JPS63224792A - Removal of phosphorus in waste water - Google Patents
Removal of phosphorus in waste waterInfo
- Publication number
- JPS63224792A JPS63224792A JP6081487A JP6081487A JPS63224792A JP S63224792 A JPS63224792 A JP S63224792A JP 6081487 A JP6081487 A JP 6081487A JP 6081487 A JP6081487 A JP 6081487A JP S63224792 A JPS63224792 A JP S63224792A
- Authority
- JP
- Japan
- Prior art keywords
- phosphorus
- waste water
- wastewater
- calcium phosphate
- contg
- 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.)
- Granted
Links
- 239000002351 wastewater Substances 0.000 title claims abstract description 38
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 title claims abstract description 32
- 239000011574 phosphorus Substances 0.000 title claims abstract description 32
- 229910052698 phosphorus Inorganic materials 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 claims abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 15
- 239000002244 precipitate Substances 0.000 claims abstract description 9
- 159000000007 calcium salts Chemical class 0.000 claims abstract description 8
- 239000001506 calcium phosphate Substances 0.000 claims description 20
- 229910000389 calcium phosphate Inorganic materials 0.000 claims description 20
- 235000011010 calcium phosphates Nutrition 0.000 claims description 20
- QORWJWZARLRLPR-UHFFFAOYSA-H tricalcium bis(phosphate) Chemical compound [Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O QORWJWZARLRLPR-UHFFFAOYSA-H 0.000 claims description 20
- 229910019142 PO4 Inorganic materials 0.000 abstract description 4
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-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
- 230000000694 effects Effects 0.000 abstract description 2
- 238000001556 precipitation Methods 0.000 abstract description 2
- 239000011575 calcium Substances 0.000 abstract 4
- 239000010452 phosphate Substances 0.000 abstract 3
- 239000006260 foam Substances 0.000 abstract 2
- 235000011148 calcium chloride Nutrition 0.000 abstract 1
- 150000003839 salts Chemical class 0.000 abstract 1
- 239000007864 aqueous solution Substances 0.000 description 7
- 238000005188 flotation Methods 0.000 description 4
- BCKXLBQYZLBQEK-KVVVOXFISA-M Sodium oleate Chemical compound [Na+].CCCCCCCC\C=C/CCCCCCCC([O-])=O BCKXLBQYZLBQEK-KVVVOXFISA-M 0.000 description 3
- JRBPAEWTRLWTQC-UHFFFAOYSA-N dodecylamine Chemical compound CCCCCCCCCCCCN JRBPAEWTRLWTQC-UHFFFAOYSA-N 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000003002 pH adjusting agent Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- WMFOQBRAJBCJND-UHFFFAOYSA-M Lithium hydroxide Chemical compound [Li+].[OH-] WMFOQBRAJBCJND-UHFFFAOYSA-M 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-L Phosphate ion(2-) Chemical compound OP([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-L 0.000 description 1
- 235000010575 Pueraria lobata Nutrition 0.000 description 1
- 241000219781 Pueraria montana var. lobata Species 0.000 description 1
- 239000003463 adsorbent Substances 0.000 description 1
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical class [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 235000014113 dietary fatty acids Nutrition 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 238000012851 eutrophication Methods 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000194 fatty acid Substances 0.000 description 1
- 229930195729 fatty acid Natural products 0.000 description 1
- 150000004665 fatty acids Chemical class 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 239000008394 flocculating agent Substances 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 125000001165 hydrophobic group Chemical group 0.000 description 1
- 229910052588 hydroxylapatite Inorganic materials 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 159000000014 iron salts Chemical class 0.000 description 1
- 239000003350 kerosene Substances 0.000 description 1
- 230000000813 microbial effect Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000010979 pH adjustment Methods 0.000 description 1
- XYJRXVWERLGGKC-UHFFFAOYSA-D pentacalcium;hydroxide;triphosphate Chemical compound [OH-].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O XYJRXVWERLGGKC-UHFFFAOYSA-D 0.000 description 1
- 150000003018 phosphorus compounds Chemical class 0.000 description 1
- 239000010665 pine oil Substances 0.000 description 1
- 230000002000 scavenging effect Effects 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- RYYKJJJTJZKILX-UHFFFAOYSA-M sodium octadecanoate Chemical compound [Na+].CCCCCCCCCCCCCCCCCC([O-])=O RYYKJJJTJZKILX-UHFFFAOYSA-M 0.000 description 1
- 159000000000 sodium salts Chemical class 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
Abstract
Description
【発明の詳細な説明】
〔技術分野〕
本発明はリン含有排水中からそれに含まれるリンを効率
的に分離除去する方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a method for efficiently separating and removing phosphorus contained in phosphorus-containing wastewater.
近年、各種リン系化合物の生産や消費が増加し、水域へ
のリンの排出量も増加している。このことが、閉鎖性水
域での富栄養化問題を引き起こす原因の一つになってい
る。排水中のリンの発生源は多岐にわたっており、閉鎖
性水域へ、これ以上の流出がないよう、発生源に於て適
切な処理を行う必要がある。排水中のリンの処理法につ
いては、従来より、各種の方法が研究されてきているが
、未だ十分と言える方法がないのが現状であり、効果的
な処理法の開発が望まれている。In recent years, the production and consumption of various phosphorus compounds has increased, and the amount of phosphorus discharged into water bodies has also increased. This is one of the causes of eutrophication problems in closed water bodies. There are many sources of phosphorus in wastewater, and appropriate treatment must be carried out at the source to prevent further leakage into closed water bodies. Various methods have been studied for treating phosphorus in wastewater, but there is currently no method that can be considered sufficient, and the development of an effective treatment method is desired.
リンの処理法としては、微生物処理法と物理化学的処理
法とに大きく分けられるが、排水中のリンの物理化学的
処理法として、最も一般的な方法は、「凝凍沈殿法」で
ある。その凝集剤の主なものとしは、アルミニウム塩、
鉄塩、およびカルシウム塩がある。これらの内で、比較
的簡単に使用でき、しかも経済的であるのは１′カルシ
ウム塩”である。しかし、この方法は、他の方法に比較
して、生成スラッジ景が多く、しかも沈降に時間がかか
るという欠点を有する。Phosphorus treatment methods are broadly divided into microbial treatment methods and physicochemical treatment methods, and the most common method for physicochemical treatment of phosphorus in wastewater is the "coagulation precipitation method." The main flocculants are aluminum salt,
There are iron salts and calcium salts. Among these, 1' calcium salt is relatively easy to use and economical.However, compared to other methods, this method produces more sludge and is less prone to sedimentation. It has the disadvantage of being time consuming.
本発明は、リン含有排水の処理に見られる前記欠点を克
服し、リン含有排水からそれに含まれるリンを効率的に
分離除去する方法を提供するものである。The present invention overcomes the above-mentioned drawbacks observed in the treatment of phosphorus-containing wastewater and provides a method for efficiently separating and removing phosphorus contained in the phosphorus-containing wastewater.
本発明によれば、リン含有排水を処理するに際し、該排
水に対し、Ｐ１１８以」；の条件下、該排水中に含まれ
るリンの少なくとも３倍当最のカルシウム塩を添加して
リン酸カルシウムの沈殿を生成させた後、このリン酸カ
ルシウムの沈殿を含む大気圧下の排水中に、空気加圧水
を心入し、その際に発生する微細気泡により該リン酸カ
ルシウ１１を浮上分離させることを特徴とする排水中の
リンの除去方法が提供される。According to the present invention, when treating phosphorus-containing wastewater, calcium salt is added to the wastewater in an amount of at least three times the amount of phosphorus contained in the wastewater under conditions of P118 or higher to precipitate calcium phosphate. After generating the calcium phosphate 11, air-pressurized water is introduced into the waste water under atmospheric pressure containing the calcium phosphate precipitate, and the calcium phosphate 11 is floated and separated by the fine bubbles generated at that time. A method is provided for removing phosphorus in.
本発明で処理対象となるリン含有排水には各種のものが
あるが、リン酸やリン酸イオン（ＩＩ、ＰＯ４、Ｈ７Ｐ
Ｏ，−１ＨＰＯ４”−１ｐｏ、’−）を含むものはいず
れも本発明により処理することができる。There are various types of phosphorus-containing wastewater that can be treated in the present invention, including phosphoric acid and phosphate ions (II, PO4, H7P).
O,-1HPO4''-1po,'-) can be treated according to the present invention.
本発明者らは、排水中のリン除去に関し、排水中のリン
を直接浮選させるイオン浮選法や、リンをいったん吸着
剤微粒子に吸着させて浮選する担体浮選法の研究を行っ
たが、いずれも良好な結果が得られず、本発明の方法が
最も効率的であることを見出した。Regarding the removal of phosphorus from wastewater, the present inventors conducted research on an ion flotation method in which phosphorus in wastewater is directly floated, and a carrier flotation method in which phosphorus is first adsorbed onto adsorbent fine particles and then floated. However, it was found that none of them gave good results and the method of the present invention was the most efficient.
本発明の方法では、先ず、リン含有排水に対して、カル
シウム塩を加え、排水中に含まれるリンと反応させてリ
ン酸カルシウムの沈殿を形成させる。この反応工程は従
来良く知られている工程である。この場合、カルシウム
塩としては、通常、塩化カルシウムが用いられる。この
カルシウム塩の添加量は、排水中に含まれるリンに対し
て少なくとも３倍当量、好ましくは４〜１０倍当景にす
るのがよい。In the method of the present invention, first, a calcium salt is added to phosphorus-containing wastewater and reacts with the phosphorus contained in the wastewater to form a calcium phosphate precipitate. This reaction step is a conventionally well known step. In this case, calcium chloride is usually used as the calcium salt. The amount of calcium salt added should be at least 3 times the amount of phosphorus contained in the waste water, preferably 4 to 10 times as much.
次に、前記のようにして得られたリン酸カルシウムの沈
殿を含む大気圧下の排水に対し、空気加圧水を導入し、
加圧水中に溶解していた空気を微細気泡として排水中を
放散上昇させ、この」二昇微細気泡によりリン酸カルシ
ウムの沈殿を浮」ニさせ、排水から分離する。空気加圧
水の製造は、空気を］−１０ｋｇ／ｃＪＧ、好ましくは
２−５ｋｇ／ｃＪＧの加圧空気と接触させることによっ
て得ることができる。この場合、接触時間は５分間以上
であればよく、通常１０〜２０分間程度である。また、
空気加圧水の使用割合は、排水ＩＱ当り、０．２〜０．
５Ｑ、好ましくは１〜２Ｑの割合である。Next, air-pressurized water is introduced into the atmospheric pressure wastewater containing the calcium phosphate precipitate obtained as described above,
The air dissolved in the pressurized water is made into fine bubbles that are dispersed and raised in the wastewater, and these fine bubbles float the calcium phosphate precipitate and separate it from the wastewater. The production of air pressurized water can be obtained by contacting air with pressurized air of ]-10 kg/cJG, preferably 2-5 kg/cJG. In this case, the contact time may be 5 minutes or more, and is usually about 10 to 20 minutes. Also,
The usage rate of air pressurized water is 0.2 to 0.0 per drainage IQ.
The ratio is 5Q, preferably 1 to 2Q.
本発明の方法において、排水にはそのリン酸カルシウム
沈殿形成時に、ｐＨ調節剤を添加し、そのｐＨを８以」
二、好ましくは９〜１０の範囲に調節するのがよい。こ
のようなｐＨ調節によって、高められたリン除去率を得
ることができる。このようなｐＨ条件下では、生成され
るリン酸カルシウムの大部分はヒドロキシアパタイトで
あり、このものが非常に浮−に１分離しやすい性質を有
するため、高いリン除去率を得ることができるものと考
えられる。ｐＨ調節剤としては、塩酸や水酸化す１〜リ
ウム等を用いることができる。In the method of the present invention, a pH adjuster is added to the wastewater at the time of calcium phosphate precipitate formation to adjust the pH to 8 or higher.
2, preferably adjusted to a range of 9 to 10. With such pH adjustment, increased phosphorus removal rates can be obtained. Under such pH conditions, most of the calcium phosphate produced is hydroxyapatite, which has the property of being very easy to separate into particles, which is why it is thought that a high phosphorus removal rate can be obtained. It will be done. As the pH adjuster, hydrochloric acid, mono-lithium hydroxide, etc. can be used.
また、本発明の方法においては、排水に対しては、フロ
ック捕集剤を添加することが非常に有利である。本発明
の場合、リン酸カルシウムの浮り分離工程では、排水は
撹拌されないため、リン酸カルシウ１１の粒子はフロッ
ク化されやすい。フロツク捕葉剤は、このようなフロッ
クに対して有効に作用し、フロックの気泡との結合によ
る浮」二を促進させる。フロック捕集剤を用いない場合
、排水中にはリン酸カルシウムのフロックが少量残留し
、処理水の透明性が損われる等の問題が残るが、フロッ
ク捕集剤を用いることにより、このような問題は解決さ
れる。フロック捕集剤としては、疎水基と親水基を持つ
界面活性剤、例えば、オレイン酸ナトリウムや、ステア
リン酸ナトリウムなどの高級脂肪酸のナトリウム塩や、
ラウリルアミン等の高級アミン等の捕集性を示す従来公
知の物質が用いられる他、ケロシンエマルジョン、パイ
ン油等を新捕集剤としてフロックに対して用いることが
できる。捕集剤の使用景は、排水ＩＱ当り、通常ｓ ｘ
ｔｏ−’モル−５Ｘ １０−３モル、好ましくは１０
４−モル−１０−３モル程度である。Furthermore, in the method of the invention, it is very advantageous to add a floc collector to the waste water. In the case of the present invention, the waste water is not stirred in the calcium phosphate floating separation step, so the calcium phosphate 11 particles are likely to become flocs. The flocculation agent effectively acts on such flocs and promotes their flotation by combining with air bubbles. If a floc collector is not used, problems such as a small amount of calcium phosphate flocs remaining in the wastewater and loss of transparency of the treated water remain, but by using a floc collector, these problems can be resolved. resolved. As the floc collector, surfactants having a hydrophobic group and a hydrophilic group, such as sodium salts of higher fatty acids such as sodium oleate and sodium stearate, are used.
In addition to conventionally known substances exhibiting scavenging properties for higher amines such as laurylamine, kerosene emulsion, pine oil, etc. can be used as new scavengers for flocs. The usage of the collection agent is usually s x per wastewater IQ
to-' moles-5X 10-3 moles, preferably 10
The amount is about 4-10-3 moles.
次に本発明を実施例によりさらに詳細に説明する。 Next, the present invention will be explained in more detail with reference to Examples.
実施例１
モデル排水として、リン酸水素二す１−リウム（Ｎａ２
ＨＰ０４）を１０−３モル含む水溶液（ＰＯ４３−とし
て９４ 、９７ｍｇ／ ｎ含む）を用いた。Example 1 As a model wastewater, di-1-lium hydrogen phosphate (Na2
An aqueous solution (containing 94, 97 mg/n as PO43-) containing 10-3 mol of HP04) was used.
この水溶液に対し、塩化カルシウムを添加し、リン酸カ
ルシウムの沈殿を形成した。この場合、ｐ）Ｉ調節剤を
加え、水溶液のｐｏを９〜１０の範囲内に調節した。Calcium chloride was added to this aqueous solution to form a calcium phosphate precipitate. In this case, a p)I regulator was added to adjust the po of the aqueous solution within the range of 9-10.
次に、このようにして得られたリン酸カルシウムを含む
水溶液２５０ｍΩを浮選槽に入れ、４ｋｇ／ｃｎｆＧの
圧力で空気を純水に圧入して形成した加圧水の２５０ｍ
葛を、その容器底部から導入し、１０分間静置して、リ
ン酸カルシウムの沈Ｗｌ−ｔｉ−水面」二に浮−１ニさ
せると共に、その浮上したリン酸カルシウムフロックを
除去した。Next, 250 mΩ of the aqueous solution containing calcium phosphate obtained in this way was placed in a flotation tank, and air was injected into the pure water at a pressure of 4 kg/cnfG to form 250 mΩ of pressurized water.
Kudzu was introduced from the bottom of the container and left to stand for 10 minutes to allow the calcium phosphate to float on the water surface, and the floating calcium phosphate flocs were removed.
次に、水溶液中に残留するリンの量をＰＯ４３−として
分析し、リン除去率を測定した。その結果を表−１に示
す。Next, the amount of phosphorus remaining in the aqueous solution was analyzed as PO43-, and the phosphorus removal rate was measured. The results are shown in Table-1.
表−１
実施例２
実施例】において、フロック捕集剤として、オレイン酸
ナトリウム又はラウリルアミンを併用し、ＣａＣＱ ２
／Ｎａ、ＨＰＯ，モル比＝３を用いた以外は同様にして
実験を行った。その結果、オレイン酸ナトリウムの場合
は、加圧水を含めた全水溶液５００ｍ Ｑに対し、５Ｘ
ｉＯ−４モル程度の添加量（溶液のｐＨ＝９．５２）で
、９８％のリン除去率が得られ、処理後の水溶液は清澄
なものであった。またラウリルアミンの場合、全水溶液
５００ｍ Ｑに対し、Ｉ Ｘ １０−’モルの添加量（
溶液のＰＨ＝９．２８）で９８％のリン除去率が得られ
、処理後の水溶液は清澄なものであった。Table 1 Example 2 In Example, sodium oleate or laurylamine was used in combination as a floc collector, and CaCQ 2
The experiment was conducted in the same manner except that /Na, HPO, molar ratio = 3 was used. As a result, in the case of sodium oleate, 5X
A phosphorus removal rate of 98% was obtained with an addition amount of approximately iO-4 mol (solution pH = 9.52), and the aqueous solution after treatment was clear. In the case of laurylamine, the amount added (I
A phosphorus removal rate of 98% was obtained when the pH of the solution was 9.28), and the aqueous solution after treatment was clear.
前記実験結果かられかるように、本発明によれば、排水
中からそれに含まれるリンを高い除去率で分離すること
ができ、しかもその分離処理は短時間で行い得るので非
常に効率的である。As can be seen from the above experimental results, according to the present invention, phosphorus contained in wastewater can be separated from wastewater at a high removal rate, and the separation process can be performed in a short time, making it very efficient. .
’ｉ）ｉ；：ｊ 荀１１０ テ「・ ワ で・：１ ユニ１'i)i;:j Xun 110 Te "・ Wa De・:1 Uni 1
Claims (1)
ｐＨ８以上の条件下、該排水中に含まれるリンの少なく
とも３倍当量のカルシウム塩を添加してリン酸カルシウ
ムの沈殿を生成させた後、このリン酸カルシウムの沈殿
を含む大気圧下の排水中に、空気加圧水を導入し、その
際に発生する微細気泡により該リン酸カルシウムを浮上
分離させることを特徴とする排水中のリンの除去方法。(1) When treating phosphorus-containing wastewater,
After adding calcium salt in an amount of at least three times the amount of phosphorus contained in the wastewater under conditions of pH 8 or higher to form a calcium phosphate precipitate, air-pressurized water is added to the wastewater under atmospheric pressure containing the calcium phosphate precipitate. A method for removing phosphorus from wastewater, which comprises introducing calcium phosphate and floating and separating the calcium phosphate using fine bubbles generated at that time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6081487A JPS63224792A (en) | 1987-03-16 | 1987-03-16 | Removal of phosphorus in waste water |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6081487A JPS63224792A (en) | 1987-03-16 | 1987-03-16 | Removal of phosphorus in waste water |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63224792A true JPS63224792A (en) | 1988-09-19 |
| JPH0220318B2 JPH0220318B2 (en) | 1990-05-08 |
Family
ID=13153193
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6081487A Granted JPS63224792A (en) | 1987-03-16 | 1987-03-16 | Removal of phosphorus in waste water |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63224792A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5368741A (en) * | 1993-10-12 | 1994-11-29 | Fmc Corporation | Treatment of aqueous phosphorus wastes |
| WO2003038351A1 (en) * | 2001-11-02 | 2003-05-08 | Ozone Manufacturing Pty Ltd | Refrigeration purifiers |
| JP2016031296A (en) * | 2014-07-29 | 2016-03-07 | 三菱重工業株式会社 | Waste liquid treating system and waste liquid treating method |
-
1987
- 1987-03-16 JP JP6081487A patent/JPS63224792A/en active Granted
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5368741A (en) * | 1993-10-12 | 1994-11-29 | Fmc Corporation | Treatment of aqueous phosphorus wastes |
| WO2003038351A1 (en) * | 2001-11-02 | 2003-05-08 | Ozone Manufacturing Pty Ltd | Refrigeration purifiers |
| JP2016031296A (en) * | 2014-07-29 | 2016-03-07 | 三菱重工業株式会社 | Waste liquid treating system and waste liquid treating method |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0220318B2 (en) | 1990-05-08 |
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