JPH0749116B2 - Phosphorus-containing wastewater treatment method - Google Patents
Phosphorus-containing wastewater treatment methodInfo
- Publication number
- JPH0749116B2 JPH0749116B2 JP7215487A JP7215487A JPH0749116B2 JP H0749116 B2 JPH0749116 B2 JP H0749116B2 JP 7215487 A JP7215487 A JP 7215487A JP 7215487 A JP7215487 A JP 7215487A JP H0749116 B2 JPH0749116 B2 JP H0749116B2
- Authority
- JP
- Japan
- Prior art keywords
- aqueous solution
- adsorption tower
- alkaline aqueous
- phosphoric acid
- ion adsorbent
- 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
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Landscapes
- Water Treatment By Sorption (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
- Activated Sludge Processes (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、し尿等のリン含有廃水を活性汚泥により好気
性生物処理し、その生物処理後の処理水から活性汚泥及
びリン酸を除去するリン含有廃水処理方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention performs aerobic biological treatment of phosphorus-containing wastewater such as human waste with activated sludge, and removes activated sludge and phosphoric acid from the treated water after the biological treatment. The present invention relates to a method for treating phosphorus-containing wastewater.
従来、第２図に示すように、曝気槽（２）で活性汚泥に
よる好気性生物処理を原水供給路（１）からの原水に対
して施し、その生物処理後の処理水に凝集混和槽（18）
でタンク（19a），（19b）からの硫酸バンドと苛性ソー
ダを加え、凝集混和槽（18）からの処理水を沈澱池（2
0）で処理して、活性汚泥を凝集沈澱させると共にリン
酸を凝集汚泥で吸着除去していた。Conventionally, as shown in FIG. 2, raw water from the raw water supply channel (1) has been subjected to aerobic biological treatment with activated sludge in an aeration tank (2), and the treated water after the biological treatment has an aggregating and mixing tank ( 18)
At this point, the sulfuric acid bands from tanks (19a) and (19b) and caustic soda were added, and the treated water from the coagulation and mixing tank (18) was added to the settling basin (2
The activated sludge was coagulated and precipitated, and phosphoric acid was adsorbed and removed by the coagulated sludge.
しかし、活性汚泥リン酸を凝集沈澱法で十分に除去する
ためには、大量の硫酸バンドと苛性ソーダを必要し、例
えばし尿1m3を処理するに硫酸バンドをAl2O3換算で0.6
〜0.8kgをかつ苛性ソーダを1.2〜1.8kgを必要とし、薬
品に多大の経費が掛かり、ランニングコスト面で欠点が
があった。However, in order to sufficiently remove the activated sludge phosphoric acid by the coagulation sedimentation method, a large amount of sulfuric acid band and caustic soda are required.For example, when treating 1 m 3 of human waste, the sulfuric acid band is converted to Al 2 O 3 by 0.6%.
It required ~ 0.8kg and 1.2 ~ 1.8kg of caustic soda, which required a large amount of chemicals and had a drawback in terms of running cost.
本発明の目的は、生物処理後の処理水からの活性汚泥及
びリン酸除去を十分に行えながら、ランニングコストを
十分に少なくできるようにする点にある。An object of the present invention is to enable running costs to be sufficiently reduced while sufficiently removing activated sludge and phosphoric acid from treated water after biological treatment.
本発明の特徴手段は、生物処理後の処理水からの活性汚
泥除去を限外濾過器で行い、その限外濾過器からの濾過
水を吸着塔でリン酸イオン吸着剤に接触させて、濾過水
中のリン酸を除去し、前記吸着塔から処理済水を回収
し、前記吸着塔でのリン酸除去機能が劣化した時、その
吸着塔への濾過水供給を停止した状態で、アルカリ水溶
液を前記吸着塔に供給して、前記リン酸イオン吸着剤か
らリン酸を前記アルカリ水溶液で脱着し、前記吸着塔か
ら回収したアリカリ水溶液に石灰を加えてリン酸カルシ
ウムを生成させ、その後、アルカリ水溶液からリン酸カ
ルシウムを固液分離装置で除去し、その固液分離装置か
ら回収したアルカリ水溶液を前記リン酸イオン吸着剤の
再生に再使用することにあり、その作用効果は次の通り
である。The characteristic means of the present invention is to remove activated sludge from the treated water after biological treatment with an ultrafilter, and the filtered water from the ultrafilter is brought into contact with a phosphate ion adsorbent in an adsorption tower for filtration. Phosphoric acid in water is removed, treated water is recovered from the adsorption tower, and when the phosphoric acid removal function in the adsorption tower is deteriorated, an alkaline aqueous solution is added in a state where the filtered water supply to the adsorption tower is stopped. Supplying to the adsorption tower, desorbing phosphoric acid from the phosphate ion adsorbent with the alkaline aqueous solution, adding lime to the aqueous solution of Alikari recovered from the adsorption tower to generate calcium phosphate, then calcium phosphate from the alkaline aqueous solution. The alkaline aqueous solution removed by the solid-liquid separation device and recovered from the solid-liquid separation device is reused for the regeneration of the phosphate ion adsorbent, and its action and effect are as follows.
つまり、限界濾過器で生物膜やセラミックフィルターな
どで濾過すれば、活性汚泥を凝集剤添加で予め凝集処理
しなくても、活性汚泥をほとんど完全に除去した濾過水
が得られ、凝集剤に要する経費を零にできる。In other words, if filtration is performed using a biofilter or a ceramic filter with a limit filter, filtered water from which the activated sludge is almost completely removed can be obtained without the coagulation treatment of the activated sludge in advance, which is required for the coagulant. The cost can be reduced to zero.
他方、限外濾過器ではリン酸を除去できないが、吸着塔
において濾過水中のリン酸をリン酸イオン吸着剤により
ほとんど完全に吸着除去でき、活性汚泥及びリン酸の除
去を確実に行える。On the other hand, although the phosphoric acid cannot be removed by the ultrafilter, the phosphoric acid in the filtered water can be almost completely adsorbed and removed by the phosphate ion adsorbent in the adsorption tower, and the activated sludge and phosphoric acid can be surely removed.
リン酸イオン吸着剤はリン酸吸着に伴って吸着性能が劣
化するが、アルカリ水溶液でリン酸イオン吸着剤からリ
ン酸を脱着して、再生されたリン酸イオン吸着剤を再使
用するから、高価なリン酸イオン吸着剤の消耗が無く、
このことによっても経費節減を図れる。Although the adsorption performance of phosphate ion adsorbent deteriorates with phosphoric acid adsorption, it is expensive because the phosphate ion adsorbent is desorbed from the phosphate ion adsorbent in an alkaline aqueous solution and the regenerated phosphate ion adsorbent is reused. There is no consumption of various phosphate ion adsorbents,
This also saves money.
また、リン酸イオン吸着剤の再生に使用したアルカリ水
溶液に石灰を加えて、アルカリ水溶液中のリン酸を沈澱
物のリン酸カルシウムにし、固液分離でリン酸カルシウ
ムを除去したアルカリ水溶液をリン酸イオン吸着剤の再
生に再使用するから、高価なアルカリ水溶液の消耗が無
く、アルカリ水溶液に比してはるかに安価な石灰を消費
するだけで済み、このことによっても経費節減を図れ
る。Also, lime was added to the alkaline aqueous solution used to regenerate the phosphate ion adsorbent to convert the phosphoric acid in the alkaline aqueous solution into calcium phosphate in the precipitate, and the alkaline aqueous solution from which calcium phosphate had been removed by solid-liquid separation was used as the phosphate ion adsorbent. Since it is reused for regeneration, the expensive alkaline aqueous solution is not consumed, and lime, which is much cheaper than the alkaline aqueous solution, is consumed, which also contributes to cost reduction.
その結果、高価な硫酸バンドや苛性ソーダを大量に消費
していた前述の従来技術に比して、安価な石灰を消費す
るだけの極めてランニングコストの低い状態で、十分な
活性汚泥とリン酸の除去を行えるようになった。As a result, compared to the above-mentioned conventional technology that consumed a large amount of expensive sulfuric acid band and caustic soda, sufficient activated sludge and phosphoric acid removal can be performed at a very low running cost that consumes inexpensive lime. You can now do.
次に、第１図により実施例を示す。 Next, FIG. 1 shows an embodiment.
し尿等の有機分やリン等を多量に含む廃水を、原水供給
路（１）から曝気槽（２）に供給して、曝気槽（２）で
活性汚泥により好気性生物処理し、BODを十分に減少さ
せる。Waste water containing a large amount of organic matter such as human waste and phosphorus is supplied from the raw water supply channel (1) to the aeration tank (2), and the aeration tank (2) performs aerobic biological treatment with activated sludge to obtain a sufficient BOD. Reduce to.
税物処理後の処理水をポンプ（Ｐ）付流路（３）で限外
濾過器（４）に加圧供給し、限外濾過膜（4a）の作用で
活性汚泥が除去された濾過水を得て、高濃度の活性汚泥
を含む処理水を還流路（５）で曝器槽（２）に戻す。Filtered water from which activated sludge has been removed by the action of the ultrafiltration membrane (4a) by supplying the treated water after tax treatment to the ultrafilter (4) under pressure through the flow path (3) with a pump (P). Then, the treated water containing a high concentration of activated sludge is returned to the exposure tank (2) through the reflux passage (5).
濾過水をポンプ（Ｐ）付流路（６）で吸着塔（７）に供
給し、吸着塔（７）において濾過水を、酸化ジルコニウ
ム水和物を塩酸酸性溶液でイオン化したリン酸イオン吸
着剤に接触させて、濾過水中のリン酸を吸着除去し、吸
着塔（７）からの処理済水を回収路（８）に送る。尚、
酸化ジルコニウムの粒度は10〜50メッシュで吸着塔
（７）での充填密度は0.4〜0.5g/mlである。The filtered water is supplied to the adsorption tower (7) through the flow path (6) with the pump (P), and the filtered water in the adsorption tower (7) is a phosphate ion adsorbent obtained by ionizing zirconium oxide hydrate with a hydrochloric acid acidic solution. To remove the phosphoric acid in the filtered water by adsorption, and send the treated water from the adsorption tower (7) to the recovery passageway (8). still,
The particle size of zirconium oxide is 10 to 50 mesh, and the packing density in the adsorption tower (7) is 0.4 to 0.5 g / ml.
そして、吸着塔（７）でのリン酸除去機能が劣化した
時、流路（６）の弁（V1）を閉じて吸着塔（７）への濾
過水供給を停止し、吸着塔（７）内の濾過水を全量排出
した後、回収路（８）の弁（V2）を閉じ、１％程度の水
酸化ナトリウム水溶液をタンク（９）から吸着塔（７）
にポンプ（Ｐ）付流路（10）で弁（V3）を開いて供給
し、リン酸イオン吸着剤からリン酸を水酸化ナトリウム
水溶液で脱着し、また、吸着塔（７）から混合反応槽
（11）に流路（12）の弁（V4）を開いて脱着処理後の水
酸化ナトリウム水溶液を供給する。Then, when the function of removing phosphoric acid in the adsorption tower (7) deteriorates, the valve (V 1 ) of the flow path (6) is closed to stop the supply of filtered water to the adsorption tower (7), ), The valve (V 2 ) of the recovery passageway (8) is closed, and an aqueous sodium hydroxide solution of about 1% is adsorbed from the tank (9) to the adsorption tower (7).
The valve (V 3 ) is opened by the flow path (10) with a pump (P) to supply it to the phosphate ion adsorbent to desorb phosphoric acid with an aqueous solution of sodium hydroxide, and the adsorption tower (7) conducts a mixed reaction. The valve (V 4 ) of the flow path (12) is opened in the tank (11) to supply the desorbed sodium hydroxide aqueous solution.
リン酸イオン吸着剤の再生が完了すれば、弁（V3）を閉
じて吸着塔（７）への水酸化ナトリウム水溶液の供給を
停止し、吸着塔（７）内の水酸化ナトリウム水溶液を全
量排出した後、弁（V4）を閉じると共に弁（V1），
（V2）を開いて、濾過水からのリン酸除去を再開する。When the regeneration of the phosphate ion adsorbent is completed, the valve (V 3 ) is closed to stop the supply of the sodium hydroxide aqueous solution to the adsorption tower (7), and the total amount of the sodium hydroxide aqueous solution in the adsorption tower (7) is removed. After discharging, the valve (V 4 ) is closed and the valve (V 1 ) is
Open (V 2 ) to resume phosphoric acid removal from filtered water.
他方、石灰スラリーをタンク（13）から混合反応槽（1
1）にポンプ（Ｐ）付流路（14）で供給し、混合反応槽
（11）において沈澱物であるリン酸カルシウムを生成さ
せる。この時、石灰スラリーの供給量は、水酸化ナトリ
ウム水溶液の量やリン酸濃度、石灰スラリーの濃度に見
合って、リン酸のほぼ全量がリン酸カルシウムになるよ
うに、かつ、カルシウムの余剰が極力少なくなるよう
に、適当に選定する。On the other hand, the lime slurry is mixed from the tank (13) to the reaction tank (1
It is supplied to 1) through a flow path (14) with a pump (P) to generate calcium phosphate as a precipitate in the mixing reaction tank (11). At this time, the supply amount of the lime slurry is adjusted so that almost all of the phosphoric acid becomes calcium phosphate and the surplus amount of calcium is reduced as much as possible in accordance with the amount of the sodium hydroxide aqueous solution, the phosphoric acid concentration, and the concentration of the lime slurry. As appropriate.
リン酸カルシウムの生成が完了すれば、混合反応槽（1
1）から濾過器（15）にリン酸カルシウム含有の水酸化
ナトリウム水溶液をポンプ（Ｐ）付流路（16）で供給
し、フィルター（15a）の作用でリン酸カルシウムが除
去された水酸化ナトリウム水溶液を、タンク（９）に流
路（17）で戻してリン酸イオン吸着剤の再生に再使用す
る。Once the calcium phosphate production is complete, the mixing reactor (1
A sodium hydroxide aqueous solution containing calcium phosphate is supplied from 1) to the filter (15) through the flow path (16) with a pump (P), and the sodium hydroxide aqueous solution from which calcium phosphate has been removed by the action of the filter (15a) is stored in a tank. It is returned to (9) through the flow path (17) and reused for regeneration of the phosphate ion adsorbent.
濾過器（15）で得られたリン酸カルシウムのケーキを、
曝気槽（２）から引抜かれた余剰汚泥の脱水ケーキと共
に焼却処分したり、そのまま農地還元する等の適当な手
段で処理する。The calcium phosphate cake obtained in the filter (15)
It is treated by an appropriate means such as incineration together with the dehydrated cake of excess sludge drawn from the aeration tank (2) or returning it to farmland as it is.
上記処理方法によってリン含有量が148mg/の原水を処
理した結果、回収路（８）からの処理済水のリン含有量
は0.1mg/以下であり、また、BODは処理済水から検出
できなかった。As a result of treating the raw water with a phosphorus content of 148 mg / by the above treatment method, the phosphorus content of the treated water from the recovery channel (8) is 0.1 mg / or less, and BOD cannot be detected from the treated water. It was
また、混合反応槽（11）において、リン酸イオンを600m
g/含有する水酸化ナトリウム水溶液に、石灰スラリー
を水酸化カルシウム換算で6g/を加えて、60分間撹拌
混合した結果、濾過器（15）から回収した水酸化ナトリ
ウム水溶液は、リン酸イオン濃度が0.1mg/以下であ
り、カルシウムイオン濃度が0.4mg/以下であった。In addition, in the mixing reaction tank (11), phosphate ions of 600 m
To the sodium hydroxide aqueous solution containing g /, 6 g / in terms of calcium hydroxide was added, and the mixture was stirred and mixed for 60 minutes. As a result, the sodium hydroxide aqueous solution recovered from the filter (15) had a phosphate ion concentration of The concentration was 0.1 mg / or less, and the calcium ion concentration was 0.4 mg / or less.
次に別実施例を説明する。 Next, another embodiment will be described.
リン含有廃水の種類は不問であり、また、リン含有廃水
の汚染特性に応じて、曝気槽（２）に嫌気性脱窒槽や醗
酵槽などを組合わせてもよく、要するに、リン含有廃水
を活性汚泥により好気性生物処理すればよい。The type of phosphorus-containing wastewater is irrelevant, and the aeration tank (2) may be combined with an anaerobic denitrification tank or a fermentation tank depending on the pollution characteristics of the phosphorus-containing wastewater. Aerobic biological treatment with sludge is sufficient.
限外濾過気（４）、吸着塔（７）の具体構成は適当に変
更でき、また、複数の吸着塔（７）を限外濾過器（４）
に並列接続して、いずれかの吸着塔（７）でリン酸イオ
ン吸着剤を再生しながら、他の吸着塔（７）で濾過水処
理を行い、濾過水処理を連続して行ってもよい。The specific configurations of the ultrafiltration air (4) and the adsorption tower (7) can be changed appropriately, and the plurality of adsorption towers (7) can be replaced by an ultrafilter (4).
It may be connected in parallel with each other, and while the phosphate ion adsorbent is being regenerated in one of the adsorption towers (7), the filtered water treatment is performed in the other adsorption tower (7), and the filtered water treatment may be continuously performed. .
リン酸イオン吸着剤として酸化チタン水和物、イオン吸
着剤等の適当なものを選択できる。As the phosphate ion adsorbent, suitable ones such as titanium oxide hydrate and ion adsorbent can be selected.
水酸化ナトリウム水溶液の他、適当なアルカリ水溶液を
選択使用できる。In addition to the sodium hydroxide aqueous solution, an appropriate alkaline aqueous solution can be selectively used.
濾過器（15）に代えて遠心分離機、限外濾過器、その他
適当なリン酸カルシウム除去手段を利用でき、それらを
固液分離装置（15）と総称する。A centrifuge, an ultrafilter, or other suitable calcium phosphate removing means can be used in place of the filter (15), and they are collectively referred to as a solid-liquid separator (15).
本発明方法に使用する設備全体の具体構成は適当に変更
できる。The specific configuration of the entire equipment used in the method of the present invention can be appropriately changed.
第１図は本発明の実施例を示すフローシートであり、第
２図は従来のフローシートである。 （４）……限外濾過器、（７）……吸着塔、（15）……
固液分離装置。FIG. 1 is a flow sheet showing an embodiment of the present invention, and FIG. 2 is a conventional flow sheet. (4) …… Ultrafilter, (7) …… Adsorption tower, (15) ……
Solid-liquid separator.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｃ０２Ｆ 9/00 Ｈ 7446−4Ｄ ５０３ Ｃ 7446−4Ｄ ５０４ Ａ 7446−4Ｄ (56)参考文献 特開 昭61−134061（ＪＰ，Ａ) 特開 昭61−134062（ＪＰ，Ａ) 特開 昭63−175687（ＪＰ，Ａ) 特開 昭59−123597（ＪＰ，Ａ)─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification number Internal reference number FI Technical display location C02F 9/00 H 7446-4D 503 C 7446-4D 504 A 7446-4D (56) References JP-A-61-134061 (JP, A) JP-A-61-134062 (JP, A) JP-A-63-175687 (JP, A) JP-A-59-123597 (JP, A)
Claims (2)
処理し、その生物処理後の処理水から活性汚泥及びリン
酸を除去するリン含有廃水処理方法であって、前記生物
処理後の処理水からの活性汚泥除去を限外濾過器（４）
で行い、その限外濾過器（４）からの濾過水を吸着塔
（７）でリン酸イオン吸着剤に接触させて、濾過水中の
リン酸を除去し、前記吸着塔（７）から処理済水を回収
し、前記吸着塔（７）でのリン酸除去機能が劣化した
時、その吸着塔（７）への濾過水供給を停止した状態
で、アルカリ水溶液を前記吸着塔（７）に供給して、前
記リン酸イオン吸着剤からリン酸を前記アルカリ水溶液
で脱着し、前記吸着塔（７）から回収したアリカリ水溶
液に石灰を加えてリン酸カルシウムを生成させ、その
後、アルカリ水溶液からリン酸カルシウムを固液分離装
置（15）で除去し、その固液分離装置（15）から回収し
たアルカリ水溶液を前記リン酸イオン吸着剤の再生に再
使用するリン含有廃水処理方法。1. A method for treating phosphorus-containing wastewater, which comprises subjecting phosphorus-containing wastewater to aerobic biological treatment with activated sludge and removing activated sludge and phosphoric acid from the treated water after the biological treatment. Removal of activated sludge from the ultrafilter (4)
The filtered water from the ultrafilter (4) is brought into contact with the phosphate ion adsorbent in the adsorption tower (7) to remove the phosphoric acid in the filtered water and treated from the adsorption tower (7). When water is recovered and the function of removing phosphoric acid in the adsorption tower (7) is deteriorated, an alkaline aqueous solution is supplied to the adsorption tower (7) while the supply of filtered water to the adsorption tower (7) is stopped. Then, the phosphoric acid is desorbed from the phosphate ion adsorbent with the alkaline aqueous solution, lime is added to the alkaline aqueous solution recovered from the adsorption tower (7) to generate calcium phosphate, and thereafter, the calcium phosphate is solid-liquid solubilized from the alkaline aqueous solution. A method for treating phosphorus-containing wastewater, wherein an alkaline aqueous solution removed by a separator (15) and recovered from the solid-liquid separator (15) is reused for regeneration of the phosphate ion adsorbent.
コニウム水和物を塩酸酸性溶液でイオン化したものを使
用し、前記アルカリ水溶液として水酸化ナトリウム水溶
液を使用する特許請求の範囲第１項に記載のリン含有廃
水処理方法。2. The method according to claim 1, wherein zirconium oxide hydrate ionized with a hydrochloric acid acidic solution is used as the phosphate ion adsorbent, and sodium hydroxide aqueous solution is used as the alkaline aqueous solution. Method for treating phosphorus-containing wastewater.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7215487A JPH0749116B2 (en) | 1987-03-25 | 1987-03-25 | Phosphorus-containing wastewater treatment method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7215487A JPH0749116B2 (en) | 1987-03-25 | 1987-03-25 | Phosphorus-containing wastewater treatment method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63236588A JPS63236588A (en) | 1988-10-03 |
| JPH0749116B2 true JPH0749116B2 (en) | 1995-05-31 |
Family
ID=13481056
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7215487A Expired - Lifetime JPH0749116B2 (en) | 1987-03-25 | 1987-03-25 | Phosphorus-containing wastewater treatment method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0749116B2 (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001005715A1 (en) | 1999-07-20 | 2001-01-25 | Zenon Environmental Inc. | Biological process for removing phosphorus involving a membrane filter |
| US6485645B1 (en) | 1999-07-20 | 2002-11-26 | Zenon Environmental Inc | Biological process for removing phosphorus involving a membrane filter |
| JP4647814B2 (en) * | 2001-03-27 | 2011-03-09 | 住友重機械エンバイロメント株式会社 | Organic wastewater treatment equipment |
| US7967984B2 (en) | 2005-06-14 | 2011-06-28 | Asahi Kasei Chemicals Corporation | Apparatus for water treatment and method of treating water |
| JP4703737B2 (en) * | 2009-03-13 | 2011-06-15 | 株式会社東芝 | Water treatment equipment |
| JP5518372B2 (en) * | 2009-05-29 | 2014-06-11 | 株式会社東芝 | Water treatment equipment |
| JP5443059B2 (en) * | 2009-05-29 | 2014-03-19 | 株式会社東芝 | Water treatment equipment |
| JP2015211941A (en) * | 2014-05-02 | 2015-11-26 | 旭化成ケミカルズ株式会社 | Phosphorous recovery system and phosphorous recovery method |
-
1987
- 1987-03-25 JP JP7215487A patent/JPH0749116B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63236588A (en) | 1988-10-03 |
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