen can be dewatered by a screw press and the foregoing fibers to be added can be added while being wrapped with a water-soluble plastic film.

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、砂を含む堆積汚泥
の処理方法に係り、特に、下水、し尿、産業排水を浄化
するための処理設備、脱水などの汚泥処理設備の水槽な
どの底部や生物処理工程の生物反応槽の底部に堆積した
汚泥又は砂を含む汚泥を除去する処理方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for treating sedimented sludge containing sand, and more particularly, to a bottom of a water tank of a sludge treatment facility such as a treatment facility for purifying sewage, night soil, industrial wastewater, and dehydration. The present invention relates to a treatment method for removing sludge or sand-containing sludge accumulated on the bottom of a biological reaction tank in a biological treatment process.

【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、処理設備の外部から風などによって設備内に持ち
込まれる砂や、汚水中の堆積し易い汚泥が、これらを処
理する設備の水槽底部に堆積する。これらの砂や汚泥
が、時間の経過により圧密された状態で水槽底部に堆積
して堆積汚泥になる。設備に堆積した堆積汚泥は、汚水
や汚泥などの移送ポンプなどの機器類の摩耗や閉塞の原
因となる。また、生物反応槽に堆積汚泥が溜まると、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、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。汚泥処理におい
ても、濃縮槽などの底部の砂を含む堆積汚泥を脱水する
脱水機の摩耗や閉塞の重大な問題になる。また、堆積汚
泥の腐敗による悪臭の発生原因になる。2. Description of the Related Art Sand contained in wastewater such as sewage, night soil, industrial wastewater, sand brought into the equipment by wind from the outside of the treatment equipment, and sludge that easily accumulates in the wastewater are treated in the equipment. Deposit on the bottom of the aquarium. These sands and sludges are accumulated on the bottom of the aquarium in the state of being compacted over time to become accumulated sludges. The accumulated sludge accumulated in the equipment causes wear and clogging of devices such as transfer pumps for sewage and sludge. Further, when the accumulated sludge 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, the aeration air pipe provided at the bottom of the water tank is closed, and air cannot be supplied to the biological reaction tank, which makes biological treatment difficult. Also in sludge treatment, there is a serious problem of wear and blockage of a dehydrator that dehydrates accumulated sludge containing sand at the bottom such as a thickening tank. It also causes a bad odor due to the decay of the accumulated sludge.

【０００３】従来、堆積汚泥の除去には、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、水と共に水槽から堆積汚泥を排出する。これら清
掃作業は、主に人手作業が中心である。従来技術による
水槽を清掃する際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、砂や砂以外で沈みにくい汚泥を含む上澄み液を、汚
水処理設備で処理される。このような従来方法は、清掃
液処理において、以下のような問題点があった。 （１）堆積汚泥の砂を除去する有効な方法がなかった。 （２）特に、水槽底部の砂が主成分の堆積汚泥は、多量
の水を使用して砂を集めて多量の水と共に水槽の外に搬
出する従来法では、砂を搬出する作業に時間を要した
り、使用した水が排水になり、その処理に多くの労力が
必要であった。 （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。また、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）砂を含む堆積汚泥を遠心分離機で分離しようとす
ると、摩耗が問題である。[0003] Conventionally, to remove the accumulated sludge, the water in the water tank is discharged, and the accumulated sludge is discharged from the water tank together with the water by a vacuum car or a damper car equipped with a suction device. These cleaning operations are mainly manual work. The cleaning liquid discharged when cleaning the water tank according to the conventional technology is disposed of as industrial waste, or the cleaning liquid is received in a temporary water tank, and the supernatant liquid containing sand or sludge that does not sink easily is treated as wastewater. Processed at the facility. Such a conventional method has the following problems in cleaning liquid treatment. (1) There was no effective method for removing sand from accumulated sludge. (2) Especially, for the sludge mainly composed of sand at the bottom of the water tank, in the conventional method in which a large amount of water is used to collect the sand and carry it out of the water tank together with a large amount of water, it takes time to carry out the sand. It took a lot of labor to treat the wastewater. (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. In addition, sand leaks into the treated water and accumulates again in the wastewater treatment facility. (4) Abrasion is a problem when trying to separate sedimented sludge containing sand with a centrifuge.

【０００４】[0004]

【発明が解決しようとする課題】本発明は、上記従来技
術の問題点を解消し、汚水処理設備の水槽底部に堆積し
た砂を含む堆積汚泥を効果的に処理する方法を提供する
ことを課題とする。SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems of the prior art and to provide a method for effectively treating accumulated sludge containing sand accumulated at the bottom of a water tank of a wastewater treatment facility. And

【０００５】[0005]

【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、水処理設備又は汚泥処理設備の水槽底
部の砂を含む堆積汚泥の処理方法において、前記堆積汚
泥を清掃液で排出し、得られる清掃液に繊維を添加し
て、スクリーンで砂を含む堆積汚泥と繊維を含む分離物
を分離することとしたものである。また、本発明では、
水処理設備又は汚泥処理設備の水槽底部の砂を含む堆積
汚泥の処理方法において、前記堆積汚泥を清掃液で清掃
した後に、依然水槽内に堆積する砂に対して、砂濃度が
２００ｇ／ｌ以下になるように水と繊維を添加して、水
槽底部から砂を含む清掃液を搬出した後に、スクリーン
で砂と繊維を含む分離物を分離することこととしたもの
である。前記処理方法において、スクリーンで分離した
分離物は、スクリュープレスにより脱水することがで
き、また、前記添加する繊維は、水溶性プラスチックフ
ィルムに包装して添加することができる。In order to solve the above problems, in the present invention, in a method for treating sedimentary sludge containing sand at the bottom of a water tank of a water treatment facility or a sludge treatment facility, the accumulated sludge is discharged as a cleaning liquid. Then, fibers are added to the obtained cleaning liquid, and the sludge containing sand and the separated substance containing fibers are separated by a screen. Further, in the present invention,
In a method of treating sedimentary sludge containing sand at the bottom of a water tank of a water treatment facility or a sludge treatment facility, the sand concentration is 200 g / l or less with respect to the sand still accumulated in the water tank after cleaning the accumulated sludge with a cleaning liquid. As described above, water and fibers are added so that the cleaning liquid containing sand is carried out from the bottom of the water tank, and then the separated product containing sand and fibers is separated by a screen. In the treatment method, the separated substance separated by the screen can be dehydrated by a screw press, and the fiber to be added can be added after being packaged in a water-soluble plastic film.

【０００６】[0006]

【発明の実施の形態】本発明は、水槽底部の砂を含む堆
積汚泥を清掃した清掃液に繊維を添加して、スクリーン
で分離し、分離液は水処理工程で別途処理し、スクリー
ンからの砂を含む堆積汚泥と繊維を含む分離物を得、該
分離物はスクリュープレスにより脱水する処理方法であ
る。本発明の堆積汚泥の処理方法の概略構成図を図１に
示す。図１に示すように、水槽底部の堆積汚泥層に、例
えば水中ポンプを降ろして、直接水槽内の液と共に堆積
汚泥を除去する。又は、手作業により水槽底部の堆積汚
泥を集めて、水槽から清掃液として水槽の外に排出させ
る。清掃液は、スクリーンにより砂や汚泥と分離液に分
離される。分離液は、次工程に移送される。スクリーン
分離物は、処分し易いように脱水される。繊維は、直接
堆積汚泥のある水槽に添加しても、中継水槽に添加して
も良い。また両方に添加しても良い。BEST MODE FOR CARRYING OUT THE INVENTION According to the present invention, fibers are added to a cleaning liquid for cleaning sedimented sludge containing sand at the bottom of an aquarium and separated by a screen, and the separated liquid is separately treated in a water treatment process. This is a processing method in which a sediment containing sludge containing sand and a fiber-containing separated product are obtained, and the separated product is dehydrated by a screw press. FIG. 1 shows a schematic configuration diagram of the method for treating accumulated sludge of the present invention. As shown in FIG. 1, for example, an underwater pump is lowered on the accumulated sludge layer at the bottom of the water tank to directly remove the accumulated sludge together with the liquid in the water tank. Alternatively, the accumulated sludge at the bottom of the water tank is manually collected and discharged from the water tank as a cleaning liquid to the outside of the water tank. The cleaning liquid is separated by a screen into sand and sludge and a separation liquid. The separated liquid is transferred to the next step. The screen isolate is dehydrated for easy disposal. The fibers may be added directly to the water tank containing the accumulated sludge or added to the relay water tank. It may be added to both.

【０００７】本発明の砂を含む堆積汚泥としては、下
水、し尿、浄化槽汚泥、液状産業廃棄物、埋め立て処分
場浸出水、産業排水等の汚泥処理や、汚水処理設備の水
槽等の底部に堆積する汚泥である。清掃液は、水槽底部
の砂を除去する際に排出されるもので、固形物としては
多量の砂と有機性汚泥又は無機性汚泥を含む液である。
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。有機性
汚泥は、余剰汚泥、有機性液状廃棄物、浄化槽汚泥など
が長期間堆積したものである。無機性汚泥は、金属粉
末、金属水酸化物、金属の炭酸塩やリン酸塩、硫化物、
鉱物、粘土鉱物などが長期間堆積したものである。The sediment-containing sludge of the present invention includes sewage, night soil, septic tank sludge, liquid industrial waste, landfill landfill leachate, industrial wastewater, and other sludge treatment, and is deposited on the bottom of a water tank of a wastewater treatment facility. It is sludge that does. The cleaning liquid is discharged when removing sand at the bottom of the water tank, and is a liquid containing a large amount of sand and organic sludge or inorganic sludge as solid matter.
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 contains 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 organic sludge is a long-term deposit of excess sludge, organic liquid waste, septic tank sludge, and the like. Inorganic sludge includes metal powders, metal hydroxides, metal carbonates and phosphates, sulfides,
It is a long-term deposit of minerals and clay minerals.

【０００８】堆積汚泥が発生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、汚
泥の受入槽や汚泥濃縮槽、汚泥貯留槽などの水槽や配
管、ピット、ポンプ水槽などである。堆積汚泥が堆積す
る場所から堆積汚泥を除去する方法は、水中ポンプ、モ
ーノポンプ、チュー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
ンプなどいずれも使用できる。The location of the wastewater treatment facility where the accumulated sludge is generated is a tank for receiving wastewater, a raw water adjusting tank, a sand settling tank, a first settling tank, a final settling tank, an aeration tank such as a biological reaction tank, a contact oxidation water tank, and a biofilm. Treated water tank, pre-aeration tank, coagulation sedimentation tank, pressure flotation tank, mixing tank, coagulation tank, discharge water tank, oxidation tank, sterilization water tank, sludge receiving tank, sludge concentrating tank, sludge storage tank, etc. , Pump water tanks. As a method for removing the accumulated sludge from the place where the accumulated sludge is accumulated, any of a submersible pump, a positive displacement pump such as a mono pump, a tube pump, an air ejector, a water ejector, a sand pump, and 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。目開き０．５ｍｍ未満では、スクリーンの分離性能
が低下する。５ｍｍを越えるとスクリーン分離液にＳＳ
や砂がリークする。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、フ
ィルタープレス型いずれも使用できる。このうち、含水
率が下げられるスクリュープレス型脱水機が好適であ
る。清掃液への繊維の添加方法は、人手による添加であ
る。本発明の繊維は、人造繊維、化学繊維、木綿などの
天然繊維、パルプなど木質繊維、植物遺体のピートモス
などすべての繊維や故紙などの繊維含有物が使用でき
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. If the opening is less than 0.5 mm, the separation performance of the screen deteriorates. If it exceeds 5 mm, SS is used as a screen separation liquid.
And sand leaks. A commercially available dehydrator can be used to dehydrate the solid substance containing sand separated from the screen. A belt press type, a screw press type, and a filter press type can be used for them. Of these, a screw press type dehydrator that can reduce the water content is preferable. The method of adding fibers to the cleaning liquid is manual addition. As the fibers of 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 inclusions such as waste paper can be used.

【００１０】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ＰＥＴボトルか
ら得られるポリエステル再生繊維等である。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、砂を含む清掃液
あたり０．０５〜３％である。添加率０．０５％未満で
は、砂の分離性能が得られない。添加率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。Regenerated fibers can also be used, such as polyester fibers, polypropylene fibers, acrylonitrile fibers discarded from the chemical fiber manufacturing process or polyester recycled fibers obtained from PET bottles. The fiber has a thickness of several μm to 1 mm and a length of 0.1 mm to several cm.
However, there is no particular limitation. 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, considering the workability when the length is made into a slurry and the separation performance on the screen, the length is several mm
1 cm is preferred. The addition rate of fibers is 0.05 to 3% per cleaning liquid containing sand. If the addition rate is less than 0.05%, the sand separation performance cannot be obtained. 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.

【００１１】繊維を清掃液と混合する装置は、攪拌機な
どの機械攪拌や空気攪拌装置、ラインミキサーも使用で
きるが、図１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。また、本発明で、堆積汚泥を処分
した後に水槽内に堆積するのは、ほとんどが砂である。
これに、砂濃度が２００ｇ／ｌ以下になるように水と繊
維を添加し、水槽底部から砂を含む清掃液を水槽から搬
出した後にスクリーン分離する。また、中継水槽に残留
する砂が主成分の汚泥に対しても、同様に水と繊維を添
加してスクリーン分離する。As a device for mixing the fibers with the cleaning liquid, a mechanical stirrer such as a stirrer, an air stirrer, or a line mixer can be used, but a mechanical stirrer such as the stirrer provided in the relay water tank shown in FIG. 1 is preferable. Further, in the present invention, most of the deposits in the water tank after disposing of the sludge is sand.
Water and fibers are added to this so that the sand concentration is 200 g / l or less, and the cleaning liquid containing sand is carried out from the bottom of the water tank and then screen-separated. Also, for sludge mainly composed of sand remaining in the relay water tank, water and fibers are similarly added and screen separation is performed.

【００１２】図２に、水槽底部に堆積した砂の搬出と分
離をする処理方法の概略構成図を示す。清掃後に水槽底
部に最後まで残る砂は、それだけでは水槽の外に搬出す
るのは、多量の水を使用しても困難である。この砂に水
と繊維を添加して、繊維に砂を捕捉させると、水中ポン
プなどで水流によって容易に水槽の外に搬出できる。ス
クリーン分離前の砂濃度が２００ｇ／ｌを越えると、繊
維の添加率が増加し、スクリーンの固形物が多くなり、
水切れが低下するので、この砂濃度以下にするのが良
い。しかしながら、スクリーンヘの清掃液の供給量を減
らせるのであれば、この砂濃度には特に制限はない。ま
た、スクリーン分離前の砂濃度が極端に薄くても、本発
明は適用できる。清掃液の砂の割合が高まると、添加す
る繊維を多くするのが良い。本発明の繊維の添加は、水
溶性プラスチックフィルムに繊維を包装した繊維薬剤と
して、水槽内に直接添加することができる。水溶性プラ
スチックフィルム又は水溶性フィルムに繊維を包装した
繊維薬剤を使用することにより、事前計量による使用量
の適正化が図れ、粉塵の防止になり作業環境が維持でき
る。FIG. 2 shows a schematic block diagram of a processing method for carrying out and separating the sand accumulated at the bottom of the water tank. The sand left on the bottom of the water tank after cleaning is difficult to carry out of the water tank by itself even if a large amount of water is used. When water and fibers are added to this sand and the sand is captured by the fibers, it can be easily carried out of the water tank by a water flow using an underwater pump or the like. If the sand concentration before screen separation exceeds 200 g / l, the fiber addition rate increases and the screen solids increase,
It is better to keep the sand concentration below this level, because water drainage will decrease. However, the sand concentration is not particularly limited as long as the amount of cleaning liquid supplied to the screen can be reduced. The present invention can be applied even if the sand concentration before the screen separation is extremely low. As the proportion of sand in the cleaning liquid increases, it is better to add more fibers. The fiber of the present invention can be added directly into the water tank as a fiber medicine in which the fiber is packaged in a water-soluble plastic film. By using a water-soluble plastic film or a fiber medicine in which fibers are packaged in a water-soluble film, the amount used by pre-measurement can be optimized, dust can be prevented, and the work environment can be maintained.

【００１３】該繊維薬剤を計量されて小分けすることに
より、薬剤添加の作業性が向上する。小分けされた薬剤
重量は特に制限はないが、１袋あたり１〜２０ｋｇが実
用的である。水溶性プラスチックフィルムに繊維を包装
した繊維薬剤は、帯状又は袋状にフィルムを成形加工さ
れたものである。本発明の水溶性プラスチックフィルム
は、ＰＶＡを出発原料とするもので、可塑剤にはグリセ
リン又はポリエチレングリコールを使用したもので、冷
水や温水に容易に溶解するものである。本発明において
は、水溶性プラスチックフィルムは、１５０〜２００℃
でヒートシールできて、製袋が容易にできるものが良
い。水溶性プラスチックフィルムに繊維を包装した繊維
薬剤を、清掃対象の水槽や中継水槽に添加する。水槽内
では、水や清掃液により容易に溶解して、繊維が分散す
る。[0013] The fiber drug is weighed and subdivided to improve the workability of adding the drug. The weight of the divided drug is not particularly limited, but 1 to 20 kg per bag is practical. The fiber medicine in which fibers are packaged in a water-soluble plastic film is obtained by forming a film into a band shape or a bag shape. The water-soluble plastic film of the present invention uses PVA as a starting material, uses glycerin or polyethylene glycol as a plasticizer, and is easily dissolved in cold water or hot water. In the present invention, the water-soluble plastic film has a temperature of 150 to 200 ° C.
It is preferable that it can be heat-sealed and can be easily made into bags. A textile chemical in which fibers are wrapped in a water-soluble plastic film is added to a water tank or a relay water tank to be cleaned. In the water tank, it is easily dissolved by water or a cleaning liquid to disperse the fibers.

【００１４】[0014]

【実施例】以下に、本発明を詳細に説明するが、本発明
はこれらに限定されるものでない。 実施例１ し尿処理施設のし尿貯留水槽底部から採取した堆積汚泥
を、水道水で希釈したものを模擬清掃液とし、撹拌機を
設けた水槽に入れて、砂分が沈降しない程度に水槽内を
攪拌した。模擬清掃液は、ＳＳが１５％、ＶＳＳ／ＳＳ
が５０％、砂が７０ｇ／ｌであった。この砂は、有効径
が０．３ｍｍ、均等係数が１．５であった。清掃液に、
長さ１０ｍｍ〜１５ｍｍ、太さ約１０μｍのＰＥＴ再生
繊維や新聞故紙及び繊維長さが５ｍｍ程度のピートモス
（カナダ産）を所定量添加混合した後、処理量５〜１５
リットル／分で目開き１ｍｍのドラムスクリーンで、砂
を含むスクリーン分離物を分離した。スクリーン分離液
の砂濃度と砂を含む汚泥、ＳＳ濃度を測定して、砂とＳ
Ｓの除去率を求めた。The present invention will be described in detail below, but the present invention is not limited thereto. Example 1 The sediment sludge collected from the bottom of the human waste storage water tank of the human waste treatment facility was diluted with tap water to be used as a simulated cleaning liquid, and the water was placed in a water tank equipped with a stirrer. It was stirred. Simulated cleaning liquid is 15% SS, VSS / SS
Was 50% and sand was 70 g / l. This sand had an effective diameter of 0.3 mm and a uniformity coefficient of 1.5. For cleaning liquid,
PET recycled fiber having a length of 10 mm to 15 mm and a thickness of about 10 μm, newspaper waste paper, and peat moss (made in Canada) having a fiber length of about 5 mm are added and mixed in a predetermined amount, and then the treated amount is 5 to 15
The screen separation containing sand was separated with a drum screen having an opening of 1 mm at liter / minute. Measure the sand concentration of the screen separation liquid, the sludge containing sand, and the SS concentration to determine the sand and S
The removal rate of S was calculated.

【００１５】表１に実施例１の結果を示す。砂や汚泥の
分離性能が良好であった。Table 1 shows the results of Example 1. The separation performance of sand and sludge was good.

【表１】 [Table 1]

【００１６】実施例２ 実施例１の模擬清掃液に、新たに有効径０．３ｍｍ、均
等係数１．５の砂を添加して、水槽底部の砂が主成分の
清掃液の処理を想定した。この砂が主成分の清掃液は、
ＳＳが１２〜３３％、ＶＳＳ／ＳＳが１０％以下、砂が
１００〜３００ｇ／ｌであった。砂が主成分の清掃液
を、実施例１の撹拌機を設けた水槽に入れて、実施例１
のＰＥＴ再生繊維を添加して、スクリーン供給量１０リ
ットル／分で実施例１と同様に実験した。ＳＳのほとん
どが砂であるために、スクリーン分離液のＳＳを測定し
て、砂除去率を求めた。表２に実施例２の結果を示す。
砂が主成分の清掃液でも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 To the simulated cleaning liquid of Example 1, sand having an effective diameter of 0.3 mm and a uniform coefficient of 1.5 was newly added to assume the treatment of the cleaning liquid containing sand at the bottom of the water tank as a main component. . This sand-based cleaning solution is
SS was 12 to 33%, VSS / SS was 10% or less, and sand was 100 to 300 g / l. The cleaning liquid containing sand as the main component was placed in the water tank provided with the stirrer of Example 1, and
The same experiment as in Example 1 was carried out by adding the PET recycled fiber of Example 1 and supplying the screen at a rate of 10 l / min. Since most of SS is sand, the SS of the screen separation liquid was measured to obtain the sand removal rate. Table 2 shows the results of Example 2.
Even with a cleaning liquid containing sand as the main component, the removal rate of sand was greatly improved by adding fibers.

【００１７】[0017]

【表２】 [Table 2]

【００１８】実施例３ ＰＶＡを原料にした水溶性プラスチックフィルムに繊維
を包装した繊維薬剤を、実施例１の模擬清掃液に添加し
て、スクリーン供給量１０リットル／分で実施例１と同
様に実験した。実施例１の模擬清掃液１００リットルに
対して、１パック当りに繊維を０．２ｋｇから１ｋｇを
包装した繊維薬剤を各々１個づつ添加するか、１パック
当りに繊維を０．２ｋｇのものを各個数づつ添加した。
表３に実施例３の結果を示す。水溶性プラスチックフィ
ルムに繊維を包装した繊維薬剤は、繊維そのままを添加
した場合と比較して、スクリーン分離効果に差は認めら
れなかった。Example 3 The same procedure as in Example 1 was carried out by adding a fiber chemical in which fibers were wrapped in a water-soluble plastic film made of PVA as a raw material to the simulated cleaning liquid of Example 1 and supplying a screen at a rate of 10 liters / minute. I experimented. To 100 liters of the simulated cleaning liquid of Example 1, one fiber agent each containing 0.2 kg to 1 kg of fiber was added per pack, or 0.2 kg of fiber per pack was added. Each number was added.
Table 3 shows the results of Example 3. No difference was found in the screen separation effect of the fiber medicine in which the fiber was packaged in the water-soluble plastic film, as compared with the case where the fiber itself was added.

【００１９】[0019]

【表３】 [Table 3]

【００２０】[0020]

【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清掃液から砂や汚泥が除去
できる。 （２）水槽底部に最後まで残る砂が、繊維の添加で水槽
の外に容易に搬出できて、砂除去作業の効率化が図れ
る。 （３）スクリーン分離物を脱水焼却することで、堆積汚
泥の減容化が可能で、埋め立て処分量が削減できる。 （４）堆積汚泥の除去により、水槽の有効容量が増加し
て汚水処理や汚泥処理性能が向上する。The present invention has the following effects. (1) Sand and sludge can be efficiently removed from the cleaning liquid by a simple method. (2) The sand remaining at the bottom of the water tank can be easily carried out of the water tank by adding fibers, and the efficiency of sand removal work can be improved. (3) By dewatering and incinerating the screen separation product, the volume of accumulated sludge can be reduced and the amount of landfill disposal can be reduced. (4) By removing the accumulated sludge, the effective capacity of the water tank is increased and the sewage treatment and sludge treatment performance is improved.

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

【図１】本発明の処分方法の一例を示す概略構成図。FIG. 1 is a schematic configuration diagram showing an example of a disposal method of the present invention.

【図２】本発明の処分方法の他の例を示す概略構成図。FIG. 2 is a schematic configuration diagram showing another example of the disposal method of the present invention.

───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.⁷ 識別記号 ＦＩ テーマコート゛(参考） Ｃ０２Ｆ 11/12 (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） 4D019 AA03 BA12 BA13 BB13 DA03 4D059 AA09 BE26 BK05 BK30 CB02 CB03 DB40 EB01 4D071 AA01 AB17 BB12 CA03 DA15─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) C02F 11/12 (72) Inventor Sekiichi 11-11 Haneda-Asahicho, Ota-ku, Tokyo Inside EBARA CORPORATION (72) Inventor Kazuo Sato 11-1 Haneda Asahi-cho, Ota-ku, Tokyo F-term inside EBARA CORPORATION (reference) 4D019 AA03 BA12 BA13 BB13 DA03 4D059 AA09 BE26 BK05 BK30 CB02 CB03 DB40 EB01 4D071 AA01 AB17 BB12 CA03 DA15

Claims (4)

【特許請求の範囲】[Claims] 【請求項１】 水処理設備又は汚泥処理設備の水槽底部
の砂を含む堆積汚泥の処理方法において、前記堆積汚泥
を清掃液で排出し、得られる清掃液に繊維を添加して、
スクリーンで砂を含む堆積汚泥と繊維を含む分離物を分
離することを特徴とする砂を含む堆積汚泥の処理方法。1. A method of treating sedimentary sludge containing sand at the bottom of a water tank of a water treatment facility or a sludge treatment facility, wherein the accumulated sludge is discharged with a cleaning liquid, and fibers are added to the resulting cleaning liquid.
A method for treating a sedimentary sludge containing sand, comprising separating a sedimented sludge containing sand and a separated substance containing fibers with a screen. 【請求項２】 水処理設備又は汚泥処理設備の水槽底部
の砂を含む堆積汚泥の処理方法において、前記堆積汚泥
を清掃液で清掃した後に、依然水槽内に堆積する砂に対
して、砂濃度が２００ｇ／ｌ以下になるように水と繊維
を添加して、水槽底部から砂を含む清掃液を搬出した後
に、スクリーンで砂と繊維を含む分離物を分離すること
を特徴とする砂を含む堆積汚泥の処理方法。2. A method for treating sedimentary sludge containing sand at the bottom of a water tank of a water treatment facility or a sludge treatment facility, wherein the sand concentration of the sand still accumulated in the aquarium after cleaning the accumulated sludge with a cleaning liquid. Water and fibers are added so that the water content is 200 g / l or less, and a cleaning liquid containing sand is carried out from the bottom of the water tank, and then a separation product containing sand and fibers is separated by a screen. Treatment method of accumulated sludge. 【請求項３】 前記スクリーンで分離した分離物は、ス
クリュープレスにより脱水することを特徴とする請求項
１又は２記載の砂を含む堆積汚泥の処理方法。3. The method for treating sedimentary sludge containing sand according to claim 1, wherein the separated substance separated by the screen is dehydrated by a screw press. 【請求項４】 前記添加する繊維は、水溶性プラスチッ
クフィルムに包装して添加すること特徴とする請求項
１、２又は３記載の砂を含む堆積汚泥の処理方法。4. The method for treating sedimented sludge containing sand according to claim 1, 2 or 3, wherein the fibers to be added are packaged in a water-soluble plastic film and added.