JPH01231989A - Treatment of waste water - Google Patents
Treatment of waste waterInfo
- Publication number
- JPH01231989A JPH01231989A JP5980788A JP5980788A JPH01231989A JP H01231989 A JPH01231989 A JP H01231989A JP 5980788 A JP5980788 A JP 5980788A JP 5980788 A JP5980788 A JP 5980788A JP H01231989 A JPH01231989 A JP H01231989A
- Authority
- JP
- Japan
- Prior art keywords
- waste water
- ferric
- calcium
- fluorine
- added
- 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
- 239000002351 wastewater Substances 0.000 title claims abstract description 30
- 239000011737 fluorine Substances 0.000 claims abstract description 24
- 229910052731 fluorine Inorganic materials 0.000 claims abstract description 24
- 150000003839 salts Chemical class 0.000 claims abstract description 18
- 239000002244 precipitate Substances 0.000 claims abstract description 13
- 159000000007 calcium salts Chemical class 0.000 claims abstract description 12
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 6
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 claims abstract 5
- 239000000126 substance Substances 0.000 claims description 8
- 238000004065 wastewater treatment Methods 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 13
- 229960004887 ferric hydroxide Drugs 0.000 abstract description 8
- IEECXTSVVFWGSE-UHFFFAOYSA-M iron(3+);oxygen(2-);hydroxide Chemical compound [OH-].[O-2].[Fe+3] IEECXTSVVFWGSE-UHFFFAOYSA-M 0.000 abstract description 8
- 238000005273 aeration Methods 0.000 abstract description 7
- 229910021578 Iron(III) chloride Inorganic materials 0.000 abstract description 4
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 abstract description 4
- 239000003638 chemical reducing agent Substances 0.000 abstract description 4
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 abstract description 4
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 abstract description 3
- 239000001110 calcium chloride Substances 0.000 abstract description 3
- 229910001628 calcium chloride Inorganic materials 0.000 abstract description 3
- RUTXIHLAWFEWGM-UHFFFAOYSA-H iron(3+) sulfate Chemical compound [Fe+3].[Fe+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O RUTXIHLAWFEWGM-UHFFFAOYSA-H 0.000 abstract description 2
- 229910000360 iron(III) sulfate Inorganic materials 0.000 abstract description 2
- 239000003513 alkali Substances 0.000 abstract 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 9
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 6
- 229910001634 calcium fluoride Inorganic materials 0.000 description 6
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 3
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 3
- 239000000920 calcium hydroxide Substances 0.000 description 3
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 3
- 229910001424 calcium ion Inorganic materials 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000001556 precipitation Methods 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 229920006318 anionic polymer Polymers 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 238000000975 co-precipitation Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- FLTRNWIFKITPIO-UHFFFAOYSA-N iron;trihydrate Chemical compound O.O.O.[Fe] FLTRNWIFKITPIO-UHFFFAOYSA-N 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 238000010979 pH adjustment Methods 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
Landscapes
- Separation Of Suspended Particles By Flocculating Agents (AREA)
- Removal Of Specific Substances (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、還元性物質及びフッ素を含む廃水の処理方法
に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for treating wastewater containing reducing substances and fluorine.
廃水中に含まれているフッ素を除去する方法としては、
カルシウム塩を用いるフッ化カルシウム沈殿法が一般的
に行われている。また、フッ化カルシウムを沈殿させる
際に、第二鉄塩を添加して水酸化第二鉄の沈殿とフッ化
カルシウムを共沈させることも知られている。As a method to remove fluorine contained in wastewater,
Calcium fluoride precipitation methods using calcium salts are commonly practiced. It is also known that when precipitating calcium fluoride, a ferric salt is added to cause the precipitation of ferric hydroxide and calcium fluoride to co-precipitate.
しかしながら、この処理方法において、廃水中に還元性
物質が混入して（ると、添加したＦｅ”がＦｅ”°に還
元され、水酸化第二鉄の沈殿を生成しないので、処理水
中に混入する。このＦｅＺ ＊の混入した処理水は、着
色すると同時に、ｐ ｅ Ｚ ＋ とＦ〜が錯イオンを
形成するため、フッ素濃度も高くなる。However, in this treatment method, reducing substances are mixed into the wastewater (then the added Fe" is reduced to Fe"°, and no precipitate of ferric hydroxide is produced, so the reducing substances are mixed into the treated water. The treated water mixed with FeZ* is colored and, at the same time, has a high fluorine concentration because p e Z + and F~ form a complex ion.
従って、本発明は、前記の従来技術の欠点を解消し、フ
ッ素含有廃水中に還元性物質が混入していても、廃水中
のフッ素を効果的に除去することができるフッ素含有廃
水の処理方法を提供することを目的とする。Therefore, the present invention provides a method for treating fluorine-containing wastewater that overcomes the drawbacks of the prior art and can effectively remove fluorine from wastewater even if reducing substances are mixed in the fluorine-containing wastewater. The purpose is to provide
（課題を解決するための手段及びその作用）本発明は、
曝気下に沈殿を生成さセることによって前記の課題を解
決したものである。(Means for solving the problems and their effects) The present invention includes:
The above-mentioned problem was solved by generating a precipitate under aeration.
即ち、本発明による廃水の処理方法は、還元性゛物質及
びフッ素を含む廃水にｐＨ４以下の条件下でカルシウム
塩、次いで第二鉄塩を添加し、その後、アルカリ剤でｐ
Ｈを中性付近とし、曝気しながら沈澱物を生成させるこ
とを特徴とする。That is, the method for treating wastewater according to the present invention involves adding calcium salts and then ferric salts to wastewater containing reducing substances and fluorine under conditions of pH 4 or less, and then plating the wastewater with an alkaline agent.
It is characterized in that H is near neutral and a precipitate is generated while being aerated.
本発明方法においては、まず、廃水のｐＨを４以下に調
整する。廃水のｐＨが４を超えると、第二鉄塩を添加し
たときに、第二鉄塩が水酸化第二鉄として単独で沈殿し
てしまうので、この段階では好ましくない。In the method of the present invention, first, the pH of the wastewater is adjusted to 4 or less. If the pH of the wastewater exceeds 4, the ferric salt will precipitate alone as ferric hydroxide when the ferric salt is added, which is not preferred at this stage.
ｐＨ調整後、カルシウム塩を添加する。カルシウム塩の
添加量は、廃水中のフッ素に対して反応当量の１〜２当
量であるのが好ましい。次いで、第二鉄塩を添加する。After pH adjustment, calcium salt is added. The amount of calcium salt added is preferably 1 to 2 reaction equivalents relative to fluorine in the wastewater. The ferric salt is then added.
廃水への第二鉄塩の添加量は５０ｍｇ／ｊ２以上である
のが好ましい。第二鉄塩の添加量は、多い程、処理水中
のフッ素濃度は低下するので、フッ素濃度の目標値及び
経済性を考慮して適宜決定すればよい。カルシウム塩の
添加により、カルシウムイオンは廃水中のフッ素と反応
してフッ化カルシウムとなる。第二鉄塩は、次工程にお
いて水酸化第二鉄として沈殿する際に、フッ化カルシウ
ムを共沈させる作用をする。The amount of ferric salt added to the wastewater is preferably 50 mg/j2 or more. The amount of ferric salt added may be appropriately determined in consideration of the target value of fluorine concentration and economical efficiency, since the fluorine concentration in the treated water decreases as the amount increases. With the addition of calcium salts, calcium ions react with fluorine in the wastewater to form calcium fluoride. The ferric salt functions to co-precipitate calcium fluoride when it is precipitated as ferric hydroxide in the next step.
本発明方法に使用するカルシウム塩としては、硫酸カル
シウム、塩化カルシウム等がある。また、第二鉄塩とし
ては、塩化第二鉄、硫酸第二鉄等が挙げられる。Calcium salts used in the method of the present invention include calcium sulfate, calcium chloride, and the like. Furthermore, examples of ferric salts include ferric chloride, ferric sulfate, and the like.
上記のように廃水にカルシウム塩及び第二鉄塩を添加し
た後、アルカリ剤を添加してｐＨを中性付近、即ち、ｐ
Ｈ７〜８に調節する。アルカリ剤としては、水酸化カル
シウム、水酸化ナトリウム、水酸化カリウム等が挙げら
れるが、カルシウムイオンを供給しうるので、水酸化カ
ルシウムを使用するのが好ましい。After adding calcium salts and ferric salts to the wastewater as described above, an alkaline agent is added to adjust the pH to around neutrality, that is, p
Adjust to H7-8. Examples of the alkaline agent include calcium hydroxide, sodium hydroxide, potassium hydroxide, etc., but calcium hydroxide is preferably used because it can supply calcium ions.
本発明方法においては、ｐＨ調整後に、曝気しながら沈
殿物を生成させる。ここで、曝気すると、還元性物質の
存在によって生成していたＦ ｅ ２ ＋がＦ ｅ ３
＋に酸化され、水酸化第二鉄Ｆｅ（ＯＨ）３の沈殿が
生じる。また、過剰のカルシウムイオンは、炭酸カルシ
ウムＣａ ＣＯｚとなる。このＦｅ（ＯＨ）ｚ及びＣａ
Ｃ０＋により、フッ化カルシウムの沈降性が向上し、常
法で固液分離することができる。In the method of the present invention, after adjusting the pH, a precipitate is generated while being aerated. Here, when aeration is performed, the Fe 2 + generated due to the presence of the reducing substance becomes Fe 3
oxidized to +, resulting in the precipitation of ferric hydroxide Fe(OH)3. Moreover, excess calcium ions become calcium carbonate CaCOz. This Fe(OH)z and Ca
C0+ improves the sedimentation properties of calcium fluoride, allowing solid-liquid separation by a conventional method.
次に、実施例に基づいて本発明を詳述するが、本発明は
これに限定されるものではない。Next, the present invention will be described in detail based on Examples, but the present invention is not limited thereto.
実施例Ｉ
Ｆ＝１７０ｍｇ／ｊ２及び還元性物質３０ｍｇ／ｆを含
むｐＨ２，８の廃水に、該廃水中のフッ素に対して反応
当量の２倍の塩化カルシウムを添加し、更に塩化第二鉄
をＦｅ”として２５〜１５０■／２添加し、次いで、水
酸化カルシウムを添加してｐＨ７〜８とし、曝気しなが
ら反応させた。３０分間反応させた後、凝集剤としてア
ニオン系高分子凝集剤を１０■／！！、添加して凝集さ
せた後、固液分離し、得られた処理水のフッ素濃度を測
定し、結果を第１図に示す。Example I To wastewater with a pH of 2.8 containing F=170mg/j2 and 30mg/f of reducing substances, twice the reaction equivalent of calcium chloride with respect to fluorine in the wastewater was added, and ferric chloride was further added. Then, calcium hydroxide was added to adjust the pH to 7 to 8, and the reaction was carried out with aeration. After reacting for 30 minutes, an anionic polymer flocculant was added as a flocculant. After adding 10■/!! to cause flocculation, solid-liquid separation was performed, and the fluorine concentration of the resulting treated water was measured. The results are shown in FIG.
比較例１
曝気しないことを除いて、実施例１と同様に操作し、処
理水のフッ素濃度を測定し、結果を第２図に示す。Comparative Example 1 The same procedure as in Example 1 was carried out except that no aeration was performed, and the fluorine concentration of the treated water was measured. The results are shown in FIG.
第１図及び第２図から分かるように、本発明方法によれ
ば処理水のフッ素濃度を著しく低下することができ、そ
の際、塩化第二鉄の添加量を増加する程、処理水のフッ
素濃度は低下する。As can be seen from Figures 1 and 2, according to the method of the present invention, the fluorine concentration in the treated water can be significantly reduced, and in this case, as the amount of ferric chloride added increases, concentration decreases.
本発明方法により、廃水中にカルシウム塩及び第二鉄塩
を添加し、アルカリ剤を用いてｐＨを中性付近に調整し
た後、曝気下に沈殿物を生成させることによって、廃水
中に還元性物質が存在しても水酸化第二鉄の沈殿が生成
し、その共沈作用が得られる。従って、廃水中のフッ素
は効率よく除去され、処理水のフッ素濃度は著しく低下
する。According to the method of the present invention, calcium salts and ferric salts are added to wastewater, the pH is adjusted to around neutrality using an alkaline agent, and then a precipitate is generated under aeration. Even in the presence of the substance, a precipitate of ferric hydroxide is generated, resulting in a co-precipitation effect. Therefore, fluorine in wastewater is efficiently removed, and the fluorine concentration in treated water is significantly reduced.
第１図は実施例１における第二鉄塩の添加量と処理水の
フッ素濃度との関係を示すグラフ、第２図は比較例１に
おける第二鉄塩の添加量と処理水のフッ素濃度との関係
を示すグラフである。Figure 1 is a graph showing the relationship between the amount of ferric salt added and the fluorine concentration of the treated water in Example 1, and Figure 2 is a graph showing the relationship between the amount of ferric salt added and the fluorine concentration of the treated water in Comparative Example 1. It is a graph showing the relationship between.
Claims (1)
条件下でカルシウム塩、次いで第二鉄塩を添加し、その
後、アルカリ剤でｐＨを中性付近とし、曝気しながら沈
殿物を生成させることを特徴とする廃水の処理方法。(1) Add calcium salts and then ferric salts to wastewater containing reducing substances and fluorine under conditions of pH 4 or less, then adjust the pH to near neutrality with an alkaline agent and form a precipitate while aerating. A wastewater treatment method characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5980788A JPH01231989A (en) | 1988-03-14 | 1988-03-14 | Treatment of waste water |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5980788A JPH01231989A (en) | 1988-03-14 | 1988-03-14 | Treatment of waste water |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01231989A true JPH01231989A (en) | 1989-09-18 |
Family
ID=13123887
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5980788A Pending JPH01231989A (en) | 1988-03-14 | 1988-03-14 | Treatment of waste water |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01231989A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5630080A (en) * | 1979-08-20 | 1981-03-26 | Japan Steel Works Ltd:The | One-side welding method of joint made of pure copper and copper-nickel base alloy clad steel |
| JPS5734035A (en) * | 1980-08-05 | 1982-02-24 | Nippon Telegr & Teleph Corp <Ntt> | Preparation of optical fiber preform |
| JPS602916A (en) * | 1983-06-21 | 1985-01-09 | Seiko Epson Corp | Projection type liquid-crystal display device |
| JPS61271085A (en) * | 1985-05-25 | 1986-12-01 | Hitachi Plant Eng & Constr Co Ltd | Treatment of waste water containing fluorine |
-
1988
- 1988-03-14 JP JP5980788A patent/JPH01231989A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5630080A (en) * | 1979-08-20 | 1981-03-26 | Japan Steel Works Ltd:The | One-side welding method of joint made of pure copper and copper-nickel base alloy clad steel |
| JPS5734035A (en) * | 1980-08-05 | 1982-02-24 | Nippon Telegr & Teleph Corp <Ntt> | Preparation of optical fiber preform |
| JPS602916A (en) * | 1983-06-21 | 1985-01-09 | Seiko Epson Corp | Projection type liquid-crystal display device |
| JPS61271085A (en) * | 1985-05-25 | 1986-12-01 | Hitachi Plant Eng & Constr Co Ltd | Treatment of waste water containing fluorine |
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