JPH051043B2 - - Google Patents
Info
- Publication number
- JPH051043B2 JPH051043B2 JP61207992A JP20799286A JPH051043B2 JP H051043 B2 JPH051043 B2 JP H051043B2 JP 61207992 A JP61207992 A JP 61207992A JP 20799286 A JP20799286 A JP 20799286A JP H051043 B2 JPH051043 B2 JP H051043B2
- Authority
- JP
- Japan
- Prior art keywords
- filter
- filter aid
- ion exchange
- precoat
- filtration method
- 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.)
- Expired - Fee Related
Links
- 238000001914 filtration Methods 0.000 claims description 25
- 230000002378 acidificating effect Effects 0.000 claims description 14
- 238000005342 ion exchange Methods 0.000 claims description 13
- 239000000835 fiber Substances 0.000 claims description 11
- 239000000843 powder Substances 0.000 claims description 10
- 239000012535 impurity Substances 0.000 claims description 8
- 239000002002 slurry Substances 0.000 claims description 8
- 150000001768 cations Chemical class 0.000 claims description 7
- 239000004952 Polyamide Substances 0.000 claims description 6
- 150000001450 anions Chemical class 0.000 claims description 6
- 125000002843 carboxylic acid group Chemical group 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 6
- 229920002647 polyamide Polymers 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 3
- 239000011347 resin Substances 0.000 claims description 2
- 229920005989 resin Polymers 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 24
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 9
- 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 description 7
- 239000003729 cation exchange resin Substances 0.000 description 7
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 5
- 229910052717 sulfur Inorganic materials 0.000 description 5
- 239000011593 sulfur Substances 0.000 description 5
- 229910052742 iron Inorganic materials 0.000 description 4
- 239000008400 supply water Substances 0.000 description 4
- 239000003957 anion exchange resin Substances 0.000 description 2
- 238000005341 cation exchange Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 239000010426 asphalt Substances 0.000 description 1
- 238000011001 backwashing Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000009924 canning Methods 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000005518 polymer electrolyte Substances 0.000 description 1
- 238000005201 scrubbing Methods 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Landscapes
- Treatment Of Water By Ion Exchange (AREA)
- Filtration Of Liquid (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
Description
〔産業上の利用分野〕
この発明は、水のろ過に用いられるプレコート
式ろ過方法に関し、特に原子力発電所などから出
る排水のろ過に用いられるプレコート式ろ過方法
に関する。
〔従来技術〕
従来原子力発電所で使用され、あるいはそこか
ら排出される水に含まれる懸濁状あるいはイオン
状の不純物の除去には、強酸性カチオン交換樹脂
粉末と強塩基性アニオン交換樹脂粉末を混合して
ろ過助剤として用いるプレコート式ろ過方法が用
いられている。
そして、このろ過助剤でプレコートする際、ろ
過助剤を所定の低濃度のスラリーとしてろ過エレ
メント上にプレコートすれば、高分子電解質を使
用せずに良好なプレコート層を形成することがで
きる。
〔発明が解決しようとする問題点〕
この強酸性カチオン交換樹脂粉末と強塩基性ア
ニオン交換樹脂粉末をろ過助剤として用いるプレ
コート式ろ過方法は、懸濁状あるいはイオン状の
不純物をよく除去でき、水質の向上に効果がある
が使用済みのろ過助剤自身が廃棄物として発生す
る。この使用済みのろ過助剤の処分はアスフアル
ト等で固めてドラム缶詰めとしているが、容積が
大きくなる。また、焼却しようとすると、イオン
交換基に硫黄を含む（−SO3H）型強酸性カチオ
ン交換樹脂粉末からはSOxを発生するため、脱硫
装置等の対硫黄対策が必要であつた。
〔問題点を解決するための手段〕
そこで、この発明は、強酸性カチオン交換樹脂
粉末の代りにポリアミドを母材とし、イオン交換
基としてカルボン酸基を持つ弱酸性イオン交換繊
維をろ過助剤の一成分として用いるようにしたも
のであつて、それによつて、強酸型カチオン交換
樹脂粉末を用いた場合に比べ不純物の除去量が増
大し、かつろ過助剤に硫黄を含まないため簡単に
焼却できるようになつたものである。
すなわち、この発明は、ポリアミドを母材と
し、イオン交換基としてカルボン酸基を持つ弱酸
性イオン交換繊維からなるカチオン交換体、およ
び強塩基性粉末樹脂からなるアニオン交換体をろ
過助剤として使用し、これらの混合物のろ過助剤
を低濃度のスラリーとしたのでろ過エレメント上
にプレコートし、その層の外側から内側に被処理
液を通液することにより被処理液中の不純物を除
去することを特徴とするプレコート式ろ過方法で
ある。
この発明で使用する、ポリアミドを母材とし、
イオン交換基としてカルボン酸基をもつ弱酸性イ
オン交換繊維からなるカチオン交換体は、繊維と
してよく使用されるポリアミドを母材としてお
り、イオン交換基として遊離のカルボン酸基を持
つように変成して得られるもので、弱酸性イオン
交換繊維としては公知のものである。弱酸性イオ
ン交換繊維としては径が10〜50μで、長さが200
〜1000μのものが使用に適し、長さについては好
ましくは300〜500μのものがよい。
ろ過助剤として用いられるカチオン交換体とア
ニオン交換体は、その混合比率が、カチオン交換
体の乾燥重量／アニオン交換体の乾燥重量の比で
１／２〜3/1とするのが好ましい。
また、このろ過助剤をろ過エレメント上にプレ
コートするにさいしてはろ過助剤を所定の低濃度
のスラリーとしてプレコートを行うのがよいが、
そのスラリー濃度はろ過助剤の乾燥重量で0.01〜
0.05重量％とするのが適している。
次に、この発明のプレコート式ろ過方法におけ
るプレコートの形成やろ過の態様を図面によつて
説明する。
ろ過助剤供給タンク４にろ過助剤と水を入れて
かく拌機９でよく混合する。プレコートポンプ５
を起動し、プレコートタンク３からプレコートポ
ンプ５を経てろ過器１に至る流れを生ずる。ろ過
助剤供給水ライン１３から供給水を流し、ろ過助
剤供給タンク４からエゼクタ６によりろ過助剤を
プレコートライン１５に送入して所定の低濃度の
スラリーを形成してろ過器１へ送り、ろ過器１の
ろ過エレメント２の上にプレコートする。８はろ
過助剤供給水の流量を知るための流量計である。
プレコートの完了後、プレコートポンプ５を停止
し、保持ポンプ２２を起動してろ過器１に入り、
さらに保持ポンプ２２へと戻る保持ライン２３の
流れを生じさせ、プレコートを停止する。なお、
保持ライン２３の流れがないとプレコートが剥離
する危険がある。
次いで、被処理水入口１１から被処理水をろ過
器１へ送り、処理水出口１２から処理水を導出す
るようにすると共に、保持ポンプ２２を停止し
て、ろ過の作業を行う。７は処理水の流量を知る
ための流量計である。
ろ過の作業が進むにつれて、不純物がろ過エレ
メント上に堆積するためろ過に要する圧力が増
し、その差圧を差圧計１０で測定するが、その差
圧が1.75Kg/cm3となつたら、保持ポンプ２２を起
動し、被処理水入口１１および処理水出口１２を
止める。
ろ過器１の上部に空気入口１７から空気を導入
し、ドームドレン１８から水を排出する。水の排
出が終つたならばドームドレン１８を閉め、ろ過
器１の上部に空気を圧力が６〜７Kg/cm2となるま
で貯める。空気が貯まつたら、逆洗出口２０を開
け、使用済みのろ過助剤を空気逆洗により排出す
る。その後管板ベンド１９の管路を開け、洗浄水
ライン２４から洗浄水を入れながら、空気入口２
１からの空気によりスクラビングし、ろ過エレメ
ント２を洗浄する。洗浄水がろ過器１中に一杯と
なつたら、再びろ過器１の上部から空気を入れ空
気逆洗して排水する。その後、ろ過器１中を満水
として次サイクルのろ過運転をする。
なお、図面において、１４はプレコートタンク
３に連結するプレコート戻りラインであり、１６
はベントである。
〔実施例〕
ここで、この発明の実施例を表によつて示す
が、この発明はこれに限られるものではない。
なお、不純物として実プラントを模擬した鉄ク
ラツドを、入口濃度（Fe基準）３〜6ppmとして
入れた水を被処理水とした。
また、ろ過寿命、鉄除去率は、強酸性カチオン
交換樹脂粉末を使用した場合の結果を１としたも
のを基準として表わした。
ろ過寿命は通水差圧が1.75Kg/cm2となるまでの
補足鉄量の値で比較した。
測定条件、測定結果を表１に示す。
[Industrial Application Field] The present invention relates to a precoat type filtration method used for water filtration, and particularly to a precoat type filtration method used for filtering wastewater discharged from nuclear power plants and the like. [Prior art] To remove suspended or ionic impurities contained in water conventionally used in or discharged from nuclear power plants, strongly acidic cation exchange resin powder and strongly basic anion exchange resin powder have been used. A precoat type filtration method is used in which the mixture is used as a filter aid. When precoating with this filter aid, if the filter aid is precoated on the filter element as a predetermined low concentration slurry, a good precoat layer can be formed without using a polymer electrolyte. [Problems to be solved by the invention] This pre-coat type filtration method using the strongly acidic cation exchange resin powder and the strongly basic anion exchange resin powder as filter aids can effectively remove suspended or ionic impurities, Although effective in improving water quality, the used filter aid itself is generated as waste. This used filter aid is disposed of by solidifying it with asphalt or the like and canning it in drums, but the volume becomes large. Furthermore, when incineration is attempted, SOx is generated from strongly acidic cation exchange resin powder containing sulfur in the ion exchange group (-SO 3 H), so measures against sulfur, such as a desulfurization device, are required. [Means for Solving the Problems] Therefore, the present invention uses a polyamide as a base material instead of a strongly acidic cation exchange resin powder and uses a weakly acidic ion exchange fiber having a carboxylic acid group as an ion exchange group as a filter aid. It is designed to be used as a single component, and as a result, the amount of impurities removed is increased compared to when a strong acid type cation exchange resin powder is used, and since the filter aid does not contain sulfur, it can be easily incinerated. This is how it came to be. That is, this invention uses as a filter aid a cation exchanger made of a weakly acidic ion exchange fiber having a polyamide base material and a carboxylic acid group as an ion exchange group, and an anion exchanger made of a strongly basic powdered resin. Since the filter aid of these mixtures was made into a low-concentration slurry, it was possible to remove impurities in the liquid to be treated by precoating it on the filtration element and passing the liquid to be treated from the outside to the inside of the layer. This is a unique pre-coat filtration method. The polyamide used in this invention is the base material,
Cation exchangers are made of weakly acidic ion exchange fibers that have carboxylic acid groups as ion exchange groups.The base material is polyamide, which is often used as fibers, and has been modified to have free carboxylic acid groups as ion exchange groups. The obtained fiber is known as a weakly acidic ion exchange fiber. As a weakly acidic ion exchange fiber, the diameter is 10 to 50μ and the length is 200μ.
~1000μ is suitable for use, and the length is preferably 300 to 500μ. The mixing ratio of the cation exchanger and anion exchanger used as a filter aid is preferably 1/2 to 3/1 in terms of dry weight of cation exchanger/dry weight of anion exchanger. In addition, when pre-coating this filter aid onto the filter element, it is better to pre-coat the filter aid as a slurry at a predetermined low concentration.
The slurry concentration is 0.01 to 0.01 based on the dry weight of the filter aid.
A suitable amount is 0.05% by weight. Next, aspects of precoat formation and filtration in the precoat type filtration method of the present invention will be explained with reference to the drawings. A filter aid and water are placed in a filter aid supply tank 4 and mixed well with a stirrer 9. Precoat pump 5
is activated to generate a flow from the precoat tank 3 to the filter 1 via the precoat pump 5. Supply water is flowed from the filter aid supply water line 13, and the filter aid is sent from the filter aid supply tank 4 to the precoat line 15 by the ejector 6 to form a predetermined low concentration slurry and sent to the filter 1. , pre-coated on the filter element 2 of the filter 1. 8 is a flow meter for determining the flow rate of the filter aid supply water.
After the precoating is completed, the precoat pump 5 is stopped, the holding pump 22 is started, and the filter 1 is entered.
Furthermore, flow is generated in the holding line 23 back to the holding pump 22, and precoating is stopped. In addition,
If the holding line 23 does not flow, there is a risk that the precoat will peel off. Next, the water to be treated is sent to the filter 1 from the water inlet 11, and the water is led out from the outlet 12, and the holding pump 22 is stopped to perform the filtration work. 7 is a flow meter for determining the flow rate of treated water. As the filtration process progresses, the pressure required for filtration increases as impurities accumulate on the filtration element, and the differential pressure is measured with the differential pressure gauge 10. When the differential pressure reaches 1.75Kg/ cm3 , the holding pump 22, and stop the treated water inlet 11 and treated water outlet 12. Air is introduced into the upper part of the filter 1 from an air inlet 17, and water is discharged from a dome drain 18. When the water has been discharged, the dome drain 18 is closed and air is stored in the upper part of the filter 1 until the pressure reaches 6 to 7 kg/cm 2 . Once the air has accumulated, the backwash outlet 20 is opened and the used filter aid is discharged by air backwashing. After that, open the pipe line of the tube plate bend 19, and while pouring washing water from the washing water line 24, the air inlet 2
The filter element 2 is cleaned by scrubbing with the air from the filter element 1. When the filter 1 is full of wash water, air is again introduced from the top of the filter 1 to backwash the water and drain the water. Thereafter, the filter 1 is filled with water for the next cycle of filtration operation. In the drawing, 14 is a precoat return line connected to the precoat tank 3, and 16 is a precoat return line connected to the precoat tank 3.
is a vent. [Examples] Here, examples of the present invention are shown in the form of tables, but the present invention is not limited thereto. The water to be treated was water into which iron cladding, which simulated an actual plant, was added as an impurity at an inlet concentration (Fe standard) of 3 to 6 ppm. In addition, the filtration life and iron removal rate were expressed based on the results obtained when a strongly acidic cation exchange resin powder was used as 1. Filtration life was compared based on the amount of supplementary iron required until the water flow differential pressure reached 1.75Kg/cm 2 . Table 1 shows the measurement conditions and measurement results.
この発明では、ろ過助剤の一種に従来の強酸性
カチオン交換樹脂粉末の代りに、ポリアミドを母
材とし、カルボン酸基を交換基とした弱酸性カチ
オン交換繊維を用いることによつて、処理水の不
純物のリーク量は同等に維持しながらろ過寿命を
長くすることができる。また、このカチオン交換
繊維は硫黄を含まないから、硫黄対策を要しない
で燃焼することができ、最終廃棄物量を低減でき
るものである。そして、ろ過寿命が長くなること
により全体の鉄除去量もそれに比例して1.2〜2.6
倍と増える。
In this invention, instead of the conventional strongly acidic cation exchange resin powder as a type of filter aid, weakly acidic cation exchange fibers made of polyamide as a base material and having carboxylic acid groups as exchange groups are used to improve the efficiency of treated water. It is possible to extend the filtration life while maintaining the same amount of impurity leakage. Furthermore, since this cation exchange fiber does not contain sulfur, it can be burned without requiring any measures against sulfur, thereby reducing the amount of final waste. And, as the filtration life becomes longer, the overall amount of iron removed is proportionally increased by 1.2 to 2.6
It increases twice.
第１図は、この発明を実施するのに用いる装置
の一例を示したものである。
１：ろ過器、２：ろ過エレメント、３：プレコ
ートタンク、４：ろ過助剤供給タンク、５：プレ
コートポンプ、６：エゼクタ、９：撹拌機、１
１：被処理水入口、１２：処理水出口、１３：ろ
過助剤供給水ライン、１５：プレコートライン。
FIG. 1 shows an example of an apparatus used to carry out the invention. 1: Filter, 2: Filtration element, 3: Precoat tank, 4: Filter aid supply tank, 5: Precoat pump, 6: Ejector, 9: Stirrer, 1
1: Treated water inlet, 12: Treated water outlet, 13: Filter aid supply water line, 15: Precoat line.
Claims (1)
カルボン酸基を持つ弱酸性イオン交換繊維からな
るカチオン交換体、および強塩基性樹脂粉末から
なるアニオン交換体をろ過助剤として使用し、こ
れらの混合物のろ過助剤を低濃度のスラリーとし
たものでろ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被処理液を通液することによ
り被処理液中の不純物を除去することを特徴とす
るプレコート式ろ過方法。 ２ 弱酸性イオン交換繊維が径が10〜50μで、長
さが200〜1000μで、好ましくは長さが300〜500μ
であるものからなる特許請求の範囲第１項記載の
プレコート式ろ過方法。 ３ カチオン交換体とアニオン交換体との混合比
率が、カチオン交換体の乾燥重量／アニオン交換
体の乾燥重量の比で1/2〜3/1とすることからなる
特許請求の範囲第１項記載のプレコート式ろ過方
法。 ４ ろ過エレメント上にプレコートするさいのろ
過助剤のスラリー濃度は、スラリー中のろ過助剤
が乾燥重量で0.01〜0.05重量％とすることからな
る特許請求の範囲第１項記載のプレコート式ろ過
方法。[Claims] 1. A cation exchanger made of a weakly acidic ion exchange fiber having a polyamide base material and a carboxylic acid group as an ion exchange group, and an anion exchanger made of a strong basic resin powder are used as filter aids. Then, a low-concentration slurry of a filter aid mixture of these is pre-coated on the filtration element, and impurities in the liquid to be treated are removed by passing the liquid from the outside to the inside of this layer. A pre-coat filtration method characterized by: 2 Weakly acidic ion exchange fibers have a diameter of 10 to 50μ, a length of 200 to 1000μ, preferably a length of 300 to 500μ
The precoat type filtration method according to claim 1, comprising: 3. Claim 1, wherein the mixing ratio of the cation exchanger and the anion exchanger is 1/2 to 3/1 in terms of dry weight of cation exchanger/dry weight of anion exchanger. Pre-coated filtration method. 4. The precoat type filtration method according to claim 1, wherein the slurry concentration of the filter aid when precoating on the filter element is 0.01 to 0.05% by dry weight of the filter aid in the slurry. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61207992A JPS6365923A (en) | 1986-09-05 | 1986-09-05 | Precoating type filtration |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61207992A JPS6365923A (en) | 1986-09-05 | 1986-09-05 | Precoating type filtration |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6365923A JPS6365923A (en) | 1988-03-24 |
| JPH051043B2 true JPH051043B2 (en) | 1993-01-07 |
Family
ID=16548883
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61207992A Granted JPS6365923A (en) | 1986-09-05 | 1986-09-05 | Precoating type filtration |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6365923A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100306886B1 (en) * | 1992-09-16 | 2002-12-06 | 트리오신 코포레이션 | Iodine / resin disinfectant and its manufacturing method |
| US6680050B1 (en) | 1992-09-16 | 2004-01-20 | Triosyn Holdings, Inc. | Iodine/resin disinfectant and a procedure for the preparation thereof |
-
1986
- 1986-09-05 JP JP61207992A patent/JPS6365923A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6365923A (en) | 1988-03-24 |
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