JPS62294484A - Reverse osmosis treatment of water containing silica at high concentration - Google Patents
Reverse osmosis treatment of water containing silica at high concentrationInfo
- Publication number
- JPS62294484A JPS62294484A JP61138486A JP13848686A JPS62294484A JP S62294484 A JPS62294484 A JP S62294484A JP 61138486 A JP61138486 A JP 61138486A JP 13848686 A JP13848686 A JP 13848686A JP S62294484 A JPS62294484 A JP S62294484A
- Authority
- JP
- Japan
- Prior art keywords
- reverse osmosis
- water
- stage
- silica
- osmosis treatment
- 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
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 76
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 title claims abstract description 74
- 238000001223 reverse osmosis Methods 0.000 title claims abstract description 74
- 238000011282 treatment Methods 0.000 title claims abstract description 41
- 239000000377 silicon dioxide Substances 0.000 title claims abstract description 37
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 12
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims abstract description 4
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims abstract description 4
- 239000011575 calcium Substances 0.000 claims abstract description 4
- 229910052791 calcium Inorganic materials 0.000 claims abstract description 4
- 239000011777 magnesium Substances 0.000 claims abstract description 4
- 229910052749 magnesium Inorganic materials 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 18
- 239000012528 membrane Substances 0.000 claims description 13
- 238000001556 precipitation Methods 0.000 claims description 8
- 239000002455 scale inhibitor Substances 0.000 claims description 7
- 239000002253 acid Substances 0.000 abstract description 10
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 abstract description 8
- 238000003860 storage Methods 0.000 abstract description 6
- 239000001569 carbon dioxide Substances 0.000 abstract description 4
- 229910002092 carbon dioxide Inorganic materials 0.000 abstract description 4
- 239000003513 alkali Substances 0.000 abstract description 3
- 239000010802 sludge Substances 0.000 abstract description 3
- 238000007872 degassing Methods 0.000 abstract 1
- 238000011033 desalting Methods 0.000 abstract 1
- 238000011084 recovery Methods 0.000 description 14
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 9
- 238000002347 injection Methods 0.000 description 8
- 239000007924 injection Substances 0.000 description 8
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 6
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 6
- 150000002500 ions Chemical class 0.000 description 5
- 230000007704 transition Effects 0.000 description 5
- 239000000047 product Substances 0.000 description 4
- 229910000019 calcium carbonate Inorganic materials 0.000 description 3
- 235000011121 sodium hydroxide Nutrition 0.000 description 3
- 229920000388 Polyphosphate Polymers 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 2
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 2
- 238000006114 decarboxylation reaction Methods 0.000 description 2
- 239000001205 polyphosphate Substances 0.000 description 2
- 235000011176 polyphosphates Nutrition 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 241000975357 Salangichthys microdon Species 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical class [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 239000001506 calcium phosphate Substances 0.000 description 1
- 229910000389 calcium phosphate Inorganic materials 0.000 description 1
- 235000011010 calcium phosphates Nutrition 0.000 description 1
- 238000000975 co-precipitation Methods 0.000 description 1
- 238000005261 decarburization Methods 0.000 description 1
- 238000010612 desalination reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003651 drinking water Substances 0.000 description 1
- 235000020188 drinking water Nutrition 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000008235 industrial water Substances 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 159000000003 magnesium salts Chemical class 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 238000010979 pH adjustment Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 238000005325 percolation Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 229910001415 sodium ion Inorganic materials 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000001954 sterilising effect Effects 0.000 description 1
- 238000004659 sterilization and disinfection Methods 0.000 description 1
- QORWJWZARLRLPR-UHFFFAOYSA-H tricalcium bis(phosphate) Chemical compound [Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O QORWJWZARLRLPR-UHFFFAOYSA-H 0.000 description 1
- 229910021642 ultra pure water Inorganic materials 0.000 description 1
- 239000012498 ultrapure water Substances 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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
- Y02A20/131—Reverse-osmosis
Landscapes
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
Description
【発明の詳細な説明】
３、発明の詳細な説明
（産業上の利用分野）
本発明は、シリカを多く含む水を原水として飲料水、工
業用水、超純水製造用水等の脱塩水を製造する場合に使
用される逆滲透処理法に関する。[Detailed Description of the Invention] 3. Detailed Description of the Invention (Field of Industrial Application) The present invention produces desalinated water such as drinking water, industrial water, and ultrapure water production water using water containing a large amount of silica as raw water. This paper relates to a reverse percolation processing method used when
（従来の技術）
逆浸透処理を含むプロセスにより脱塩水を得ようとする
場合に、火山系シラス堆積地域のように地域によって原
水中に多くのシリカが含まれることがある。この場合に
逆滲透処理で問題になることは、逆浸透膜の濃縮水側に
おいてシリカが濃縮され、溶解度を超える濃度とな゛す
、リカが膜表面に析出することでちる。(Prior Art) When desalinated water is obtained by a process including reverse osmosis treatment, the raw water may contain a large amount of silica depending on the region, such as areas where volcanic whitebait is deposited. In this case, the problem with reverse osmosis treatment is that the silica is concentrated on the concentrated water side of the reverse osmosis membrane, and the silica is deposited on the membrane surface at a concentration that exceeds its solubility.
一般に水に対するシリカの溶解度は、ＰＨ，水温等によ
って影響され、例えばＰＨ７，０、水温２５’ＣＫ、お
いて約１００ ｍｇ ／ ｅである。Generally, the solubility of silica in water is affected by pH, water temperature, etc., and is, for example, about 100 mg/e at PH 7.0 and water temperature 25'CK.
前記のシリカの膜表面析出を回避乃至解決するため、従
来技術では次のような方法がとられている。In order to avoid or solve the above-mentioned precipitation of silica on the film surface, the following methods have been adopted in the prior art.
（ｉ） 例えば原水が５０ ｍｇ ／ ｅのシリカを
含むものとすると、前記の溶解度の関係から、逆浸透処
理で原水の５０％の透過率を得るだめに原水の５０％の
濃縮水をブローするという低い回収率の運転に留める。(i) For example, if the raw water contains 50 mg/e of silica, from the above-mentioned solubility relationship, in order to obtain 50% permeability of the raw water in reverse osmosis treatment, 50% of the raw water must be blown with concentrated water. Limit operation to low recovery rate.
（ｉ） アルミニウム塩またはマグネシウム塩等を太
“■に使用する共沈法に上り脱珪処理するという前処理
を行う。(i) A pretreatment of desiliconization is carried out using a coprecipitation method using a large amount of aluminum salt or magnesium salt.
（従来技術の問題点）
前記の従来技術の（ｉ）では原水の回収率を非常に低い
レベルに留める運転をしなければならず、運転費、設備
費とも高くなる。従来技術の（ｉ）では、大量の薬品を
使用するので運転費がかかり、しかも多量の共沈スラッ
ジが発生するのでその処理が必要となる。(Problems with the prior art) In the prior art (i) described above, operation must be performed to keep the recovery rate of raw water at a very low level, resulting in high operating costs and equipment costs. Conventional technology (i) uses a large amount of chemicals, resulting in high operating costs, and also generates a large amount of coprecipitated sludge, which must be disposed of.
本発明は従来技術の上記問題点に解決を与え、脱珪処理
のように大量の薬品を消費するとどなく、スラツチの発
生も少く、しかも高回収率で良質な水が得られる方法を
提供することを目的とする。The present invention provides a solution to the above-mentioned problems of the prior art, and provides a method that does not consume a large amount of chemicals as in desiliconization treatment, generates less sludge, and can obtain high-quality water with a high recovery rate. The purpose is to
（問題点を解決するだめの手段）
前記目的は、本発明方法により、高濃度のシリカを含む
水を逆滲透法により処理するだめ、逆浸透処理を２段階
に分け、その第１段階においてはカルシウム、マグネシ
ウム等の水の硬度成分を高率で除去するがシリカ分は殆
んど通過する逆浸透膜を使用して逆浸透処理を行い、そ
の第２段階において１第１段階処理水に少量のアルカリ
剤を添加してＰＨを」こげるか、必要な場合に少量のス
ケール防止剤を添加するかしてシリカの析出を防止ｌ−
ながら逆浸透処理を行うことにより、達成される。(Means for Solving the Problems) The above object is to treat water containing a high concentration of silica by the reverse osmosis method by the method of the present invention.The reverse osmosis treatment is divided into two stages, and in the first stage, Reverse osmosis treatment is performed using a reverse osmosis membrane that removes water hardness components such as calcium and magnesium at a high rate, but allows most of the silica to pass through.In the second stage, a small amount is added to the water treated in the first stage. Prevent the precipitation of silica by adding an alkaline agent to increase the pH, or by adding a small amount of scale inhibitor if necessary.
This is achieved by performing reverse osmosis treatment.
本発明方法においては、ｎなった分離特性を有する逆浸
透装置を適切に組合わせ２段階にわたって逆浸透処理を
実施する。In the method of the present invention, reverse osmosis treatment is carried out in two stages by appropriately combining reverse osmosis devices having n separation characteristics.
すなわち、第１段階においては、水中の２価イオン（硬
度成分等）を高率で除去しシリカ分をろまり除去しない
特性を持つ所謂ルーズな逆浸透膜を用いて逆浸透処理を
行い、第２段階では第１段階の透過水をアルカリ剤、例
えば苛性ソーダ等の添加によりＰ■■を９，０程度に上
げて高い脱塩率を有する逆浸透膜を用いて逆浸透処理を
行うようにする。That is, in the first stage, reverse osmosis treatment is performed using a so-called loose reverse osmosis membrane that removes divalent ions (hardness components, etc.) in water at a high rate and does not remove silica content. In the second stage, the permeated water from the first stage is added with an alkaline agent, such as caustic soda, to raise the P■■ to about 9.0, and reverse osmosis treatment is performed using a reverse osmosis membrane with a high salt removal rate. .
上記の本発明の基本的プロセスの処理を有利に実施する
ため、付帯的手段として、第１段階の逆浸透装置の入口
には硫酸等の酸を少量注入して１）Ｊ−Ｉを弱酸側とし
、第１段階逆浸透処理において炭酸カルシウム等の析出
を防止する。In order to advantageously carry out the above basic process of the present invention, as an additional means, a small amount of acid such as sulfuric acid is injected into the inlet of the first stage reverse osmosis device to This prevents the precipitation of calcium carbonate, etc. in the first stage reverse osmosis treatment.
そして第１段階逆浸透装置の前まだはその透過水側にお
いて空気吹込み方式等による脱炭酸塔を設置して炭酸ガ
スのストリッピングを行い、それにより第１段階逆浸透
処理入口においてＰＨを調整するために必要とするアル
カリ剤の量の低減を図る。また第２段階逆浸透装置の入
口においては、必要に応じ、アルカリ剤の他に炭酸カル
シウム、リン酸カルシウム、硫酸カルシウム等の析出を
防止するために極く少量のスケール防止剤を添加しても
よい。Before the first stage reverse osmosis equipment, a decarbonation tower using an air blowing method is installed on the permeated water side to strip carbon dioxide gas, thereby adjusting the pH at the first stage reverse osmosis treatment inlet. The aim is to reduce the amount of alkaline agent required to Further, at the inlet of the second stage reverse osmosis device, in addition to the alkaline agent, a very small amount of a scale inhibitor may be added in order to prevent precipitation of calcium carbonate, calcium phosphate, calcium sulfate, etc., if necessary.
添付図は本発明方法を実施するフローの１例を示す。The attached figure shows an example of a flow for implementing the method of the invention.
高濃度のシリカを含む原水（１）は原水槽（２）に送ン
ーきれ、原水ポンプ（３）により加圧して送出され、ミ
クロンフィルター（４）を通って濾過され、加圧ポンプ
（５）によりさらに逆浸透圧力に昇圧されて逆浸透装置
（６）に送られ第１段階の逆浸透処理が行なわれる０と
の際に、第１段階の逆浸透装置（６）の濃縮水側にスケ
ーリングが起らないようにするため、酸注入槽（７）を
設は酸注入ポンプ（８）により原水に酸を注入し、逆浸
透装置（６）の入口のＩＩを弱酸側に調整する。ミクロ
ンフィルター（４）は後続の加圧ポンプ（５）、逆浸透
装置（６）に目づまり、かみ込みを起させないために前
置する。Raw water (1) containing a high concentration of silica is sent to a raw water tank (2), pressurized and sent out by a raw water pump (3), filtered through a micron filter (4), and then sent to a pressurizing pump (5). The pressure is further increased to reverse osmosis pressure and sent to the reverse osmosis device (6) where the first stage reverse osmosis treatment is performed. In order to prevent this from occurring, an acid injection tank (7) is installed, and an acid injection pump (8) is used to inject acid into the raw water, and the inlet II of the reverse osmosis device (6) is adjusted to the weak acid side. The micron filter (4) is placed in front of the subsequent pressure pump (5) and reverse osmosis device (6) to prevent clogging and clogging.
逆滲透装置において第１段階脱塩処理された透過水（９
）は脱炭酸塔ａ１に送られ塔内の充填物（１１）間を流
下する間にブロアー０２により塔内に吹込まれた空気と
接触し炭酸ガスが除去される。The permeated water (9
) is sent to the decarboxylation tower a1, and while flowing down between the packings (11) in the tower, it comes into contact with the air blown into the tower by the blower 02, and carbon dioxide gas is removed.
脱気された第１段階処理水には、アルカリ剤が貯槽０か
らアルカリ剤注入ポンプ０→により注入されてＰＨがア
ルカリ側に調整され、また必要に応じ少量のスケール防
止剤が貯槽ａυからスケール防止剤注入ポンプ０呻によ
り注入されて、第１段階処理水槽σカに貯められる。An alkaline agent is injected into the deaerated first stage treated water from the storage tank 0 by the alkaline agent injection pump 0→ to adjust the pH to the alkaline side, and if necessary, a small amount of scale preventive agent is added to the scale from the storage tank aυ. The inhibitor is injected by the pump 0 and stored in the first stage treatment tank σ.
このＰＨ調整されたスケール防止剤を任意に含む第１段
階処理水は第２段加圧ポンプ（１樽によシ所要圧力に加
圧されて逆浸透装置０呻に送られ第２段階の逆浸透処理
が行なわれ、第２段階処理水槽（財）に貯められる。The first-stage treated water, which optionally contains this pH-adjusted scale inhibitor, is pressurized to the required pressure by a second-stage pressure pump (1 barrel) and sent to the reverse osmosis equipment. Infiltration treatment is performed and the water is stored in the second stage treatment tank.
この本発明方法の処理を行った処理水は使用目的に必要
な処理、例えばＰＨ調整、殺菌等がなされた後、使用点
に供給される。The treated water treated according to the method of the present invention is supplied to the point of use after being subjected to treatments necessary for the purpose of use, such as pH adjustment and sterilization.
第１段階逆浸透装置（６）の濃縮側の濃縮水ＣＤは弱酸
性、第２段階逆浸透装置（１９１の濃縮側の濃縮水（イ
）はアルカリ性のため、両者を混合し混合濃縮水（至）
とすれば、ＰＨは５．８〜８．６の中性に調整され、排
水としてその１−１放流して差支えない。The concentrated water CD on the concentration side of the first stage reverse osmosis device (6) is weakly acidic, and the concentrated water (A) on the concentration side of the second stage reverse osmosis device (191) is alkaline, so the two are mixed and mixed concentrated water ( To)
If so, the pH will be adjusted to a neutral value of 5.8 to 8.6, and the 1-1 discharge can be discharged as wastewater.
尚、外気に塵埃などが含まれる場合は、ブロアー＠の空
気吹込口に適当なフィルタを設備し、あるいは原水ポン
プ（３）出口に、酸注入後に、ブロアーを含む脱炭酸塔
設備を設置しその処理水をミクロンフィルター（４）、
加圧ポンプ（５）を経て第１段階逆浸透装置（６）に送
るようにしてもよい。If the outside air contains dust, etc., install an appropriate filter at the air inlet of the blower @, or install decarbonation tower equipment including a blower at the outlet of the raw water pump (3) after injecting acid. Micron filter (4) for treated water,
It may be sent to the first stage reverse osmosis device (6) via a pressure pump (5).
後者の場合は、逆浸透装置（６）の透過水（９）は直接
貯槽σηに入れるようにする。In the latter case, the permeated water (9) of the reverse osmosis device (6) is directly introduced into the storage tank ση.
（作用）
本発明方法においては、第１段階逆浸透処理でけカルシ
ウム、マグネシウム、硫酸イオン、リン酸イオン等のス
ケール生成成分イオンは殆んど除去されるので、ス）ｒ
−Ｊｌ／生成成分を殆んど含捷ない透過水が得られる
。そしてシリカは第１段階逆浸透装置の透過水側にかな
り透過するので、濃縮水側であまりシリカは濃縮されず
、析出は起らず、第１投階逆浸透処理は高い回収率で実
施することができる。(Function) In the method of the present invention, most of the scale-forming component ions such as calcium, magnesium, sulfate ions, and phosphate ions are removed in the first stage reverse osmosis treatment.
-Jl/Permeated water containing almost no produced components is obtained. Since a considerable amount of silica permeates into the permeated water side of the first-stage reverse osmosis equipment, silica is not very concentrated on the concentrated water side and no precipitation occurs, allowing the first-stage reverse osmosis treatment to be carried out at a high recovery rate. be able to.
上記のように第１段階逆浸透処理でスケール成分が殆ん
ど除去されるので、第２段階逆浸透処理ではその人［１
側でＰＩ−Ｔが高くてもスケールの生成が起らない。一
方、シリカ溶解度はＰＨを高くすると著しく上昇し、例
えばＰＨが９．０になると２５′ｃの水温で溶解度は約
２００ ｍｇ／ｅにもなる０従って第２段階逆浸透処理
では入口側でアルカリ剤番添加して１）１■を上げるこ
とによりシリカ溶解度を大幅に」二昇させ、逆浸透膜と
して２価イオンのみならず１価イオンおよびシリカを高
説塩率で除去する膜を使用してこれらを除去する処理を
行い、高回収率を得ることができる。As mentioned above, most of the scale components are removed in the first stage reverse osmosis treatment, so in the second stage reverse osmosis treatment, the person [1
No scale formation occurs even if the PI-T is high on the side. On the other hand, the solubility of silica increases significantly as the pH increases; for example, when the pH is 9.0, the solubility reaches approximately 200 mg/e at a water temperature of 25'C. Therefore, in the second stage of reverse osmosis treatment, alkali The solubility of silica is significantly increased by adding the agent number 1) to increase 1■, and a reverse osmosis membrane that removes not only divalent ions but also monovalent ions and silica at a high salt rate is used. A high recovery rate can be obtained by performing a process to remove these.
（実施例）
本発明方法により２図示例の装置を使用し、高濃度のシ
リカを含む原水に先ず硫酸を注入して弱酸性として第１
段階の逆浸透処理を実施する。その逆浸透膜としては、
市場入手できる東しく株）製品番ＳＵ −２０ＯＲまた
は５Ｕ−２０Ｏ８を使用し回収率Ｖ１９０％程度にとる
０
第１段階逆浸透処理の透過水は脱炭酸塔で炭酸ガスをス
トリッピングし、苛性ソーダを注入してＰＩ（９，０に
調整しまた安全のためポリリン酸塩系スケール防止剤を
３ ｍｇ ／ ｅ添加した上で、第２段階逆浸透処理を
実施する。(Example) According to the method of the present invention, sulfuric acid was first injected into raw water containing high concentration of silica using the apparatus shown in the two illustrated examples to make it weakly acidic.
Perform stage reverse osmosis treatment. The reverse osmosis membrane is
Use Toshiku Co., Ltd. product number SU-20OR or 5U-20O8, which is available on the market, to achieve a recovery rate of about 190%. The permeated water from the first stage reverse osmosis treatment is stripped of carbon dioxide gas in a decarbonation tower, and treated with caustic soda. After injecting and adjusting the PI (9.0) and adding 3 mg/e of polyphosphate scale inhibitor for safety, the second stage reverse osmosis treatment is performed.
第２段階逆浸透処理の逆浸透膜としては、合成膜でアル
カリ側で使用でき、かつナトリウムイオン、塩素イオン
等の１価イオン９０チ 以上除去できる市場入手可能な
逆浸透膜、例えば東しく株）製品番ＳＵ ４００ Ｒ、
デコーボン社製、品番Ｂ−１５、Ｅ−９・等が使用でき
る。第２段階逆浸透の回収率は回収率を８０チ程度とし
、この高回収率でも、シリカ溶解度を高くしているので
析出は起らなかった。As the reverse osmosis membrane for the second stage reverse osmosis treatment, commercially available reverse osmosis membranes that are synthetic membranes that can be used on the alkaline side and that can remove 90 or more monovalent ions such as sodium ions and chloride ions, such as Toshiku Co., Ltd. ) Product number SU 400 R,
Products manufactured by Decobon Co., Ltd., product numbers B-15, E-9, etc. can be used. The recovery rate of the second stage reverse osmosis was about 80 cm, and even at this high recovery rate, no precipitation occurred because the solubility of the silica was high.
第１表の１および同２に目示フローに記入の各経過点（
Ａ）〜αＤにおける水質を示す。シリカを多く含む原水
を本発明方法に従い高回収率でシリカ濃縮によるトラブ
ルを起さずに処理することができる。Each progress point entered in the indicated flow in 1 and 2 of Table 1 (
The water quality in A) to αD is shown. Raw water containing a large amount of silica can be treated with a high recovery rate according to the method of the present invention without causing troubles due to silica concentration.
第２表の２
〔註記
１ 経過点Ａ：原水
経過点Ｂ：第第１略
経過点Ｄ：第１段階逆浸透装置濃縮水
経過点Ｊ弓：脱炭酸塔出口
経過点Ｆ：第第２陪
経過点１■：第２段階逆浸透装置濃縮水２ 第１表にお
いてシリカは炭酸カルシウム（ ＱａＱＯ３）換算値の
だめ、４２ ｍｇ／ｅ 、 ７８ ｍｇ／ｅ 。Table 2-2 [Note 1 Transition point A: Raw water transition point B: 1st approximate transition point D: 1st stage reverse osmosis device concentrated water transition point J bow: Decarbonation tower outlet transition point F: 2nd phase Progress point 1 ■: Second stage reverse osmosis device Concentrated water 2 In Table 1, silica is calculated as calcium carbonate (QaQO3), 42 mg/e, 78 mg/e.
１７４ ｍｇ／ｅ％はシリカ換等として各々５０ ｍｇ
／ｅ。174 mg/e% is 50 mg each as silica etc.
/e.
９４ ｍｇ／ｅ、２０９ ｍｇ／ｅに相当する。This corresponds to 94 mg/e and 209 mg/e.
６ 第１段階逆浸透装置人［１で硫酸４．８ ｍｇ／ｌ
添加。6 First stage reverse osmosis device [1 with sulfuric acid 4.8 mg/l
Addition.
４、第１段階逆浸透装置出口で脱炭酸処理。4. Decarboxylation treatment at the exit of the first stage reverse osmosis equipment.
５、第１段階逆浸透装置入口で苛性ソーダ２．０ｍｇ／
’ ％ポリリン酸塩３．０ｍｇ／ｅ添加。5. Caustic soda 2.0mg/at the inlet of the first stage reverse osmosis equipment
'% polyphosphate 3.0mg/e added.
６、 第１段階逆浸透回収率９０％、第２段階逆浸透回
収率８０チ、全体回収率７２ ％。6. 1st stage reverse osmosis recovery rate 90%, 2nd stage reverse osmosis recovery rate 80%, overall recovery rate 72%.
乙 第１段階逆浸透膜 東しく銅製ＳＵ − ２０Ｏ
Ｒ。Otsu 1st stage reverse osmosis membrane Toshiku Copper SU-20O
R.
第２段階逆浸透膜 東し■製５Ｕ−４００ ＲＯ ）
ここで第１および第１段階逆浸透理の＃給水シリカ濃度
とその条件におけるシリカ溶解度とを第２表に示す。2nd stage reverse osmosis membrane 5U-400 RO made by Toshi ■)
Here, Table 2 shows the silica concentrations in the feed water of the first and first stage reverse osmosis treatments and the silica solubility under those conditions.
第２表
こうして高濃度のシリカを含む原水を逆浸透によシ全体
回収率７２％の高回収率にて処理することができた。ま
た各段階逆浸透処理の濃縮水のシリカ濃度はその条件に
おける溶解度以下のため析出することはない。Table 2 In this way, raw water containing a high concentration of silica could be treated by reverse osmosis with a high overall recovery rate of 72%. Furthermore, the silica concentration in the concentrated water of each stage of reverse osmosis treatment is less than the solubility under the conditions, so no precipitation occurs.
実施例においては、原水硬度が高いため、第２段階逆浸
透処理の入口でスケール防止剤を注入したが、濃縮水ラ
ンゲリャ指数も若干子側にある程度なので極く僅かの注
入量でよい。In the example, since the hardness of the raw water is high, a scale inhibitor was injected at the inlet of the second stage reverse osmosis treatment, but since the Langelier index of the concentrated water is also slightly on the small side, only a small amount of injection is required.
（発明の効果） ′
以上のように、本発明方法によると、シリカを高濃度に
含む水を、回収率を低下させたり、脱珪処理を行なった
シすることなく、逆浸透法で高回収率および高率脱塩の
処理を行うことができる。(Effects of the Invention) As described above, according to the method of the present invention, water containing a high concentration of silica can be recovered at a high rate by reverse osmosis without reducing the recovery rate or performing desiliconization treatment. It is possible to perform high-rate and high-rate desalination treatments.
添付図は本発明方法を実施する装置フロー線図の１例を
示す。
（１）・・原水、（２）・・原水槽、（３）・・原水ポ
ンプ、（４）・・ミクロンフィルター、（５）・Φ加圧
ポンプ、（６）・・逆浸透装置、（７）・・酸注入槽、
（８）・・酸注入ポンプ、（９）・・透過水、αＯー争
脱炭＊１７！ｒ，ｏｎ・・充填物、＠・・ブロアー、０
浄・・：貯槽、Ｑ４）・・アルカリ剤注入ポンプ、ａυ
・・貯槽、Ｑ・・・スケール防止剤注入ポンプ、ａη・
・第１段階処理水槽、０尋・・第２段階加圧ポンプ、θ
す・・逆浸透装置、（１）・・第２段階処理水槽、Ｃ！
υ（イ）・・濃縮水、（ホ）・・混合濃縮水、（３）（
Ｂｌ （０１■）ＣＥ） （Ｆ） （Ｇ）σｊ・・経過
点。The attached figure shows an example of a flow diagram of an apparatus implementing the method of the invention. (1) Raw water, (2) Raw water tank, (3) Raw water pump, (4) Micron filter, (5) Φ pressure pump, (6) Reverse osmosis device, ( 7)...Acid injection tank,
(8)... Acid injection pump, (9)... Permeated water, αO - decarburization *17! r, on...Filling, @...Blower, 0
Purification...: storage tank, Q4)...alkaline agent injection pump, aυ
・・Storage tank, Q・・Scale inhibitor injection pump, aη・
・1st stage treatment tank, 0 fathoms ・2nd stage pressure pump, θ
Reverse osmosis equipment, (1)...Second stage treatment tank, C!
υ(A)...Concentrated water, (E)...Mixed concentrated water, (3)(
Bl (01■)CE) (F) (G)σj...Elapsed point.
Claims (1)
、逆浸透処理を２段階に分け、その第１段階においては
カルシウム、マグネシウム等の水の硬度成分を高率で除
去するがシリカ分は殆んど通過する逆浸透膜を使用して
逆滲透処理を行い、その第２段階においては第１段階処
理水に少量のアルカリ剤を添加してＰＨを上げるか少量
のスケール防止剤を添加するかしてシリカの析出を防止
しながら逆浸透処理を行うことを特徴とする高濃度のシ
リカを含む水の逆滲透処理法。In order to treat water containing a high concentration of silica using reverse osmosis, the reverse osmosis treatment is divided into two stages.In the first stage, water hardness components such as calcium and magnesium are removed at a high rate, but the silica content is Reverse osmosis treatment is performed using a reverse osmosis membrane that passes through most of the water, and in the second stage, a small amount of alkaline agent is added to the first stage treated water to raise the pH or a small amount of scale inhibitor is added. A reverse osmosis treatment method for water containing high concentration of silica, which is characterized by performing reverse osmosis treatment while preventing the precipitation of silica.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61138486A JPS62294484A (en) | 1986-06-13 | 1986-06-13 | Reverse osmosis treatment of water containing silica at high concentration |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61138486A JPS62294484A (en) | 1986-06-13 | 1986-06-13 | Reverse osmosis treatment of water containing silica at high concentration |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62294484A true JPS62294484A (en) | 1987-12-21 |
Family
ID=15223216
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61138486A Pending JPS62294484A (en) | 1986-06-13 | 1986-06-13 | Reverse osmosis treatment of water containing silica at high concentration |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62294484A (en) |
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0946268A4 (en) * | 1996-08-12 | 2000-11-22 | Debasish Mukhopadhyay | Method and apparatus for high efficiency reverse osmosis operation |
| WO2002026362A1 (en) * | 2000-09-29 | 2002-04-04 | Ionics, Incorporated | High recovery reverse osmosis process and apparatus |
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| JPS59112890A (en) * | 1982-12-20 | 1984-06-29 | Japan Organo Co Ltd | Desalination by reverse osmosis membrane device |
| JPS6038083A (en) * | 1983-08-09 | 1985-02-27 | Kurita Water Ind Ltd | Desalting method |
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| JPS59112890A (en) * | 1982-12-20 | 1984-06-29 | Japan Organo Co Ltd | Desalination by reverse osmosis membrane device |
| JPS6038083A (en) * | 1983-08-09 | 1985-02-27 | Kurita Water Ind Ltd | Desalting method |
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