JPH1128339A - Removal of washing chemicals - Google Patents
Removal of washing chemicalsInfo
- Publication number
- JPH1128339A JPH1128339A JP7910198A JP7910198A JPH1128339A JP H1128339 A JPH1128339 A JP H1128339A JP 7910198 A JP7910198 A JP 7910198A JP 7910198 A JP7910198 A JP 7910198A JP H1128339 A JPH1128339 A JP H1128339A
- Authority
- JP
- Japan
- Prior art keywords
- water
- chemical
- washing water
- filtration
- cleaning
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、ろ過膜装置を洗浄
処理した後の洗浄薬品の除去方法に関するものであっ
て、特に、リンス水を最小限に少なくできる洗浄薬品の
除去方法の改良に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for removing a cleaning chemical after cleaning a filtration membrane device, and more particularly to an improvement in a method for removing a cleaning chemical which can minimize rinsing water.
【０００２】[0002]
【従来の技術】ろ過膜装置としては、高分子化合物ある
いはセラミックからなる管状、中空糸状、モノリス状の
精密ろ過膜または限外ろ過膜をろ過エレメントとし、そ
の膜エレメントを複数集合したろ過装置が広く用いられ
ている。図３に例示するモデル化したろ過膜装置１０に
おいて、膜エレメント１１を境界にして、原水側ろ過室
１２とろ過水側ろ過室１５が形成され、それぞれのろ過
室１２、１５には、下部配管接続口１３、１６および上
部配管接続口１４、１７が設けられている。そして、こ
のろ過装置を運転するときは、図３中の実線が示すよう
に、下部配管接続口１３から原水が原水側ろ過室１２に
供給され、ろ過水は、ろ過水側ろ過室１５の上部配管接
続口１７から取り出されるのである。2. Description of the Related Art As a filtration membrane device, there is widely used a filtration device in which a tubular, hollow fiber, monolithic microfiltration membrane or ultrafiltration membrane made of a polymer compound or ceramic is used as a filtration element and a plurality of the membrane elements are assembled. Used. In the modeled filtration membrane device 10 illustrated in FIG. 3, a raw water-side filtration chamber 12 and a filtered water-side filtration chamber 15 are formed with the membrane element 11 as a boundary, and a lower pipe is provided in each of the filtration chambers 12 and 15. Connection ports 13 and 16 and upper pipe connection ports 14 and 17 are provided. When operating this filtration device, as shown by the solid line in FIG. 3, raw water is supplied from the lower pipe connection port 13 to the raw water-side filtration chamber 12, and the filtered water is supplied to the upper part of the filtered water-side filtration chamber 15. It is taken out from the pipe connection port 17.
【０００３】このろ過膜装置１０において、ろ過運転に
伴い膜エレメント１１に膜閉塞が生じた場合には、例え
ば、クエン酸あるいは次亜塩素酸ナトリウムのような薬
品の水溶液を、図４に示すように、洗浄水タンク２０か
ら原水側ろ過室１２に供給して、膜エレメント１１を浸
漬したり、あるいは上部配管接続口１４から洗浄水タン
ク２０に還流させたり、膜エレメントを通過させて洗浄
した後、ろ過水側ろ過室１５の上部配管接続口１７から
洗浄水タンク２０に還流するように、装置内を循環させ
たりして、洗浄処理を行って、膜のろ過機能を回復させ
るのが通常である。[0003] In this filtration membrane device 10, when the membrane element 11 is clogged with the filtration operation, for example, an aqueous solution of a chemical such as citric acid or sodium hypochlorite is applied as shown in FIG. 4. After being supplied from the washing water tank 20 to the raw water-side filtration chamber 12, the membrane element 11 is immersed, or refluxed from the upper piping connection port 14 to the washing water tank 20, or washed through the membrane element. It is normal to circulate through the apparatus so as to return to the washing water tank 20 from the upper pipe connection port 17 of the filtration water side filtration chamber 15 and perform a washing treatment to recover the filtration function of the membrane. is there.
【０００４】そして、この洗浄処理が終了したときに
は、ろ過膜装置の運転再開の前に、図５、６に示すよう
に、原水側およびろ過側ろ過室１２、１５に充満してい
た薬品洗浄水を抜き出して、洗浄水タンク２０に回収す
る。この場合、上部配管接続口１４、１７から、加圧空
気を送入して薬品洗浄水の抜き出しを促進している。こ
のように、薬品洗浄水を除去するように操作するのであ
るが、膜エレメント１１の微細なろ過孔空間および膜の
支持層内には薬品洗浄水が含浸状態に残留しているとと
もに、ろ過室１２、１５の内部部材にも付着した状態で
残留しているので、これら残留薬品洗浄水を十分に取り
除くには、上記薬品洗浄水の抜き出しの後で清浄な水な
どを装置内に導入してすすぎ処理（以下、リンスとい
う）を行うことが必要であった。When the washing process is completed, before the operation of the filtration membrane apparatus is restarted, as shown in FIGS. 5 and 6, the chemical washing water filled in the raw water-side filtration chambers 12 and 15 is removed. And is collected in the washing water tank 20. In this case, pressurized air is supplied from the upper piping connection ports 14 and 17 to facilitate the removal of the chemical cleaning water. As described above, the operation is performed so as to remove the chemical cleaning water. The chemical cleaning water remains impregnated in the fine filtration hole space of the membrane element 11 and the support layer of the membrane. In order to sufficiently remove the residual chemical cleaning water, clean water or the like is introduced into the apparatus after the chemical cleaning water is extracted, since the residual chemical cleaning water is sufficiently removed since it is also attached to the internal members 12 and 15. It was necessary to perform a rinsing process (hereinafter, referred to as rinsing).
【０００５】ここでこのリンスについて説明すると、リ
ンスには水道水あるいは膜ろ過した清浄な膜ろ過水を用
いて、内部に残ったクエン酸などの薬品をすすぎ出すの
であって、このすすぎのための使用水をリンス水と呼ぶ
こととする。このリンスの操作は、例えば図４の洗浄水
タンク２０をリンス水タンク２０と呼び変えて説明する
と、このリンス水タンク２０からリンス水を原水側ろ過
室１２に供給して、上部配管接続口１４からリンス水タ
ンク２０に還流させたり、膜エレメント１１を通過さ
せ、ろ過水側ろ過室１５の上部配管接続口１７からリン
ス水タンク２０に還流させることで行うことができる。
そして、リンス水中に前記薬品が検出されなくなるま
で、適宜にこの操作を繰り返すことになる。[0005] Here, the rinsing will be described. Rinsing uses tap water or membrane-filtered clean membrane-filtered water to rinse out chemicals such as citric acid remaining inside. The used water is called rinse water. This rinsing operation will be described, for example, by referring to the washing water tank 20 in FIG. 4 as a rinsing water tank 20. Rinsing water is supplied from the rinsing water tank 20 to the raw water-side filtration chamber 12, and the upper pipe connection port 14 is provided. The water can be returned to the rinse water tank 20 or passed through the membrane element 11 and returned to the rinse water tank 20 from the upper pipe connection port 17 of the filtered water side filtration chamber 15.
This operation is appropriately repeated until the chemical is no longer detected in the rinse water.
【０００６】ところが、最近のようにろ過膜装置自体が
大型化してくるに従い、前記した薬品洗浄水が残留する
物量が増大し、そのためにリンス水が大量に必要になっ
てきた結果、ある程度の洗浄用薬品を溶存したリンス排
水が大量に発生することになり、次のような点が問題と
なってきた。 （１）使用後のリンス排水の浄化のため大型の施設が必
要となった。 （２）廃棄物として処分できる場合でも水量が多いため
コストが増加する。 （３）薬品洗浄後の処理水質の安全性を確実にすること
は勿論、安定に運転、処理するために、より確実なリン
スを効率よく行うことが重要な課題となってきた。However, with the recent increase in the size of the filtration membrane device itself, the amount of the chemical cleaning water remaining increases, and as a result a large amount of rinsing water is required. A large amount of rinse wastewater containing dissolved chemicals is generated, and the following problems have been raised. (1) A large facility was required to purify the rinse water after use. (2) Even if it can be disposed of as waste, the cost increases due to the large amount of water. (3) In addition to ensuring the safety of the quality of the treated water after chemical cleaning, it has become an important issue to perform more reliable rinsing efficiently for stable operation and treatment.
【０００７】[0007]
【発明が解決しようとする課題】本発明は、上記の問題
点を解決するためになされたものであり、ろ過膜装置か
ら薬品洗浄水をほぼ完全に除去することを企図するとと
もに、リンス水量を可能な限り削減して、処分の容易化
と処分コストの削減が可能となる洗浄薬品の除去方法を
提供する。DISCLOSURE OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and aims at almost completely removing chemical washing water from a filtration membrane device and reducing the amount of rinse water. Provided is a method for removing cleaning chemicals, which can reduce disposal as much as possible to facilitate disposal and reduce disposal costs.
【０００８】[0008]
【課題を解決するための手段】上記の問題を解決する本
発明の洗浄薬品の除去方法は、精密ろ過膜装置または限
外ろ過膜装置内を薬品洗浄水にて洗浄処理した後、加圧
空気を供給して、その加圧空気により前記ろ過膜装置の
膜エレメントに残留している薬品洗浄水を押し出して除
去することを特徴とするものである。According to the present invention, there is provided a method for removing a cleaning chemical, which comprises the steps of cleaning the inside of a microfiltration membrane device or an ultrafiltration membrane device with a chemical cleaning water, and then applying compressed air. And pressurized air is used to extrude and remove chemical cleaning water remaining in the membrane element of the filtration membrane device.
【０００９】また、本発明は、前記加圧空気によりろ過
側から前記の残留している薬品洗浄水を原水側に押し出
して除去する態様の洗浄薬品の除去方法として具体化す
ることができる。さらに、前記ろ過膜装置から除去した
薬品洗浄水を洗浄水タンクに返送し、回収する態様の洗
浄薬品の除去方法としても具体化することができる。Further, the present invention can be embodied as a cleaning chemical removing method in which the residual chemical cleaning water is pushed out from the filtration side to the raw water side by the pressurized air to be removed. Further, the present invention can be embodied as a method of removing a cleaning chemical in a mode in which the chemical cleaning water removed from the filtration membrane device is returned to a cleaning water tank and collected.
【００１０】さらには、本発明の洗浄薬品の除去方法
は、前記の洗浄方法にしたがって薬品洗浄水により洗浄
処理した、精密ろ過膜装置または限外ろ過膜装置内をリ
ンス水により洗浄し、次いで加圧空気を供給して、その
加圧空気により前記ろ過膜装置の膜エレメントに残留し
ているリンス水を押し出して除去することを特徴とする
ものである。Further, in the method for removing a cleaning chemical of the present invention, the inside of a microfiltration membrane device or an ultrafiltration membrane device, which has been subjected to a cleaning treatment with a chemical cleaning water in accordance with the above-described cleaning method, is washed with rinsing water, and then added. The method is characterized in that pressurized air is supplied, and rinse water remaining in the membrane element of the filtration membrane device is extruded and removed by the pressurized air.
【００１１】[0011]
【発明の実施の形態】次に、本発明の実施形態につい
て、図１〜６を参照しながら説明する。先ず、ろ過膜装
置１０において、ろ過運転に伴い膜エレメント１１に膜
閉塞が生じた場合に、薬品洗浄水を洗浄水タンク２０か
ら原水側ろ過室１２に供給して、膜エレメント１１を洗
浄する処理が終了したときに、ろ過膜装置の運転再開の
前に、原水側およびろ過水側ろ過室１２、１５に充満し
ていた薬品洗浄水を、上部配管接続口１４、１７から、
０．５〜２ｋｇ／ｃｍ2 程度のゲージ圧の加圧空気を送
入しながら抜き出して、洗浄水タンク２０に回収すると
いうステップまでは、先に説明した場合と同様である。Next, an embodiment of the present invention will be described with reference to FIGS. First, in the filtration membrane device 10, when the membrane element 11 is clogged with the filtration operation, the chemical cleaning water is supplied from the cleaning water tank 20 to the raw water filtration chamber 12 to clean the membrane element 11. Is completed, before the operation of the filtration membrane device is restarted, the chemical washing water filled in the raw water side and the filtration water side filtration chambers 12 and 15 is removed from the upper piping connection ports 14 and 17 by
The steps up to the step of extracting the compressed air with a gauge pressure of about 0.5 to 2 kg / cm 2 while feeding it and collecting it in the washing water tank 20 are the same as those described above.
【００１２】本発明の特徴とするところは、前記ステッ
プに続いて、ろ過水側ろ過室１５の下部接続口１６を閉
じ、上部接続口１７から０．５〜５ｋｇ／ｃｍ2 程度の
加圧空気を供給して、その加圧空気により膜エレメント
１１のろ過膜が具備する微細なろ過孔空間やその膜の支
持層内の空間に残留している薬品洗浄水を原水側に押し
出して除去する点にある。この場合、加圧空気の供給
は、前記残留薬品洗浄水が滲み出るように押し出せるゆ
っくりした速さで供給することが好ましく、押し出され
て噴出するような高速、例えば逆洗に用いられるような
高速は不適当である。The feature of the present invention is that, following the above step, the lower connection port 16 of the filtration water side filtration chamber 15 is closed, and the compressed air of about 0.5 to 5 kg / cm 2 is supplied from the upper connection port 17. To remove the chemical cleaning water remaining in the fine filtration hole space provided in the filtration membrane of the membrane element 11 and the space in the support layer of the membrane to the raw water side by the pressurized air. It is in. In this case, the supply of the pressurized air is preferably performed at a slow speed at which the residual chemical cleaning water can be extruded so as to ooze out. High speed is inappropriate.
【００１３】かくして、原水側ろ過室１２の下部に集ま
った前記の除去洗浄水は、図５に示すように、その下部
接続口１３を通じて、ろ過膜装置外に排出すればよいの
である。なお、この実施形態におけるように、加圧空気
をろ過水側から供給して、残留薬品洗浄水を原水側に押
し出すのが、残留薬品洗浄水の回収率を高める点で好ま
しいが、加圧空気を反対側の原水側から供給するように
しても、本発明の目的は一応達成することができる。ま
た、図１に示すように、除去した残留薬品洗浄水を洗浄
水タンク２０に返送すれば、洗浄薬品を回収でき、薬品
の節減も可能となる。[0013] Thus, as shown in FIG. 5, the above-mentioned removed washing water collected in the lower part of the raw water side filtration chamber 12 may be discharged to the outside of the filtration membrane device through the lower connection port 13 thereof. As in this embodiment, it is preferable to supply the pressurized air from the filtered water side and to push out the residual chemical cleaning water to the raw water side from the viewpoint of increasing the recovery rate of the residual chemical cleaning water. Is supplied from the opposite raw water side, the object of the present invention can be achieved for the time being. Further, as shown in FIG. 1, if the removed residual chemical cleaning water is returned to the cleaning water tank 20, the cleaning chemicals can be collected, and the chemicals can be saved.
【００１４】また、図１、３〜６に例示したろ過膜装置
に接続されている原水供給ライン、または排液ライン
は、薬品洗浄水などが完全に流出するような最下部に設
けられているとは限らないので、加圧空気を用いても装
置内底部に薬品洗浄水が若干残留する場合がある。そこ
で、ろ過膜装置１０の最下部に小径配管１８用の接続口
を設けておくと、そのような底部に溜まる水も取り出せ
るので好適であり、特に、この小径配管１８は、排液機
能があればよいのであるから、ホールドの少ない極小径
であるのが好ましい。A raw water supply line or a drain line connected to the filtration membrane device illustrated in FIGS. 1 and 3 to 6 is provided at the lowermost portion where the chemical washing water or the like completely flows out. Therefore, even when pressurized air is used, the chemical cleaning water may slightly remain at the bottom of the apparatus. Therefore, it is preferable to provide a connection port for the small-diameter pipe 18 at the lowermost portion of the filtration membrane device 10 because such water that accumulates at the bottom can be taken out. In particular, the small-diameter pipe 18 has a drainage function. For this reason, it is preferable that the diameter is extremely small with less hold.
【００１５】次に、表１に示す諸元のろ過膜装置に基づ
く、本発明の洗浄薬品の除去方法による作用効果を比較
例とともに説明する。この比較テストでは、クエン酸１
％水溶液の薬品洗浄水５００リットルを用いて洗浄処理
した後、先のリンスについて説明した段落記載の従来の
方法に従い、一回当たり５００リットルの清浄水でリン
ス処理を３回繰り返して行い、そのときのリンス排水の
ｐＨを測定した。なお、比較例は、本発明の特徴とする
加圧空気により膜エレメント中の残留薬品洗浄水を押し
出すという処理を省いたものである。Next, the operation and effect of the method for removing a cleaning chemical of the present invention based on the filtration membrane device having the specifications shown in Table 1 will be described together with comparative examples. In this comparative test, citric acid 1
After washing with 500 liters of a chemical washing water of a 50% aqueous solution, the rinsing treatment is repeated three times with 500 liters of clean water at a time, according to the conventional method described in the paragraph describing the above rinsing. The pH of the rinse wastewater was measured. In the comparative example, the treatment of pushing out the residual chemical cleaning water in the membrane element by the pressurized air, which is a feature of the present invention, was omitted.
【００１６】この比較テストによるリンス排水のｐＨの
変化は、表１の下段に示す通りであり、リンス排水のｐ
Ｈが少なくとも６．５まで回復すれば、リンス処理を終
了できるという基準に照らしてみると、本発明の場合は
第一回目のリンス処理で基準を満たすのに比較して、比
較例の場合はリンス処理を３回繰り返す必要があった。
この結果、比較例ではリンス水量を５００×３＝１５０
０リットルも使用しなければならなかったうえ、リンス
排水を放流するにあたって中和処理のような後処理が必
要となるのに較べて、本発明の洗浄薬品の除去方法によ
れば、中和処理のような特別の後処理が必要でないう
え、比較例の１／３のリンス水量で済ませることができ
る利点が得られた。The change in the pH of the rinse water according to this comparative test is shown in the lower part of Table 1, and the pH of the rinse water is p.
In the light of the criterion that the rinsing process can be completed when H recovers to at least 6.5, in the case of the present invention, the rinsing process is completed in the first rinsing process. The rinsing process had to be repeated three times.
As a result, in the comparative example, the rinse water amount was set to 500 × 3 = 150.
According to the method for removing the cleaning chemicals of the present invention, compared with the case where 0 liters had to be used and a post-treatment such as a neutralization treatment was required to discharge the rinse wastewater, Such a special post-treatment as described above is not required, and an advantage that the amount of rinsing water is only 1/3 of that of the comparative example can be obtained.
【００１７】[0017]
【表１】 注：リンス水量は、１回あたり５００リットルとした。[Table 1] Note: The amount of rinse water was 500 liters each time.
【００１８】さらに、本発明の洗浄薬品の除去方法にお
けるリンスの特徴とするところは、前記薬品洗浄水によ
る洗浄処理後にリンス水による洗浄処理を行い、その洗
浄処理後、加圧空気を供給して、それによって前記膜エ
レメントに残留しているリンス水を押し出して除去する
点にある。図７を参照して説明すると、先に説明した薬
品洗浄水による洗浄が終了した後、リンス水をリンス水
タンク２１ａから原水側ろ過室１２に供給して、膜エレ
メント１１を洗浄しながら通過させ、原水側およびろ過
水側ろ過室１２、１５に充満させる。Further, a feature of the rinsing in the cleaning chemical removing method of the present invention is that a cleaning treatment with rinse water is performed after the cleaning treatment with the chemical cleaning water, and after the cleaning treatment, pressurized air is supplied. Accordingly, the rinsing water remaining in the membrane element is extruded and removed. Referring to FIG. 7, after the above-described cleaning with the chemical cleaning water is completed, rinse water is supplied from the rinse water tank 21a to the raw water-side filtration chamber 12 to pass the membrane element 11 while cleaning. The filtration chambers 12 and 15 on the raw water side and the filtered water side are filled.
【００１９】上記リンスが終了した後、この原水側ろ過
室１２に加圧空気を供給しながら、充満させたリンス水
をリンス水タンク２１ａに排出するのであるが、このと
きに前記供給空気の圧力によって、膜エレメント１１の
ろ過膜の微細なろ過孔空間やその膜の支持層内の空間に
残留しているリンス水をろ過水側に押し出して除去する
のである。そして、排出したリンス水中に先に使用した
洗浄薬品の検出量が許容値になるまで、この操作を繰り
返して、リンスを完全なものとするのである。なお、こ
の場合、ろ過水側から空気を供給して、膜エレメント内
の残留リンス水を原水側に押し出しリンス水を排出する
ようにしてもよい。After the rinsing is completed, the filled rinsing water is discharged to the rinsing water tank 21a while supplying pressurized air to the raw water-side filtration chamber 12. At this time, the pressure of the supply air is reduced. As a result, the rinse water remaining in the fine filtration hole space of the filtration membrane of the membrane element 11 and the space in the support layer of the membrane is pushed out to the filtered water side and removed. This operation is repeated until the detection amount of the previously used cleaning chemicals in the discharged rinse water reaches an allowable value, thereby completing the rinse. In this case, air may be supplied from the filtered water side to push out the remaining rinse water in the membrane element to the raw water side and discharge the rinse water.
【００２０】以上の説明で理解されるように、本発明に
おけるリンスは、先に説明した薬品洗浄水を空気で押し
出して除去する場合における、薬品洗浄水をリンス水で
置き換えた方法であって、薬品洗浄水に関する記載はこ
のリンス水の場合にも共通して適用され得るものであ
る。なお、本発明におけるリンス方法において、リンス
水をろ過水側から供給した場合には、加圧空気の供給を
ろ過水側から行うのが、リンスの目的からして適当であ
り、リンス水と空気の供給は、前記の方法に限定される
ものではない。As understood from the above description, the rinsing in the present invention is a method in which the chemical cleaning water is replaced with the rinsing water in the case where the chemical cleaning water described above is extruded with air and removed. The description relating to the chemical cleaning water can be applied in common to the case of the rinsing water. In the rinsing method of the present invention, when rinsing water is supplied from the filtered water side, it is appropriate to supply pressurized air from the filtered water side for the purpose of rinsing. Is not limited to the above method.
【００２１】次に、表２に、表１の場合と同じろ過膜装
置に基づく、本発明のリンス方法による作用効果を比較
例とともに説明する。この比較テストでは、比較例のリ
ンスでは、一回当たり５００リットルの清浄水をろ過装
置とリンス水タンクの間を循環させて、リンスするとい
う従来のリンス処理を３回繰り返して行い、それぞれの
リンス排水のｐＨを測定した。（この結果は、先の表１
の実施例に相当することになる）Next, in Table 2, the operation and effect of the rinsing method of the present invention based on the same filtration membrane device as in Table 1 will be described together with comparative examples. In this comparative test, in the rinse of the comparative example, the conventional rinse treatment of rinsing by circulating 500 liters of clean water between the filtration device and the rinse water tank at one time was repeated three times, and each rinse was performed. The pH of the effluent was measured. (This result is shown in Table 1 above.
Example)
【００２２】また、本発明の実施例では、リンス水をろ
過装置に充満させた後、排水しながら加圧空気を供給し
て残留リンス水も押し出して除去する操作を３回繰り返
して、同様にそのｐＨを測定した。この場合、各回所要
のリンス水の水量は、ろ過装置内容積の２００リットル
に相当することになる。Further, in the embodiment of the present invention, after the rinsing water is filled in the filtration device, the operation of supplying pressurized air while draining and pushing out and removing the residual rinsing water is repeated three times. The pH was measured. In this case, the amount of rinse water required each time is equivalent to 200 liters of the internal volume of the filtration device.
【００２３】この比較テストの結果は、表２に示す通り
であり、リンス排水のｐＨが少なくとも６．５まで回復
すれば、リンス処理を終了できるという基準に照らして
みると、比較例では第一回目のリンス処理で基準を満た
すものの、５００リットルのリンス水を要するのに対し
て、本発明では２回合計４００リットルで済むという利
点が認められる。さらに、洗浄基準をｐＨ：７．０まで
厳しくした場合には、比較例では５００リットル×２＝
１０００リットルを要するのに較べ、実施例では２００
リットル×２＝４００リットルで済むという、顕著なメ
リットが得られるのである。The results of this comparative test are as shown in Table 2. In light of the criterion that the rinsing treatment can be completed when the pH of the rinsing wastewater is restored to at least 6.5, the first comparative example shows that Although the standard is satisfied in the second rinsing process, 500 liters of rinsing water is required, whereas the present invention has an advantage that a total of 400 liters is required twice. Further, when the washing standard was strictly adjusted to pH: 7.0, 500 liters × 2 =
In this embodiment, 200 liters are required, compared to 1000 liters.
There is a remarkable merit that only 400 liters is required.
【００２４】[0024]
【表２】 注：リンス水量：比較例の場合は、従来と同様な循環方法とし１回あたり５０ ０リットルとした。実施例では、上記の方法とし、１回あたり、膜モジュールと 同容積の２００リットルとした。[Table 2] Note: Rinse water amount: In the case of the comparative example, the circulation method was the same as the conventional method, and the amount was set to 500 liters each time. In the example, the above method was used, and the volume was 200 liters each time, the same volume as the membrane module.
【００２５】[0025]
【発明の効果】本発明の洗浄薬品の除去方法は、以上に
説明したように構成されているので、薬品洗浄水をほぼ
完全に回収することが可能となり、リンス水量を大幅に
節減できるうえ、リンス排水の放流処分の容易化と処分
コストの削減をすることもできる。また、薬品洗浄後、
再開したろ過処理水に洗浄用薬品が混入するリスクを低
減できるからろ過処理水の安全性を向上できるというい
う優れた効果がある。よって本発明は従来の問題点を解
消した洗浄薬品の除去方法として、その工業的価値は極
めて大なるものがある。The method for removing cleaning chemicals according to the present invention is configured as described above, so that chemical cleaning water can be recovered almost completely, and the amount of rinsing water can be greatly reduced. This also facilitates the discharge of rinse water and reduces disposal costs. Also, after chemical cleaning,
There is an excellent effect that the safety of the filtered water can be improved because the risk of mixing the cleaning chemicals into the restarted filtered water can be reduced. Therefore, the present invention has a very large industrial value as a cleaning chemical removing method which has solved the conventional problems.
【図１】本発明の実施形態を説明するための要部フロー
図。FIG. 1 is a main part flowchart for explaining an embodiment of the present invention.
【図２】他の実施形態を説明するための要部フロー図。FIG. 2 is a main part flow chart for explaining another embodiment.
【図３】ろ過運転状態を示す要部フロー図。FIG. 3 is a main part flowchart showing a filtration operation state.
【図４】薬品洗浄のステップを示す要部フロー図。FIG. 4 is a main part flow chart showing steps of chemical cleaning.
【図５】薬品洗浄のステップを示す要部フロー図。FIG. 5 is a main part flow chart showing steps of chemical cleaning.
【図６】薬品洗浄のステップを示す要部フロー図。FIG. 6 is a main part flow chart showing steps of chemical cleaning.
【図７】リンスのステップを示す要部フロー図。FIG. 7 is a main part flowchart showing a rinsing step.
１０ ろ過膜装置、１１ 膜エレメント、１２ 原水側
ろ過室、１３ 下部配管接続口、１４ 上部配管接続
口、１５ ろ過水側ろ過室、１６ 下部配管接続口、１
７ 上部配管接続口、１８ 小径配管、２０ 洗浄水タ
ンク。２１ａ リンス水タンク。DESCRIPTION OF SYMBOLS 10 Filtration membrane device, 11 Membrane element, 12 Raw water side filtration room, 13 Lower piping connection port, 14 Upper piping connection port, 15 Filtration water filtration room, 16 Lower piping connection port, 1
7 Upper piping connection port, 18 small diameter pipe, 20 washing water tank. 21a Rinse water tank.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 米川 均 愛知県名古屋市瑞穂区須田町２番56号 日 本碍子株式会社内 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Hitoshi Yonekawa 2-56, Suda-cho, Mizuho-ku, Nagoya-shi, Aichi Japan Insulator Co., Ltd.
Claims (4)
を薬品洗浄水にて洗浄処理した後、加圧空気を供給し
て、その加圧空気により前記ろ過膜装置の膜エレメント
に残留している薬品洗浄水を押し出して除去することを
特徴とする洗浄薬品の除去方法。After the inside of a microfiltration membrane device or an ultrafiltration membrane device is washed with a chemical cleaning water, pressurized air is supplied, and the pressurized air leaves the membrane element of the filtration membrane device. A method for removing cleaning chemicals, comprising extruding and removing chemical cleaning water.
留している薬品洗浄水を原水側に押し出して除去する請
求項１に記載の洗浄薬品の除去方法。2. The method for removing a cleaning chemical according to claim 1, wherein the residual chemical cleaning water is extruded from the filtration side to the raw water side by the pressurized air and removed.
品洗浄水タンクに返送し、回収する請求項１または２に
記載の洗浄薬品の除去方法。3. The method for removing a cleaning chemical according to claim 1, wherein the chemical cleaning water removed from the filtration membrane device is returned to the chemical cleaning water tank and collected.
ろ過膜装置または限外ろ過膜装置内をリンス水により洗
浄し、次いで加圧空気を供給して、その加圧空気により
前記ろ過膜装置の膜エレメントに残留しているリンス水
を押し出して除去することを特徴とする請求項１または
２または３に記載の洗浄薬品の除去方法。4. The microfiltration membrane device or the ultrafiltration membrane device washed with the chemical washing water is rinsed with rinsing water, and then pressurized air is supplied. 4. The method according to claim 1, wherein rinsing water remaining in the membrane element is extruded and removed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7910198A JP2945894B2 (en) | 1997-05-16 | 1998-03-26 | How to remove cleaning chemicals |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12691597 | 1997-05-16 | ||
| JP9-126915 | 1997-05-16 | ||
| JP7910198A JP2945894B2 (en) | 1997-05-16 | 1998-03-26 | How to remove cleaning chemicals |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH1128339A true JPH1128339A (en) | 1999-02-02 |
| JP2945894B2 JP2945894B2 (en) | 1999-09-06 |
Family
ID=26420175
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7910198A Expired - Lifetime JP2945894B2 (en) | 1997-05-16 | 1998-03-26 | How to remove cleaning chemicals |
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| Country | Link |
|---|---|
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