JPS6232994B2 - - Google Patents
Info
- Publication number
- JPS6232994B2 JPS6232994B2 JP58162925A JP16292583A JPS6232994B2 JP S6232994 B2 JPS6232994 B2 JP S6232994B2 JP 58162925 A JP58162925 A JP 58162925A JP 16292583 A JP16292583 A JP 16292583A JP S6232994 B2 JPS6232994 B2 JP S6232994B2
- Authority
- JP
- Japan
- Prior art keywords
- calcium
- biological treatment
- fluorine
- organic 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
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- Removal Of Specific Substances (AREA)
Description
【発明の詳細な説明】
この発明は、フツ素を含む有機性廃水の処理に
関し、特に、フツ素の沈殿除去に必要なカルシウ
ム分の低減をはかるものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the treatment of organic wastewater containing fluorine, and in particular aims to reduce the calcium content necessary for the precipitation and removal of fluorine.
従来、フツ素を含む廃水は、カルシウム塩また
は水酸化カルシウムを添加することにより、フツ
素イオンを不溶性のフツ化カルシウムとし、沈殿
除去していた。しかし、フツ素以外の反応物、た
とえば、硝酸や酢酸が存在しているとカルシウム
は、フツ素と選択的に反応するわけではないので
溶解性の硝酸カルシウムや酢酸カルシウムとな
り、フツ素除去に有効に利用されなかつた。 Conventionally, wastewater containing fluorine has been removed by precipitation by adding calcium salt or calcium hydroxide to convert the fluorine ions into insoluble calcium fluoride. However, in the presence of reactants other than fluorine, such as nitric acid and acetic acid, calcium does not react selectively with fluorine, resulting in soluble calcium nitrate and calcium acetate, which are effective in removing fluorine. It was not used.
本発明者等は、有機性廃水を生物処理すると、
二酸化炭素が発生し、これがカルシウムイオンと
反応して炭酸カルシウムの沈殿が生成するという
知見に基き、カルシウムをフツ素除去に有効に利
用することを見い出した。すなわち、本発明は、
フツ素を含む有機性廃水にカルシウム化合物を添
加し、フツ化カルシウムの沈殿を除去したのち、
その分離液を生物処理し、生物処理で生成した炭
酸カルシウムを含む余剰汚泥を、前記廃水と混合
することを特徴とするフツ素を含む有機性廃水の
処理法である。 The present inventors have demonstrated that when organic wastewater is treated biologically,
Based on the knowledge that carbon dioxide is generated and reacts with calcium ions to form calcium carbonate precipitates, the inventors have discovered that calcium can be effectively used to remove fluoride. That is, the present invention
After adding calcium compounds to organic wastewater containing fluorine and removing calcium fluoride precipitates,
This method of treating organic wastewater containing fluorine is characterized by subjecting the separated liquid to biological treatment and mixing surplus sludge containing calcium carbonate produced by the biological treatment with the wastewater.
本発明に使用するカルシウム化合物は、
CaCl2、CaSO4、CaSO3、CaCO3、Ca（OH）2な
どであるが、フツ素を含む有機性廃水が酸性であ
ればCa（OH）2を用いると中和剤を兼ねるので好
ましい。 The calcium compound used in the present invention is
Examples include CaCl 2 , CaSO 4 , CaSO 3 , CaCO 3 , Ca(OH) 2 and the like, but if the organic wastewater containing fluorine is acidic, Ca(OH) 2 is preferably used since it also serves as a neutralizing agent.
本発明における生物処理は、分離液を空気（酸
素）と接触させて微生物を増殖させ、分離液中の
有機物を分解するもので、浮遊微生物による一般
的な活性汚泥法およびその変法、粒子担体に活性
汚泥を付着させ流動化させて処理する流動床法、
回転円板に活性汚泥を付着させて処理する回転円
板法、曝気槽内にハニカム等の固定床を設けて接
触させる接触酸化法、嫌気性細菌により嫌気的に
分解する方法など、従来より採用されている方法
が採用でき、いずれの方法でもよい。これらの場
合、嫌気処理と組み合せて脱リンを行う方法、あ
るいは嫌気的な脱窒処理と組合せて脱窒素を行う
方法も採用できる。 The biological treatment in the present invention involves bringing the separated liquid into contact with air (oxygen) to grow microorganisms and decomposing organic matter in the separated liquid. Fluidized bed method, in which activated sludge is attached to and fluidized for treatment.
Conventionally adopted methods include the rotating disk method, in which activated sludge is attached to a rotating disk, the contact oxidation method, in which a fixed bed such as a honeycomb is placed in an aeration tank, and the method in which sludge is decomposed anaerobically using anaerobic bacteria. Any method can be used. In these cases, a method of performing dephosphorization in combination with anaerobic treatment, or a method of performing denitrification in combination with anaerobic denitrification treatment can also be adopted.
本発明では、フツ素を含む有機性廃水に、まず
カルシウム化合物、例えば、Ca（OH）2を添加す
る。廃水中のフツ素イオンは、カルシウムイオン
と反応し、不溶性のフツ化カルシウムとなり、大
部分は沈殿物となる。この沈殿物を除去したの
ち、分離液は前記した生物処理を行う。この生物
処理は、PH７以上の条件で行うのが好ましい。PH
調整は、前述のカルシウム化合物の添加時に行つ
てもよいし、フツ化カルシウムを除去したのちの
分離液に調整剤を添加して行つてもよい。もちろ
ん、生物処理中に行つてもよい。 In the present invention, a calcium compound, for example, Ca(OH) 2 is first added to organic wastewater containing fluorine. Fluorine ions in wastewater react with calcium ions to form insoluble calcium fluoride, most of which becomes precipitates. After removing this precipitate, the separated liquid is subjected to the biological treatment described above. This biological treatment is preferably carried out under conditions of pH 7 or higher. PH
The adjustment may be carried out at the time of addition of the above-mentioned calcium compound, or may be carried out by adding a regulating agent to the separated liquid after removing calcium fluoride. Of course, it may also be carried out during biological treatment.
分離液を好気的に生物処理すると、有機物の分
離に伴い、二酸化炭素が発生し、溶解しているカ
ルシウムイオンと反応し、不溶性の炭酸カルシウ
ムが生成する。生成した炭酸カルシウムは微生物
フロツクと一体になつており、通常、沈殿槽で沈
殿分離する。沈殿汚泥の一部は、返送汚泥として
生物処理の工程に戻され、残部は余剰汚泥とな
る。この余剰汚泥中には、炭酸カルシウムが含ま
れているので、原水であるフツ素を含む有機性廃
水と混合し、カルシウム分をフツ素除去に用い
る。カルシウム分が不足していれば、さらに、カ
ルシウム化合物を添加すればよい。次に、固液分
離を行い、上澄液は前述と同様に生物処理を行
う。分離汚泥は脱水等適宜、処分する。 When the separated liquid is subjected to aerobic biological treatment, carbon dioxide is generated as organic matter is separated, and reacts with dissolved calcium ions to produce insoluble calcium carbonate. The produced calcium carbonate is integrated with microbial flocs and is usually separated by precipitation in a settling tank. A portion of the settled sludge is returned to the biological treatment process as return sludge, and the remainder becomes surplus sludge. This excess sludge contains calcium carbonate, so it is mixed with raw water, organic wastewater containing fluorine, and the calcium content is used to remove fluorine. If the calcium content is insufficient, a calcium compound may be further added. Next, solid-liquid separation is performed, and the supernatant liquid is subjected to biological treatment in the same manner as described above. The separated sludge will be dehydrated and disposed of as appropriate.
余剰汚泥を、フツ素を含む有機性廃水と混合す
る際、廃水が中性ないしアルカリ性である場合に
は、鉱酸を添加して、炭酸カルシウムを溶解する
と反応性が高まり好ましい。 When excess sludge is mixed with organic wastewater containing fluorine, if the wastewater is neutral or alkaline, it is preferable to add mineral acid to dissolve calcium carbonate to increase reactivity.
本発明によれば、生物処理で生成した炭酸カル
シウムを含む余剰汚泥を、原水であるフツ素を含
む有機性廃水と混合するので、カルシウムをフツ
素の除去に有効に利用することができる。 According to the present invention, surplus sludge containing calcium carbonate produced by biological treatment is mixed with organic wastewater containing fluorine, which is raw water, so that calcium can be effectively used for removing fluorine.
実施例
HF2900mg／、HNO310000mg／、酢酸6000
mg／を含有する廃水（BOD4800mg／）に、
Ca（OH）2を15000mg／添加して中和（PH７）
とするとともに不溶性のCaF2を生成させ、アニ
オン性高分子凝集剤（ポリアクリルアミドの部分
加水分解物）を５mg／添加して凝集沈殿したと
ころ、F7.1mg／、Ca5310mg／の上澄液が得
られた。この上澄液を４日滞留の嫌気的な生物脱
窒槽に導き、脱窒素したのち、曝気処理（滞留時
間6hr）し、沈殿槽で固液分離したところ、処理
水のPHは7.7〜8.0、Ｆは2.4mg／、BODは20
mg／以下、Caは平均490mg／であつた。発生
した余剰汚泥全量を原水と混合し、さらにCa
（OH）2でPHを７としたところ、Ca（OH）2の添加
量は6200mg／に低減できた。ひきつづき、同様
に凝集沈殿、生物処理を行い、同水質の処理水を
得た。Example HF2900mg/, HNO 3 10000mg/, acetic acid 6000
In wastewater containing mg/(BOD4800mg/),
Neutralize by adding 15000mg/Ca(OH) 2 (PH7)
At the same time, insoluble CaF 2 was generated, and 5 mg/anionic polymer flocculant (partial hydrolyzate of polyacrylamide) was added to coagulate and precipitate, resulting in a supernatant of 7.1 mg/F and 5310 mg/ Ca. It was done. This supernatant liquid was led to an anaerobic biological denitrification tank where it was retained for 4 days, denitrified, then aerated (retention time 6 hours), and solid-liquid separated in a sedimentation tank.The pH of the treated water was 7.7 to 8.0. F is 2.4mg/, BOD is 20
mg/or less, and Ca was 490 mg/on average. The entire amount of excess sludge generated is mixed with raw water, and further Ca
When the pH was set to 7 with (OH) 2 , the amount of Ca(OH) 2 added could be reduced to 6200mg/. Subsequently, coagulation and sedimentation and biological treatment were performed in the same manner to obtain treated water of the same quality.
Claims (1)
を添加し、フツ化カルシウムの沈殿を除去したの
ち、その分離液を生物処理し、生物処理で生成し
た炭酸カルシウムを含む余剰汚泥を、前記廃水と
混合することを特徴とするフツ素を含む有機性廃
水の処理法。1. After adding a calcium compound to organic wastewater containing fluorine and removing precipitates of calcium fluoride, the separated liquid is subjected to biological treatment, and excess sludge containing calcium carbonate produced by the biological treatment is mixed with the wastewater. A method for treating organic wastewater containing fluorine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58162925A JPS6054784A (en) | 1983-09-05 | 1983-09-05 | Treatment of organic waste water containing fluorine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58162925A JPS6054784A (en) | 1983-09-05 | 1983-09-05 | Treatment of organic waste water containing fluorine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6054784A JPS6054784A (en) | 1985-03-29 |
| JPS6232994B2 true JPS6232994B2 (en) | 1987-07-17 |
Family
ID=15763839
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58162925A Granted JPS6054784A (en) | 1983-09-05 | 1983-09-05 | Treatment of organic waste water containing fluorine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6054784A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62152597A (en) * | 1985-12-25 | 1987-07-07 | Naigai Kagaku Seihin Kk | Waste water treatment |
| JP2001276851A (en) * | 2000-03-29 | 2001-10-09 | Japan Organo Co Ltd | Drain treatment equipment |
| JP4685224B2 (en) * | 2000-09-12 | 2011-05-18 | オルガノ株式会社 | Waste water treatment method and waste water treatment equipment |
-
1983
- 1983-09-05 JP JP58162925A patent/JPS6054784A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6054784A (en) | 1985-03-29 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |