JPH0613117B2 - Method for treating wastewater containing salts, silica and organic matter - Google Patents
Method for treating wastewater containing salts, silica and organic matterInfo
- Publication number
- JPH0613117B2 JPH0613117B2 JP61020351A JP2035186A JPH0613117B2 JP H0613117 B2 JPH0613117 B2 JP H0613117B2 JP 61020351 A JP61020351 A JP 61020351A JP 2035186 A JP2035186 A JP 2035186A JP H0613117 B2 JPH0613117 B2 JP H0613117B2
- Authority
- JP
- Japan
- Prior art keywords
- silica
- containing salts
- organic matter
- wastewater
- wastewater containing
- 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 - Lifetime
Links
Description
【発明の詳細な説明】 〔産業上の利用分野〕 この発明は廃水の処理方法に係り、特に塩類、シリカ及
び有機物を含有する廃水の処理方法に関する。TECHNICAL FIELD The present invention relates to a method for treating wastewater, and more particularly to a method for treating wastewater containing salts, silica and organic substances.
例えばカラーブラウン管製造工程からは塩類、シリカ及
び有機物を含有する廃水が排出される。近年工業用水の
取得が困難になるとともに、所定の処理をした廃水に対
して、さらに脱塩処理し、工業用水として再利用するシ
ステムをとることが多くなってきている。従来この種の
廃水は硫酸バンド添加による凝集沈でん及びＣａ添加に
よるアルカリ凝集沈でんによりシリカを除去し活性炭な
どにより有機物を除去したのち逆浸透装置に通し処理し
ている。ところで従来法によると凝集沈でん時、沈降性
を改善する目的で使用する高分子凝集剤は後段の逆浸透
装置へ悪影響を起し使用できないため、凝集フロックの
沈降性が悪く、またシリカの除去性も十分でないため膜
汚染を起こす欠点があった。また、シリカと有機物を個
別に処理するため、操作が複雑になっていた。For example, wastewater containing salts, silica and organic substances is discharged from the color cathode ray tube manufacturing process. In recent years, it has become difficult to obtain industrial water, and waste water that has been subjected to a predetermined treatment is desalted and reused as industrial water. Conventionally, this type of waste water is treated by passing through a reverse osmosis apparatus after removing silica by coagulating sedimentation by adding sulfuric acid band and alkali coagulating sedimentation by adding Ca and organic substances by activated carbon. By the way, according to the conventional method, the polymer flocculant used for the purpose of improving the sedimentation property during coagulation sedimentation has a bad influence on the reverse osmosis device in the subsequent stage and cannot be used, so that the flocculation flocs have poor sedimentation property and silica removal property However, there is a drawback that the film is contaminated because it is not sufficient. Further, since the silica and the organic substance are treated separately, the operation is complicated.
発明の目的は前記従来技術の欠点を解消し、シリカ、有
機物を含有する廃水を簡易な操作で効率良く除去し、膜
汚染を少なくする方法を提供するにある。An object of the present invention is to solve the above-mentioned drawbacks of the prior art and to provide a method for efficiently removing wastewater containing silica and organic substances by a simple operation to reduce membrane contamination.
本発明はシリカ及び有機物を同時に効率良く処理し、膜
汚染を少なくする手段として廃水に鉱酸を添加して廃水
のpHを約３に調節後第二鉄塩を添加し、次いでCa(OH)2
を添加してpHを約４とした後、アルカリ剤を添加して中
性とし、生成した沈でん物を除去後、逆浸透装置に通す
ように構成したものである。According to the present invention, as a means for efficiently treating silica and organic substances at the same time and reducing membrane contamination, mineral acid is added to the wastewater to adjust the pH of the wastewater to about 3 and then ferric salt is added, and then Ca (OH) 2 is added. 2
Is added to adjust the pH to about 4, then an alkaline agent is added to neutralize the precipitate, and the resulting precipitate is removed and then passed through a reverse osmosis device.
第二鉄塩は、水中に溶けて水酸化第二鉄を形成し、凝集
作用及び共沈作用を奏し、水中の有機物の除去には有効
であるが、単独ではシリカを十分に除去できない。ま
た、Ca(OH)2はシリカの除去には有効であるが、単独で
は有機物の除去には不十分である。しかし第二鉄塩及び
Ca(OH)2を併用すると、廃水中のシリカ及び有機物を同
時に、しかも効率良く除去することができる。The ferric salt dissolves in water to form ferric hydroxide, has a coagulation action and a coprecipitation action, and is effective in removing organic substances in water, but cannot remove silica sufficiently by itself. Further, Ca (OH) 2 is effective for removing silica, but alone is not sufficient for removing organic substances. But ferric salt and
When Ca (OH) 2 is used in combination, silica and organic matter in the wastewater can be removed simultaneously and efficiently.
また本発明方法によれば、廃水に第二鉄塩、及びCa(OH)
2を添加混合後、廃水のpHを中性に調整するだけで処理
できるので操作は極めて簡単である。Further, according to the method of the present invention, ferric salt in the wastewater, and Ca (OH)
After adding and mixing 2 , the process can be performed simply by adjusting the pH of the wastewater to neutral, so the operation is extremely simple.
カラーブラウン管製造工程から排出された塩類、シリカ
及び有機物を含有する廃水に、硫酸を添加して廃水のpH
を３に調節後、Fecl3・6H2Oを８００mg／添加し、次い
でCa(OH)2を添加してpH４として後、NaOHでpH６とし、
沈でん物を生成させた後固液分離した。The pH of the wastewater by adding sulfuric acid to the wastewater containing salts, silica and organic substances discharged from the color cathode ray tube manufacturing process.
After adjusting to 3, Fecl 3 · 6H 2 O was added at 800mg /, and then Ca (OH) 2 was added to adjust the pH to 4 and then adjusted to pH 6 with NaOH.
After forming a precipitate, solid-liquid separation was performed.
得られた上澄水について、水質及びＦＩ値（膜汚れ係
数）を測定し本発明による処理効果を確認した。結果を
表１に示す 表１から明らかなように、本発明の方法によれば上澄水
中のSiO2濃度1.99mg／、ＣＯＤ濃度10mg／に減少し
ＦＩ値も3.81と小さく膜汚染が少なくできる顕著な効果
が認められた。The water quality and FI value (film fouling coefficient) of the obtained supernatant water were measured to confirm the treatment effect according to the present invention. The results are shown in Table 1. As is clear from Table 1, according to the method of the present invention, the SiO 2 concentration in the supernatant water was reduced to 1.99 mg /, the COD concentration was reduced to 10 mg /, and the FI value was as small as 3.81 and a remarkable effect that film contamination was reduced was recognized. It was
以上説明したごとく、本発明の方法によれば、塩類、シ
リカ及び有機物を含有する廃水を簡易な操作で効率良
く、又膜汚染を少なく処理できる効果がある。As described above, according to the method of the present invention, there is an effect that wastewater containing salts, silica, and organic substances can be efficiently treated with a simple operation and less membrane contamination.
Claims (1)
浄化する処理方法において、廃水に鉱酸を添加して廃水
のpHを約３に調節後、第二鉄塩を添加し、次いでCa(OH)
2を添加してpHを約４とした後、アルカリ剤を添加して
中性とし、生成した沈でん物を除去した後、逆浸透装置
に通すことを特徴とする塩類、シリカ及び有機物を含有
する廃水の処理方法。1. In a treatment method for purifying wastewater containing salts, silica and organic matter, after adding mineral acid to the wastewater to adjust the pH of the wastewater to about 3, ferric salt is added, and then Ca ( OH)
After adding 2 to bring the pH to about 4, add an alkaline agent to make it neutral, remove the formed precipitate, and then pass through a reverse osmosis unit containing salts, silica and organic matter. Waste water treatment method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61020351A JPH0613117B2 (en) | 1986-02-03 | 1986-02-03 | Method for treating wastewater containing salts, silica and organic matter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61020351A JPH0613117B2 (en) | 1986-02-03 | 1986-02-03 | Method for treating wastewater containing salts, silica and organic matter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62180793A JPS62180793A (en) | 1987-08-08 |
| JPH0613117B2 true JPH0613117B2 (en) | 1994-02-23 |
Family
ID=12024699
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61020351A Expired - Lifetime JPH0613117B2 (en) | 1986-02-03 | 1986-02-03 | Method for treating wastewater containing salts, silica and organic matter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0613117B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3187629B2 (en) * | 1993-12-16 | 2001-07-11 | オルガノ株式会社 | Reverse osmosis membrane treatment method |
| US5587083A (en) * | 1995-04-17 | 1996-12-24 | Chemetics International Company Ltd. | Nanofiltration of concentrated aqueous salt solutions |
-
1986
- 1986-02-03 JP JP61020351A patent/JPH0613117B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62180793A (en) | 1987-08-08 |
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