JPS62258793A - Method for neutralizing high-concentration alkali solution - Google Patents
Method for neutralizing high-concentration alkali solutionInfo
- Publication number
- JPS62258793A JPS62258793A JP10161786A JP10161786A JPS62258793A JP S62258793 A JPS62258793 A JP S62258793A JP 10161786 A JP10161786 A JP 10161786A JP 10161786 A JP10161786 A JP 10161786A JP S62258793 A JPS62258793 A JP S62258793A
- Authority
- JP
- Japan
- Prior art keywords
- alkaline solution
- primary
- carbon dioxide
- mixer
- highly concentrated
- 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
- 238000000034 method Methods 0.000 title claims description 12
- 230000003472 neutralizing effect Effects 0.000 title claims description 5
- 239000003513 alkali Substances 0.000 title abstract 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 38
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 27
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 19
- 239000002253 acid Substances 0.000 claims abstract description 17
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 17
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims abstract description 12
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims abstract description 12
- 238000011221 initial treatment Methods 0.000 claims abstract description 7
- 239000012670 alkaline solution Substances 0.000 claims description 24
- 239000000243 solution Substances 0.000 claims description 9
- 238000006386 neutralization reaction Methods 0.000 claims description 8
- 238000010979 pH adjustment Methods 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 abstract description 16
- 238000011282 treatment Methods 0.000 abstract description 8
- 239000012530 fluid Substances 0.000 abstract description 7
- 239000000203 mixture Substances 0.000 abstract description 2
- 230000029219 regulation of pH Effects 0.000 abstract 2
- 239000002351 wastewater Substances 0.000 description 5
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 150000007513 acids Chemical class 0.000 description 3
- 239000004568 cement Substances 0.000 description 3
- 239000011734 sodium Substances 0.000 description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 2
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 2
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 229910052791 calcium Inorganic materials 0.000 description 2
- 239000007795 chemical reaction product Substances 0.000 description 2
- 239000011651 chromium Substances 0.000 description 2
- 238000005192 partition Methods 0.000 description 2
- 229910052708 sodium Inorganic materials 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 description 1
- NPYPAHLBTDXSSS-UHFFFAOYSA-N Potassium ion Chemical compound [K+] NPYPAHLBTDXSSS-UHFFFAOYSA-N 0.000 description 1
- FKNQFGJONOIPTF-UHFFFAOYSA-N Sodium cation Chemical compound [Na+] FKNQFGJONOIPTF-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 229910001424 calcium ion Inorganic materials 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910001425 magnesium ion Inorganic materials 0.000 description 1
- 229910001414 potassium ion Inorganic materials 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 235000017557 sodium bicarbonate Nutrition 0.000 description 1
- 235000011121 sodium hydroxide Nutrition 0.000 description 1
- 229910001415 sodium ion Inorganic materials 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
Abstract
Description
【発明の詳細な説明】
〔発明の技術分野〕
本発明はカルシウム系及びナトリウム系の高濃度アルカ
リ排水の中和方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a method for neutralizing highly concentrated calcium-based and sodium-based alkaline wastewater.
カルシウム系及びナトリウム系のアルカリ排水（アルカ
リ溶液）の中和は従来、塩酸、硫酸などの強酸で処理さ
れて来た。強酸による中和処理には有利な点もあるが、
使用上の安全性、処理の所要時間、などに問題があり、
特に高濃度のアルカリ溶液を強酸で中和する場合には処
理水をｐ］１７付近にコントロールすることがきわめて
困難なため酸の過剰添加をまねき易く、処理水の安全性
を得るのが困難であった。Neutralization of calcium-based and sodium-based alkaline wastewater (alkaline solutions) has conventionally been treated with strong acids such as hydrochloric acid and sulfuric acid. Neutralization treatment with strong acids has some advantages, but
There are problems with safety in use, processing time, etc.
In particular, when a highly concentrated alkaline solution is neutralized with a strong acid, it is extremely difficult to control the treated water to around p]17, which tends to lead to excessive addition of acid, making it difficult to ensure the safety of the treated water. there were.
このため、最近では炭酸ガスによる中和処理が提案され
ているが、これにも種々の問題がある。For this reason, neutralization treatment using carbon dioxide gas has recently been proposed, but this method also has various problems.
すなわち、苛性ソーダ系のアルカリ排水における原水濃
度は、水１１に対し４０ｇ以下でないと処理水中に重炭
酸ソーダが析出して白濁を生ずる。That is, unless the concentration of the raw water in the caustic soda-based alkaline wastewater is 40 g or less per 11 g of water, bicarbonate of soda will precipitate in the treated water, resulting in white turbidity.
また、セメント系アルカリ溶液の原水中には通常、カリ
ウムイオンに０、カルシウムイオンＣａ２“、ナトリウ
ムイオンＮａ”、マグネシウムイオン１ＩＩＮ＋、クロ
ムＣｒ及び不純物などのアルカリ成分が含まれており、
高いｐＨ値を示しているが、これらのアルカリ分は炭酸
ガスとの反応においては複雑な相関作用を起こし、反応
生成物により装置の目詰りをおこすことが多い。特に、
最近のセメント原料には軽量化などのためにアルミニウ
ムが多く用いられているため、これが排液原水中に溶は
込み、炭酸ガスと反応して処理水を白濁させ、且つ大量
の炭酸ガスを無駄に消費する結果となっている。In addition, the raw water of cement-based alkaline solution usually contains alkaline components such as potassium ion 0, calcium ion Ca2", sodium ion Na", magnesium ion 1IIN+, chromium Cr, and impurities.
Although it shows a high pH value, these alkaline components cause a complex interrelationship when reacting with carbon dioxide gas, and the reaction products often cause clogging of the apparatus. especially,
Aluminum is often used in recent cement raw materials to reduce weight, so aluminum dissolves in raw wastewater and reacts with carbon dioxide, making the treated water cloudy and wasting a large amount of carbon dioxide. This results in consumption of
このようにｐＨ値の高いアルカリ溶液を炭酸ガスのみで
中和する場合は反応生成物による目詰まり及び処理水の
白濁が避けられなかった。When an alkaline solution with such a high pH value is neutralized only with carbon dioxide gas, clogging due to reaction products and clouding of the treated water are unavoidable.
本発明の目的は使用上の安全性が得られ、装置の目詰ま
りや処理水の白濁がなく、しかも処理水のｐＨ値値を所
望の値（ｐｌ＋７付近）にコントロールし易い高濃度ア
ルカリ溶液の中和方法を提供することにある。The purpose of the present invention is to provide a highly concentrated alkaline solution that is safe to use, does not cause clogging of the equipment or cloudiness of the treated water, and is easy to control the pH value of the treated water to a desired value (near PL+7). The objective is to provide a neutralization method.
本発明の他の目的は高濃度アルカリ溶液をその送流路の
ライン内で瞬間且つ効率的に中和する方法を提供するこ
とにある。Another object of the present invention is to provide a method for instantaneously and efficiently neutralizing a highly concentrated alkaline solution within its flow path.
本発明は高濃度のアルカリ溶液を塩酸、硫酸などの強酸
でｐｎｔｔ、ｓ以下、好ましくはｐＨ１０程度に第１次
ｐＨ調整した後、この第１次処理水を炭酸ガスＣＯ２で
ｐＨ７程度に第２次ｐＨ調整することを特徴とするもの
で、特に原水の送流過程で上記中和処理を行うために、
より具体的には、高濃度アルカリ溶液を送流管を通して
所定圧力で送流するとともに、送流中の溶液に強酸を添
加しながら送流管に介在させた第１のミキサーで混合す
ることにより、溶液原水をｐＨ値 １１．５以下、好ま
しくはｐＨＩＯ程度に第１次ｐＨ値調整した後、前記ミ
キサーの下流側送流管内に所定圧力で送られる１次処理
溶液に炭酸ガスを添加しながら前記下流側送流管に介在
させた第２のミキサーで混合することにより放流可能な
ｐＨ値（ｐＨ７前後）に第１次ｐＨ調整するものである
。In the present invention, after first adjusting the pH of a highly concentrated alkaline solution with a strong acid such as hydrochloric acid or sulfuric acid to pntt, s or less, preferably to about pH 10, this first treated water is adjusted to a pH of about 7 using carbon dioxide gas CO2. It is characterized by adjusting the pH, and in particular, in order to perform the above neutralization treatment during the raw water flow process,
More specifically, by sending a highly concentrated alkaline solution through a flow pipe at a predetermined pressure, and adding a strong acid to the solution being fed, the solution is mixed in a first mixer interposed in the flow pipe. After primary pH adjustment of the solution raw water to a pH value of 11.5 or less, preferably around pHIO, while adding carbon dioxide gas to the primary treatment solution that is sent at a predetermined pressure into the downstream flow pipe of the mixer. By mixing with a second mixer interposed in the downstream flow pipe, the primary pH is adjusted to a pH value (around pH 7) that can be discharged.
特に本発明の好ましい実例では上記第１次及び第２次の
ｐＨ処理を原水の送流管に設けたミキサーによりインラ
インで行うところに利点がある。Particularly, in a preferred embodiment of the present invention, there is an advantage in that the above-mentioned first and second pH treatments are carried out in-line by a mixer installed in the feed pipe of the raw water.
高濃度のアルカリ溶液を強酸で中和する場合の問題点は
処理水をｐＨ７程度の放出許容ｐＨ値にコントロールし
にくいため強酸の加剰添加を生じ易いことにあるが、ｐ
Ｈｉｏ程度に調整する限りでは強酸の加剰添加の問題は
生じない。The problem with neutralizing a highly concentrated alkaline solution with a strong acid is that it is difficult to control the treated water to an allowable release pH value of around pH 7, which tends to result in excessive addition of strong acid.
As long as it is adjusted to about Hio, the problem of excessive addition of strong acid does not occur.
他方、アルカリ溶液原水を炭酸ガスで中和する場合の処
理水のｐＨ値と白濁の関係を種々検討したところ、カル
シウム系アルカリ飽和溶液（ｐＨ１２，５）のように原
水のｐＨ値が高いと炭酸ガスを供給し続けても白濁状態
は解消できず、このような白濁状態をおこさずに、炭酸
ガスのみによって中和を行ない得る原水のアルカリ濃度
は、ｐＨ値が１１．５程度以下の低濃度の場合までであ
ることが実験により確ｊＥされた。On the other hand, various studies have been conducted on the relationship between the pH value and cloudiness of the treated water when raw alkaline solution water is neutralized with carbon dioxide gas. Even if gas is continued to be supplied, the cloudy state cannot be resolved, and the alkaline concentration of raw water that can be neutralized only with carbon dioxide gas without causing such a cloudy state is a low concentration with a pH value of about 11.5 or less. It has been confirmed through experiments that this is true up to the case of .
上記の二点から本発明者は高濃度のアルカリ溶液を強酸
で先ずｐｌｌｌｌ、５以下、好ましくはｐＨｉ。In view of the above two points, the present inventor first prepared a highly concentrated alkaline solution with a strong acid at a pH of 5 or less, preferably pH.
程度に第１次ｐＨ値調整し、第１次処理溶液を炭酸ガス
でｐＨ７程度の放出許容ｐＨ値に第２次ｐＨ調整するこ
とにより、処理水をｐＨ７程度にコントロールし易す（
、しかも白濁を解消できる処理方法を見い出したもので
ある。It is easy to control the pH of the treated water to about 7 by adjusting the primary pH value to a certain level, and then adjusting the secondary pH of the primary treatment solution to a release permissible pH value of about pH 7 with carbon dioxide gas (
Moreover, we have discovered a treatment method that can eliminate cloudiness.
第１図は本発明を実施する好ましい装置のフローシート
であり、１は工場等から排出されるセメント排水などの
高濃度アルカリ溶液原水槽、２は原水槽１のアルカリ溶
液をポンプ３を介して適宜の圧力で送る送流管である。FIG. 1 is a flow sheet of a preferred apparatus for carrying out the present invention, in which 1 is a high concentration alkaline solution raw water tank such as cement wastewater discharged from factories, etc., and 2 is a raw water tank in which the alkaline solution in the raw water tank 1 is pumped through a pump 3. This is a flow pipe that sends the fluid at an appropriate pressure.
送流管２の途中（送流ライン内）に第１の反応ミキサー
舐が介装されているとともに、このミキサーもしくはミ
キサーの上流側送流管２ａに系外のタンク５からバイブ
ロを介して硫酸１１□−３０４あるいは塩酸１１（Ｊな
どの強酸が添加されるようになっている。A first reaction mixer is interposed in the middle of the flow pipe 2 (inside the flow line), and sulfuric acid is supplied to this mixer or the upstream flow pipe 2a of the mixer from a tank 5 outside the system via a vibro. A strong acid such as 11□-304 or hydrochloric acid 11 (J) is added.
さらに、第１反応ミキサー４ａの下流側送流管２ｂには
第２の反応ミキサー４ｂがその送流ライン内に設置され
ているとともにこのミキサー４ｂもしくは送流管２ｂに
系外のタンク７からパイプ８を介して炭酸ガスが添加さ
れるようになっている。Further, a second reaction mixer 4b is installed in the downstream flow pipe 2b of the first reaction mixer 4a, and a pipe from a tank 7 outside the system is connected to the mixer 4b or the flow pipe 2b. Carbon dioxide gas is added via 8.
かくして、ｐＨ１２，５程度の高濃度アルカリ溶液はポ
ンプ３により送流管２を所定圧力で送られタンク５より
硫酸あるいは塩酸の供給を受け、送流管２のライン内に
ある第１の反応ミキサー４良で均一に撹拌、混合され、
ｐＨ１１，５以下好ましくはｐＨ１０，０程度に第１次
処理を行う。次いで上記ｐＨ調整された第１次処理水に
炭酸ガスを供給しながら下流側送流管２ｂのライン内に
組み込まれた第２の反応ミキサー４ｂに送り、再度、攪
拌、混合してｐＨ７程度に第２次処理を行なう。In this way, the highly concentrated alkaline solution with a pH of about 12.5 is sent through the flow pipe 2 at a predetermined pressure by the pump 3, is supplied with sulfuric acid or hydrochloric acid from the tank 5, and is then sent to the first reaction mixer in the line of the flow pipe 2. Stir and mix evenly with 4 good quality,
The primary treatment is carried out to a pH of 11.5 or lower, preferably around 10.0. Next, while supplying carbon dioxide gas to the above-mentioned pH-adjusted primary treated water, it is sent to the second reaction mixer 4b built into the line of the downstream flow pipe 2b, and stirred and mixed again to bring the pH to about 7. Perform secondary processing.
各々の反応ミキサー４＾、４トの下流側にｐ１目食出器
９ａ、９ｂを設け、検出出力に応じてバイブロ、８のハ
ルプロ’、８’を制御することにより、各処理段階にお
ける処理水のｐＨ値を所定値に維持するようにしてもよ
い。P1 feeders 9a and 9b are installed downstream of each reaction mixer 4^ and 4t, and by controlling Vibro and Halpro', 8' of 8 according to the detection output, the treated water at each treatment stage is controlled. The pH value may be maintained at a predetermined value.
本発明は上記第１次及び第２次ｐＨ３ｉ１整をアルカリ
溶液の送流路のライン内で処理するために溶液送流路２
内に第１、第２反応ミキサー４ｃＬ、４ｂを設置しであ
る。The present invention provides a solution flow path 2 in order to process the above-mentioned primary and secondary pH3i1 adjustment within the line of the alkaline solution flow path.
The first and second reaction mixers 4cL and 4b are installed inside.
ちなみに、第２図及び第３図は本発明方法を実施するの
に好適なミキサーを示すもので、第１、第２反応ミキサ
ー４へ、４トはいずれも円筒状反応管４０の上流側に、
所定の流圧で送られる管内の流体を同心円構造の多層状
旋回流に仕分けて反応管の内周壁に沿って旋回状に流下
させる変流路構成体４１を設けるとともに、その下流側
内周壁に多数の突起体４２を固設し、アルカリ溶液と添
加物の多層状旋回流体が突起体４２に衝突して反復剪断
することにより、多層旋回流体の界面を激しく撹乱する
ようになっている。Incidentally, FIGS. 2 and 3 show mixers suitable for carrying out the method of the present invention, and the first and second reaction mixers 4 are all connected to the upstream side of the cylindrical reaction tube 40. ,
A variable flow channel structure 41 is provided to sort the fluid in the tube, which is sent at a predetermined flow pressure, into a multilayered swirling flow having a concentric structure and flow down in a swirling manner along the inner circumferential wall of the reaction tube. A large number of protrusions 42 are fixedly installed, and the multilayered swirling fluid containing the alkaline solution and additive collides with the protrusions 42 and is repeatedly sheared, thereby violently disturbing the interface of the multilayered swirling fluid.
このため変流路構成体４１は好ましくは図のように、反
応管４０を縦方向に区画するように配した逆三角形の仕
切部１７４’ ４１ ａの左右の縁に沿って、下流方向
へ傾斜して延びる対称形の一対の割円状大盤４１ｂ、４
１ｂを交差状に一体結合してなり、大盤４１ｂの弧状縁
を反応管４０の内周壁に接合して取付けられている。For this reason, the variable flow channel structure 41 is preferably inclined downstream along the left and right edges of an inverted triangular partition 174' 41a arranged to vertically partition the reaction tube 40, as shown in the figure. A pair of symmetrical split circular large plates 41b, 4 extending as shown in FIG.
1b are integrally connected in a cross shape, and the arcuate edge of the large plate 41b is attached to the inner circumferential wall of the reaction tube 40.
また、突起体４２は好ましくは第３図のように先端に半
球部４２ａを設けた逆截頭錐台部４２ｂに形成し、多層
旋回流がこの突起体４２に衝突するような位置関係で反
応管４０の軸心に向けて配設されている。Further, the protrusion 42 is preferably formed into an inverted truncated truncated cone portion 42b with a hemispherical portion 42a at the tip as shown in FIG. It is arranged toward the axis of the tube 40.
本発明は強酸によるアルカリ溶液の中和をｐＨｌ。 The present invention deals with the neutralization of alkaline solutions by strong acids to pHl.
程度にしであるので強酸の過剰供給の生ずるおそれがな
く安全性が得られるとともに、放流許容値のｐＨ７付近
への中和処理は炭酸ガスで行うためｐＨ値のコントロー
ルが容易になる。しかも低濃度に第１次ｐＨ調整したア
ルカリ溶液に炭酸ガスを作用させるので処理水の白濁及
び装置の目詰まりの問題が同時に解消される。Since the pH value is small, there is no risk of excessive supply of strong acid and safety is achieved, and the pH value can be easily controlled because the neutralization treatment to around the discharge allowable value of pH 7 is performed with carbon dioxide gas. Moreover, since carbon dioxide gas is applied to the alkaline solution whose primary pH has been adjusted to a low concentration, the problems of clouding of the treated water and clogging of the apparatus are solved at the same time.
第１図は本発明の方法を実施する装置の一例を示すフロ
ーハート、第２図はこの装置に使用する反応ミキサーの
一部切欠き透視図、第３図は第２図の部分説明図である
。
１・・・アルカリ溶濃槽、３・・・ポンプ、４＾、４ｂ
・・・反応ミキサー、５・・・強酸タンク、７・・・Ｃ
Ｏ□クンク、９ ｃＬ、 ９ ｂ ・ｐｌ＋検出器。
第１ 図
漠２１ηFig. 1 is a flow heart showing an example of an apparatus for carrying out the method of the present invention, Fig. 2 is a partially cutaway perspective view of a reaction mixer used in this apparatus, and Fig. 3 is a partial explanatory view of Fig. 2. be. 1... Alkaline concentration tank, 3... Pump, 4^, 4b
...Reaction mixer, 5...Strong acid tank, 7...C
O□kunk, 9 cL, 9 b ・pl+detector. 1st desert 21η
Claims (2)
でｐＨ１１．５以下に第１次ｐＨ調整した後、第１次処
理をしたアルカリ溶液を炭酸ガスＣＯ＿２でｐＨ７程度
に第２次ｐＨ調整することを特徴とする高濃度アルカリ
溶液の中和方法(1) After primary pH adjustment of a highly concentrated alkaline solution to pH 11.5 or less with a strong acid such as hydrochloric acid or sulfuric acid, the primary pH of the alkaline solution after the primary treatment is adjusted to around pH 7 with carbon dioxide gas CO_2. A method for neutralizing a highly concentrated alkaline solution characterized by adjusting
で送流するとともに、送流中の該溶液に強酸を添加しな
がら送流管に介在させた第１のミキサーで混合すること
により溶液原水をｐＨ１１．５以下のアルカリ溶液に第
１次ｐＨ調整し、前記ミキサーの下流側送流管内に所定
圧力で送られる第１次処理溶液に炭酸ガスＣＯ＿２を添
加しながら前記下流側送流管に介在させた第２のミキサ
ーで混合することにより、第１次処理溶液をｐＨ７程度
に第２次ｐＨ調整することを特徴とする特許請求の範囲
第１項記載の高濃度アルカリ溶液の中和方法(2) A highly concentrated alkaline solution is sent through a flow pipe at a predetermined pressure, and a strong acid is added to the solution being flowed while being mixed in a first mixer interposed in the flow pipe. The raw water is subjected to primary pH adjustment to an alkaline solution having a pH of 11.5 or lower, and carbon dioxide gas CO_2 is added to the primary treatment solution that is sent at a predetermined pressure into the downstream flow pipe of the mixer. Neutralization of the highly concentrated alkaline solution according to claim 1, characterized in that the primary treatment solution is subjected to secondary pH adjustment to about pH 7 by mixing with a second mixer interposed in the Method
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10161786A JPS62258793A (en) | 1986-05-01 | 1986-05-01 | Method for neutralizing high-concentration alkali solution |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10161786A JPS62258793A (en) | 1986-05-01 | 1986-05-01 | Method for neutralizing high-concentration alkali solution |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62258793A true JPS62258793A (en) | 1987-11-11 |
Family
ID=14305363
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10161786A Pending JPS62258793A (en) | 1986-05-01 | 1986-05-01 | Method for neutralizing high-concentration alkali solution |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62258793A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5182669A (en) * | 1990-06-04 | 1993-01-26 | Pioneer Electronic Corporation | High density optical disk and method of making |
| JPH07251184A (en) * | 1994-03-11 | 1995-10-03 | Shinko Pantec Co Ltd | Treatment of water to be treated such as organic waste water and device therefor |
| KR20000042037A (en) * | 1998-12-24 | 2000-07-15 | 이구택 | Method of neutralizing waste water generating in aging treatment of electric furnace slag using carbon dioxide gas |
| ES2153310A1 (en) * | 1998-12-18 | 2001-02-16 | Colortex 1967 S L | Textile industry alkaline waste water treatment plant includes a combustion gas cooler, a water pretreatment zone and a gas powered neutralization zone |
| KR20020091513A (en) * | 2001-05-31 | 2002-12-06 | 유진화학(주) | PH control method of alkali solution with carbon dioxide gas and apparatus |
| JP2008194657A (en) * | 2007-02-16 | 2008-08-28 | Showa Tansan Co Ltd | Apparatus for neutralizing ph of drainage |
-
1986
- 1986-05-01 JP JP10161786A patent/JPS62258793A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5182669A (en) * | 1990-06-04 | 1993-01-26 | Pioneer Electronic Corporation | High density optical disk and method of making |
| JPH07251184A (en) * | 1994-03-11 | 1995-10-03 | Shinko Pantec Co Ltd | Treatment of water to be treated such as organic waste water and device therefor |
| ES2153310A1 (en) * | 1998-12-18 | 2001-02-16 | Colortex 1967 S L | Textile industry alkaline waste water treatment plant includes a combustion gas cooler, a water pretreatment zone and a gas powered neutralization zone |
| KR20000042037A (en) * | 1998-12-24 | 2000-07-15 | 이구택 | Method of neutralizing waste water generating in aging treatment of electric furnace slag using carbon dioxide gas |
| KR20020091513A (en) * | 2001-05-31 | 2002-12-06 | 유진화학(주) | PH control method of alkali solution with carbon dioxide gas and apparatus |
| JP2008194657A (en) * | 2007-02-16 | 2008-08-28 | Showa Tansan Co Ltd | Apparatus for neutralizing ph of drainage |
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