JP2016022448A - Water treatment apparatus and method for washing water treatment facility - Google Patents

Water treatment apparatus and method for washing water treatment facility Download PDF

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JP2016022448A
JP2016022448A JP2014149913A JP2014149913A JP2016022448A JP 2016022448 A JP2016022448 A JP 2016022448A JP 2014149913 A JP2014149913 A JP 2014149913A JP 2014149913 A JP2014149913 A JP 2014149913A JP 2016022448 A JP2016022448 A JP 2016022448A
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cleaning liquid
water treatment
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branch pipe
liquid tank
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JP6344114B2 (en
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西村 総介
Sosuke Nishimura
総介 西村
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Kurita Water Industries Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide a water treatment apparatus and a method for washing a water treatment facility that can reduce a chemical solution usage amount and a washing waste solution disposal amount and suppress washing costs.SOLUTION: A water treatment apparatus includes n units (n is an integer of 3 or more) of water treatment facilities 12, 14, 16, and 18 that are connected in series for sequentially conducting treated water, and m units (m is any integer of 2 to n) among the n units of water treatment facilities which are facilities to be washed. First to m-th washing solution tanks 22, 26, and 28 are disposed corresponding to the first to m-th facilities 12, 16, and 18 to be washed. The water treatment apparatus includes: first to m-th recycling washing means for circulating and passing a washing solution in a k-th (k is an integer of 1 to m) washing solution tank in a forward washing direction to a k-th facility to be washed; and solution feeding means for feeding the washing solution in any one washing solution tank among the first to m-th washing solution tanks to another washing solution tank.SELECTED DRAWING: Figure 1

Description

本発明は、水処理装置及び水処理設備の洗浄方法に関する。   The present invention relates to a water treatment apparatus and a water treatment facility cleaning method.

現在、逆浸透膜(Reverse Osmosis Membrane:RO膜)システムを用いた海水、かん水の淡水化や排水回収が行われている。RO膜は、使用に伴い膜面や細孔内が汚染されて性能が低下するため、定期的に薬品による洗浄が行われる。通常、RO膜の洗浄に用いた洗浄排液は廃棄される。   Currently, desalination and drainage recovery of seawater and brine using a reverse osmosis membrane (Reverse Osmosis Membrane: RO membrane) system is performed. Since the RO membrane is contaminated with the use and the performance of the RO membrane is deteriorated, the RO membrane is regularly cleaned with chemicals. Usually, the cleaning effluent used to clean the RO membrane is discarded.

しかし、原水の汚濁が著しく、RO膜の薬品洗浄の頻度が高い場合、薬品にかかる費用が高くなる。そのため、濾過器や膜濾過装置を用いて前処理を行って、RO膜の汚染物質を予め除去することが行われている。しかし、前処理を行う濾過器や、精密濾過(MF)膜や限外濾過(UF)膜等の膜濾過装置の濾過膜についても、ある程度の薬品洗浄が必要となる場合が多く、洗浄薬品のコストは大きな問題であった。   However, when the raw water is extremely contaminated and the frequency of chemical cleaning of the RO membrane is high, the cost of the chemical becomes high. Therefore, pretreatment is performed using a filter or a membrane filtration device to remove the contaminants in the RO membrane in advance. However, a certain amount of chemical cleaning is often required for filter membranes for pretreatment, membrane filtration devices such as microfiltration (MF) membranes and ultrafiltration (UF) membranes. Cost was a big problem.

特許文献1には、濾過媒体を薬液洗浄する際の洗浄コストを低減させる手法として、逆浸透膜の薬液洗浄排水を除濁設備の洗浄に用いることが記載されている。しかし、特許文献1の手法は、逆浸透膜の薬液洗浄排水を利用して異なるプロセスにある除濁膜の洗浄を行うものであって、前処理装置の洗浄に利用するものではなく、また、複数の単位操作からなる前処理設備の洗浄を行うことについて想定されていない。   Patent Document 1 describes the use of reverse osmosis membrane cleaning wastewater for cleaning turbidity equipment as a technique for reducing the cleaning cost when cleaning a filtration medium. However, the method of Patent Document 1 is for cleaning the turbidity membrane in a different process using the chemical solution waste water of the reverse osmosis membrane, and is not used for cleaning the pretreatment device, It is not envisaged to clean pretreatment equipment consisting of multiple unit operations.

このように、従来、汚濁負荷の高い原水をRO膜で処理する場合、RO膜の薬品洗浄のコストが高くなるという問題があった。特に、前処理設備とRO膜とが組み合わされる場合に、複数の単位操作において薬品洗浄が行われるため、それぞれの設備の汚染程度が一律でなく、あまり汚れていない洗浄液を廃棄するなどの無駄が生じ、薬液使用量や洗浄排液廃棄量が多く、洗浄コストが高くなるという問題があった。   Thus, conventionally, when raw water with a high pollution load is treated with an RO membrane, there has been a problem that the cost of chemical cleaning of the RO membrane is increased. In particular, when pretreatment equipment and RO membranes are combined, chemical cleaning is performed in a plurality of unit operations, so the degree of contamination of each equipment is not uniform, and waste such as discarding cleaning liquid that is not very dirty is wasted. As a result, there is a problem that a large amount of chemical solution is used and a waste amount of cleaning waste liquid is disposed, resulting in an increase in cleaning cost.

特開2011−104504号公報JP 2011-104504 A

本発明は、以上の実情に鑑みてなされたものであり、薬液使用量や洗浄排液廃棄量を低減し、洗浄コストを抑えることができる水処理装置及び水処理設備の洗浄方法を提供することを課題とする。   The present invention has been made in view of the above circumstances, and provides a water treatment apparatus and a water treatment equipment washing method that can reduce the amount of chemical solution used and the amount of waste waste water for washing and reduce the washing cost. Is an issue.

本発明(第1発明)の水処理装置は、被処理水が順次に通水されるように直列に接続された複数の水処理設備と、各水処理設備に対応して設けられ、各水処理設備を洗浄する洗浄液を貯留する複数の洗浄液槽と、を備え、複数の洗浄液槽のうち2つ以上が互いに接続され、該接続された洗浄液槽において、一の洗浄液槽内の洗浄液が他の洗浄液槽へ送液されることを特徴とする。   The water treatment apparatus of the present invention (first invention) is provided corresponding to each water treatment facility and a plurality of water treatment facilities connected in series so that the water to be treated is sequentially passed. A plurality of cleaning liquid tanks for storing cleaning liquid for cleaning the processing equipment, and two or more of the plurality of cleaning liquid tanks are connected to each other, and in the connected cleaning liquid tank, the cleaning liquid in one cleaning liquid tank is another It is characterized by being sent to the cleaning liquid tank.

第1発明では、前記洗浄液槽から、前記複数の水処理設備の少なくとも1つに対して、上流側及び/又は下流側から洗浄液が送液されることが好ましい。   In the first invention, it is preferable that the cleaning liquid is fed from the upstream side and / or the downstream side to the at least one of the plurality of water treatment facilities from the cleaning liquid tank.

第1発明では、対応する洗浄液槽が設けられていない水処理設備をさらに備え、該対応する洗浄液槽が設けられていない水処理設備に対し、前記複数の洗浄液槽のうち少なくともいずれか1つの洗浄液槽内の洗浄液が送液されてもよい。   In the first invention, a water treatment facility not provided with a corresponding cleaning liquid tank is further provided, and at least any one of the plurality of cleaning liquid tanks is provided for the water treatment facility not provided with the corresponding cleaning liquid tank. The cleaning liquid in the tank may be sent.

第1発明では、洗浄が行われない水処理設備をさらに備え、該洗浄が行われない水処理設備をバイパスするように、一の洗浄液槽から他の洗浄液槽へ洗浄液を送液する配管が設けられてもよい。   In the first invention, a water treatment facility that does not perform cleaning is further provided, and a pipe for supplying the cleaning solution from one cleaning solution tank to another cleaning solution tank is provided so as to bypass the water treatment facility that is not cleaned. May be.

本発明(第2発明)の水処理装置は、被処理水が順次に通水されるように直列に接続されたn個(nは3以上の整数)の水処理設備を有する水処理装置において、n個の水処理設備のうちm個(mは2〜nのいずれかの整数)は被洗浄設備であり、第1ないし第mの被洗浄設備に対応して第1ないし第mの洗浄液槽が設置されており、第k(kは1〜mの整数)の洗浄液槽内の洗浄液を第kの被洗浄設備に順洗方向に循環通水するための第1ないし第mの循環洗浄手段と、第1ないし第mの洗浄液槽のうちいずれか1つの洗浄液槽内の洗浄液を他の洗浄液槽に送液するための送液手段と、を備えたことを特徴とする。   The water treatment apparatus of the present invention (second invention) is a water treatment apparatus having n (n is an integer of 3 or more) water treatment facilities connected in series so that the water to be treated is sequentially passed. Of the n water treatment facilities, m (m is an integer from 2 to n) are to-be-cleaned facilities, and the first to m-th cleaning liquids correspond to the first to m-th to-be-cleaned facilities. A tank is installed, and the first to m-th circulating washings for circulating the washing liquid in the k-th washing liquid tank (k is an integer of 1 to m) through the k-th equipment to be washed in the forward washing direction. And a liquid feeding means for feeding the cleaning liquid in any one of the first to m-th cleaning liquid tanks to another cleaning liquid tank.

第2発明では、第j(jは1〜(n−1)の整数)の水処理設備と第(j+1)の水処理設備とを接続し、該第jの水処理設備の処理水を該第(j+1)の水処理設備に導入する第1ないし第(n−1)の接続配管と、各接続配管から分岐する第1ないし第(n−1)の主分岐管と、をさらに備え、第i(iは2〜(n−1)のいずれかの整数)の水処理設備は被洗浄設備であり、第(i−1)の主分岐管は従分岐管により該被洗浄設備に対応する洗浄液槽に接続され、第iの主分岐管は副分岐管により該洗浄液槽に接続され、該被洗浄設備の循環洗浄時には、該洗浄液槽の洗浄液が、該従分岐管、該第(i−1)の主分岐管及び第(i−1)の接続配管を介して該被洗浄設備の一次側に供給され、該被洗浄設備の洗浄排液が、第iの接続配管、該第iの主分岐管及び該副分岐管を介して該洗浄液槽に循環されることが好ましい。   In the second invention, the jth (j is an integer from 1 to (n-1)) water treatment facility and the (j + 1) th water treatment facility are connected, and the treated water of the jth water treatment facility is First to (n-1) connecting pipes to be introduced into the (j + 1) th water treatment facility, and first to (n-1) main branch pipes branching from each connecting pipe, The i-th (i is an integer from 2 to (n-1)) water treatment equipment is the equipment to be cleaned, and the (i-1) main branch pipe corresponds to the equipment to be cleaned by a sub-branch pipe. The i-th main branch pipe is connected to the cleaning liquid tank by a sub-branch pipe, and the cleaning liquid in the cleaning liquid tank is connected to the sub-branch pipe and the (i -1) through the main branch pipe and the (i-1) connecting pipe to the primary side of the equipment to be cleaned, It is preferred to be circulated in the washing liquid tank via the main branch pipe and sub branch pipe of said i.

第2発明では、前記送液手段による洗浄液の送液元の洗浄液槽に対応する被洗浄設備の洗浄頻度は、送液先の洗浄液槽に対応する被洗浄設備の洗浄頻度よりも高く、前記送液手段は、第p(pは1〜(m−1)のいずれかの整数)の洗浄液槽内の洗浄液を後段側の第r(rは(p+1)〜mの少なくとも1つの整数)の洗浄液槽に送液し、第pの被洗浄設備の洗浄頻度は第rの被洗浄設備の洗浄頻度よりも高いことが好ましい。   In the second aspect of the invention, the frequency of cleaning of the equipment to be cleaned corresponding to the cleaning liquid tank that is the liquid supply source of the cleaning liquid by the liquid supply means is higher than the frequency of cleaning of the equipment to be cleaned corresponding to the cleaning liquid tank that is the liquid destination. The liquid means uses the cleaning liquid in the p-th (p is an integer from 1 to (m-1)) cleaning liquid in the rear stage (r is at least one integer from (p + 1) to m). The liquid is fed to the tank, and the cleaning frequency of the p-th equipment to be cleaned is preferably higher than the cleaning frequency of the r-th equipment to be cleaned.

本発明(第3発明)の水処理装置は、被処理水が順次に通水されるように直列に接続されたn個(nは3以上の整数)の水処理設備を有する水処理装置において、n個の水処理設備のうちm個(mは2〜nの整数)は被洗浄設備であり、第1ないし第mの被洗浄設備に対応して第1ないし第mの洗浄液槽が設置されており、第s(sは1〜(m−1)の整数)の被洗浄設備に対し、第sの洗浄液槽内の洗浄液を逆洗方向に循環通水するための第1ないし第(m−1)の循環逆洗浄手段と、該第sの洗浄液槽に対し、その前段側又は後段側の洗浄液槽内の洗浄液を送液するための送液手段と、を備えたことを特徴とする。   The water treatment device of the present invention (third invention) is a water treatment device having n (n is an integer of 3 or more) water treatment equipment connected in series so that the water to be treated is sequentially passed. Of the n water treatment facilities, m (m is an integer from 2 to n) are facilities to be cleaned, and first to m-th cleaning liquid tanks are installed corresponding to the first to m-th to-be-cleaned facilities. The first to the (th) thru (s) for circulating the cleaning liquid in the s-th cleaning liquid tank in the back-washing direction with respect to the s-th (s is an integer of 1 to (m-1)) equipment to be cleaned. m-1), and a liquid feeding means for feeding the cleaning liquid in the preceding or subsequent cleaning liquid tank to the s-th cleaning liquid tank. To do.

第3発明では、第j(jは1〜(n−1)の整数)の水処理設備と第(j+1)の水処理設備とを接続し、該第jの水処理設備の処理水を該第(j+1)の水処理設備に導入する第1ないし第(n−1)の接続配管と、各接続配管から分岐する第1ないし第(n−1)の主分岐管と、をさらに備え、第i(iは2〜(n−1)のいずれかの整数)の水処理設備は被洗浄設備であり、第(i−1)の主分岐管は第(i−1)の従分岐管により該被洗浄設備に対応する洗浄液槽に接続され、第iの主分岐管は副分岐管により該洗浄液槽に接続され、該被洗浄設備の逆洗浄時には、該洗浄液槽の洗浄液が、該副分岐管、該第iの主分岐管及び第iの接続配管を介して該被洗浄設備の二次側に供給され、該被洗浄設備の洗浄排液が、第(i−1)の接続配管、該第(i−1)の主分岐管及び該第(i−1)の従分岐管を介して該洗浄液槽に循環されることが好ましい。   In the third aspect of the invention, the jth (j is an integer from 1 to (n-1)) water treatment facility and the (j + 1) th water treatment facility are connected, and the treated water of the jth water treatment facility is First to (n-1) connecting pipes to be introduced into the (j + 1) th water treatment facility, and first to (n-1) main branch pipes branching from each connecting pipe, The i-th (i is an integer from 2 to (n-1)) water treatment facility is a facility to be cleaned, and the (i-1) main branch pipe is the (i-1) sub-branch pipe. Is connected to the cleaning liquid tank corresponding to the equipment to be cleaned, the i-th main branch pipe is connected to the cleaning liquid tank by a sub-branch pipe, and the cleaning liquid in the cleaning liquid tank is It is supplied to the secondary side of the equipment to be cleaned through the branch pipe, the i-th main branch pipe and the i-th connection pipe, and the cleaning drainage of the equipment to be cleaned is connected to the (i-1) -th contact. Pipe, said (i-1) of the preferred to be circulated in the washing liquid tank via the sub branch of the main branch pipe and said (i-1).

第3発明では、前記第iの主分岐管は、第iの従分岐管により後段側の洗浄液槽に接続され、該被洗浄設備の循環逆洗浄前に、該後段側の洗浄液槽の洗浄液が、該第iの従分岐管、該第iの主分岐管及び前記第iの接続配管を介して該被洗浄設備の二次側に供給され、該被洗浄設備の洗浄排液が、前記第(i−1)の接続配管、前記第(i−1)の主分岐管及び前記第(i−1)の従分岐管を介して該被洗浄設備に対応する洗浄液槽に導入されることが好ましい。   In the third aspect of the invention, the i-th main branch pipe is connected to the rear-stage side cleaning liquid tank by the i-th sub-branch pipe, and before the circulating backwashing of the equipment to be cleaned, , And supplied to the secondary side of the equipment to be cleaned via the i-th sub-branch pipe, the i-th main branch pipe and the i-th connection pipe, It is introduced into the cleaning liquid tank corresponding to the equipment to be cleaned through the connection pipe of (i-1), the (i-1) main branch pipe and the (i-1) sub branch pipe. preferable.

本発明では、前記第1ないし第mの被洗浄設備は、濾過器、精密濾過膜装置、限外濾過膜装置、逆浸透膜装置、又は紫外線照射装置であり、被洗浄設備でない水処理設備は、処理水槽、生物処理槽、生物活性炭塔、ポンプ、脱炭酸塔、又は脱気膜装置であることが好ましい。   In the present invention, the first to m-th cleaning equipment is a filter, a microfiltration membrane device, an ultrafiltration membrane device, a reverse osmosis membrane device, or an ultraviolet irradiation device, and the water treatment equipment that is not the cleaning equipment is A treatment water tank, a biological treatment tank, a biological activated carbon tower, a pump, a decarbonation tower, or a degassing membrane device is preferable.

本発明では、前記第nの水処理設備の後段に、該第nの水処理設備の処理水が導入される高次水処理設備がさらに設けられてもよい。   In the present invention, a high-order water treatment facility into which treated water of the n-th water treatment facility is introduced may be further provided downstream of the n-th water treatment facility.

本発明(第4発明)の水処理設備の洗浄方法は、上記第2発明による水処理装置の少なくとも一部の水処理設備の洗浄を行う洗浄方法であって、第kの被洗浄設備と第kの洗浄液槽との間で洗浄液を順方向に循環させて該第kの被洗浄設備を洗浄する工程を備え、該第kの被洗浄設備の循環洗浄後、該第kの洗浄液槽内の洗浄液を他の洗浄液槽に送液し、この洗浄液槽に対応する濾過装置の洗浄液として使用することを特徴とする。   The water treatment facility cleaning method of the present invention (the fourth invention) is a cleaning method for cleaning at least a part of the water treatment facility of the water treatment apparatus according to the second invention, wherein a cleaning liquid is circulated in a forward direction between the cleaning liquid tanks of k and the kth equipment to be cleaned is cleaned, and after the circulating cleaning of the kth equipment to be cleaned, The cleaning liquid is sent to another cleaning liquid tank, and is used as a cleaning liquid for a filtration device corresponding to the cleaning liquid tank.

本発明(第5発明)の水処理設備の洗浄方法は、上記第3発明による水処理装置の少なくとも一部の水処理設備の洗浄を行う洗浄方法であって、第sの洗浄液槽に対し、後段側の洗浄液槽内の洗浄液を送液する工程と、前記第sの被洗浄設備と該第sの洗浄液槽との間で洗浄液を逆洗方向に循環させて該第sの被洗浄設備を洗浄する工程と、を備える。   The water treatment facility cleaning method of the present invention (the fifth invention) is a cleaning method for cleaning at least a part of the water treatment facility of the water treatment apparatus according to the third invention, and is for the sth cleaning liquid tank. The step of feeding the cleaning liquid in the cleaning liquid tank on the rear stage side, and circulating the cleaning liquid in the backwash direction between the s-th cleaning equipment and the s-th cleaning liquid tank, thereby providing the s-th cleaning equipment And a step of cleaning.

本発明によれば、1つの水処理設備の洗浄排液を他の水処理設備の順洗又は逆洗に再利用するため、薬液使用量や洗浄排液廃棄量が低減し、薬液コストや排液処理の負担を軽減して、洗浄コストを抑えることができる。   According to the present invention, since the washing drainage of one water treatment facility is reused for the forward washing or backwashing of another water treatment facility, the amount of chemical solution used and the amount of waste cleaning wastewater are reduced, and the cost and waste of the chemical solution are reduced. The burden of the liquid treatment can be reduced and the cleaning cost can be reduced.

本発明の実施形態に係る水処理装置の概略図である。It is the schematic of the water treatment apparatus which concerns on embodiment of this invention. RO膜ユニットの循環洗浄処理を説明する図である。It is a figure explaining the circulation washing process of RO membrane unit. 保安フィルターの循環洗浄処理を説明する図である。It is a figure explaining the circulation washing process of a security filter. UF膜ユニットの循環洗浄処理を説明する図である。It is a figure explaining the circulation washing process of a UF membrane unit. 保安フィルターの逆洗処理を説明する図である。It is a figure explaining the backwash process of a security filter. UF膜ユニットの逆洗処理を説明する図である。It is a figure explaining the backwash process of a UF membrane unit. 保安フィルターの循環逆洗処理を説明する図である。It is a figure explaining the circulation backwash process of a safety filter. UF膜ユニットの循環逆洗処理を説明する図である。It is a figure explaining the circulation backwash process of a UF membrane unit. UF膜ユニットの循環逆洗処理を説明する図である。It is a figure explaining the circulation backwash process of a UF membrane unit. UF膜ユニットの循環逆洗処理を説明する図である。It is a figure explaining the circulation backwash process of a UF membrane unit. 保安フィルターの逆洗処理を説明する図である。It is a figure explaining the backwash process of a security filter. UF膜ユニットの逆洗処理を説明する図である。It is a figure explaining the backwash process of a UF membrane unit. 変形例による水処理装置の概略図である。It is the schematic of the water treatment apparatus by a modification. 変形例による水処理装置の概略図である。It is the schematic of the water treatment apparatus by a modification.

以下に本発明の実施の形態を詳細に説明する。   Hereinafter, embodiments of the present invention will be described in detail.

本発明の実施形態に係る水処理装置は、原水(被処理水)が順次に通水されるように直列に接続された複数の水処理設備と、薬液での洗浄を行う水処理設備(被洗浄設備)に対応して設置された複数の洗浄液槽とを備える。図1は、水処理装置の一例として、直列に接続された4段の水処理設備が設けられ、4段のうち3段が薬液での洗浄を行う濾過装置であり、各濾過装置に対応した3つの洗浄液槽が設けられたものを示す。図1に示すように、水処理装置は、第1水処理設備(第1濾過装置)であるUF膜ユニット12、第2水処理設備である付帯設備14、第3水処理設備(第2濾過装置)である保安フィルター16、第4水処理設備(第3濾過装置)であるRO膜ユニット18、UF膜ユニット12に対応する洗浄液槽22(第1洗浄液槽)、保安フィルター16に対応する洗浄液槽26(第2洗浄液槽)、及びRO膜ユニット18に対応する洗浄液槽28(第3洗浄液槽)を備える。   A water treatment apparatus according to an embodiment of the present invention includes a plurality of water treatment facilities connected in series so that raw water (treated water) is sequentially passed, and a water treatment facility (treated) that performs cleaning with a chemical solution. And a plurality of cleaning liquid tanks installed corresponding to the cleaning equipment). As an example of the water treatment apparatus, FIG. 1 is a filtration apparatus in which four stages of water treatment equipment connected in series are provided, and three of the four stages perform cleaning with a chemical solution. The thing provided with three washing | cleaning liquid tanks is shown. As shown in FIG. 1, the water treatment device includes a UF membrane unit 12 that is a first water treatment facility (first filtration device), an auxiliary facility 14 that is a second water treatment facility, and a third water treatment facility (second filtration device). Cleaning filter corresponding to the safety filter 16, the RO membrane unit 18 serving as the fourth water treatment facility (third filtration device), the cleaning liquid tank 22 (first cleaning liquid tank) corresponding to the UF membrane unit 12, and the cleaning liquid corresponding to the safety filter 16. A tank 26 (second cleaning liquid tank) and a cleaning liquid tank 28 (third cleaning liquid tank) corresponding to the RO membrane unit 18 are provided.

第2水処理設備は、薬液での洗浄を行わない又は行うことができない水処理設備であり、本実施形態ではUF処理水槽及び供給ポンプからなる付帯設備14として説明を行う。ここで、薬液での洗浄を行わない又は行うことができない水処理設備は、例えば処理水槽、ポンプ、生物処理槽、生物活性炭塔、脱炭酸塔、脱気膜装置等である。膜濾過装置や濾過器を薬液での洗浄を行わない水処理設備としてもよい。なお、上記水処理設備は例示であり、これらに限定されない。例えば、後述する紫外線照射装置は、アルカリ洗浄液の濃度によってはガラス面の曇りを生ずるので洗浄を避けたり、処理水槽やポンプはスライムの温床になるため洗浄を行ったりする等もあり得る。   The second water treatment facility is a water treatment facility that does not perform or cannot be washed with a chemical solution. In the present embodiment, the second water treatment facility is described as an auxiliary facility 14 including a UF treatment water tank and a supply pump. Here, the water treatment equipment that does not or cannot be washed with a chemical solution is, for example, a treated water tank, a pump, a biological treatment tank, a biological activated carbon tower, a decarbonation tower, a degassing membrane device, or the like. The membrane filtration device or the filter may be a water treatment facility that does not perform cleaning with a chemical solution. In addition, the said water treatment facility is an illustration and is not limited to these. For example, the ultraviolet irradiation apparatus described later may cause the glass surface to become cloudy depending on the concentration of the alkaline cleaning liquid, so that the cleaning may be avoided, or the treatment water tank or pump may be cleaned because it becomes a hotbed of slime.

UF膜ユニット12の一次側には原水配管40が接続されており、図示しない原水タンクから原水配管40を介して、イオンや塩類等の溶質を含む汽水、海水、地下水、埋立地浸出水、有機廃水、生物処理排水等の原水が供給される。UF膜ユニット12は、限外濾過膜(UF膜)を有し、原水を濾過処理して、UF処理水及び濃縮水を得る。UF膜の形状等は特に限定されない。   A raw water pipe 40 is connected to the primary side of the UF membrane unit 12, and brackish water, seawater, ground water, landfill leachate, organic matter containing solutes such as ions and salts from a raw water tank (not shown) through the raw water pipe 40. Raw water such as waste water and biological wastewater is supplied. The UF membrane unit 12 has an ultrafiltration membrane (UF membrane), and filters raw water to obtain UF treated water and concentrated water. The shape of the UF membrane is not particularly limited.

UF膜ユニット12の二次側と付帯設備14のUF処理水槽とが接続配管41(第1接続配管)により接続されており、UF膜ユニット12を透過したUF処理水が接続配管41を介してUF処理水槽に導入される。一方、濃縮水は配管45を介して排出される。配管45から分岐管46、47が分岐し、濃縮水は分岐管46を介して原水タンクに戻される。分岐管47は後述する副分岐管61に接続される。   The secondary side of the UF membrane unit 12 and the UF treatment water tank of the auxiliary equipment 14 are connected by a connection pipe 41 (first connection pipe), and the UF treatment water that has passed through the UF membrane unit 12 passes through the connection pipe 41. It is introduced into the UF treated water tank. On the other hand, the concentrated water is discharged through the pipe 45. Branch pipes 46 and 47 branch from the pipe 45, and the concentrated water is returned to the raw water tank through the branch pipe 46. The branch pipe 47 is connected to a sub branch pipe 61 described later.

付帯設備14の供給ポンプと保安フィルター16の一次側とが接続配管42(第2接続配管)により接続されており、UF処理水槽に貯留されているUF処理水は供給ポンプにより接続配管42を介して保安フィルター16に導入される。   The supply pump of the incidental equipment 14 and the primary side of the safety filter 16 are connected by a connection pipe 42 (second connection pipe), and the UF treated water stored in the UF treated water tank is connected via the connection pipe 42 by the supply pump. Are introduced into the security filter 16.

保安フィルター16の二次側とRO膜ユニット18の一次側とが接続配管43(第3接続配管)により接続されており、保安フィルター16により異物が除去された処理水が接続配管43を介してRO膜ユニット18に導入される。   The secondary side of the safety filter 16 and the primary side of the RO membrane unit 18 are connected by a connection pipe 43 (third connection pipe), and treated water from which foreign matter has been removed by the safety filter 16 is passed through the connection pipe 43. It is introduced into the RO membrane unit 18.

RO膜ユニット18は、逆浸透膜(RO膜)を有し、濾過処理を行い、処理水及び濃縮水を得る。RO膜の形状等は特に限定されない。RO膜ユニット18の二次側には処理水取出管44が接続されており、RO膜ユニット18を透過した処理水が処理水取出管44を介して排出される。一方、濃縮水は配管48を介して原水タンクに戻される。この配管48から分岐管49が分岐しており、分岐管49は洗浄液槽28に接続される。   The RO membrane unit 18 has a reverse osmosis membrane (RO membrane) and performs a filtration treatment to obtain treated water and concentrated water. The shape of the RO membrane is not particularly limited. A treated water extraction pipe 44 is connected to the secondary side of the RO membrane unit 18, and the treated water that has passed through the RO membrane unit 18 is discharged through the treated water extraction pipe 44. On the other hand, the concentrated water is returned to the raw water tank via the pipe 48. A branch pipe 49 branches from the pipe 48, and the branch pipe 49 is connected to the cleaning liquid tank 28.

このように、図1に示す水処理装置では、UF膜ユニット12、付帯設備14、保安フィルター16、及びRO膜ユニット18に原水が順次に通水され、処理される。   As described above, in the water treatment apparatus shown in FIG. 1, raw water is sequentially passed through the UF membrane unit 12, the auxiliary equipment 14, the security filter 16, and the RO membrane unit 18 to be treated.

洗浄液槽22には、UF膜ユニット12のUF膜の循環洗浄を行うための洗浄液が貯留されている。同様に、洗浄液槽26には、保安フィルター16の循環洗浄を行うための洗浄液が貯留されている。また、洗浄液槽28には、RO膜ユニット18のRO膜の循環洗浄を行うための洗浄液が貯留されている。   In the cleaning liquid tank 22, a cleaning liquid for circulating and cleaning the UF membrane of the UF membrane unit 12 is stored. Similarly, the cleaning liquid tank 26 stores cleaning liquid for circulating and cleaning the safety filter 16. The cleaning liquid tank 28 stores cleaning liquid for circulating and cleaning the RO membrane of the RO membrane unit 18.

図1に示すように、原水配管40から先頭分岐管90、92が分岐しており、先頭分岐管90、92は原水配管40と洗浄液槽22とを接続している。先頭分岐管90はポンプのない素通しの配管である。一方、先頭分岐管92はポンプ32が設けられたポンプ付き配管である。   As shown in FIG. 1, leading branch pipes 90 and 92 are branched from the raw water pipe 40, and the leading branch pipes 90 and 92 connect the raw water pipe 40 and the cleaning liquid tank 22. The leading branch pipe 90 is a through pipe without a pump. On the other hand, the leading branch pipe 92 is a pipe with a pump provided with a pump 32.

接続配管41からは主分岐管51(第1主分岐管)が分岐しており、さらに主分岐管51から副分岐管61及び連結管65が分岐している。副分岐管61は主分岐管51と洗浄液槽22とを接続している。連結管65は、主分岐管51と後述する主分岐管52とを連結している。   A main branch pipe 51 (first main branch pipe) branches from the connection pipe 41, and a sub branch pipe 61 and a connecting pipe 65 branch from the main branch pipe 51. The sub branch pipe 61 connects the main branch pipe 51 and the cleaning liquid tank 22. The connecting pipe 65 connects the main branch pipe 51 and a main branch pipe 52 described later.

接続配管42からは主分岐管52(第2主分岐管)が分岐しており、さらに主分岐管52から従分岐管72及び上述の連結管65が分岐している。従分岐管72は主分岐管52と洗浄液槽26とを接続している。また、従分岐管72と並列に、ポンプ36が設けられた従分岐管82が設けられ、従分岐管82によっても主分岐管52と洗浄液槽26とが接続されている。   A main branch pipe 52 (second main branch pipe) branches from the connection pipe 42, and a sub branch pipe 72 and the above-described connecting pipe 65 branch from the main branch pipe 52. The sub branch pipe 72 connects the main branch pipe 52 and the cleaning liquid tank 26. Further, a sub branch pipe 82 provided with a pump 36 is provided in parallel with the sub branch pipe 72, and the main branch pipe 52 and the cleaning liquid tank 26 are also connected by the sub branch pipe 82.

接続配管43からは主分岐管53(第3主分岐管)が分岐しており、さらに主分岐管53から副分岐管63及び従分岐管83が分岐している。副分岐管63は主分岐管53と洗浄液槽26とを接続している。従分岐管83は主分岐管53と洗浄液槽28とを接続し、ポンプ38が設けられている。   A main branch pipe 53 (third main branch pipe) branches from the connection pipe 43, and a sub branch pipe 63 and a sub branch pipe 83 branch from the main branch pipe 53. The sub branch pipe 63 connects the main branch pipe 53 and the cleaning liquid tank 26. The sub branch pipe 83 connects the main branch pipe 53 and the cleaning liquid tank 28 and is provided with a pump 38.

処理水取出管44からは後尾分岐管94が分岐しており、この後尾分岐管94は処理水取出管44と洗浄液槽28とを接続している。   A tail branch pipe 94 branches from the treated water outlet pipe 44, and the tail branch pipe 94 connects the treated water outlet pipe 44 and the cleaning liquid tank 28.

洗浄液槽28には、RO膜ユニット18のRO膜を循環洗浄する洗浄液が貯留されている。この洗浄液は、処理水取出管44及び後尾分岐管94を介して供給されたRO膜ユニット18の処理水と、薬品添加手段96により添加された薬品とを混合したものである。薬品としては、水酸化ナトリウム、水酸化カリウム等のアルカリ剤や、ニトリロ三酢酸(NTA)、エチレンジアミン四酢酸(EDTA)、グルコン酸等のキレート剤等を用いることができる。ただし、洗浄薬品としてはこれら以外のものを用いてもよく、酸や次亜塩素酸塩、結合塩素等の公知の洗浄薬剤を用いることもできる。洗浄薬品は1種を単独で用いてもよく、2種以上を混合して用いてもよい。   A cleaning liquid for circulating and cleaning the RO membrane of the RO membrane unit 18 is stored in the cleaning liquid tank 28. This cleaning liquid is a mixture of the treated water of the RO membrane unit 18 supplied via the treated water extraction pipe 44 and the tail branch pipe 94 and the chemical added by the chemical addition means 96. As the chemical, alkali agents such as sodium hydroxide and potassium hydroxide, chelating agents such as nitrilotriacetic acid (NTA), ethylenediaminetetraacetic acid (EDTA), and gluconic acid can be used. However, other cleaning chemicals may be used as the cleaning chemicals, and known cleaning chemicals such as acids, hypochlorites, and bonded chlorine may be used. One cleaning chemical may be used alone, or two or more cleaning chemicals may be mixed and used.

RO膜ユニット18のRO膜の循環洗浄処理を、図2を用いて説明する。図2では洗浄液の流れを太線で示している。ポンプ38が、洗浄液槽28に貯留されている洗浄液を、従分岐管83、主分岐管53及び接続配管43を介してRO膜ユニット18の一次側に供給し、RO膜の薬液洗浄を行う。RO膜ユニット18の処理水出口から排出される洗浄排液は、処理水取出管44及び後尾分岐管94を介して洗浄液槽28に導入される。また、RO膜ユニット18の濃縮水出口から排出される洗浄排液は、配管48及び分岐管49を介して洗浄液槽28に導入される。このように洗浄液は洗浄液槽28とRO膜ユニット18との間で順方向に循環するようになっている。   The RO membrane circulation cleaning process of the RO membrane unit 18 will be described with reference to FIG. In FIG. 2, the flow of the cleaning liquid is indicated by a bold line. The pump 38 supplies the cleaning liquid stored in the cleaning liquid tank 28 to the primary side of the RO membrane unit 18 through the secondary branch pipe 83, the main branch pipe 53, and the connection pipe 43, and performs chemical cleaning of the RO membrane. The cleaning drainage discharged from the processing water outlet of the RO membrane unit 18 is introduced into the cleaning liquid tank 28 via the processing water extraction pipe 44 and the tail branch pipe 94. In addition, the cleaning waste liquid discharged from the concentrated water outlet of the RO membrane unit 18 is introduced into the cleaning liquid tank 28 through the pipe 48 and the branch pipe 49. In this manner, the cleaning liquid is circulated in the forward direction between the cleaning liquid tank 28 and the RO membrane unit 18.

RO膜の洗浄に使用した洗浄液は徐々に洗浄効果が低下するため、定期的に新品に交換される。洗浄液を新品に交換する際、洗浄液槽28内の洗浄排液は廃棄せずに、ポンプ30により、配管98を介して洗浄液槽22、26へ送液される。ポンプ30による洗浄液槽22、26への送液量は均等でもよいし、いずれか一方の洗浄液槽にのみ送液してもよい。洗浄液槽28内の洗浄液の全て又は大半が洗浄液槽22、26へ送液されると、RO膜ユニット18の処理水が洗浄液槽28に供給される。この際、薬品添加手段96から薬品が添加される。これにより、RO膜の洗浄液が新品に交換される。   Since the cleaning solution used for cleaning the RO membrane gradually decreases its cleaning effect, it is periodically replaced with a new one. When the cleaning liquid is replaced with a new one, the cleaning waste liquid in the cleaning liquid tank 28 is not discarded but sent to the cleaning liquid tanks 22 and 26 via the pipe 98 by the pump 30. The amount of liquid supplied to the cleaning liquid tanks 22 and 26 by the pump 30 may be equal, or may be supplied only to one of the cleaning liquid tanks. When all or most of the cleaning liquid in the cleaning liquid tank 28 is sent to the cleaning liquid tanks 22 and 26, the treated water of the RO membrane unit 18 is supplied to the cleaning liquid tank 28. At this time, a chemical is added from the chemical addition means 96. As a result, the RO membrane cleaning liquid is replaced with a new one.

洗浄液槽26には、保安フィルター16を循環洗浄する洗浄液が貯留されている。この洗浄液は、ポンプ30により洗浄液槽28から送液された洗浄液(RO膜の洗浄排液)である。ただし、濃度調整等のため、接続配管43、主分岐管53及び副分岐管63を介して供給された保安フィルター16の処理水と混合したり、薬品を追加したりすることもできる。保安フィルター16の処理水の代わりにUF膜ユニット12の処理水と混合してもよい。また、第2水処理設備が紫外線照射装置等である場合、第2水処理設備の処理水を混合してもよい。   A cleaning liquid for circulating and cleaning the safety filter 16 is stored in the cleaning liquid tank 26. This cleaning liquid is the cleaning liquid (RO membrane cleaning drainage) sent from the cleaning liquid tank 28 by the pump 30. However, in order to adjust the concentration, etc., it can be mixed with the treated water of the safety filter 16 supplied via the connection pipe 43, the main branch pipe 53 and the sub branch pipe 63, or a chemical can be added. Instead of the treated water of the safety filter 16, the treated water of the UF membrane unit 12 may be mixed. Moreover, when the second water treatment facility is an ultraviolet irradiation device or the like, the treated water of the second water treatment facility may be mixed.

保安フィルター16の循環洗浄処理を、図3を用いて説明する。図3では洗浄液の流れを太線で示している。ポンプ36が、洗浄液槽26に貯留されている洗浄液を、従分岐管82、主分岐管52及び接続配管42を介して保安フィルター16の一次側に供給し、保安フィルター16の薬液洗浄を行う。保安フィルター16の洗浄排液は接続配管43、主分岐管53及び副分岐管63を介して洗浄液槽26に導入される。このように洗浄液は洗浄液槽26と保安フィルター16との間で順方向に循環するようになっている。   The circulation cleaning process of the safety filter 16 will be described with reference to FIG. In FIG. 3, the flow of the cleaning liquid is indicated by a bold line. The pump 36 supplies the cleaning liquid stored in the cleaning liquid tank 26 to the primary side of the safety filter 16 through the secondary branch pipe 82, the main branch pipe 52, and the connection pipe 42, and performs chemical cleaning of the safety filter 16. The cleaning drainage liquid of the safety filter 16 is introduced into the cleaning liquid tank 26 through the connection pipe 43, the main branch pipe 53 and the sub branch pipe 63. Thus, the cleaning liquid is circulated in the forward direction between the cleaning liquid tank 26 and the safety filter 16.

洗浄液槽22には、UF膜ユニット12のUF膜を循環洗浄する洗浄液が貯留されている。この洗浄液は、ポンプ30により洗浄液槽28から送液された洗浄液(RO膜の洗浄排液)である。ただし、濃度調整等のため、接続配管41、主分岐管51及び副分岐管61を介して供給されたUF膜ユニット12の処理水と混合したり、薬品を追加したりすることもできる。また、UF膜ユニット12の処理水の代わりに、UF膜ユニット12の濃縮水と混合してもよいし、原水と混合してもよい。   The cleaning liquid tank 22 stores cleaning liquid for circulating and cleaning the UF membrane of the UF membrane unit 12. This cleaning liquid is the cleaning liquid (RO membrane cleaning drainage) sent from the cleaning liquid tank 28 by the pump 30. However, it is possible to mix with the treated water of the UF membrane unit 12 supplied through the connection pipe 41, the main branch pipe 51, and the sub branch pipe 61, or to add chemicals for concentration adjustment and the like. Moreover, you may mix with the concentrated water of UF membrane unit 12 instead of the treated water of UF membrane unit 12, and may mix with raw | natural water.

UF膜ユニット12のUF膜の循環洗浄処理を、図4を用いて説明する。図4では洗浄液の流れを太線で示している。ポンプ32が、洗浄液槽22に貯留されている洗浄液を、先頭分岐管92及び原水配管40を介してUF膜ユニット12の一次側に供給し、UF膜の薬液洗浄を行う。UF膜ユニット12の処理水出口から排出される洗浄排液は、接続配管41、主分岐管51及び副分岐管61を介して洗浄液槽22に供給される。また、UF膜ユニット12の濃縮水出口から排出される洗浄排液は、配管45、分岐管47及び副分岐管61を介して洗浄液槽22に供給される。このように洗浄液は洗浄液槽22とUF膜ユニット12との間で順方向に循環するようになっている。   The UF membrane circulation cleaning process of the UF membrane unit 12 will be described with reference to FIG. In FIG. 4, the flow of the cleaning liquid is indicated by a bold line. The pump 32 supplies the cleaning liquid stored in the cleaning liquid tank 22 to the primary side of the UF membrane unit 12 via the leading branch pipe 92 and the raw water pipe 40 to perform chemical cleaning of the UF membrane. The cleaning liquid discharged from the treated water outlet of the UF membrane unit 12 is supplied to the cleaning liquid tank 22 through the connection pipe 41, the main branch pipe 51 and the sub branch pipe 61. Further, the cleaning drainage discharged from the concentrated water outlet of the UF membrane unit 12 is supplied to the cleaning liquid tank 22 through the pipe 45, the branch pipe 47 and the sub branch pipe 61. Thus, the cleaning liquid is circulated in the forward direction between the cleaning liquid tank 22 and the UF membrane unit 12.

図1に示す水処理装置では、UF膜ユニット12及び保安フィルター16について、順洗だけでなく逆洗を行うことができる。逆洗の際は、後段側の水処理設備に対応する洗浄液槽内の洗浄液を、前段側の水処理設備の逆洗浄に使用する。後段側の設備の洗浄排液の清浄度は、前段側の設備の逆洗に使用可能な水準のためである。   In the water treatment apparatus shown in FIG. 1, the UF membrane unit 12 and the security filter 16 can be backwashed as well as forward washed. At the time of backwashing, the cleaning liquid in the cleaning liquid tank corresponding to the water treatment equipment on the rear stage side is used for back washing of the water treatment equipment on the front stage side. This is because the cleanliness of the washing waste liquid of the rear side equipment is at a level that can be used for back washing of the front side equipment.

例えば、図5に示すように、ポンプ38が、洗浄液槽28に貯留されている洗浄液を、従分岐管83、主分岐管53及び接続配管43を介して保安フィルター16の二次側に供給し、保安フィルター16の逆洗を行う。保安フィルター16の逆洗に伴う洗浄排液は、接続配管42、主分岐管52及び従分岐管72を介して洗浄液槽26に導入される。このように、洗浄液槽28内の洗浄液が、保安フィルター16に対して逆洗方向に通水し、洗浄液槽26に流入する。   For example, as shown in FIG. 5, the pump 38 supplies the cleaning liquid stored in the cleaning liquid tank 28 to the secondary side of the security filter 16 through the secondary branch pipe 83, the main branch pipe 53, and the connection pipe 43. Then, the safety filter 16 is back-washed. Cleaning drainage accompanying backwashing of the safety filter 16 is introduced into the cleaning liquid tank 26 via the connection pipe 42, the main branch pipe 52 and the sub branch pipe 72. In this way, the cleaning liquid in the cleaning liquid tank 28 passes through the safety filter 16 in the backwash direction and flows into the cleaning liquid tank 26.

また、図6に示すように、ポンプ36が、洗浄液槽26に貯留されている洗浄液を、従分岐管82、連結管65、主分岐管51及び接続配管41を介してUF膜ユニット12の二次側に供給し、UF膜ユニット12の逆洗を行う。UF膜ユニット12の逆洗に伴う洗浄排液は、原水配管40及び先頭分岐管90を介して洗浄液槽22に導入される。このように、洗浄液槽26内の洗浄液が、UF膜ユニット12に対して逆洗方向に通水し、洗浄液槽22に流入する。従分岐管82と主分岐管51とを連結する連結管65が設けられていることにより、洗浄液槽26からの洗浄液を、付帯設備14をバイパスして、UF膜ユニット12の二次側に供給することができる。   In addition, as shown in FIG. 6, the pump 36 allows the cleaning liquid stored in the cleaning liquid tank 26 to pass through the secondary branch pipe 82, the connecting pipe 65, the main branch pipe 51, and the connection pipe 41. The UF membrane unit 12 is backwashed by supplying to the next side. The cleaning waste liquid accompanying backwashing of the UF membrane unit 12 is introduced into the cleaning liquid tank 22 through the raw water pipe 40 and the leading branch pipe 90. In this way, the cleaning liquid in the cleaning liquid tank 26 passes through the UF membrane unit 12 in the backwash direction and flows into the cleaning liquid tank 22. By providing the connecting pipe 65 that connects the secondary branch pipe 82 and the main branch pipe 51, the cleaning liquid from the cleaning liquid tank 26 is supplied to the secondary side of the UF membrane unit 12, bypassing the incidental equipment 14. can do.

隣接する2つの水処理設備を接続する接続配管から分岐する主分岐管を、分岐点の前段側(上流側)の水処理設備の逆洗と、後段側(下流側)の水処理設備の順洗とに用いることで、接続配管についてその全体を洗浄することができる。   The main branch pipe branching from the connecting pipe connecting two adjacent water treatment facilities is divided into the order of backwashing the water treatment facility on the upstream side (upstream side) of the branch point and the water treatment facility on the downstream side (downstream side). By using it for washing, the entire connection pipe can be washed.

例えば、図2及び図5に示すように、保安フィルター16とRO膜ユニット18とを接続する接続配管43から分岐された1本の主分岐管53には、ポンプ38により送液される洗浄液槽28内の洗浄液が流れ、この洗浄液はRO膜の順方向の循環洗浄と保安フィルター16の逆洗に使用することができる。RO膜の循環洗浄と保安フィルター16の逆洗により、接続配管43の全体を洗浄することができる。   For example, as shown in FIGS. 2 and 5, a cleaning liquid tank fed by a pump 38 to one main branch pipe 53 branched from a connection pipe 43 that connects the safety filter 16 and the RO membrane unit 18. The cleaning liquid in the flow 28 flows, and this cleaning liquid can be used for the forward circulation cleaning of the RO membrane and the back cleaning of the safety filter 16. The entire connection pipe 43 can be cleaned by circulating cleaning of the RO membrane and back cleaning of the safety filter 16.

なお、図示は省略するが、各配管には流路切替弁や遮断弁等が設けられており、これらの弁を制御することで、上述したような水処理や洗浄処理が行えるようになっている。   In addition, although illustration is abbreviate | omitted, each piping is provided with the flow-path switching valve, the cutoff valve, etc., By controlling these valves, water treatment and washing | cleaning processing as mentioned above can be performed now. Yes.

本実施形態によれば、RO膜の洗浄排液を前段の水処理設備の洗浄に再利用するため、RO膜の洗浄排液を廃棄する場合と比較して、水処理装置における薬液使用量や洗浄排液廃棄量を低減することで、薬液コストや排液処理の負担を軽減し、洗浄コストを抑えることができる。   According to this embodiment, since the RO membrane cleaning effluent is reused for cleaning the water treatment equipment in the previous stage, compared with the case where the RO membrane cleaning effluent is discarded, By reducing the amount of washing waste liquid discarded, the chemical cost and the burden of waste liquid treatment can be reduced, and the washing cost can be suppressed.

水処理設備の逆洗浄は、後段の水処理設備に対応する洗浄液槽内の洗浄液ではなく、自設備に対応する洗浄液槽内の洗浄液を用いてもよい。例えば、図7に示すように、従分岐管82と副分岐管63とを連結する連結管66を設け、ポンプ36が、洗浄液槽26に貯留されている洗浄液を、従分岐管82、連結管66、副分岐管63、主分岐管53及び接続配管43を介して保安フィルター16の二次側に供給し、保安フィルター16の逆洗を行う。保安フィルター16の逆洗に伴う洗浄排液は、接続配管42、主分岐管52及び従分岐管72を介して洗浄液槽26に導入される。このように、洗浄液槽26内の洗浄液を用いて保安フィルター16の循環逆洗浄処理が行われる。   For the reverse cleaning of the water treatment facility, the cleaning liquid in the cleaning liquid tank corresponding to the own equipment may be used instead of the cleaning liquid in the cleaning liquid tank corresponding to the subsequent water treatment equipment. For example, as shown in FIG. 7, a connecting pipe 66 that connects the sub-branch pipe 82 and the sub-branching pipe 63 is provided, and the pump 36 supplies the cleaning liquid stored in the cleaning liquid tank 26 to the sub-branching pipe 82 and the connecting pipe. 66, the secondary branch pipe 63, the main branch pipe 53, and the connection pipe 43 are supplied to the secondary side of the safety filter 16 to backwash the safety filter 16. Cleaning drainage accompanying backwashing of the safety filter 16 is introduced into the cleaning liquid tank 26 via the connection pipe 42, the main branch pipe 52 and the sub branch pipe 72. In this way, the circulating back cleaning process of the safety filter 16 is performed using the cleaning liquid in the cleaning liquid tank 26.

また、図8に示すように、先頭分岐管92と主分岐管51とを連結する連結管67を設け、ポンプ32が、洗浄液槽22に貯留されている洗浄液を、先頭分岐管92、連結管67、主分岐管51及び接続配管41を介してUF膜ユニット12の二次側に供給し、UF膜ユニット12の逆洗を行う。UF膜ユニット12の一次側は弁で閉じられており、UF膜ユニット12の逆洗に伴う洗浄排液は、UF膜ユニット12の濃縮水出口から排出され、配管45、分岐管47及び副分岐管61を介して洗浄液槽22に導入される。このように、洗浄液槽22内の洗浄液を用いてUF膜ユニット12の循環逆洗浄処理が行われる。   Further, as shown in FIG. 8, a connecting pipe 67 that connects the leading branch pipe 92 and the main branch pipe 51 is provided, and the pump 32 supplies the cleaning liquid stored in the cleaning liquid tank 22 to the leading branch pipe 92 and the connecting pipe. 67, supplying to the secondary side of the UF membrane unit 12 through the main branch pipe 51 and the connection pipe 41, and the UF membrane unit 12 is backwashed. The primary side of the UF membrane unit 12 is closed by a valve, and the cleaning drainage liquid accompanying backwashing of the UF membrane unit 12 is discharged from the concentrated water outlet of the UF membrane unit 12, and the pipe 45, the branch pipe 47, and the sub branch It is introduced into the cleaning liquid tank 22 through the pipe 61. In this way, the circulating back cleaning process of the UF membrane unit 12 is performed using the cleaning liquid in the cleaning liquid tank 22.

洗浄液槽22内の洗浄液を用いるUF膜ユニット12の循環逆洗浄処理については、図9に示すように、先頭分岐管92と接続配管41とを連結する連結管68を設け、ポンプ32が、洗浄液槽22に貯留されている洗浄液を、先頭分岐管92、連結管68及び接続配管41を介してUF膜ユニット12の二次側に供給し、UF膜ユニット12の逆洗を行うようにしてもよい。UF膜ユニット12の一次側は弁で閉じられており、UF膜ユニット12の逆洗に伴う洗浄排液は、UF膜ユニット12の濃縮水出口から排出され、配管45、分岐管47及び副分岐管61を介して洗浄液槽22に導入される。   For the circulating back cleaning process of the UF membrane unit 12 using the cleaning liquid in the cleaning liquid tank 22, as shown in FIG. 9, a connecting pipe 68 for connecting the leading branch pipe 92 and the connecting pipe 41 is provided, and the pump 32 is connected to the cleaning liquid. The cleaning liquid stored in the tank 22 is supplied to the secondary side of the UF membrane unit 12 through the leading branch pipe 92, the connecting pipe 68, and the connection pipe 41 so that the UF membrane unit 12 is back-washed. Good. The primary side of the UF membrane unit 12 is closed by a valve, and the cleaning drainage liquid accompanying backwashing of the UF membrane unit 12 is discharged from the concentrated water outlet of the UF membrane unit 12, and the pipe 45, the branch pipe 47, and the sub branch It is introduced into the cleaning liquid tank 22 through the pipe 61.

また、図10に示すように、配管45と洗浄液槽22とを接続する配管69を設けるとともに副分岐管61にポンプ33を設け、このポンプ33が、洗浄液槽22に貯留されている洗浄液を、副分岐管61、主分岐管51及び接続配管41を介してUF膜ユニット12の二次側に供給し、UF膜ユニット12の逆洗を行ってもよい。UF膜ユニット12の一次側は弁で閉じられており、UF膜ユニット12の逆洗に伴う洗浄排液は、UF膜ユニット12の濃縮水出口から排出され、配管45及び配管69を介して洗浄液槽22に導入される。   Further, as shown in FIG. 10, a pipe 69 for connecting the pipe 45 and the cleaning liquid tank 22 is provided, and a pump 33 is provided in the sub branch pipe 61, and the pump 33 stores the cleaning liquid stored in the cleaning liquid tank 22. The UF membrane unit 12 may be backwashed by supplying it to the secondary side of the UF membrane unit 12 via the sub branch pipe 61, the main branch pipe 51 and the connection pipe 41. The primary side of the UF membrane unit 12 is closed by a valve, and the washing drainage liquid accompanying backwashing of the UF membrane unit 12 is discharged from the concentrated water outlet of the UF membrane unit 12 and is passed through the pipe 45 and the pipe 69. It is introduced into the tank 22.

後段の濾過装置に対応する洗浄液槽内の洗浄液を用いて濾過装置を逆洗浄した後、この洗浄液を循環させて逆洗処理を続けて行ってもよい。例えば、図11に示すように、従分岐管82と副分岐管63とを連結する連結管66を設け、ポンプ38が、洗浄液槽28に貯留されている洗浄液を、従分岐管83、主分岐管53及び接続配管43を介して保安フィルター16の二次側に供給し、保安フィルター16の逆洗を行う。保安フィルター16の逆洗に伴う洗浄排液は、接続配管42、主分岐管52及び従分岐管72を介して洗浄液槽26に導入される。この逆洗処理を所定時間行い、洗浄液槽26に洗浄液が所定量貯留されたら、ポンプ38を停止し、ポンプ36を稼働させ、図7と同様に、ポンプ36が、洗浄液槽26に貯留されている洗浄液を、従分岐管82、連結管66、副分岐管63、主分岐管53及び接続配管43を介して保安フィルター16の二次側に供給し、保安フィルター16の逆洗を行う。   After the filter device is back-washed using the cleaning liquid in the cleaning liquid tank corresponding to the latter-stage filter device, the cleaning solution may be circulated to continue the back-washing process. For example, as shown in FIG. 11, a connecting pipe 66 that connects the secondary branch pipe 82 and the secondary branch pipe 63 is provided, and the pump 38 removes the cleaning liquid stored in the cleaning liquid tank 28 from the secondary branch pipe 83 and the main branch. Supplying to the secondary side of the safety filter 16 through the pipe 53 and the connecting pipe 43, the safety filter 16 is backwashed. Cleaning drainage accompanying backwashing of the safety filter 16 is introduced into the cleaning liquid tank 26 via the connection pipe 42, the main branch pipe 52 and the sub branch pipe 72. This back washing process is performed for a predetermined time, and when a predetermined amount of cleaning liquid is stored in the cleaning liquid tank 26, the pump 38 is stopped and the pump 36 is operated, and the pump 36 is stored in the cleaning liquid tank 26 as in FIG. The cleaning liquid is supplied to the secondary side of the safety filter 16 through the secondary branch pipe 82, the connecting pipe 66, the sub branch pipe 63, the main branch pipe 53, and the connection pipe 43, and the safety filter 16 is backwashed.

ポンプ38の停止と、ポンプ36の稼働は同時でもよいし、ポンプ38の停止の方が早くてもよい。また、ポンプ38の停止の方が遅い場合は、ポンプ36により送液される洗浄液が主分岐管53に流れ込むようにポンプ36及びポンプ38の吐出圧力を調整する。また、連結管66にポンプを設け、保安フィルター16の循環逆洗処理の際に、保安フィルター16の逆洗に伴う洗浄排液が、接続配管42、主分岐管52、従分岐管82、連結管66、副分岐管63、主分岐管53及び接続配管43を介して保安フィルター16の二次側に供給されるようにし、洗浄液が洗浄液槽26を経由しないで循環するようにしてもよい。   The stop of the pump 38 and the operation of the pump 36 may be performed simultaneously, or the stop of the pump 38 may be earlier. When the pump 38 is stopped more slowly, the discharge pressures of the pump 36 and the pump 38 are adjusted so that the cleaning liquid fed by the pump 36 flows into the main branch pipe 53. Further, a pump is provided in the connecting pipe 66, and when the safety filter 16 is circulated and backwashed, the cleaning drainage accompanying the backwashing of the safety filter 16 is connected to the connection pipe 42, the main branch pipe 52, the sub branch pipe 82, and the connection. The cleaning liquid may be supplied to the secondary side of the safety filter 16 through the pipe 66, the sub branch pipe 63, the main branch pipe 53, and the connection pipe 43 so that the cleaning liquid circulates without passing through the cleaning liquid tank 26.

同様に、図8、図9又は図10に示す連結管67、連結管68又はポンプ33を設け、図6に示すUF膜ユニット12の逆洗処理を所定時間行い、洗浄液槽22に洗浄液を所定量貯留した後、ポンプ36を停止し、図8、図9又は図10に示すUF膜ユニット12の循環逆洗処理を行ってもよい。また、UF膜ユニット12の循環逆洗処理の前に、図12に示すように、ポンプ38が、洗浄液槽28に貯留されている洗浄液を、従分岐管83、副分岐管63、連結管66、従分岐管82、連結管65、主分岐管51及び接続配管41を介してUF膜ユニット12の二次側に供給し、UF膜ユニット12の逆洗を行ってもよい。連結管65及び66が設けられていることにより、洗浄液槽28からの洗浄液を、保安フィルター16及び付帯設備14をバイパスして、UF膜ユニット12の二次側に供給することができる。UF膜ユニット12の逆洗に伴う洗浄排液は、原水配管40及び先頭分岐管90を介して洗浄液槽22に導入される。   Similarly, the connecting pipe 67, the connecting pipe 68, or the pump 33 shown in FIG. 8, FIG. 9, or FIG. 10 is provided, and the UF membrane unit 12 shown in FIG. After the fixed amount storage, the pump 36 may be stopped, and the circulation back washing process of the UF membrane unit 12 shown in FIG. 8, FIG. 9 or FIG. 10 may be performed. Further, as shown in FIG. 12, before the circulating back washing process of the UF membrane unit 12, the pump 38 supplies the cleaning liquid stored in the cleaning liquid tank 28 to the sub branch pipe 83, the sub branch pipe 63, and the connecting pipe 66. The UF membrane unit 12 may be back-washed by supplying it to the secondary side of the UF membrane unit 12 through the secondary branch pipe 82, the connecting pipe 65, the main branch pipe 51, and the connection pipe 41. By providing the connecting pipes 65 and 66, the cleaning liquid from the cleaning liquid tank 28 can be supplied to the secondary side of the UF membrane unit 12, bypassing the safety filter 16 and the incidental equipment 14. The cleaning waste liquid accompanying backwashing of the UF membrane unit 12 is introduced into the cleaning liquid tank 22 through the raw water pipe 40 and the leading branch pipe 90.

このように、後段の洗浄液槽内の洗浄液を前段側の洗浄液槽へ送液する場合、配管98を介して後段の洗浄液槽から前段の洗浄液槽へ洗浄液を直接送液するだけでなく、前段側の濾過装置の逆洗を行いつつ送液することもできる。   As described above, when the cleaning liquid in the subsequent cleaning liquid tank is sent to the preceding cleaning liquid tank, not only the cleaning liquid is directly sent from the subsequent cleaning liquid tank to the preceding cleaning liquid tank via the pipe 98 but also the front side. The liquid can also be fed while backwashing the filtration device.

前段側の水処理設備は、原水(被処理水)の濁質が多い分、洗浄頻度が高く、後段側の水処理設備よりも洗浄排液の濁度が低くなる場合がある。その場合、前段の水処理設備の洗浄排液を後段の水処理設備の洗浄に再利用することができる。例えば、UF膜ユニット12の洗浄頻度が、保安フィルター16及びRO膜ユニット18の洗浄頻度よりも高い場合、図13に示すように、洗浄液槽22内の洗浄排液を、配管98を介して洗浄液槽26、28へ送液するポンプ31を設ける。送液元となる洗浄液槽22には、UF膜ユニット12のUF膜を循環洗浄する洗浄液が貯留されている。この洗浄液は、接続配管41、主分岐管51及び副分岐管61を介して供給されたUF膜ユニット12の処理水と、薬品添加手段97により添加された薬品とを混合したものである。   The water treatment facility on the front side has a higher washing frequency due to the higher turbidity of the raw water (treated water), and the turbidity of the washing drainage may be lower than the water treatment facility on the rear side. In that case, the washing drainage liquid of the preceding water treatment facility can be reused for washing the subsequent water treatment facility. For example, when the cleaning frequency of the UF membrane unit 12 is higher than the cleaning frequency of the safety filter 16 and the RO membrane unit 18, as shown in FIG. A pump 31 for feeding liquid to the tanks 26 and 28 is provided. A cleaning liquid for circulating and cleaning the UF membrane of the UF membrane unit 12 is stored in the cleaning liquid tank 22 serving as a liquid supply source. This cleaning liquid is a mixture of the treated water of the UF membrane unit 12 supplied via the connection pipe 41, the main branch pipe 51 and the sub branch pipe 61 and the chemical added by the chemical addition means 97.

UF膜の洗浄に使用した洗浄液は徐々に洗浄効果が低下するため、定期的に新品に交換される。洗浄液を新品に交換する際、洗浄液槽22内の洗浄排液は廃棄せずに、ポンプ31により、配管98を介して洗浄液槽26、28へ送液される。洗浄液槽22内の洗浄液の全て又は大半が洗浄液槽26、28へ送液されると、UF膜ユニット12の処理水が洗浄液槽22に供給される。この際、薬品添加手段97から薬品が添加される。これにより、UF膜の洗浄液が新品に交換される。   Since the cleaning effect used for cleaning the UF membrane gradually deteriorates, it is periodically replaced with a new one. When the cleaning liquid is replaced with a new one, the cleaning drainage liquid in the cleaning liquid tank 22 is not discarded but sent to the cleaning liquid tanks 26 and 28 via the pipe 98 by the pump 31. When all or most of the cleaning liquid in the cleaning liquid tank 22 is sent to the cleaning liquid tanks 26 and 28, the treated water of the UF membrane unit 12 is supplied to the cleaning liquid tank 22. At this time, a chemical is added from the chemical addition means 97. As a result, the cleaning liquid for the UF membrane is replaced with a new one.

洗浄液槽26、28へ送液された洗浄排液は、保安フィルター16、RO膜ユニット18の洗浄に用いられる。前段の水処理設備の洗浄排液を後段の水処理設備の洗浄に再利用することで、水処理装置における薬液使用量や洗浄排液廃棄量を低減し、薬液コストや排液処理の負担を軽減して洗浄コストを抑えることができる。洗浄液槽26内の洗浄排液を、配管98を介して洗浄液槽22、28へ送液してもよい。   The cleaning liquid discharged to the cleaning liquid tanks 26 and 28 is used for cleaning the safety filter 16 and the RO membrane unit 18. By reusing the waste water from the previous water treatment facility for washing the water treatment facility in the subsequent stage, the amount of chemical used in the water treatment equipment and the amount of waste water discharged from the waste water can be reduced, reducing the cost of chemicals and the burden of waste liquid treatment. This can reduce the cleaning cost. The cleaning waste liquid in the cleaning liquid tank 26 may be sent to the cleaning liquid tanks 22 and 28 via the pipe 98.

上記実施形態では、UF膜ユニット12、保安フィルター16及びRO膜ユニット18の濾過装置の各々に対応する洗浄液槽22、26及び28を設けているが、2つ以上の濾過装置に対して1つの洗浄液槽を設け、この洗浄液槽の洗浄液を複数の濾過装置にまとめて通水して洗浄を行うようにしてもよい。複数の濾過装置を並列に配置したものを1つの濾過装置とみなし、これら複数の濾過装置に対して1つの洗浄液槽を設けてもよいし、同種又は異種の複数の濾過装置を直列に接続(多段接続)したものを1つの濾過装置とみなし、これら複数の濾過装置に対して1つの洗浄液槽を設けてもよい。例えば、UF膜ユニット12を並列に複数接続し、1つの洗浄液槽から各UF膜ユニット12へ洗浄液を供給することができる。また、例えば、直列に接続された保安フィルター16及びRO膜ユニット18を1つの設備とみなし、保安フィルター16及びRO膜ユニット18に対して1つの洗浄液槽を設けることができる。並列配置される濾過装置や、1つの濾過装置とみなす組み合わせはこれに限定されない。   In the above embodiment, the cleaning liquid tanks 22, 26 and 28 corresponding to the filtration devices of the UF membrane unit 12, the safety filter 16 and the RO membrane unit 18 are provided, but one for two or more filtration devices. A cleaning liquid tank may be provided, and the cleaning liquid in the cleaning liquid tank may be collected and passed through a plurality of filtration devices for cleaning. A plurality of filtration devices arranged in parallel may be regarded as one filtration device, and one cleaning liquid tank may be provided for the plurality of filtration devices, or a plurality of same or different types of filtration devices may be connected in series ( Multi-stage connection) may be regarded as one filtering device, and one cleaning liquid tank may be provided for the plurality of filtering devices. For example, a plurality of UF membrane units 12 can be connected in parallel, and the cleaning liquid can be supplied to each UF membrane unit 12 from one cleaning liquid tank. Further, for example, the safety filter 16 and the RO membrane unit 18 connected in series can be regarded as one facility, and one cleaning liquid tank can be provided for the safety filter 16 and the RO membrane unit 18. A combination of filtration devices arranged in parallel or a single filtration device is not limited to this.

ただし、各濾過装置の洗浄頻度や洗浄液の成分・濃度が異なる場合は、各濾過装置に対応した洗浄液槽を設けることが好ましい。このような構成にすることで、各濾過装置の洗浄時期が重なっても、各洗浄液槽から各濾過装置に対して洗浄液を送液することができるため、洗浄液を廃棄しなくてもよくなる。例えば、UF膜ユニット12では1週間に1回程度の頻度で洗浄が行われ、RO膜ユニット18の洗浄は1ヶ月に1回程度である。   However, when the frequency of cleaning of each filtration device and the components and concentration of the cleaning solution are different, it is preferable to provide a cleaning solution tank corresponding to each filtration device. By adopting such a configuration, the cleaning liquid can be sent from each cleaning liquid tank to each filtering apparatus even when the cleaning times of the respective filtering apparatuses overlap, so that the cleaning liquid need not be discarded. For example, the UF membrane unit 12 is cleaned about once a week, and the RO membrane unit 18 is cleaned about once a month.

また、複数の洗浄液槽を設け、洗浄排液を、汚濁の程度(水質)に応じて分別して貯留してもよい。この場合、前段の濾過装置を構成する単位操作ごとに、洗浄に必要な水質の洗浄排液を選択して利用することで、洗浄排液をさらに効率よく再利用することができる。   Further, a plurality of cleaning liquid tanks may be provided, and the cleaning waste liquid may be separated and stored according to the degree of contamination (water quality). In this case, the cleaning drainage can be reused more efficiently by selecting and using the cleaning drainage having the water quality necessary for the cleaning for each unit operation constituting the preceding filtration device.

上記実施形態において、洗浄液槽28に貯留されているRO膜の洗浄排液をポンプ30により洗浄液槽22、26に送液する際に、各設備の洗浄に適した薬品を追加してもよい。また、RO膜ユニット18からの洗浄排液を洗浄液槽22、26へ供給する手段を設け、洗浄液槽28を介さずにRO膜ユニット18から洗浄液槽22、26へ洗浄排液を直接供給できるようにしてもよい。あるいはまた、RO膜ユニット18からの洗浄排液をUF膜ユニット12又は保安フィルター16の二次側に供給する手段を設け、UF膜ユニット12又は保安フィルター16の逆洗を行うようにしてもよい。   In the above embodiment, when the RO membrane cleaning drainage liquid stored in the cleaning liquid tank 28 is sent to the cleaning liquid tanks 22 and 26 by the pump 30, chemicals suitable for cleaning each facility may be added. Further, a means for supplying the cleaning drainage liquid from the RO membrane unit 18 to the cleaning liquid tanks 22 and 26 is provided so that the cleaning drainage liquid can be directly supplied from the RO membrane unit 18 to the cleaning liquid tanks 22 and 26 without using the cleaning liquid tank 28. It may be. Alternatively, a means for supplying the cleaning drainage liquid from the RO membrane unit 18 to the secondary side of the UF membrane unit 12 or the safety filter 16 may be provided so that the UF membrane unit 12 or the safety filter 16 is back-washed. .

上記実施形態において、ポンプ32が、停止時において流体を素通しにするものである場合は、先頭分岐管90を省略してもよい。   In the above embodiment, when the pump 32 allows fluid to pass through when stopped, the leading branch pipe 90 may be omitted.

上記実施形態では、薬液洗浄を行う水処理設備として3段の濾過装置を設け、各濾過装置に対応して洗浄液槽を設けていたが、濾過装置以外の薬液洗浄を行う水処理設備と、この水処理設備に対応する洗浄液槽を設け、この水処理設備の洗浄を行ってもよい。例えば、図14に示すように、付帯設備14の代わりに薬液洗浄を行う水処理設備としての紫外線照射装置14Aと、この紫外線照射装置14Aに対応する洗浄液槽24を設ける。洗浄液槽24は従分岐管71を介して主分岐管51に接続される。また、従分岐管71と並列に、ポンプ34が設けられた従分岐管81が設けられ、従分岐管81によっても主分岐管51と洗浄液槽24とが接続される。さらに、洗浄液槽24は、副分岐管62を介して主分岐管52に接続される。洗浄液槽24は、ポンプ30により洗浄液槽28から送液された洗浄液が貯留されている。ポンプ34が、洗浄液槽24に貯留されている洗浄液を、従分岐管81、主分岐管51及び接続配管41を介して紫外線照射装置14Aの一次側に供給し、洗浄排液を接続配管42、主分岐管52及び副分岐管62を介して洗浄液槽24に導入することで、紫外線照射装置14Aの循環洗浄処理を行うことができる。その他の構成は図1に示す水処理装置と同様である。図7〜図10、図13に示す水処理装置の第2水処理設備を薬液洗浄を行う水処理設備として、このような洗浄液槽24を追加してもよい。また、従分岐管81と副分岐管62とを連結する連結管を配設することで、図6や図12と同様に、洗浄液槽26、28からの洗浄液を紫外線照射装置14Aや保安フィルター16をバイパスさせて、UF膜ユニット12を逆洗処理することができる。   In the above embodiment, a three-stage filtration device is provided as a water treatment facility for performing chemical cleaning, and a cleaning liquid tank is provided corresponding to each filtration device. However, a water treatment facility for performing chemical cleaning other than the filtration device, and this A cleaning liquid tank corresponding to the water treatment facility may be provided to clean the water treatment facility. For example, as shown in FIG. 14, an ultraviolet irradiation device 14 </ b> A as a water treatment facility for performing chemical cleaning instead of the incidental facility 14 and a cleaning liquid tank 24 corresponding to the ultraviolet irradiation device 14 </ b> A are provided. The cleaning liquid tank 24 is connected to the main branch pipe 51 via the secondary branch pipe 71. Further, a sub branch pipe 81 provided with a pump 34 is provided in parallel with the sub branch pipe 71, and the main branch pipe 51 and the cleaning liquid tank 24 are also connected by the sub branch pipe 81. Further, the cleaning liquid tank 24 is connected to the main branch pipe 52 via the sub branch pipe 62. The cleaning liquid tank 24 stores the cleaning liquid sent from the cleaning liquid tank 28 by the pump 30. The pump 34 supplies the cleaning liquid stored in the cleaning liquid tank 24 to the primary side of the ultraviolet irradiation device 14A via the secondary branch pipe 81, the main branch pipe 51, and the connection pipe 41, and the cleaning waste liquid is connected to the connection pipe 42, By introducing it into the cleaning liquid tank 24 through the main branch pipe 52 and the sub branch pipe 62, it is possible to perform the circulation cleaning process of the ultraviolet irradiation device 14A. The other structure is the same as that of the water treatment apparatus shown in FIG. Such a cleaning liquid tank 24 may be added as a water treatment facility for performing chemical cleaning on the second water treatment facility of the water treatment apparatus shown in FIGS. Further, by providing a connecting pipe for connecting the sub branch pipe 81 and the sub branch pipe 62, the cleaning liquid from the cleaning liquid tanks 26 and 28 is passed through the ultraviolet irradiation device 14A and the safety filter 16 as in FIGS. The UF membrane unit 12 can be backwashed.

上記実施形態による水処理装置では、保安フィルター16とRO膜ユニット18との間に昇圧ポンプが設けられていてもよい。昇圧ポンプは、薬液での洗浄を行わない水処理設備であるため、昇圧ポンプに対応する洗浄液槽は設置されない。昇圧ポンプが設けられる場合、洗浄液槽28からの洗浄液が後段の水処理設備へ供給される際に昇圧ポンプをバイパスするように、分岐管や連結管が配設される。   In the water treatment apparatus according to the above embodiment, a booster pump may be provided between the safety filter 16 and the RO membrane unit 18. Since the booster pump is a water treatment facility that does not perform cleaning with a chemical solution, a cleaning solution tank corresponding to the booster pump is not installed. When a booster pump is provided, a branch pipe or a connecting pipe is provided so as to bypass the booster pump when the cleaning liquid from the cleaning liquid tank 28 is supplied to the subsequent water treatment facility.

薬液での洗浄を行う水処理設備の全てについて、対応する洗浄液槽を設置する必要はなく、対応する洗浄液槽が設置されない水処理設備があってもよい。この場合、他の水処理設備に対応する洗浄液槽から洗浄液が送液され、順洗又は逆洗が行われる。   It is not necessary to install a corresponding cleaning liquid tank for all of the water treatment facilities that perform cleaning with a chemical solution, and there may be a water treatment facility in which a corresponding cleaning liquid tank is not installed. In this case, the cleaning liquid is fed from the cleaning liquid tank corresponding to the other water treatment equipment, and the forward washing or the back washing is performed.

上記実施形態による水処理装置では、RO膜ユニット18の前処理を行う水処理設備の例として、UF膜ユニット12等が設けられていたが、前処理設備はこれらに限定されず、精密濾過(MF)膜を用いた膜濾過装置や濾過器、イオン交換装置、電気透析装置、砂濾過装置、活性炭濾過装置、処理水槽、生物処理槽、生物活性炭塔、脱炭酸塔、脱気膜装置、UV照射装置、ポンプなどを用いることができる。このうち、砂濾過装置、活性炭濾過装置やUV照射装置は薬液で洗浄することができ、これらの設備に対し洗浄液槽を設けてもよい。   In the water treatment apparatus according to the above embodiment, the UF membrane unit 12 and the like are provided as an example of the water treatment facility for pretreatment of the RO membrane unit 18, but the pretreatment facility is not limited to these, and microfiltration ( MF) Membrane filtration device and filter, ion exchange device, electrodialysis device, sand filtration device, activated carbon filtration device, treated water tank, biological treatment tank, biological activated carbon tower, decarbonation tower, degassing membrane device, UV An irradiation device, a pump, or the like can be used. Among these, the sand filtration device, the activated carbon filtration device, and the UV irradiation device can be cleaned with a chemical solution, and a cleaning solution tank may be provided for these facilities.

膜濾過装置等の前処理設備は、デッドエンド型でもよいし、クロスフロー型でもよい。   The pretreatment equipment such as a membrane filtration device may be a dead end type or a cross flow type.

上記実施形態では、水処理設備の一次側又は二次側から洗浄液を流入させて洗浄を行っていたが、設備の特性にあわせて、専用の洗浄ノズルから洗浄液を流入させてもよい。   In the above embodiment, the cleaning liquid is introduced from the primary side or the secondary side of the water treatment facility for cleaning, but the cleaning liquid may be supplied from a dedicated cleaning nozzle in accordance with the characteristics of the facility.

上記実施形態では、各洗浄液槽に、対応する濾過装置の処理水が供給されるようになっているが、前段側の設備の処理水を、後段側の設備の洗浄液に使用するようにしてもよい。例えば、UF膜ユニット12の処理水の一部を洗浄液槽26に供給し、保安フィルター16の洗浄液に混合させてもよい。   In the above embodiment, the treated water of the corresponding filtration device is supplied to each cleaning liquid tank, but the treated water of the front-side equipment is used as the cleaning liquid for the rear-side equipment. Good. For example, a part of the treated water of the UF membrane unit 12 may be supplied to the cleaning liquid tank 26 and mixed with the cleaning liquid of the safety filter 16.

上記実施形態において、RO膜ユニット18の後段に1又は複数の高次水処理設備がさらに設けられていてもよい。   In the above-described embodiment, one or a plurality of high-order water treatment facilities may be further provided in the subsequent stage of the RO membrane unit 18.

12 UF膜ユニット
14 付帯設備
16 保安フィルター
18 RO膜ユニット
22、24、26、28 洗浄液槽
30〜34、36、38 ポンプ
40 原水配管
41、42、43 接続配管
44 処理水取出管
51、52、53 主分岐管
61、62、63 副分岐管
65 連結管
71、72、73、81、82、83 従分岐管
90、92 先頭分岐管
94 末尾分岐管
96、97 薬品添加手段
12 UF membrane unit 14 Auxiliary equipment 16 Security filter 18 RO membrane unit 22, 24, 26, 28 Cleaning liquid tank 30-34, 36, 38 Pump 40 Raw water piping 41, 42, 43 Connection piping 44 Treated water outlet 51, 52, 53 Main branch pipe 61, 62, 63 Sub branch pipe 65 Connection pipe 71, 72, 73, 81, 82, 83 Secondary branch pipe 90, 92 Lead branch pipe 94 Trail branch pipe 96, 97 Chemical addition means

Claims (14)

被処理水が順次に通水されるように直列に接続された複数の水処理設備と、
各水処理設備に対応して設けられ、各水処理設備を洗浄する洗浄液を貯留する複数の洗浄液槽と、
を備え、
複数の洗浄液槽のうち2つ以上が互いに接続され、該接続された洗浄液槽において、一の洗浄液槽内の洗浄液が他の洗浄液槽へ送液されることを特徴とする水処理装置。
A plurality of water treatment facilities connected in series so that the water to be treated is sequentially passed;
A plurality of cleaning liquid tanks provided corresponding to each water treatment facility and storing a cleaning liquid for cleaning each water treatment facility,
With
Two or more of a plurality of cleaning liquid tanks are connected to each other, and in the connected cleaning liquid tanks, the cleaning liquid in one cleaning liquid tank is sent to another cleaning liquid tank.
請求項1において、前記洗浄液槽から、前記複数の水処理設備の少なくとも1つに対して、上流側及び/又は下流側から洗浄液が送液されることを特徴とする水処理装置。   2. The water treatment apparatus according to claim 1, wherein the cleaning liquid is fed from the upstream side and / or the downstream side to at least one of the plurality of water treatment facilities from the cleaning liquid tank. 請求項1又は2において、
対応する洗浄液槽が設けられていない水処理設備をさらに備え、
該対応する洗浄液槽が設けられていない水処理設備に対し、前記複数の洗浄液槽のうち少なくともいずれか1つの洗浄液槽内の洗浄液が送液されることを特徴とする水処理装置。
In claim 1 or 2,
It is further equipped with a water treatment facility that does not have a corresponding cleaning solution tank,
A water treatment apparatus, wherein a cleaning liquid in at least one of the plurality of cleaning liquid tanks is sent to a water treatment facility not provided with the corresponding cleaning liquid tank.
請求項1ないし3のいずれかにおいて、
洗浄が行われない水処理設備をさらに備え、
該洗浄が行われない水処理設備をバイパスするように、一の洗浄液槽から他の洗浄液槽へ洗浄液を送液する配管が設けられることを特徴とする水処理装置。
In any of claims 1 to 3,
It is further equipped with water treatment equipment that is not washed,
A water treatment apparatus characterized in that a pipe for feeding a cleaning liquid from one cleaning liquid tank to another cleaning liquid tank is provided so as to bypass a water treatment facility where the cleaning is not performed.
被処理水が順次に通水されるように直列に接続されたn個(nは3以上の整数)の水処理設備を有する水処理装置において、
n個の水処理設備のうちm個(mは2〜nのいずれかの整数)の水処理設備は被洗浄設備であり、
第1ないし第mの被洗浄設備に対応して第1ないし第mの洗浄液槽が設置されており、
第k(kは1〜mの整数)の洗浄液槽内の洗浄液を第kの被洗浄設備に順洗方向に循環通水するための第1ないし第mの循環洗浄手段と、
第1ないし第mの洗浄液槽のうちいずれか1つの洗浄液槽内の洗浄液を他の洗浄液槽に送液するための送液手段と、
を備えたことを特徴とする水処理装置。
In a water treatment apparatus having n (n is an integer of 3 or more) water treatment equipment connected in series so that water to be treated is sequentially passed,
Of the n water treatment facilities, m (m is an integer from 2 to n) water treatment facilities are equipment to be cleaned,
Corresponding to the first to m-th equipment to be cleaned, first to m-th cleaning liquid tanks are installed,
First to m-th circulating cleaning means for circulating the cleaning liquid in the k-th (k is an integer of 1 to m) cleaning liquid tank through the k-th equipment to be cleaned in the normal cleaning direction;
A liquid feeding means for feeding the cleaning liquid in any one of the first to m-th cleaning liquid tanks to another cleaning liquid tank;
A water treatment apparatus comprising:
請求項5において、
第j(jは1〜(n−1)の整数)の水処理設備と第(j+1)の水処理設備とを接続し、該第jの水処理設備の処理水を該第(j+1)の水処理設備に導入する第1ないし第(n−1)の接続配管と、
各接続配管から分岐する第1ないし第(n−1)の主分岐管と、
をさらに備え、
第i(iは2〜(n−1)のいずれかの整数)の水処理設備は被洗浄設備であり、
第(i−1)の主分岐管は従分岐管により該被洗浄設備に対応する洗浄液槽に接続され、
第iの主分岐管は副分岐管により該洗浄液槽に接続され、
該被洗浄設備の循環洗浄時には、該洗浄液槽の洗浄液が、該従分岐管、該第(i−1)の主分岐管及び第(i−1)の接続配管を介して該被洗浄設備の一次側に供給され、
該被洗浄設備の洗浄排液が、第iの接続配管、該第iの主分岐管及び該副分岐管を介して該洗浄液槽に循環されることを特徴とする水処理装置。
In claim 5,
The jth (j is an integer from 1 to (n-1)) water treatment facility and the (j + 1) th water treatment facility are connected, and the treated water of the jth water treatment facility is connected to the (j + 1) th water treatment facility. First to (n-1) connecting pipes to be introduced into the water treatment facility;
First to (n-1) main branch pipes branching from each connection pipe;
Further comprising
The i-th (i is an integer from 2 to (n-1)) water treatment facility is a facility to be cleaned,
The (i-1) main branch pipe is connected to a cleaning liquid tank corresponding to the equipment to be cleaned by a sub branch pipe,
The i-th main branch pipe is connected to the cleaning liquid tank by a sub branch pipe,
At the time of circulating cleaning of the equipment to be cleaned, the cleaning liquid in the cleaning liquid tank passes through the secondary branch pipe, the (i-1) main branch pipe, and the (i-1) connection pipe. Supplied to the primary side,
A water treatment apparatus characterized in that the cleaning drainage of the equipment to be cleaned is circulated to the cleaning liquid tank through the i-th connecting pipe, the i-th main branch pipe and the sub-branch pipe.
請求項5又は6において、
前記送液手段による洗浄液の送液元の洗浄液槽に対応する被洗浄設備の洗浄頻度は、送液先の洗浄液槽に対応する被洗浄設備の洗浄頻度よりも高いことを特徴とする水処理装置。
In claim 5 or 6,
The water treatment apparatus characterized in that the cleaning frequency of the equipment to be cleaned corresponding to the cleaning liquid tank that is the liquid supply source of the cleaning liquid by the liquid supply means is higher than the cleaning frequency of the equipment to be cleaned that corresponds to the cleaning liquid tank that is the liquid destination. .
被処理水が順次に通水されるように直列に接続されたn個(nは3以上の整数)の水処理設備を有する水処理装置において、
n個の水処理設備のうちm個(mは2〜nの整数)の水処理設備は被洗浄設備であり、
第1ないし第mの被洗浄設備に対応して第1ないし第mの洗浄液槽が設置されており、
第s(sは1〜(m−1)の整数)の被洗浄設備に対し、第sの洗浄液槽内の洗浄液を逆洗方向に循環通水するための第1ないし第(m−1)の循環逆洗浄手段と、
該第sの洗浄液槽に対し、その前段側又は後段側の洗浄液槽内の洗浄液を送液するための送液手段と、
を備えたことを特徴とする水処理装置。
In a water treatment apparatus having n (n is an integer of 3 or more) water treatment equipment connected in series so that water to be treated is sequentially passed,
Of the n water treatment facilities, m (m is an integer from 2 to n) water treatment facilities are to-be-cleaned facilities.
Corresponding to the first to m-th equipment to be cleaned, first to m-th cleaning liquid tanks are installed,
First to (m-1) th to circulate the cleaning liquid in the sth cleaning liquid tank in the backwash direction for the sth (s is an integer of 1 to (m-1)) equipment to be cleaned. Circulating back washing means
Liquid feeding means for feeding the cleaning liquid in the cleaning liquid tank on the front stage or the rear stage to the s-th cleaning liquid tank;
A water treatment apparatus comprising:
請求項8において、
第j(jは1〜(n−1)の整数)の水処理設備と第(j+1)の水処理設備とを接続し、該第jの水処理設備の処理水を該第(j+1)の水処理設備に導入する第1ないし第(n−1)の接続配管と、
各接続配管から分岐する第1ないし第(n−1)の主分岐管と、
をさらに備え、
第i(iは2〜(n−1)のいずれかの整数)の水処理設備は被洗浄設備であり、
第(i−1)の主分岐管は第(i−1)の従分岐管により該被洗浄設備に対応する洗浄液槽に接続され、
第iの主分岐管は副分岐管により該洗浄液槽に接続され、
該被洗浄設備の逆洗浄時には、該洗浄液槽の洗浄液が、該副分岐管、該第iの主分岐管及び第iの接続配管を介して該被洗浄設備の二次側に供給され、
該被洗浄設備の洗浄排液が、第(i−1)の接続配管、該第(i−1)の主分岐管及び該第(i−1)の従分岐管を介して該洗浄液槽に循環されることを特徴とする水処理装置。
In claim 8,
The jth (j is an integer from 1 to (n-1)) water treatment facility and the (j + 1) th water treatment facility are connected, and the treated water of the jth water treatment facility is connected to the (j + 1) th water treatment facility. First to (n-1) connecting pipes to be introduced into the water treatment facility;
First to (n-1) main branch pipes branching from each connection pipe;
Further comprising
The i-th (i is an integer from 2 to (n-1)) water treatment facility is a facility to be cleaned,
The (i-1) main branch pipe is connected to the cleaning liquid tank corresponding to the equipment to be cleaned by the (i-1) sub branch pipe,
The i-th main branch pipe is connected to the cleaning liquid tank by a sub branch pipe,
At the time of reverse cleaning of the equipment to be cleaned, the cleaning liquid in the cleaning liquid tank is supplied to the secondary side of the equipment to be cleaned through the sub-branch pipe, the i-th main branch pipe, and the i-th connection pipe.
The cleaning drainage of the equipment to be cleaned is transferred to the cleaning liquid tank via the (i-1) connecting pipe, the (i-1) main branch pipe and the (i-1) sub branch pipe. A water treatment device that is circulated.
請求項9において、
前記第iの主分岐管は、第iの従分岐管により後段側の洗浄液槽に接続され、
前記被洗浄設備の循環逆洗浄前に、該後段側の洗浄液槽の洗浄液が、該第iの従分岐管、該第iの主分岐管及び前記第iの接続配管を介して該被洗浄設備の二次側に供給され、
該被洗浄設備の洗浄排液が、前記第(i−1)の接続配管、前記第(i−1)の主分岐管及び前記第(i−1)の従分岐管を介して該被洗浄設備に対応する洗浄液槽に導入されることを特徴とする水処理装置。
In claim 9,
The i-th main branch pipe is connected to the cleaning liquid tank on the rear stage side by the i-th sub branch pipe,
Before the circulating backwashing of the equipment to be cleaned, the cleaning liquid in the cleaning liquid tank on the rear stage side is supplied to the equipment to be cleaned via the i-th sub-branch pipe, the i-th main branch pipe, and the i-th connection pipe. Supplied to the secondary side of
The drainage of the equipment to be cleaned is cleaned through the (i-1) connecting pipe, the (i-1) main branch pipe and the (i-1) sub branch pipe. A water treatment apparatus which is introduced into a cleaning liquid tank corresponding to equipment.
請求項5ないし10のいずれかにおいて、
前記第1ないし第mの被洗浄設備は、濾過器、精密濾過膜装置、限外濾過膜装置、逆浸透膜装置、又は紫外線照射装置であり、
被洗浄設備でない水処理設備は、処理水槽、生物処理槽、生物活性炭塔、ポンプ、脱炭酸塔、又は脱気膜装置であることを特徴とする水処理装置。
In any of claims 5 to 10,
The first to m-th equipment to be cleaned is a filter, a microfiltration membrane device, an ultrafiltration membrane device, a reverse osmosis membrane device, or an ultraviolet irradiation device,
The water treatment apparatus which is not a facility to be cleaned is a treated water tank, a biological treatment tank, a biological activated carbon tower, a pump, a decarbonation tower, or a degassing membrane apparatus.
請求項5ないし11のいずれかにおいて、
前記第nの水処理設備の後段に、該第nの水処理設備の処理水が導入される高次水処理設備がさらに設けられたことを特徴とする水処理装置。
In any of claims 5 to 11,
A water treatment apparatus, further comprising a high-order water treatment facility into which treated water of the nth water treatment facility is introduced after the nth water treatment facility.
請求項5ないし7のいずれか1項の水処理装置の少なくとも一部の水処理設備の洗浄を行う洗浄方法であって、
第kの被洗浄設備と第kの洗浄液槽との間で洗浄液を順方向に循環させて該第kの被洗浄設備を洗浄する工程を備え、
該第kの被洗浄設備の循環洗浄後、該第kの洗浄液槽内の洗浄液を他の洗浄液槽に送液し、この洗浄液槽に対応する被洗浄設備の洗浄液として使用することを特徴とする水処理設備の洗浄方法。
A cleaning method for cleaning at least some of the water treatment facilities of the water treatment device according to any one of claims 5 to 7,
Cleaning the k-th equipment to be cleaned by circulating a cleaning liquid in a forward direction between the k-th equipment to be cleaned and the k-th cleaning liquid tank;
After circulating cleaning of the k-th equipment to be cleaned, the cleaning liquid in the k-th cleaning liquid tank is sent to another cleaning liquid tank and used as the cleaning liquid for the cleaning equipment corresponding to this cleaning liquid tank. Cleaning method for water treatment equipment.
請求項8ないし10のいずれか1項の水処理装置の少なくとも一部の水処理設備の洗浄を行う洗浄方法であって、
第sの洗浄液槽に対し、後段側の洗浄液槽内の洗浄液を送液する工程と、
前記第sの被洗浄設備と該第sの洗浄液槽との間で洗浄液を逆洗方向に循環させて該第sの被洗浄設備を洗浄する工程と、
を備える水処理設備の洗浄方法。
A cleaning method for cleaning at least a part of water treatment equipment of the water treatment device according to any one of claims 8 to 10,
A step of feeding the cleaning liquid in the rear cleaning liquid tank to the s-th cleaning liquid tank;
Cleaning the s-th equipment to be cleaned by circulating a cleaning liquid in the backwash direction between the s-th equipment to be cleaned and the s-th cleaning liquid tank;
A method for cleaning a water treatment facility comprising:
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