JPS6223634B2 - - Google Patents
Info
- Publication number
- JPS6223634B2 JPS6223634B2 JP10656482A JP10656482A JPS6223634B2 JP S6223634 B2 JPS6223634 B2 JP S6223634B2 JP 10656482 A JP10656482 A JP 10656482A JP 10656482 A JP10656482 A JP 10656482A JP S6223634 B2 JPS6223634 B2 JP S6223634B2
- Authority
- JP
- Japan
- Prior art keywords
- slaked lime
- water
- tank
- aqueous solution
- dissolving
- 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
Links
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims description 29
- 239000000920 calcium hydroxide Substances 0.000 claims description 28
- 235000011116 calcium hydroxide Nutrition 0.000 claims description 28
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 18
- 239000007864 aqueous solution Substances 0.000 claims description 12
- 239000008399 tap water Substances 0.000 claims description 11
- 235000020679 tap water Nutrition 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 8
- 229920006395 saturated elastomer Polymers 0.000 claims description 3
- 238000004090 dissolution Methods 0.000 description 19
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 9
- 239000007924 injection Substances 0.000 description 8
- 238000002347 injection Methods 0.000 description 8
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 6
- 239000000243 solution Substances 0.000 description 6
- 239000002002 slurry Substances 0.000 description 4
- 229910000019 calcium carbonate Inorganic materials 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 235000011121 sodium hydroxide Nutrition 0.000 description 3
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
- 229940043430 calcium compound Drugs 0.000 description 1
- 150000001674 calcium compounds Chemical class 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-N carbonic acid Chemical compound OC(O)=O BVKZGUZCCUSVTD-UHFFFAOYSA-N 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000004572 hydraulic lime Substances 0.000 description 1
- 239000002198 insoluble material Substances 0.000 description 1
- 235000017550 sodium carbonate Nutrition 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F15/00—Other methods of preventing corrosion or incrustation
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
Description
【発明の詳細な説明】
本発明は消石灰による上水道水のPH調整する方
法に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for adjusting the pH of tap water using slaked lime.
従来上水道において、管路に錆などが生じ赤水
を生ずることがあり、その防止が必要となつてい
る。また水道施設経費の大部分を占める管路の寿
命は場所によつてまちまちであり、80年近く使用
しても殆んど錆の生じないところもあれば、一方
わずか２年ほどで管路を交換せねばならない所も
ある。このような管路の耐久性の相異は水道水の
水質によるもので、アルカリ度が高く腐蝕性の小
さい水ほど管路の寿命が長いことが知られてい
る。 Conventionally, in water supply systems, rust has sometimes formed in pipes, resulting in red water, and there is a need to prevent this. Furthermore, the lifespan of pipes, which account for the majority of water facility costs, varies depending on the location; in some places, there is almost no rust even after nearly 80 years of use; There are some parts that need to be replaced. Such differences in the durability of pipes are due to the quality of tap water, and it is known that water with higher alkalinity and less corrosiveness has a longer lifespan.
管路の寿命を延ばし、水道水の赤水を防止する
ためには水道水のPHを調整することが必要であ
り、このため苛性ソーダ、ソーダ灰、消石灰など
の注入が行なわれており、最近では取扱いが容易
であるとの理由から苛性ソーダが多く使われてい
る。しかし苛性ソーダが単にPH調整機能しか有し
ないのに対し、消石灰を使用するときは管壁に炭
酸カルシウムの被膜をつくり、管路の腐蝕を防止
する機能をも有することで消石灰の使用がより望
ましいものである。 In order to extend the life of pipes and prevent red water from forming in tap water, it is necessary to adjust the pH of tap water.For this purpose, caustic soda, soda ash, slaked lime, etc. are injected into the water. Caustic soda is often used because it is easy to use. However, while caustic soda only has the function of adjusting pH, when using slaked lime, it creates a calcium carbonate film on the pipe wall, which also has the function of preventing corrosion of pipes, making it more desirable to use slaked lime. It is.
PH調整のため消石灰を水道水に注入する方法と
しては粉体注入法、スラリー注入法、溶液注入法
があるが、粉体注入は粉じんの問題や定量注入の
難しさがあり、又スラリー注入はスラリー濃度に
より違いもあるが、ストツクタンク内や配管内に
スケーリングを生じ操作しずらくなる。これに対
し溶液注入は消石灰を溶解槽内で連続的に溶解流
出させる方法で流体移送上極めて優れている。し
かしこの溶液注入法では不溶解物が溶解槽内に残
り、この不溶解物の処理に問題があつた。 Methods for injecting slaked lime into tap water to adjust pH include powder injection, slurry injection, and solution injection, but powder injection has problems with dust and difficulty in quantitative injection, and slurry injection Although it varies depending on the slurry concentration, it causes scaling inside the stock tank and piping, making it difficult to operate. On the other hand, solution injection is a method in which slaked lime is continuously dissolved and discharged in a dissolution tank, and is extremely superior in terms of fluid transfer. However, with this solution injection method, undissolved matter remained in the dissolution tank, and there was a problem in disposing of this undissolved matter.
本発明者等はこの残存不溶物について検討した
結果その主成分は消石灰が原水中の炭酸等と反応
して生成した炭酸カルシウムと、この炭酸カルシ
ウムの存在により溶解することを妨げられた消石
灰であること、又このものは溶解槽内において流
出消石灰水溶液のPHが12〜13に維持されている間
は殆んど溶解しないこと、更には溶解させるため
には非常に長時間を要することを知つた。 The present inventors investigated this residual insoluble material and found that its main components are calcium carbonate produced by the reaction of slaked lime with carbonic acid, etc. in raw water, and slaked lime that is prevented from dissolving due to the presence of this calcium carbonate. In addition, I learned that this substance hardly dissolves while the PH of the slaked lime solution is maintained at 12 to 13 in the dissolution tank, and furthermore, it takes a very long time to dissolve it. .
そこで本発明者等は消石灰を完全利用を行い、
即ち未溶解のカルシウム化合物を残すことなく、
かつ水道水のPH調整を安定して行ない得る方法に
ついて検討して本発明に達した。 Therefore, the inventors made full use of slaked lime,
That is, without leaving undissolved calcium compounds,
The present invention was achieved by studying a method for stably adjusting the pH of tap water.
本発明は消石灰粉体の溶解槽と該溶解槽での未
溶解分を更に溶解させる溶解槽とを設け、第１の
溶解槽で予め仕込んだ消石灰の80重量％以上を溶
解させるまで該溶解槽に水を供給しつつ消石灰略
飽和水溶液を取り出した後、未溶解分を第２の溶
解槽に移し、この槽に水を供給しつつ溶解させて
PH10以下の消石灰水溶液を連続的に取り出し、両
溶解槽より得た消石灰水溶液を連続的に着水井に
供給する水道水のPH調整方法である。 The present invention is provided with a dissolving tank for slaked lime powder and a dissolving tank for further dissolving the undissolved content in the dissolving tank, and the dissolving tank is used until 80% by weight or more of the slaked lime charged in advance in the first dissolving tank is dissolved. After taking out the approximately saturated aqueous solution of slaked lime while supplying water, the undissolved portion is transferred to a second dissolution tank, and dissolved while supplying water to this tank.
This method of adjusting the pH of tap water involves continuously taking out a slaked lime aqueous solution with a pH of 10 or less and continuously supplying the slaked lime aqueous solution obtained from both dissolution tanks to the receiving well.
次に附図により本発明を具体的に説明する。 Next, the present invention will be specifically explained with reference to the accompanying drawings.
附図において１は第１の溶解槽、２は第２の溶
解槽であり、両溶解槽は内部に撹拌機を有し、原
水は第１の槽では槽下部より第２の槽では下部又
は上面より供給し、消石灰水溶液は上部より取り
出すよう構成されている。この第１の溶解槽に予
め例えば２日間連続運転する相当量の消石灰を投
入し、下部の給水管３より水を連続的に導入し、
ゆるやかな撹拌下に消石灰を溶解させ略飽和の消
石灰水溶液を上部の流出管４より取り出す。この
第１の溶解槽では予め投入した消石灰の80重量％
以下、流出液のPHが12を割らない程度に溶解させ
る。第１の溶解槽での未溶解分はスラリー状で第
２の溶解槽に移し水を給水管５より連続的に導入
し、流出管６よりPH10以下の消石灰水溶液が得ら
れる。第１及び第２の溶解槽より流出する消石灰
水溶液は着水井７に送られ水道水のPH調整に供さ
れる。 In the attached diagram, 1 is the first dissolving tank and 2 is the second dissolving tank. Both dissolving tanks have a stirrer inside, and the raw water flows from the bottom of the first tank to the bottom or top of the second tank. The slaked lime aqueous solution is supplied from the top, and the slaked lime aqueous solution is taken out from the top. A considerable amount of slaked lime for continuous operation, for example, for two days, is charged in advance into this first dissolution tank, and water is continuously introduced from the water supply pipe 3 at the bottom,
The slaked lime is dissolved under gentle stirring, and a substantially saturated slaked lime aqueous solution is taken out from the upper outlet pipe 4. In this first dissolution tank, 80% by weight of the slaked lime added in advance
Next, dissolve the solution to such an extent that the pH of the effluent does not drop below 12. The undissolved content in the first dissolution tank is transferred in slurry form to the second dissolution tank, water is continuously introduced from the water supply pipe 5, and an aqueous slaked lime solution with a pH of 10 or less is obtained from the outflow pipe 6. The slaked lime aqueous solution flowing out from the first and second dissolution tanks is sent to the receiving well 7 and used to adjust the pH of tap water.
尚第１の溶解槽の未溶解分は一度に第２の溶解
槽に移し、第２の溶解槽に水のみを連続的に導入
する如く運転してもよいが、他の態様としては第
１の溶解槽の未溶解分は一旦ストツクタンク８に
貯め、第２の溶解槽へポンプ９により定量的に連
続的に供給してもよい。 Note that the undissolved content of the first dissolution tank may be transferred to the second dissolution tank at once, and the operation may be performed such that only water is continuously introduced into the second dissolution tank. The undissolved content in the second dissolution tank may be temporarily stored in a stock tank 8 and then quantitatively and continuously supplied to a second dissolution tank by a pump 9.
本発明の実施に際しては第１の溶解槽と第２の
溶解槽とは並行して運転され、略一定PHの消石灰
水溶液が連続的定量的に得られ、水道水のPH調整
が安定して行い得る。 When carrying out the present invention, the first dissolution tank and the second dissolution tank are operated in parallel, and a slaked lime aqueous solution with a substantially constant pH is obtained continuously and quantitatively, and the pH of tap water can be stably adjusted. obtain.
附図は本発明の実施に用いる装置の１例を示
す。
１…第１の溶解槽、２…第２の溶解槽、３，５
…給水管、４，６…流出管、７…着水井、８…ス
トツクタンク、９…ポンプ。
The accompanying drawing shows an example of an apparatus used to carry out the present invention. 1...First dissolution tank, 2...Second dissolution tank, 3, 5
...Water supply pipe, 4, 6...Outflow pipe, 7...Water landing well, 8...Stock tank, 9...Pump.
Claims (1)
PHを調整する方法において、第１溶解槽で供給消
石灰の80重量％以上を溶解させるまで該槽に水を
供給しつつ、消石灰略飽和水溶液を取り出した後
未溶解分を第２溶解槽に移し該槽に水を供給しつ
つ溶解させてPH10以下の消石灰水溶液とし、両溶
解槽より得た消石灰水溶液を連続的に着水井に供
給することを特徴とする水道水のPH調整方法。1. Injecting a nearly saturated aqueous solution of slaked lime into tap water.
In the method of adjusting PH, water is supplied to the first dissolving tank until 80% by weight or more of the supplied slaked lime is dissolved, and after an approximately saturated aqueous solution of slaked lime is taken out, the undissolved portion is transferred to the second dissolving tank. A method for adjusting the pH of tap water, which comprises supplying water to the tank and dissolving it into a slaked lime aqueous solution having a pH of 10 or less, and continuously supplying the slaked lime aqueous solution obtained from both dissolving tanks to a receiving well.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10656482A JPS58223481A (en) | 1982-06-21 | 1982-06-21 | Method for controlling ph of tap water |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10656482A JPS58223481A (en) | 1982-06-21 | 1982-06-21 | Method for controlling ph of tap water |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58223481A JPS58223481A (en) | 1983-12-26 |
| JPS6223634B2 true JPS6223634B2 (en) | 1987-05-25 |
Family
ID=14436783
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10656482A Granted JPS58223481A (en) | 1982-06-21 | 1982-06-21 | Method for controlling ph of tap water |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58223481A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01168231U (en) * | 1988-05-20 | 1989-11-27 | ||
| JPH01168230U (en) * | 1988-05-20 | 1989-11-27 |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6434490A (en) * | 1987-07-28 | 1989-02-03 | Yoshinori Yasuda | Mineral liquid and manufacture thereof |
| JP3105309B2 (en) * | 1991-10-09 | 2000-10-30 | 呉羽化学工業株式会社 | Method and apparatus for improving tap water |
-
1982
- 1982-06-21 JP JP10656482A patent/JPS58223481A/en active Granted
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01168231U (en) * | 1988-05-20 | 1989-11-27 | ||
| JPH01168230U (en) * | 1988-05-20 | 1989-11-27 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58223481A (en) | 1983-12-26 |
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