JP6689435B2 - Wastewater treatment system and wastewater treatment method - Google Patents

Wastewater treatment system and wastewater treatment method Download PDF

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JP6689435B2
JP6689435B2 JP2019100786A JP2019100786A JP6689435B2 JP 6689435 B2 JP6689435 B2 JP 6689435B2 JP 2019100786 A JP2019100786 A JP 2019100786A JP 2019100786 A JP2019100786 A JP 2019100786A JP 6689435 B2 JP6689435 B2 JP 6689435B2
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進 大矢
進 大矢
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大矢建設工業株式会社
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本発明は、焼却施設解体工事等における汚水や汚染水を処理する排水処理システム及び排水処理方法に関する。   TECHNICAL FIELD The present invention relates to a wastewater treatment system and a wastewater treatment method for treating dirty water and contaminated water in demolition work of an incineration facility.

建築物の改修工事及び焼却施設の解体工事などにより発生する汚水及び/又は汚染水には、ダイオキシン類、重金属、他の有害物質(以下、本願において「ダイオキシン類等」という。)が含まれている。また、断熱材・壁・屋根にはアスベストが使われている場合がある。ダイオキシン類等の除染方法やアスベストの除去方法の一つとして、高圧水噴射装置から高圧水を噴射させて除染・除去する高圧洗浄工法が用いられている。高圧洗浄工法の場合、ダイオキシン類等やアスベストを含む汚水・汚染水の排水処理が必要となる。   The sewage and / or contaminated water generated by the construction work of the building and the demolition work of the incineration facility include dioxins, heavy metals, and other harmful substances (hereinafter referred to as “dioxins, etc.” in the present application). There is. In addition, asbestos may be used for heat insulation materials, walls, and roofs. As one of methods for decontaminating dioxin and the like and for removing asbestos, a high-pressure cleaning method in which high-pressure water is jetted from a high-pressure water jet device to decontaminate and remove is used. In the case of the high-pressure washing method, it is necessary to treat wastewater containing dioxin and asbestos and contaminated water.

例えば、アスベストを含有する汚染水の排水処理については、精密ろ過による排水処理が行われていたが、放流可能な排水基準を満たさないおそれがあった。
また、アスベスト除去作業中にろ過用フィルターが目詰まりすると、ろ過用フィルター交換が必要になることから、アスベスト除去作業を中断しなければならなかった。
For example, regarding the wastewater treatment of contaminated water containing asbestos, although the wastewater treatment by microfiltration has been performed, there is a possibility that the dischargeable wastewater standards may not be satisfied.
Further, if the filtration filter is clogged during the asbestos removal work, it is necessary to replace the filtration filter, so the asbestos removal work had to be interrupted.

現在、アスベストを含有する汚染水の精密ろ過について、ろ過水中のアスベスト繊維濃度を低くすることができる改修乃至解体現場における排水処理ユニットが提供されている(例えば、特許文献1)。   Currently, for microfiltration of contaminated water containing asbestos, there is provided a wastewater treatment unit at a site of improvement or dismantling that can reduce the concentration of asbestos fibers in the filtered water (for example, Patent Document 1).

特許第5031495号Patent No. 5031495

特許文献1の排水処理ユニットは、アスベストを含有する建材を使用した建築物、工作物又は構築物の改修乃至解体をするに先立ち行う水洗工程で発生するアスベスト含有水を排水処理する際に使用するユニットである。排水処理ユニットは、集水手段、粗ろ過手段、及び、精密ろ過手段、並びに、集水手段と粗ろ過手段との間を接続する第一輸送配管、及び、粗ろ過手段と精密ろ過手段との間を接続する第二輸送配管を備え、粗ろ過手段が、ろ過槽本体に、開口面全面に重力ろ過面を形成可能に、ろ材が着脱自在に平置き状態で装着されたものとされ、ろ材が不織布であるものである。これにより、精密ろ過器のろ過用フィルターが目詰まりし難くなることが期待でき、更には、汚水中の粉塵、特に、排水中のアスベスト含有率のさらなる低下が期待できる。   The wastewater treatment unit of Patent Document 1 is a unit used for wastewater treatment of asbestos-containing water generated in a washing step performed before repairing or dismantling a building, a work or a structure using a building material containing asbestos. Is. The wastewater treatment unit includes a water collecting means, a rough filtering means, and a fine filtering means, a first transport pipe connecting the water collecting means and the rough filtering means, and a rough filtering means and a fine filtering means. It is assumed that the coarse filtration means is equipped with a second transportation pipe that connects between the two, and the filter medium is detachably mounted in a flat state in the filtration tank body so that a gravity filtration surface can be formed on the entire opening surface. Is a non-woven fabric. As a result, it can be expected that the filtration filter of the microfilter will be less likely to be clogged, and further, the content of dust in the wastewater, particularly the asbestos content in the wastewater, can be expected to further decrease.

しかし、不織布を用いて解体工事において発生するダイオキシン類等及び/又はアスベストなどを含有する汚水・汚染水を重力ろ過しても、精密ろ過のろ過フィルターが目詰まりする場合があった。従って、不織布を用いた重力ろ過及び精密ろ過を用いる排水処理では、ダイオキシン類等の除染及び/又はアスベストの除去作業を継続して行うことができない場合があった。
また、ダイオキシン類等を含有する汚染水とアスベストを含有する汚染水の排水処理を別々に処理すると、工期が長くなるという問題があった。
However, even if filthy water / contaminated water containing dioxins and / or asbestos generated in dismantling work using a non-woven fabric is gravity filtered, the microfiltration filter may be clogged. Therefore, in the wastewater treatment using gravity filtration and microfiltration using a non-woven fabric, it may not be possible to continue the decontamination work of dioxins and / or the asbestos removal work.
Further, if the contaminated water containing dioxins and the like and the contaminated water containing asbestos are separately treated for drainage, there is a problem that the construction period becomes long.

上述の問題を解決するために、ダイオキシン類等およびアスベストを高圧水で除染・除去する場合において除染・除去作業を中断することなく継続して行うことができる排水処理システム及び排水処理方法を提供することを目的とするものである。   In order to solve the above problems, when decontaminating and removing dioxins and asbestos with high-pressure water, a wastewater treatment system and a wastewater treatment method that can be continuously performed without interruption of the decontamination / removal work. It is intended to be provided.

本発明の排水処理システムは、建物の改修工事及び解体工事により発生する汚水及び/又は汚染水を排水処理するものであって、高圧水噴射装置を用いてダイオキシン類や重金属の除染やアスベスト除去を行う作業場所に、除染・除去により発生する汚水及び/又は汚染水を貯留する汚染水貯留槽と、重力ろ過したろ過水を貯水する原水槽と、凝集沈殿により得られる上澄水を貯水する中継槽と、排水処理された処理水を貯留するとともに、除染・除去作業中は処理水を高圧水噴射装置に供給し、除染・除去作業終了後は高圧水噴射装置への処理水の供給を停止し処理水を放流する処理水貯留槽とを設け、汚染水貯留槽の汚水及び/又は汚染水を不織布を用いて重力ろ過して脱水し汚泥を取り除く脱水装置と、原水槽に貯水される重力ろ過されたろ過水を凝集沈殿させ重金属を含まない上澄水を得る濁水処理装置と、中継槽に貯水される凝集沈殿により得られる上澄水を砂ろ過し上澄水中の浮遊物質を捕捉する砂ろ過装置と、砂ろ過されたろ過水を活性炭ろ過しダイオキシン類を吸着する活性炭ろ過装置と、活性炭ろ過されたろ過水中のアスベスト繊維をろ過フィルターを用いて除去し処理水を生成する精密ろ過装置とを備え、排水処理作業停止時において、処理水貯留槽の処理水を使用して砂ろ過装置や活性炭吸着装置のろ材を逆洗浄するとともに砂ろ過装置や活性炭吸着装置のろ材の逆洗浄により生じる汚濁物を含む水を原水槽に送水することにより排水処理作業中の精密ろ過のろ過フィルターの目詰まりを防止するようにしたものである。 The wastewater treatment system of the present invention is for wastewater treatment of contaminated water and / or contaminated water generated by building renovation work and demolition work , and uses a high-pressure water injection device to decontaminate dioxin and heavy metals and remove asbestos. The contaminated water storage tank that stores the contaminated water and / or contaminated water generated by decontamination / removal, the raw water tank that stores the gravity-filtered filtered water, and the supernatant water that is obtained by coagulation sedimentation are stored in the work place where The relay tank and the treated water that has been drained are stored, and the treated water is supplied to the high-pressure water injection device during decontamination / removal work, and after the decontamination / removal work is completed, the treated water to the high-pressure water injection device A treated water storage tank that stops the supply and discharges the treated water is provided, and a dewatering device that removes sludge by gravity filtering the contaminated water and / or contaminated water in the contaminated water storage tank using a non-woven fabric, and a water storage tank in the raw water tank gravity filtration is to be Was supernatant water and obtained Ru turbid water treatment device on a heavy metal-free filtered water is coagulated precipitate, sand filtration apparatus of the supernatant water obtained by coagulation sedimentation which is water in the relay tank to trap suspended solids supernatant water was sand filtration When the activated carbon filtration device the filtration water is sand filtration to adsorb the activated carbon filtered dioxins, and a microfiltration device for generating treated water was removed using a filtration filter asbestos fibers in the filtered water which has been activated carbon filtration In addition , when the wastewater treatment work is stopped, the treated water in the treated water storage tank is used to back-wash the filter media of the sand filtration device and the activated carbon adsorption device, and the contaminants generated by the back washing of the sand filtration device and the activated carbon adsorption device. it is obtained by the so that to prevent clogging of the filtration filter of microfiltration in wastewater treatment operations by water in the raw water tank water containing.

本発明の排水処理方法は、建物の改修工事及び解体工事により発生する汚水及び/又は汚染水を排水処理する方法であって、高圧水噴射装置を用いてダイオキシン類や重金属の除染やアスベスト除去を行う作業場所に、除染・除去により発生する汚水及び/又は汚染水を貯留する汚染水貯留槽と、重力ろ過したろ過水を貯水する原水槽と、凝集沈殿により得られる上澄水を貯水する中継槽と、排水処理された処理水を貯留するとともに、除染・除去作業中は処理水を高圧水噴射装置に供給し、除染・除去作業終了後は高圧水噴射装置への処理水の供給を停止し処理水を放流する処理水貯留槽とを設け、汚染水貯留槽の汚水及び/又は汚染水を不織布を用いて重力ろ過して脱水し汚泥を取り除く脱水工程と、原水槽に貯水される重力ろ過されたろ過水を凝集沈殿させ重金属を含まない上澄水を得る濁水処理工程と、中継槽に貯水される凝集沈殿により得られる上澄水を砂ろ過装置を用いて砂ろ過し、上澄水中の浮遊物質を捕捉する砂ろ過工程と、砂ろ過されたろ過水を活性炭吸着装置を用いて活性炭ろ過しダイオキシン類を吸着する活性炭ろ過工程と、活性炭ろ過されたろ過水中のアスベスト繊維をろ過フィルターを用いて除去し処理水を生成する精密ろ過工程とを備え、排水処理作業停止時において、処理水貯留槽の処理水を使用して砂ろ過装置や活性炭吸着装置のろ材を逆洗浄するとともに砂ろ過装置や活性炭吸着装置のろ材の逆洗浄に生じる汚濁物を含む水を原水槽に送水することにより排水処理作業中の精密ろ過のろ過フィルターの目詰まりを防止するようにしたものである。 The wastewater treatment method of the present invention is a method for treating wastewater and / or contaminated water generated by building renovation work and demolition work, which uses a high-pressure water jet device to decontaminate dioxins and heavy metals and remove asbestos. The contaminated water storage tank that stores the contaminated water and / or contaminated water generated by decontamination / removal, the raw water tank that stores the gravity-filtered filtered water, and the supernatant water that is obtained by coagulation sedimentation are stored in the work place where The relay tank and the treated water that has been drained are stored, and the treated water is supplied to the high-pressure water injection device during decontamination / removal work, and after the decontamination / removal work is completed, the treated water to the high-pressure water injection device There is a treated water storage tank that stops the supply and discharges the treated water, and a dewatering process that removes sludge by performing gravity filtration of contaminated water and / or contaminated water in a contaminated water storage tank using a nonwoven fabric, and storing water in a raw water tank. was gravity filtered is Supernatant water and resulting Ru turbid water treatment step over without the heavy metal is coagulated precipitated over water, the supernatant water obtained by coagulation sedimentation which is water in the relay bath was sand filtration using a sand filtration apparatus, suspended solids supernatant water a sand filtration step to capture, filtered water that has been sand filter with activated carbon filtration step of adsorbing activated carbon filtration and dioxins using activated carbon adsorption apparatus, a filtration filter asbestos fibers in the filtered water which has been activated carbon filtration It has a microfiltration process to remove and generate treated water, and when the wastewater treatment work is stopped, the treated water in the treated water storage tank is used to back-wash the filter media of the sand filtration device and the activated carbon adsorption device, as well as the sand filtration device. it is obtained so as to prevent clogging of the filtration filter of microfiltration in wastewater treatment operations by water in the raw water tank water containing contaminants occurring backwash of filter media activated carbon adsorber

本発明の排水処理システム及び排水処理方法は、4つのろ過手段及びろ過工程と濁水処理手段及び濁水処理工程を用いて、改修工事及び解体工事により発生する汚水及び/又は汚染水を排水処理するものである。これにより、放流場所の排水基準を満たす処理水を生成できることが期待できる。
また、精密ろ過のろ過フィルターの目詰まりを防ぐことができる。これにより、ダイオキシン類等の除染やアスベスト除去の作業中、精密ろ過された処理水を継続して高圧水噴射機(除染・除去装置)に供給することができる。すなわち、除染・除去作業中は、ろ過用フィルター交換が不要となることから、作業を中断することなく行うことができる。
また、ダイオキシン類等を含有する汚染水とアスベストを含有する汚染水の排水処理を一工程で行うことができることから、工期を短縮することができる。
The wastewater treatment system and wastewater treatment method of the present invention use four filtering means and filtration steps, and muddy water treatment means and muddy water treatment steps to treat wastewater and / or contaminated water generated by repair work and dismantling work. Is. As a result, it can be expected that treated water that meets the drainage standards of the discharge location can be generated.
Further, it is possible to prevent clogging of the filtration filter of the microfiltration. As a result, during the work of decontaminating dioxins and the like and removing asbestos, the microfiltered treated water can be continuously supplied to the high-pressure water jet (decontamination / removal device). That is, during the decontamination / removal work, it is not necessary to replace the filter for filtration, and therefore the work can be performed without interruption.
Moreover, since the wastewater treatment of the contaminated water containing dioxins and the like and the contaminated water containing asbestos can be performed in one step, the construction period can be shortened.

本発明の排水処理システムのブロック図を表わす図である。It is a figure showing the block diagram of the wastewater treatment system of this invention. 本発明の排水処理方法を表わす処理工程フロー図である。It is a treatment process flow chart showing the wastewater treatment method of the present invention.

本発明は、放流場所の排水基準を満たす排水処理を実現するものである。   The present invention realizes wastewater treatment that satisfies the wastewater standards of the discharge place.

本発明の排水処理システム及び排水処理方法を図に基づいて説明する。図1は、本発明の排水処理システムのブロック図を表わす図である。
本発明の排水処理システム10は、建物の改修工事及び解体工事により発生する汚水及び/又は汚染水(以下、「汚染水等」という。)を排水処理するものである。排水処理システム10は、汚染水等を不織布を用いて重力ろ過する重力ろ過手段12と、重力ろ過されたろ過水を凝集沈殿させる濁水処理手段16と、凝集沈殿により得られる上澄水を砂ろ過する砂ろ過手段20と、砂ろ過されたろ過水を活性炭ろ過する活性炭ろ過手段22と、活性炭ろ過されたろ過水を精密ろ過する精密ろ過手段24とを備えるものである。
A wastewater treatment system and a wastewater treatment method of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing a block diagram of a wastewater treatment system of the present invention.
The wastewater treatment system 10 of the present invention treats wastewater and / or contaminated water (hereinafter referred to as “contaminated water, etc.”) generated by repair work and demolition work of a building. The wastewater treatment system 10 includes a gravity filtering unit 12 that gravity filters contaminated water and the like using a non-woven fabric, a turbid water treatment unit 16 that coagulates and filters the gravity-filtered filtered water, and a supernatant water obtained by coagulation and sediment is sand filtered. It is provided with a sand filtering means 20, an activated carbon filtering means 22 for filtering the sand filtered water with activated carbon, and a microfiltration means 24 for microfiltering the activated carbon filtered water.

図1の排水処理システム10において、重力ろ過手段として簡易脱水装置12を備える。簡易脱水装置12(森下化学工業(株)製、袋式重力脱水処理工法「ドリームネット7F」)は、ろ過材として晒し不織布(目付37.5g/m)を用いるものである。不織布でろ過(脱水)されたろ過水は、送水用配管を介して、原水槽14に貯留されるようになっている。また、簡易脱水装置12(不織布で形成された袋)内に汚泥が溜まった場合は、排水処理作業を停止した状態で汚泥が溜まった簡易脱水装置12を取り外し、新しい簡易脱水装置12に交換して排水処理作業を継続する。
なお、取り外した簡易脱水装置12に溜まった汚泥は、所定の時間放置して濃縮し脱水ケーキ15にした後、産業廃棄物として処分する。汚泥を脱水ケーキ15にすることにより、産業廃棄物の量を減らすことができる。
In the wastewater treatment system 10 of FIG. 1, a simple dehydrator 12 is provided as a gravity filtering means. The simple dewatering device 12 (manufactured by Morishita Chemical Co., Ltd., bag type gravity dewatering method “Dream Net 7F”) uses a bleached non-woven fabric (weight per unit area: 37.5 g / m 2 ) as a filtering material. The filtered water that has been filtered (dehydrated) with a non-woven fabric is stored in the raw water tank 14 via a water supply pipe. When sludge is accumulated in the simple dehydrator 12 (a bag made of non-woven fabric), the simple dehydrator 12 in which sludge is accumulated is removed while the wastewater treatment work is stopped, and a new simple dehydrator 12 is replaced. And continue the wastewater treatment work.
The sludge collected in the removed simple dewatering device 12 is left for a predetermined period of time and concentrated to be a dehydrated cake 15, which is then disposed of as industrial waste. By using the sludge as the dehydrated cake 15, the amount of industrial waste can be reduced.

また、濁水処理手段として濁水処理装置16を備える。濁水処理装置16((株)鶴見製作所製、濁水処理装置TDC−0510G)は、反応槽と沈殿槽を有するものである。反応槽には、原水槽14のろ過水に炭酸ガスを吹き込み、苛性ソーダを注入した水溶液が供給されるようになっている。また、反応槽において、反応槽内の水溶液に重金属処理剤と高分子凝集剤が混入されるようになっている。反応槽内の混合液は、沈殿槽にて沈殿汚泥と上澄水に分離される。濁水処理手段(凝集沈殿法)により、重金属を含まない上澄水を得ることができる。上澄水は、送水用配管を介して、中継槽18に貯留されるようになっている。沈殿槽の沈殿汚泥は、排水処理作業を停止した状態で、汚泥用配管を介して、簡易脱水装置12に送り、脱水して脱水ケーキ15とした後、産業廃棄物として処分する。   Further, a turbid water treatment device 16 is provided as turbid water treatment means. The muddy water treatment device 16 (Tsurumi Seisakusho Co., Ltd., muddy water treatment device TDC-0510G) has a reaction tank and a precipitation tank. Carbon dioxide gas is blown into the filtered water of the raw water tank 14 and an aqueous solution in which caustic soda is injected is supplied to the reaction tank. Further, in the reaction tank, the heavy metal treating agent and the polymer coagulant are mixed in the aqueous solution in the reaction tank. The mixed liquid in the reaction tank is separated into settling sludge and supernatant water in the settling tank. By the turbid water treatment means (coagulation sedimentation method), it is possible to obtain supernatant water containing no heavy metal. The supernatant water is stored in the relay tank 18 via a water supply pipe. The sludge settling in the settling tank is sent to the simple dehydrator 12 through the sludge pipe in a state where the wastewater treatment work is stopped, dehydrated into the dehydrated cake 15, and then disposed of as industrial waste.

また、砂ろ過手段として砂ろ過装置20を備える。砂ろ過装置20(東日本テクノ(株)製、砂ろ過ユニットI.D.750×1950SH)は、水質を浄化するものであって、上澄水に凝集処理剤(ポリ塩化アルミニウムPAC)を混入した水溶液を砂ろ過し、上澄水中の浮遊物質(SS)をろ過材に捕捉する。砂ろ過されたろ過水は、送水用配管を介して、活性炭ろ過手段としての活性炭吸着装置22に送水されるようになっている。   Moreover, the sand filter 20 is provided as a sand filter. The sand filtration device 20 (manufactured by East Japan Techno Co., Ltd., sand filtration unit ID 750 × 1950SH) purifies water quality, and is an aqueous solution in which a coagulation treatment agent (polyaluminum chloride PAC) is mixed with supernatant water. Is filtered with sand, and suspended solids (SS) in the supernatant water are captured by the filter material. The sand-filtered filtered water is sent to an activated carbon adsorbing device 22 as an activated carbon filtering means through a water feeding pipe.

活性炭吸着装置22(東日本テクノ(株)製、活性炭吸着ユニットI.D.1050×1950SH)は、砂ろ過されたろ過水中のダイオキシン類を吸着するものである。活性炭ろ過されたろ過水は、送水用配管を介して、精密ろ過手段としての精密ろ過装置24に送水されるようになっている。   The activated carbon adsorption device 22 (manufactured by East Japan Techno Co., Ltd., activated carbon adsorption unit ID 1050 × 1950SH) adsorbs dioxins in the sand-filtered filtered water. The filtered water that has been subjected to activated carbon filtration is fed to a microfiltration device 24 as a microfiltration means via a water delivery pipe.

精密ろ過装置24((株)ロキテクノ製、精密ろ過ユニット750F−GZ−003)は、活性炭ろ過されたろ過水中のアスベスト繊維を除去するものである。精密ろ過装置24は、アスベスト繊維を除去するろ過フィルターと、記録水槽を有する。ろ過フィルターでは多段ろ過によりアスベスト繊維が除去されるようになっている。アスベスト繊維が除去されたろ過水は、記録水槽を経て、処理水貯留槽26に送水用配管を介して送水されるようになっている。
なお、記録水槽では、水質検査(水素イオン濃度pH値、濁度、浮遊物質量SS値などの測定)が行われる。記録水槽には、pH計、濁度計が備えられている。pH、濁度が排水基準値を上回る場合は、処理水貯留槽26の処理水は、原水槽14に送水されるようになっている。
The microfiltration device 24 (manufactured by Roki Techno Co., Ltd., microfiltration unit 750F-GZ-003) removes asbestos fibers in the filtered water after the activated carbon filtration. The microfiltration device 24 has a filtration filter for removing asbestos fibers and a recording water tank. The filtration filter is designed to remove asbestos fibers by multistage filtration. The filtered water from which the asbestos fibers have been removed passes through the recording water tank and is then sent to the treated water storage tank 26 through the water supply pipe.
In the recording water tank, water quality inspection (measurement of hydrogen ion concentration pH value, turbidity, suspended solids amount SS value, etc.) is performed. The recording water tank is equipped with a pH meter and a turbidity meter. When the pH and turbidity exceed the drainage standard values, the treated water in the treated water storage tank 26 is sent to the raw water tank 14.

処理水貯留槽26の処理水は、除染・除去作業中は、高圧水噴射装置28(除染・除去装置)に供給されるようになっている。除染・除去作業終了後は、高圧水噴射装置28への供給を停止し、放流場所32に放流される。   The treated water in the treated water storage tank 26 is supplied to the high-pressure water jet device 28 (decontamination / removal device) during the decontamination / removal work. After the decontamination / removal work is completed, the supply to the high-pressure water injection device 28 is stopped and the water is discharged to the discharge place 32.

砂ろ過装置20や活性炭吸着装置22のろ過機能が低下すると、十分にろ過されないろ過水が精密ろ過装置24に送水されるようになる。すなわち、精密ろ過装置24の精密ろ過のろ過フィルターが目詰まりする可能性がある。排水処理作業中の精密ろ過のろ過フィルターの目詰まりを回避し又は目詰まりの頻度を減らすため、排水処理作業を停止し、砂ろ過装置20や活性炭吸着装置22のろ材を洗浄する逆洗(逆洗浄)を行う。これにより、精密ろ過のろ過フィルターの目詰まりを防ぐことができる。
なお、逆洗(逆洗浄)は、砂ろ過装置20や活性炭吸着装置22のろ過タンク内に蓄積した汚濁物を砂ろ過装置20や活性炭吸着装置22の外に排出させる作業である。逆洗には、既知のろ過装置用5方弁を使用する。逆洗用原水(砂ろ過装置20や活性炭吸着装置22でろ材を逆洗浄する原水)は、処理水貯留槽26の処理水を使用する。また、逆洗排水(砂ろ過装置20や活性炭吸着装置22でろ材を逆洗浄した汚濁物を含む水)は、原水槽14に送水する。
When the filtering function of the sand filter device 20 or the activated carbon adsorption device 22 deteriorates, filtered water that is not sufficiently filtered comes to be sent to the microfiltration device 24. That is, there is a possibility that the microfiltration filter of the microfiltration device 24 is clogged. In order to avoid clogging of the microfiltration filter or reduce the frequency of clogging during the wastewater treatment work, the wastewater treatment work is stopped and the filter material of the sand filtration device 20 and the activated carbon adsorption device 22 is backwashed (reverse washing). Wash). As a result, it is possible to prevent clogging of the microfiltration filter.
The backwashing (backwashing) is a work for discharging the contaminants accumulated in the filtration tanks of the sand filtration device 20 and the activated carbon adsorption device 22 to the outside of the sand filtration device 20 and the activated carbon adsorption device 22. For backwashing, a known five-way valve for a filtration device is used. The raw water for backwashing (raw water for backwashing the filter medium with the sand filter 20 and the activated carbon adsorption device 22) uses the treated water in the treated water storage tank 26. Further, the backwash drainage (water containing contaminants obtained by backwashing the filter medium with the sand filter 20 and the activated carbon adsorption device 22) is sent to the raw water tank 14.

高圧水噴射装置28への水の供給は、作業中は処理水貯留槽26の処理水を供給するが、作業当初は処理水貯留槽26に高圧水噴射装置28への十分な供給量が貯留されるまで水道水を供給するものとする。
また、図1では、改修工事及び解体工事において高圧水噴射装置28の除染・除去により発生する汚染水等は、汚染水貯留槽30に貯留する。汚染水貯留槽30の汚染水等は、バキューム装置又はポンプを用いて簡易脱水装置12に注がれるようになっている。
なお、本発明において、4つのろ過手段に使用される装置は、実施例に記載する装置に限定されるものではなく、当該装置と同等の性能を有するものであれば足りる。
As for the water supply to the high-pressure water injection device 28, the treated water in the treated water storage tank 26 is supplied during the work, but at the beginning of the work, a sufficient supply amount to the high-pressure water injection device 28 is stored in the treated water storage tank 26. The tap water shall be supplied until it is instructed.
Further, in FIG. 1, the contaminated water and the like generated by the decontamination / removal of the high-pressure water injection device 28 in the repair work and the dismantling work are stored in the contaminated water storage tank 30. Contaminated water or the like in the contaminated water storage tank 30 is poured into the simple dehydrator 12 by using a vacuum device or a pump.
In the present invention, the devices used for the four filtering means are not limited to the devices described in the examples, and any device having the same performance as the device is sufficient.

排水処理システム10では、図2に記載の工程で排水処理方法が行われる。図2は、本発明の排水処理方法を表わす処理工程フロー図である。図2の本発明の排水処理方法の工程フローは、建物の改修工事及び解体工事において高圧水噴射装置28に水道水を供給し、スタートする。なお、改修工事及び解体工事において除染・除去により発生する汚染水等を貯留する汚染水貯留槽30は、除染・除去の作業場所に設けられているものとする。
高圧水噴射装置28を用いて除染・除去面に高圧水を噴射する(ステップS1)。除染・除去により発生する汚染水等は、汚染水貯留槽30に流れ込み、貯留される(ステップS2)。汚染水貯留槽30の汚染水等を不織布にて重力ろ過する(ステップS3)。このとき、重力ろ過されたろ過水(濁水)は、原水槽14に貯留される(ステップS4)。
次に、重力ろ過されたろ過水(濁水)を凝集沈殿させる(ステップS5)。これにより、濁水中の重金属や浮遊物質が除去される。このとき、凝集沈殿の上澄水は、中継槽18に貯留される(ステップS6)。また、沈殿汚泥は、産業廃棄物として処理される。
次に、中継槽18に貯留される上澄水を砂ろ過する(ステップS7)。砂ろ過により、上澄水から浮遊物質が除去され浄化される。
次に、砂ろ過されたろ過水を活性炭ろ過する(ステップS8)。活性炭ろ過により、ろ過水中のダイオキシン類などの有機物が除去される。
次に、活性炭ろ過されたろ過水を精密ろ過する(ステップS9)。精密ろ過により、ろ過水中のアスベスト繊維が除去される。精密ろ過されたろ過水(処理水)は、処理水貯留槽26に貯留される(ステップS10)。
処理水貯留槽26に貯留される処理水は、作業中の場合は高圧水として使用される(ステップS1)。一方、作業終了後は放流場所に放流される(ステップS11)。
In the wastewater treatment system 10, the wastewater treatment method is performed in the process shown in FIG. FIG. 2 is a treatment process flow chart showing the wastewater treatment method of the present invention. The process flow of the wastewater treatment method of the present invention in FIG. 2 starts by supplying tap water to the high-pressure water jetting device 28 in the building renovation work and demolition work. The contaminated water storage tank 30 that stores contaminated water and the like generated by decontamination / removal during repair work and demolition work is provided at the decontamination / removal work place.
The high-pressure water jetting device 28 is used to jet high-pressure water on the decontamination / removal surface (step S1). Contaminated water or the like generated by decontamination / removal flows into the contaminated water storage tank 30 and is stored (step S2). The contaminated water or the like in the contaminated water storage tank 30 is gravity filtered with a non-woven fabric (step S3). At this time, the filtered water (turbid water) subjected to gravity filtration is stored in the raw water tank 14 (step S4).
Next, the gravity-filtered filtered water (turbid water) is aggregated and precipitated (step S5). As a result, heavy metals and suspended substances in the turbid water are removed. At this time, the supernatant water of coagulation sedimentation is stored in the relay tank 18 (step S6). Further, the settled sludge is treated as industrial waste.
Next, the supernatant water stored in the relay tank 18 is subjected to sand filtration (step S7). By sand filtration, suspended solids are removed from the supernatant water and purified.
Next, the sand-filtered filtered water is filtered with activated carbon (step S8). Organic matter such as dioxins in the filtered water is removed by the activated carbon filtration.
Next, the filtered water after the activated carbon filtration is microfiltered (step S9). Asbestos fibers in filtered water are removed by microfiltration. The filtered water (treated water) that has been subjected to microfiltration is stored in the treated water storage tank 26 (step S10).
The treated water stored in the treated water storage tank 26 is used as high-pressure water during work (step S1). On the other hand, after the work is finished, it is discharged to the discharge place (step S11).

排水処理作業停止時において、処理水貯留槽26の処理水を使用し、砂ろ過装置20や活性炭吸着装置22でろ材を逆洗浄する(ステップS12)。これにより、精密ろ過のろ過フィルターの目詰まりを防ぐことができる。砂ろ過装置20や活性炭吸着装置22でろ材を逆洗浄した汚濁物を含む水を原水槽14に送水する(ステップS13)。
また、簡易脱水装置12に沈殿槽の沈殿汚泥を送る(ステップS14)。汚泥が溜まった簡易脱水装置12を取り外し、新しい簡易脱水装置12に交換して排水処理作業を継続する。取り外した簡易脱水装置12に溜まった汚泥は、所定の時間放置して濃縮し脱水ケーキ15にした後、産業廃棄物として処分する。汚泥を脱水ケーキ15にすることにより、産業廃棄物の量を減らすことができる。
When the wastewater treatment work is stopped, the treated water in the treated water storage tank 26 is used and the sand filter 20 and the activated carbon adsorption device 22 backwash the filter medium (step S12). As a result, it is possible to prevent clogging of the microfiltration filter. Water containing contaminants obtained by back-cleaning the filter medium with the sand filter 20 and the activated carbon adsorption device 22 is sent to the raw water tank 14 (step S13).
Further, the sludge from the sedimentation tank is sent to the simple dehydrator 12 (step S14). The simple dehydrator 12 in which sludge is accumulated is removed and replaced with a new simple dehydrator 12, and the wastewater treatment work is continued. The sludge collected in the removed simple dewatering device 12 is left for a predetermined time to be concentrated to be a dehydrated cake 15, and then disposed as industrial waste. By using the sludge as the dehydrated cake 15, the amount of industrial waste can be reduced.

本発明の排水処理システム及び排水処理方法は、4つのろ過手段及びろ過工程と濁水処理手段及び濁水処理工程を用いて、建物の改修工事及び解体工事により発生する汚染水等を排水処理するものである。これにより、汚染水等中の重金属、浮遊物質、ダイオキシン類などの有機物、アスベスト繊維を十分に除去することができることから、放流場所の排水基準を満たす処理水を生成できることが期待できる。
また、精密ろ過のろ過フィルターの目詰まりを防ぐことができる。これにより、ダイオキシン類等の除染やアスベスト除去の作業中、精密ろ過された処理水を継続して高圧水噴射機(除染・除去装置)に供給することができる。すなわち、除染・除去作業中は、ろ過用フィルター交換が不要となることから、作業を中断することなく行うことができる。
The wastewater treatment system and the wastewater treatment method of the present invention are for treating contaminated water and the like generated by repair work and demolition work of a building by using four filtering means and filtration steps, and turbid water treatment means and turbid water treatment steps. is there. As a result, it is possible to sufficiently remove heavy metals, suspended solids, organic substances such as dioxins, and asbestos fibers in contaminated water, and it can be expected that treated water that meets the discharge standards of the discharge location can be generated.
Further, it is possible to prevent clogging of the filtration filter of the microfiltration. As a result, during the work of decontaminating dioxins and the like and removing asbestos, the microfiltered treated water can be continuously supplied to the high-pressure water jet (decontamination / removal device). That is, during the decontamination / removal work, it is not necessary to replace the filter for filtration, and therefore the work can be performed without interruption.

また、本発明によると、ダイオキシン類等を含有する汚染水とアスベストを含有する汚染水の排水処理を別々に処理する必要がなく、一工程で行うことができることから、工期を短縮することができる。
また、特定の有害物質やアスベストのみを除去する場合であっても、除去する有害物質やアスベストごとに別々の排水処理システムを用意しなくても、本発明を構成する各処理手段(装置)及び各処理方法の中から、除去する有害物質やアスベストの除去に必要な処理手段及び処理方法のみを選択し組み合わせることにより、除去できる。これにより、除去する有害物質やアスベストごとに別々の排水処理システムを設置する手間や設置スペースの確保が必要なくなる。
Further, according to the present invention, it is possible to shorten the construction period because it is possible to perform the wastewater treatment of the contaminated water containing dioxins and the like and the contaminated water containing the asbestos separately in one step. .
Further, even in the case of removing only specific harmful substances or asbestos, each treatment means (apparatus) constituting the present invention, without preparing a separate wastewater treatment system for each harmful substance or asbestos to be removed, and It can be removed by selecting and combining only the treatment means and the treatment methods necessary for removing the harmful substances and asbestos to be removed from the respective treatment methods. As a result, it is not necessary to install separate wastewater treatment systems for each hazardous substance or asbestos to be removed and to secure an installation space.

10 排水処理システム
12 重力ろ過手段
16 濁水処理手段
20 砂ろ過手段
22 活性炭ろ過手段
24 精密ろ過手段
10 Wastewater Treatment System 12 Gravity Filtration Means 16 Turbid Water Treatment Means 20 Sand Filtration Means 22 Activated Carbon Filtration Means 24 Microfiltration Means

Claims (2)

建物の改修工事及び解体工事により発生する汚水及び/又は汚染水を排水処理するものであって、高圧水噴射装置を用いてダイオキシン類や重金属の除染やアスベスト除去を行う作業場所に、除染・除去により発生する汚水及び/又は汚染水を貯留する汚染水貯留槽と、重力ろ過したろ過水を貯水する原水槽と、凝集沈殿により得られる上澄水を貯水する中継槽と、排水処理された処理水を貯留するとともに、除染・除去作業中は処理水を高圧水噴射装置に供給し、除染・除去作業終了後は高圧水噴射装置への処理水の供給を停止し処理水を放流する処理水貯留槽とを設け、
汚染水貯留槽の汚水及び/又は汚染水を不織布を用いて重力ろ過して脱水し汚泥を取り除く脱水装置と、原水槽に貯水される重力ろ過されたろ過水を凝集沈殿させ重金属を含まない上澄水を得る濁水処理装置と、中継槽に貯水される凝集沈殿により得られる上澄水を砂ろ過し上澄水中の浮遊物質を捕捉する砂ろ過装置と、砂ろ過されたろ過水を活性炭ろ過しダイオキシン類を吸着する活性炭ろ過装置と、活性炭ろ過されたろ過水中のアスベスト繊維をろ過フィルターを用いて除去し処理水を生成する精密ろ過装置とを備え
排水処理作業停止時において、処理水貯留槽の処理水を使用して砂ろ過装置や活性炭吸着装置のろ材を逆洗浄するとともに砂ろ過装置や活性炭吸着装置のろ材の逆洗浄により生じる汚濁物を含む水を原水槽に送水することにより排水処理作業中の精密ろ過のろ過フィルターの目詰まりを防止することを特徴とする排水処理システム。
Wastewater and / or contaminated water generated by building renovation work and demolition work , and is decontaminated at the work place where high pressure water injection equipment is used to remove dioxins and heavy metals and asbestos.・ A contaminated water storage tank that stores the contaminated water and / or contaminated water generated by the removal, a raw water tank that stores the gravity-filtered filtered water, a relay tank that stores the supernatant water obtained by coagulation sedimentation, and a drainage treatment The treated water is stored, and the treated water is supplied to the high-pressure water injection device during the decontamination / removal work, and after the decontamination / removal work is finished, the supply of the treated water to the high-pressure water injection device is stopped and the treated water is discharged. And a treated water storage tank
A dewatering device that removes sludge by gravity-filtering the contaminated water in the contaminated water storage tank and / or contaminated water using a non-woven fabric and a gravity-filtered filtered water stored in the raw water tank that does not contain heavy metals. and obtained Ru turbid water treatment apparatus supernatant water, the supernatant water obtained by coagulation sedimentation is water and sand filtration device to trap suspended solids supernatant water was sand filtration, the filtered water is sand filtered activated carbon filtration to relay tank comprising activated carbon filtration apparatus which adsorbs dioxins, and a microfiltration device for generating treated water was removed using a filtration filter asbestos fibers in the filtered water which has been activated carbon filtration,
When the wastewater treatment work is stopped, the treated water in the treated water storage tank is used to back-wash the filter media of the sand filter and activated carbon adsorber, and the contaminants generated by the back-washing of the filter media of the sand filter and activated carbon adsorber are also included. wastewater treatment system characterized that you prevent clogging of the filtration filter of microfiltration in wastewater treatment operations by water in the raw water tank of water.
建物の改修工事及び解体工事により発生する汚水及び/又は汚染水を排水処理する方法であって、高圧水噴射装置を用いてダイオキシン類や重金属の除染やアスベスト除去を行う作業場所に、除染・除去により発生する汚水及び/又は汚染水を貯留する汚染水貯留槽と、重力ろ過したろ過水を貯水する原水槽と、凝集沈殿により得られる上澄水を貯水する中継槽と、排水処理された処理水を貯留するとともに、除染・除去作業中は処理水を高圧水噴射装置に供給し、除染・除去作業終了後は高圧水噴射装置への処理水の供給を停止し処理水を放流する処理水貯留槽とを設け、
汚染水貯留槽の汚水及び/又は汚染水を不織布を用いて重力ろ過して脱水し汚泥を取り除く脱水工程と、
原水槽に貯水される重力ろ過されたろ過水を凝集沈殿させ重金属を含まない上澄水を得る濁水処理工程と、
中継槽に貯水される凝集沈殿により得られる上澄水を砂ろ過装置を用いて砂ろ過し、上澄水中の浮遊物質を捕捉する砂ろ過工程と、
砂ろ過されたろ過水を活性炭吸着装置を用いて活性炭ろ過しダイオキシン類を吸着する活性炭ろ過工程と、
活性炭ろ過されたろ過水中のアスベスト繊維をろ過フィルターを用いて除去し処理水を生成する精密ろ過工程とを備え
排水処理作業停止時において、処理水貯留槽の処理水を使用して砂ろ過装置や活性炭吸着装置のろ材を逆洗浄するとともに砂ろ過装置や活性炭吸着装置のろ材の逆洗浄に生じる汚濁物を含む水を原水槽に送水することにより排水処理作業中の精密ろ過のろ過フィルターの目詰まりを防止することを特徴とする排水処理方法。
A method for wastewater treatment of contaminated water and / or contaminated water generated by renovation work and demolition work of a building, using a high-pressure water injection device to decontaminate dioxins and heavy metals and asbestos at a work place.・ A contaminated water storage tank that stores the contaminated water and / or contaminated water generated by the removal, a raw water tank that stores the gravity-filtered filtered water, a relay tank that stores the supernatant water obtained by coagulation sedimentation, and a drainage treatment The treated water is stored, and the treated water is supplied to the high-pressure water injection device during the decontamination / removal work, and after the decontamination / removal work is finished, the supply of the treated water to the high-pressure water injection device is stopped and the treated water is discharged. And a treated water storage tank
A dehydration step of removing the sludge by gravity filtering the contaminated water in the contaminated water storage tank and / or the contaminated water using a non-woven fabric,
A turbid water treatment process to obtain Ru the supernatant water not containing heavy metals is coagulated precipitate gravity filtered filtered water is water in the raw water tank,
A sand filtration step in which supernatant water obtained by coagulation sedimentation stored in a relay tank is subjected to sand filtration using a sand filtration device, and a suspended substance in the supernatant water is captured .
An activated carbon filtration step of adsorbing dioxins by filtering the filtered water that has been sand filtered using an activated carbon adsorption device .
And a microfiltration step to produce treated water was removed using a filtration filter asbestos fibers in the filtered water which has been activated carbon filtration,
When the wastewater treatment work is stopped, the treated water in the treated water storage tank is used to back-wash the filter media of the sand filter and activated carbon adsorber, and also the contaminants generated by the back-wash of the filter media of the sand filter and activated carbon adsorber are included. A wastewater treatment method, which prevents clogging of a filtration filter for microfiltration during wastewater treatment work by sending water to a raw water tank .
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