JPH038405A - Method for precoat filtration in precoat filter - Google Patents
Method for precoat filtration in precoat filterInfo
- Publication number
- JPH038405A JPH038405A JP1142127A JP14212789A JPH038405A JP H038405 A JPH038405 A JP H038405A JP 1142127 A JP1142127 A JP 1142127A JP 14212789 A JP14212789 A JP 14212789A JP H038405 A JPH038405 A JP H038405A
- Authority
- JP
- Japan
- Prior art keywords
- ion exchange
- filtration
- filter aid
- weakly acidic
- filter
- 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.)
- Pending
Links
- 238000001914 filtration Methods 0.000 title claims abstract description 76
- 238000000034 method Methods 0.000 title description 8
- 230000002378 acidificating effect Effects 0.000 claims abstract description 38
- NWUYHJFMYQTDRP-UHFFFAOYSA-N 1,2-bis(ethenyl)benzene;1-ethenyl-2-ethylbenzene;styrene Chemical compound C=CC1=CC=CC=C1.CCC1=CC=CC=C1C=C.C=CC1=CC=CC=C1C=C NWUYHJFMYQTDRP-UHFFFAOYSA-N 0.000 claims abstract description 37
- 239000003456 ion exchange resin Substances 0.000 claims abstract description 37
- 229920003303 ion-exchange polymer Polymers 0.000 claims abstract description 37
- 239000000835 fiber Substances 0.000 claims abstract description 26
- 238000005342 ion exchange Methods 0.000 claims abstract description 24
- 239000012535 impurity Substances 0.000 claims abstract description 21
- 239000000203 mixture Substances 0.000 claims abstract description 11
- 150000001768 cations Chemical class 0.000 claims abstract description 7
- 239000004952 Polyamide Substances 0.000 claims abstract description 4
- 150000001450 anions Chemical class 0.000 claims abstract description 4
- 229920002647 polyamide Polymers 0.000 claims abstract description 4
- 150000002500 ions Chemical class 0.000 claims abstract description 3
- 239000011550 stock solution Substances 0.000 claims description 16
- 239000000243 solution Substances 0.000 claims description 7
- 125000002843 carboxylic acid group Chemical group 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 4
- 239000011248 coating agent Substances 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- 239000000843 powder Substances 0.000 claims description 3
- 239000011159 matrix material Substances 0.000 claims description 2
- 239000002699 waste material Substances 0.000 abstract description 9
- 239000000463 material Substances 0.000 abstract description 3
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 abstract 2
- 230000002035 prolonged effect Effects 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 16
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- MYRTYDVEIRVNKP-UHFFFAOYSA-N 1,2-Divinylbenzene Chemical compound C=CC1=CC=CC=C1C=C MYRTYDVEIRVNKP-UHFFFAOYSA-N 0.000 description 2
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 2
- 229930194909 coatline Natural products 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000001771 impaired effect Effects 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000008400 supply water Substances 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 1
- 238000007596 consolidation process Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000011017 operating method Methods 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000005201 scrubbing Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Landscapes
- Filtration Of Liquid (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、イオン交換樹脂をプレコートした濾過方法に
関し、特に原子力発電所で用いられるプレコート式の濾
過方法において、使用済の濾過助材廃棄物を効率的に処
理できる濾過方法に関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a filtration method pre-coated with an ion exchange resin, and in particular, in a pre-coat type filtration method used in nuclear power plants, used filter aid waste is The present invention relates to a filtration method that can efficiently process.
従来原子力発電所で使用されている水に含まれる懸濁状
・イオン状不純物の除去には、濾過助材として強酸性粉
末イオン交換樹脂と強塩基性粉末イオン交換樹脂を混合
して用いるプレコート式濾過方法が用いられている。To remove suspended and ionic impurities contained in water that is conventionally used in nuclear power plants, a pre-coat method is used that uses a mixture of strongly acidic powdered ion exchange resin and strongly basic powdered ion exchange resin as filter aids. Filtration methods are used.
この強酸性粉末イオン交換樹脂、強塩基性粉末イオン交
換樹脂を混合し濾過助材として用いるプレコート式濾過
方法では、懸濁状・イオン状不純物をよく除去でき水質
の向上に効果があるが、使用済の濾過助材が廃棄物とし
て発生する。This pre-coat filtration method, which uses a mixture of strongly acidic powdered ion exchange resin and strongly basic powdered ion exchange resin as a filter aid, can effectively remove suspended and ionic impurities and is effective in improving water quality. Used filter aid is generated as waste.
〔発明が解決しようとする課題］
本発明の目的は廃棄物の発生量を低減するため、濾過寿
命の長いプレコート濾過方法を提供することにある。[Problems to be Solved by the Invention] An object of the present invention is to provide a precoat filtration method with a long filtration life in order to reduce the amount of waste generated.
本発明は、濾過助材として、ポリアミド母材に交換基と
し、てカルボン酸基を持つ弱酸性イオン交換繊維及び交
換基としてカルボン酸基を持つ弱酸性粉末イオン交換樹
脂からなるカチオン交換体と、強塩基性粉末イオン交換
樹脂からなるアニオン交換体とを用い、これらのイオン
交換体の混合物の濾過助材を一定低濃度で濾過エレメン
ト上にプレコートし、その層の外側から内側に原液を通
液することにより、原液中の不純物を除去することを特
徴とするプレコート式濾過方法である。The present invention provides, as a filter aid, a cation exchanger consisting of a weakly acidic ion exchange fiber having a carboxylic acid group as an exchange group in a polyamide matrix and a weakly acidic powder ion exchange resin having a carboxylic acid group as an exchange group; Using an anion exchanger made of a strongly basic powdered ion exchange resin, a filter aid made of a mixture of these ion exchangers is pre-coated on the filtration element at a constant low concentration, and the undiluted solution is passed from the outside to the inside of the layer. This is a pre-coat type filtration method characterized by removing impurities in the stock solution.
そして、強酸性粉末イオン交換樹脂の代りに、弱酸性粉
末イオン交換樹脂と及び弱酸性イオン交換繊維とを適切
な比率で混合して用いると、従来の強酸性粉末イオン交
換樹脂と比べて、濾過除去率は同等で、濾過寿命が長く
なり、濾過性能を損わずに発生廃棄物量を低減できた。When a weakly acidic powdered ion exchange resin and a weakly acidic ion exchange fiber are mixed in an appropriate ratio instead of the strongly acidic powdered ion exchange resin, the filtration is improved compared to the conventional strong acidic powdered ion exchange resin. The removal rate was the same, the filtration life was extended, and the amount of waste generated was reduced without compromising filtration performance.
従って、本発明の、従来の強酸性粉末イオン交換樹脂の
代りに弱酸性粉末イオン交換樹脂及び弱酸性イオン交換
繊維とを強塩基性粉末イオン交換樹脂と適切に混合して
濾過助材として用いるプリコート濾過方法を行えば、従
来品と比べ濾過除去性は同等で、濾過寿命は長くなり発
生廃棄物量は低減できるものである。Therefore, the precoat of the present invention is used as a filter aid by appropriately mixing a weakly acidic powdered ion exchange resin and a weakly acidic ion exchange fiber with a strong basic powdered ion exchange resin instead of the conventional strongly acidic powdered ion exchange resin. If the filtration method is used, the filtration removability is equivalent to that of conventional products, the filtration life is extended, and the amount of waste generated can be reduced.
以下に本発明を詳しく述べる。The present invention will be described in detail below.
弱酸性イオン交換繊維は、ポリアミドを母材として交換
基としてカルボン酸基を有するアクリル酸を付加したも
のである。この繊維の径は１０〜５０μｍが適切である
。径がこれ以上であると、濾過助材層をエレメント上に
成した時、濾過助材間の空隙が大きくなって、濾過除去
性が損われる。また径がこれ以下であると、濾過助材間
の空隙が小さくなりすぎ、濾過除去性は良いが濾過寿命
が短くなる。The weakly acidic ion-exchange fiber is made of polyamide as a base material to which acrylic acid having a carboxylic acid group is added as an exchange group. The diameter of this fiber is suitably 10 to 50 μm. If the diameter is larger than this, when a filter aid layer is formed on the element, the voids between the filter aids become large, impairing filtration removability. Moreover, if the diameter is less than this, the voids between the filter aids become too small, and although the filtration removability is good, the filtration life is shortened.
また長さは１００〜５００μｍが適切である。Further, the appropriate length is 100 to 500 μm.
長さがこれ以上であると濾過助材間の空隙が大きくなり
濾過除去性が損われる。長さがこれ以下であると、濾過
助材間の空隙が小さくなり、濾過除去性は良いが濾過寿
命が短くなる。If the length is longer than this, the voids between the filter aids will become large and the filtration removability will be impaired. When the length is less than this, the voids between the filter aids become small, and although the filtration removability is good, the filtration life is shortened.
また弱酸性粉末イオン交換樹脂は、アクリル酸とジビニ
ルベンゼンの重合体で、交換基としてカルボン酸基を有
するものである。平均粒径は５０〜１００μｍが適切で
ある。粒径がこれ以上では濾過助材間の空隙が大きくな
り濾過除去−性が損われる。これ以下では、濾過助材間
の空隙が小さくなり濾過除去性は良いが濾過寿命が短く
なる。The weakly acidic powder ion exchange resin is a polymer of acrylic acid and divinylbenzene, and has a carboxylic acid group as an exchange group. A suitable average particle size is 50 to 100 μm. If the particle size is larger than this, the voids between the filter aids become large and the filtration removability is impaired. If it is less than this, the voids between the filter aids become small and the filtration removability is good, but the filtration life is shortened.
次に、濾過助材であるカチオン交換体とアニオン交換体
とを混合する条件について述べる。Next, conditions for mixing the cation exchanger and anion exchanger, which are filter aids, will be described.
まず弱酸性カチオン交換体と強塩基性粉末イオン交換樹
脂とを混合するには、弱酸性イオン交換繊維と強塩基性
粉末イオン交換樹脂とだけを混合する場合がある。この
場合弱酸性イオン交換ｍ維の持つイオン交換能力は弱酸
性粉末イオン交換樹脂と比べて小さいため、懸濁状不純
物の濾過除去性は従来品と同等でも、イオン状不純物の
除去性が少ない。First, in order to mix a weakly acidic cation exchanger and a strongly basic powdered ion exchange resin, only the weakly acidic ion exchange fiber and the strongly basic powdered ion exchange resin may be mixed. In this case, the ion exchange capacity of the weakly acidic ion exchange m-fiber is smaller than that of the weakly acidic powdered ion exchange resin, so even though the ability to filter suspended impurities is the same as that of conventional products, the ability to remove ionic impurities is low.
次に、弱酸性粉末イオン交換樹脂と強塩基性粉末イオン
交換樹脂とだけを混合する場合もあるが、この場合繊維
がないため、濾過運転の後半で、濾過助材層の圧密によ
る割れが生じやすく、濾過除去性が濾過運転の後半で低
下する。Next, there are cases where only a weakly acidic powdered ion exchange resin and a strongly basic powdered ion exchange resin are mixed, but in this case, since there are no fibers, cracks occur due to consolidation of the filter aid layer in the latter half of the filtration operation. filtration removability decreases in the latter half of filtration operation.
また弱酸性粉末イオン交換樹脂と強塩基性粉末イオン交
換樹脂に交換基を持たない繊維を混合する場合があるが
、繊維がイオン交換能力を有さないため、イオン状不純
物の除去性が少ない。Furthermore, fibers having no exchange groups are sometimes mixed with the weakly acidic powdered ion exchange resin and the strongly basic powdered ion exchange resin, but since the fibers do not have ion exchange ability, the ability to remove ionic impurities is low.
これに対し、本発明では、弱酸性イオン交換繊維と弱酸
性粉末イオン交換樹脂と強塩基性粉末イオン交換樹脂の
３種を混合して濾過助材として用いる。このうちカチオ
ン交換体は、水中に多く含まれる鉄の不純物の除去のた
めに乾燥重量で全濾過助材の５０〜９５％が良好である
。In contrast, in the present invention, a mixture of three types of weakly acidic ion exchange fibers, weakly acidic powdered ion exchange resin, and strongly basic powdered ion exchange resin is used as a filter aid. Among these, the cation exchanger preferably accounts for 50 to 95% of the total filter aid by dry weight in order to remove iron impurities that are often contained in water.
またイオン交換繊維の割合が多いと濾過除去性が低下す
る、逆にその割合が少ないと、濾過助材層を圧密するた
め、イオン交換繊維の割合は乾燥重量で全濾過助材の２
０〜４０％が良好である。In addition, if the proportion of ion exchange fibers is high, the filtration removability will decrease, and conversely, if the proportion is small, the filter aid layer will be compacted, so the proportion of ion exchange fibers should be 2% of the total filter aid material in terms of dry weight.
0 to 40% is good.
前記の本発明による弱酸性イオン交換ｕＶｉ維と弱酸性
粉末イオン交換樹脂と強塩基性粉末イオン交換樹脂の３
種を混合した濾過助材を用いて濾過を行うと、従来使用
している強酸性粉末イオン交換樹脂と強塩基性粉末イオ
ン交換樹脂とを混合した濾過助材と比較して、原液中の
不純物の除去性能は同等で、濾過寿命を１．５〜２倍に
長寿命とすることができる。3 of the weakly acidic ion exchange uVi fiber, weakly acidic powdered ion exchange resin, and strongly basic powdered ion exchange resin according to the present invention.
When filtration is performed using a filter aid mixed with seeds, impurities in the stock solution are reduced compared to the conventionally used filter aid mixed with a strongly acidic powdered ion exchange resin and a strongly basic powdered ion exchange resin. The removal performance is the same, and the filtration life can be extended by 1.5 to 2 times.
また、本発明による３種の混合した濾過助材をプリコー
トして原液をその層の外側がら内側に通液して原液中の
不純物を除去する際、原液中に、本発明による３種の混
合した濾過助材：あるいは本発明による弱酸性イオン交
換繊維を原液中に注入しながらろ過を行うことによって
濾過寿命は更に延長することができる。これは、原液中
に濾過助材と不純物が含まれるため、濾過すると不純物
が濾過助材と混合されて濾過され、表面濾過になりにく
く濾過差圧の上昇がゆるやかで寿命が延長されるからで
ある。In addition, when precoating a mixed filter aid of the three types according to the present invention and passing the stock solution from the outside to the inside of the layer to remove impurities in the stock solution, the three types of filter aids according to the present invention may be mixed in the stock solution. The filtration life can be further extended by performing filtration while injecting the filter aid: or the weakly acidic ion exchange fiber according to the present invention into the stock solution. This is because the undiluted solution contains filter aids and impurities, so when filtered, the impurities are mixed with the filter aids and filtered, making it difficult for surface filtration to occur and the filtration differential pressure to rise slowly, extending the service life. be.
原液を濾過中に注入する濾過助材の濃度は、原液中の不
純物濃度の１〜１０倍が良く、更に２〜５倍が好ましい
。The concentration of the filter aid injected during filtration of the stock solution is preferably 1 to 10 times, more preferably 2 to 5 times, the concentration of impurities in the stock solution.
また、本発明による３種の混合した濾過助材をプリコー
トして原液をその層の外側から内側に通液して原液中の
不純物を除去し、その後通液を停止し、再び前記濾過助
材あるいは本発明による弱酸性イオン交換繊維をプリコ
ートしまた原液を通液して濾過を行うことによって濾過
寿命は延長することができる。プリコート式濾過では、
濾過の初期は濾過助材層の内部で不純物が濾過される体
積濾過であるが、濾過が進むと濾過助材層の表面で濾過
される表面濾過となり、この時濾過差圧の上昇が大きく
なる。前記の方法で濾過をすると、表面濾過となる前に
、新たな濾過助材層がプリコートされるため体積濾過の
効果が発揮されて寿命を延長することができる。In addition, a mixed filter aid of three types according to the present invention is precoated, and the stock solution is passed from the outside to the inside of the layer to remove impurities in the stock solution, and then the flow is stopped and the filter aid is reused. Alternatively, the filtration life can be extended by precoating the weakly acidic ion exchange fiber according to the present invention and filtering by passing the undiluted solution through the fiber. In precoat type filtration,
At the beginning of filtration, impurities are filtered inside the filter aid layer, which is volumetric filtration, but as filtration progresses, it becomes surface filtration, where impurities are filtered on the surface of the filter aid layer, and at this time, the filtration differential pressure increases significantly. . When filtration is performed using the above method, a new filter aid layer is pre-coated before surface filtration, so the effect of volumetric filtration is exhibited and the service life can be extended.
再び濾過助材をプリコートする時期は、濾過差圧が通液
初期の値より、０．１ ｋｇ ／ ｃｍ２程度上昇した
時期がよく、また再び濾過助材をプリコートする際の看
は、濾過面積１ ｍ’当り０．２〜０、４ ｋｇ −Ｄ
ｒｙがよい。また再び濾過助材をプリコートする回数は
、多数回程、寿命延長されるが操作が煩雑となるため１
〜２回が好ましい。The best time to pre-coat the filter aid again is when the filtration differential pressure has risen by about 0.1 kg/cm2 from the value at the beginning of fluid flow, and when pre-coating the filter aid again, the filtration area 1 0.2-0.4 kg-D per m'
ry is good. In addition, the number of times to pre-coat the filter aid again is many times, which will extend the service life, but the operation will be complicated.
~2 times is preferred.
以下に、本発明を図面を用いて具体的に説明するが、本
発明はこれらの実施例に限定されるものではない。The present invention will be specifically explained below using the drawings, but the present invention is not limited to these examples.
第１図は、本発明の濾過方法を示した工程図であり、こ
の工程図に基づいて運転方法を説明する。FIG. 1 is a process diagram showing the filtration method of the present invention, and the operating method will be explained based on this process diagram.
濾過助材供給タンク４に濾過助材を入れて、攪拌機９で
混合する。５のプレコートポンプを起動し、プレコート
タンク３．５、濾過器１のプレコートラインに通液する
。濾過助材供給水ライン１３より駆動水を通液し、４よ
り６のエゼクタで濾過助材を一定低濃度でプレコートラ
インに注入し、ｌの中に設置された濾過エレメント２に
プレコートする。プレコート完了後２２のポンプを起動
し保持ラインに通液し、その後プレコートを停止する。The filter aid is put into the filter aid supply tank 4 and mixed with the stirrer 9. Start the pre-coat pump No. 5 and flow the liquid to the pre-coat tank 3.5 and the pre-coat line of the filter 1. Driving water is passed through the filtration aid supply water line 13, and the filtration aid is injected into the precoat line at a constant low concentration using ejectors 4 to 6 to precoat the filtration element 2 installed in the filtration element 2. After the precoating is completed, the pump 22 is started to supply liquid to the holding line, and then the precoating is stopped.
被処理水人口１１．１、被処理水出口１２で被処理水を
通液し、２２のポンプを停止し保持ラインを停止し、濾
過をする。濾過差圧が規定の１．７５ ｋｇ ／ ｃｍ
２となったら２２のポンプを起動し、１１．１２をとめ
る。■の上部に空気人口１７から空気を導入しドームド
レン１８から水を排出する。排出が終ったら１８を閉め
、１の上部に空気を圧力が６〜７ｋｇ／ｃｍ’Ｇとなる
まで貯める。空気が貯ったら逆洗出口２０を開は使用済
の濾過助材を空気で逆洗排出する。その後、管板ベント
１９を生かし２４から洗浄水を入れながら、空気人口２
１から空気でスクラビングして濾過エレメントを洗浄す
る。洗浄水が一杯となったら、再び１の上部から空気を
入れ、この空気で逆洗排出して洗浄する。その後１の中
を満水として次サイクルの濾過運転をする。To-be-treated water population 11.1, to-be-treated water is passed through the to-be-treated water outlet 12, the pump 22 is stopped, the holding line is stopped, and filtration is performed. The specified filtration differential pressure is 1.75 kg/cm
When it reaches 2, start pump 22 and stop pump 11.12. Air is introduced from the air port 17 into the upper part of (2), and water is discharged from the dome drain 18. When the discharge is finished, close 18 and store air in the upper part of 1 until the pressure reaches 6 to 7 kg/cm'G. When air accumulates, the backwash outlet 20 is opened to backwash and discharge the used filter aid with air. After that, make use of the tube plate vent 19 and pour in cleaning water from 24, while
Clean the filter element by scrubbing with air from step 1. When the washing water is full, air is again introduced from the top of No. 1, and this air is used to backwash and discharge the water for washing. After that, fill the inside of 1 with water and perform the next cycle of filtration operation.
実施例１ 前記の工程図に従って運転した実施テスト例を示す。Example 1 An example of a test carried out according to the process diagram described above is shown.
不純物は実プラントを模擬した鉄クラツドを人口濃度（
Ｆｅ基準）で２〜３ ｐｐｍ注入した。Impurities are measured at population concentration (
2 to 3 ppm (Fe standard) was injected.
また、濾過寿命（通水差圧が１．７５ ｋｇ ／ ｃｍ
２となるまでの鉄捕捉量）、鉄除去率は、強酸性粉末イ
オン交換樹脂を使用した場合の結果を表１として示した
。In addition, the filtration life (water flow differential pressure is 1.75 kg/cm
Table 1 shows the results for the iron removal rate when a strongly acidic powdered ion exchange resin was used.
表 １
〔発明の効果〕
前記したように、本発明の弱酸性イオン交換繊維、弱酸
性粉末イオン交換樹脂、及び強塩基粉末イオン交換樹脂
とを混合して用いるプリコート濾過方法を行えば、従来
と比べ、濾過除去性は同等で、濾過寿命は長くなり発生
廃棄物量は低減できる。更に発生した廃棄物はＳＯＸを
生じずに焼却減容することができる。Table 1 [Effects of the Invention] As described above, if the precoat filtration method using a mixture of the weakly acidic ion exchange fiber, weakly acidic powdered ion exchange resin, and strong basic powdered ion exchange resin of the present invention is carried out, the filtration method is superior to that of the conventional method. In comparison, the filtration removability is the same, the filtration life is longer, and the amount of waste generated can be reduced. Furthermore, the generated waste can be reduced in volume by incineration without producing SOX.
第１図は、本発明の工程図を示す。 １ 濾過器 ２ エレメント ３ プレコートタンク ４ 濾過助材供給タンク ５ プレコートポンプ ６ エゼクタ ？ 流量計 ８ 流量計 ９ 攪拌機 １０ 差圧計 被処理水入口 被処理水出口 濾過助材供給水ライ ブレコードライン プレコートライン ベント 空気入口 ドームドレン 管板ベント 逆洗出口 空気人口 保持ポンプ 保持ライン 洗浄水ライン ン FIG. 1 shows a process diagram of the present invention. 1 Filter 2 Element 3 Pre-coat tank 4 Filter aid supply tank 5 Precoat pump 6 Ejector ? Flowmeter 8 Flow meter 9 Stirrer 10 Differential pressure gauge Treated water inlet Treated water outlet Filter aid supply water line break record line pre-coat line Bento air inlet dome drain tubesheet vent backwash outlet air population holding pump holding line wash water line hmm
Claims (1)
ルボン酸基を持つ弱酸性イオン交換繊維及び交換基とし
てカルボン酸基を持つ弱酸性粉末イオン交換樹脂からな
るカチオン交換体と、強塩基性粉末イオン交換樹脂から
なるアニオン交換体とを用い、これらのイオン交換体の
混合物の濾過助材を一定低濃度で濾過エレメント上にプ
レコートし、その層の外側から内側に原液を通液するこ
とにより原液中の不純物を除去することを特徴とするプ
レコート式濾過方法。 ２、濾過助材の弱酸性イオン交換繊維は、繊維の径が１
０〜５０μｍで、長さが１００〜５００μｍであること
を特徴とする請求項１記載のプレコート式濾過方法。 ３、濾過助材の粉末イオン交換樹脂は、平均粒径が５０
〜１００μｍであることを特徴とする請求項１又は２記
載のプレコート式濾過方法。 ４、濾過助材は、カチオン交換体の占める割合が乾燥重
量換算で５０〜９５％であり、かつ、イオン交換繊維の
占める割合は乾燥重量換算で２０〜４０％であることを
特徴とする請求項１〜３のいずれか１項に記載のプレコ
ート式濾過方法。 ５、請求項１〜４の混合物の濾過助材を一定低濃度で濾
過エレメント上にプレコートし、その後原液中に請求項
１の弱酸性イオン交換繊維あるいは請求項１の混合物の
濾過助材を注入しながら、その層の外側から内側に原液
を濾過して、原液中の不純物を除去することを特徴とす
るプレコート式濾過方法。 ６、請求項１〜４の混合物の濾過助材を一定低濃度で濾
過エレメント上にプレコートし、その層の外側から内側
に原液を通液して、原液中の不純物を除去し、その後通
液を止めて更に前記濾過助材あるいは弱酸性イオン交換
繊維をプリコートし、再び原液を通液して原液中の不純
物を除去することを特徴とするプレコート式濾過方法。[Claims] 1. As a filter aid, a cation exchanger consisting of a weakly acidic ion exchange fiber having a carboxylic acid group as an exchange group in a polyamide matrix and a weakly acidic powder ion exchange resin having a carboxylic acid group as an exchange group. and an anion exchanger made of a strongly basic powdered ion exchange resin, a filter aid made of a mixture of these ion exchangers is pre-coated on the filtration element at a constant low concentration, and the undiluted solution is applied from the outside to the inside of the layer. A pre-coat filtration method characterized by removing impurities in the stock solution by passing the liquid through it. 2. The weakly acidic ion exchange fiber used as a filter aid has a fiber diameter of 1
The precoat type filtration method according to claim 1, characterized in that the length is 0 to 50 μm and the length is 100 to 500 μm. 3. The powdered ion exchange resin used as a filter aid has an average particle size of 50
The precoat type filtration method according to claim 1 or 2, characterized in that the particle size is 100 μm. 4. A claim characterized in that the filtration aid has a cation exchanger content of 50 to 95% in terms of dry weight, and an ion exchange fiber content of 20 to 40% in terms of dry weight. Item 3. The precoat type filtration method according to any one of Items 1 to 3. 5. Pre-coating the filter aid of the mixture of claims 1 to 4 at a constant low concentration on the filter element, and then injecting the weakly acidic ion exchange fiber of claim 1 or the filter aid of the mixture of claim 1 into the stock solution. A pre-coat type filtration method characterized in that impurities in the stock solution are removed by filtering the stock solution from the outside to the inside of the layer. 6. Pre-coating the filter aid of the mixture of claims 1 to 4 at a constant low concentration on the filter element, passing the stock solution from the outside to the inside of the layer to remove impurities in the stock solution, and then passing the solution through the filter element. A pre-coat type filtration method characterized in that the filtration is stopped, the filter aid or the weakly acidic ion exchange fiber is further precoated, and the undiluted solution is passed through again to remove impurities in the undiluted solution.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1142127A JPH038405A (en) | 1989-06-06 | 1989-06-06 | Method for precoat filtration in precoat filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1142127A JPH038405A (en) | 1989-06-06 | 1989-06-06 | Method for precoat filtration in precoat filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH038405A true JPH038405A (en) | 1991-01-16 |
Family
ID=15308011
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1142127A Pending JPH038405A (en) | 1989-06-06 | 1989-06-06 | Method for precoat filtration in precoat filter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH038405A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008098388A (en) * | 2006-10-12 | 2008-04-24 | Hamanako Denso Co Ltd | Solenoid device and manufacturing method thereof |
-
1989
- 1989-06-06 JP JP1142127A patent/JPH038405A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008098388A (en) * | 2006-10-12 | 2008-04-24 | Hamanako Denso Co Ltd | Solenoid device and manufacturing method thereof |
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