JPH10230275A - Treatment of phosphate ion-containing waste water - Google Patents
Treatment of phosphate ion-containing waste waterInfo
- Publication number
- JPH10230275A JPH10230275A JP9037621A JP3762197A JPH10230275A JP H10230275 A JPH10230275 A JP H10230275A JP 9037621 A JP9037621 A JP 9037621A JP 3762197 A JP3762197 A JP 3762197A JP H10230275 A JPH10230275 A JP H10230275A
- Authority
- JP
- Japan
- Prior art keywords
- waste water
- wastewater
- iron
- treated
- ions
- 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
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/463—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrocoagulation
Landscapes
- Separation Of Suspended Particles By Flocculating Agents (AREA)
- Water Treatment By Electricity Or Magnetism (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、排水、特に家庭排
水または集合住宅の排水などのリン酸イオンを含む生活
排水の処理方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for treating domestic wastewater containing phosphate ions, such as wastewater, particularly domestic wastewater or collective housing wastewater.
【０００２】[0002]
【従来の技術】川や湖の富栄養化の原因の１つにリン化
合物の存在があることは周知である。また、このリン化
合物は工場排水よりも一般家庭の生活排水中に多く存在
するため浄化処理が困難なものであり、有効な対策がと
れないのが現状である。It is well known that one of the causes of eutrophication of rivers and lakes is the presence of phosphorus compounds. Further, since this phosphorus compound is present more in household wastewater than in factory wastewater, it is difficult to purify it, and at present, effective measures cannot be taken.
【０００３】リン化合物の浄化処理方法は種々提案され
ているが、家庭排水については鉄の電解溶出法が知られ
ている（特開平３−８９９９８号公報）。この技術は、
排水中のリン酸イオンを鉄イオンと反応させ水不溶性の
塩、たとえばＦｅＰＯ4やＦｅ（ＯＨ）x（ＰＯ4）yとし
て凝集沈殿させて除去しようとする技術であり、鉄製の
電極に通電して排水中に鉄イオンを溶出させるものであ
る。Various methods for purifying phosphorus compounds have been proposed, and for domestic wastewater, an electrolytic elution method of iron is known (Japanese Patent Application Laid-Open No. 3-89998). This technology is
This is a technique in which phosphate ions in waste water are reacted with iron ions to form coagulated precipitates as water-insoluble salts, for example, FePO 4 or Fe (OH) x (PO 4 ) y. To elute iron ions in wastewater.
【０００４】[0004]
【発明が解決しようとする課題】しかし、この鉄の電解
溶出法は、リン酸イオンの除去効率がそれほど大きくな
く、したがって消費電力も大きくなる。However, in this iron elution method, the efficiency of removing phosphate ions is not so large, and the power consumption is also large.
【０００５】本発明者らは鉄（アルミニウム）の電解溶
出法によるリン酸イオンの除去効率を向上させるべくを
種々検討し研究を重ねた結果、被処理排水中にカオリン
などの凝集核剤を１ｍｇ／リットル以上存在させるとリ
ン酸イオンの除去効率が大きく向上することを見出し
た。The inventors of the present invention have conducted various studies to improve the efficiency of removing phosphate ions by the electrolytic elution method of iron (aluminum), and as a result of repeated studies, have found that 1 mg of a coagulation nucleating agent such as kaolin in wastewater to be treated. It has been found that the removal efficiency of phosphate ions is greatly improved when the amount is present in an amount of / L or more.
【０００６】[0006]
【課題を解決するための手段】すなわち本発明は、鉄イ
オンおよび／またはアルミニウムイオンを含む電極を用
いてリン酸イオンを含む排水中に鉄イオンおよび／また
はアルミニウムイオンを電気化学的に溶出させリン酸イ
オンを鉄および／またはアルミニウムとの水不溶性の塩
の形で凝集沈殿させる排水の処理方法であって、被処理
排水中に凝集核剤が１ｍｇ／リットル以上存在する状態
で行なう処理方法に関する。That is, the present invention provides a method for electrochemically eluting iron ions and / or aluminum ions into waste water containing phosphate ions using an electrode containing iron ions and / or aluminum ions. The present invention relates to a method for treating wastewater in which acid ions are coagulated and precipitated in the form of a water-insoluble salt with iron and / or aluminum, and the method is carried out in a state in which a coagulation nucleating agent is present in a wastewater to be treated in an amount of 1 mg / liter or more.
【０００７】[0007]
【発明の実施の形態】リン酸イオン含有排水の鉄（アル
ミニウム）の電解溶出法による処理は、電極から溶出し
た鉄（アルミニウム）イオンが排水中のリン酸イオンと
反応して水不溶性のリン酸と鉄（アルミニウム）との塩
を生成させる反応を利用するものである。BEST MODE FOR CARRYING OUT THE INVENTION In the treatment of iron (aluminum) in a phosphate ion-containing wastewater by the electrolytic elution method, iron (aluminum) ions eluted from the electrode react with phosphate ions in the wastewater to form a water-insoluble phosphate. And a reaction of forming a salt of iron and aluminum.
【０００８】本発明では被処理排水中に凝集核剤を存在
させることにより、鉄（アルミニウム）イオンとリン酸
イオンとの水不溶性の反応生成物を凝集させ、反応場か
ら速やかに取り除き、本来の鉄（アルミニウム）イオン
とリン酸イオンとの反応を促進させているものと考えら
れる。In the present invention, the presence of a coagulation nucleating agent in the wastewater to be treated causes the water-insoluble reaction product of iron (aluminum) ions and phosphate ions to coagulate and is promptly removed from the reaction field, thereby reducing It is considered that this promotes the reaction between iron (aluminum) ions and phosphate ions.
【０００９】凝集核剤としては、リン酸と鉄（アルミニ
ウム）との塩を凝集させる作用を持つものであればよ
く、とくに固体の微粒子が被処理廃水中に懸濁滞留させ
やすい点などから好ましい。The coagulation nucleating agent may be any as long as it has an action of coagulating a salt of phosphoric acid and iron (aluminum), and is particularly preferable because solid fine particles are easily suspended and retained in the wastewater to be treated. .
【００１０】固体としては、たとえばカオリン、ガラ
ス、シリカ、その他の鉱物類などのケイ素含有化合物の
粉末；炭酸カルシウム、酸化チタン、酸化マグネシウ
ム、酸化カルシウム、酸化アルミニウムなどの金属の炭
酸塩や酸化物の粉末；ガラス繊維、セルロース繊維、合
成繊維、炭素繊維などの繊維、カーボン粉末、多孔質合
成樹脂粉末などがあげられる。これらのうち、安価であ
る点からカオリン、シリカ、酸化アルミニウムなどの粉
末、セルロース繊維、カーボンの粉末や繊維が、また取
り扱いが容易でかつＪＩＳの標準物質として広く用いら
れている点からカオリンやシリカの粉末が好ましく使用
できる。Examples of the solid include powders of silicon-containing compounds such as kaolin, glass, silica, and other minerals; and carbonates and oxides of metals such as calcium carbonate, titanium oxide, magnesium oxide, calcium oxide, and aluminum oxide. Powder; fiber such as glass fiber, cellulose fiber, synthetic fiber, carbon fiber, carbon powder, and porous synthetic resin powder. Of these, kaolin, silica, aluminum oxide and other powders, cellulose fibers, carbon powders and fibers are inexpensive, and kaolin and silica are easy to handle and widely used as JIS standard materials. Can be preferably used.
【００１１】また本発明者らは、鉄（アルミニウム）の
電解溶出法によるリン酸イオンの除去法において、別
途、カルシウムイオンおよび／またはマグネシウムイオ
ンがある濃度（２ｍｇ／リットル以上）存在している
と、リン酸イオンの除去効率が向上することも見出して
いる。したがって、本発明において、溶解度の小さいカ
ルシウム化合物および／またはマグネシウム化合物を凝
集核剤として使用するときは、カルシウムイオンやマグ
ネシウムイオン源ともなり、さらに好ましい。そうした
カルシウム化合物およびマグネシウム化合物としては、
たとえば炭酸カルシウム（溶解度：１．４ｍｇ／水１０
０ｇ）、シュウ酸カルシウム（溶解度：０．６７ｍｇ／
水１００ｇ）、水酸化マグネシウム（溶解度：０．９ｍ
ｇ／水１００ｇ）などがあげられるが、価格および水に
溶け難い点から炭酸カルシウム、水酸化マグネシウムが
好ましい。In addition, the present inventors have found that in the method of removing phosphate ions by electrolytic elution of iron (aluminum), calcium ions and / or magnesium ions are present at a certain concentration (2 mg / liter or more). It has also been found that the efficiency of removing phosphate ions is improved. Therefore, in the present invention, when a calcium compound and / or a magnesium compound having low solubility are used as a coagulation nucleating agent, they also serve as a source of calcium ions and magnesium ions, and are more preferable. Such calcium and magnesium compounds include:
For example, calcium carbonate (solubility: 1.4 mg / water 10
0 g), calcium oxalate (solubility: 0.67 mg /
Water 100g), magnesium hydroxide (solubility: 0.9m)
g / water 100 g), but calcium carbonate and magnesium hydroxide are preferred from the viewpoints of cost and insolubility in water.
【００１２】固体状凝集核剤は、被処理液中に懸濁滞留
している状態か、比較的ゆっくりと沈降する状態で存在
している。懸濁滞留させるばあいは、粒子状であれば平
均粒径１〜１０μｍ、好ましくは１〜５μｍのものと
し、繊維状であれば繊維長１〜１０μｍ、好ましくは５
〜１０μｍのものとするのが望ましい。沈降するもの
は、前記の平均粒径または繊維長を超えるものを用いて
もよい。上限は特に限定されないが、余り大きすぎると
沈降が速くなり凝集効果が低くなるほか、回収除去の点
で問題が生じやすいため、平均粒径では約５０μｍ、繊
維長では約１００μｍである。The solid flocculating nucleating agent exists in a state of being suspended and staying in the liquid to be treated or in a state of sedimenting relatively slowly. When the suspension is retained, the average particle diameter is 1 to 10 μm, preferably 1 to 5 μm in the case of particles, and the fiber length is 1 to 10 μm, preferably 5 in the case of fibers.
It is desirable that the thickness be 10 μm to 10 μm. Those that settle out may be those that exceed the above average particle size or fiber length. The upper limit is not particularly limited, but if it is too large, sedimentation will be faster and the coagulation effect will be low, and problems will easily occur in terms of recovery and removal. Therefore, the average particle size is about 50 μm, and the fiber length is about 100 μm.
【００１３】凝集核剤の添加方法は、処理槽に流入前の
被処理排水に添加してもよいし、処理槽において添加し
てもよい。添加は連続的でも間欠的でもよい。添加する
凝集核剤の形態は粉末状でも水性懸濁液または水性スラ
リーなどの形態でもよい。The coagulation nucleating agent may be added to the wastewater to be treated before flowing into the treatment tank, or may be added in the treatment tank. The addition may be continuous or intermittent. The form of the coagulation nucleating agent to be added may be in the form of a powder, an aqueous suspension or an aqueous slurry.
【００１４】本発明は凝集核剤を被処理排水中に１ｍｇ
／リットル以上存在させた状態で鉄（アルミニウム）の
電解溶出法によりリン酸イオンを除去する方法であり、
後述する図２に示すように、凝集核剤が１ｍｇ／リット
ル以上存在すればリン酸イオンの除去効率が大きく向上
する。本発明の凝集核剤は鉄（アルミニウム）の電解溶
出法と組み合わせすることによって顕著な効果を奏する
のであり、鉄（アルミニウム）の電解溶出反応を行なわ
ない系では、凝集核剤を添加してもリン酸イオンの除去
効率は向上しない。According to the present invention, 1 mg of coagulation nucleating agent is contained in the wastewater to be treated.
Is a method of removing phosphate ions by iron (aluminum) electrolytic elution in the presence of
As shown in FIG. 2, which will be described later, when the aggregation nucleating agent is present at 1 mg / liter or more, the efficiency of removing phosphate ions is greatly improved. The coagulation nucleating agent of the present invention has a remarkable effect when combined with the electrolytic elution method of iron (aluminum). In a system in which the electrolytic elution reaction of iron (aluminum) is not performed, the coagulation nucleating agent may be added. The efficiency of removing phosphate ions is not improved.
【００１５】リン酸イオンの除去効率は凝集核剤の存在
量の増加に伴って増大するが、次第に増大率も小さくな
ってくるので（図２参照）、経済面、保守が容易である
点から、凝集核剤の存在量の上限は１００ｍｇ／リット
ル、好ましくは５０ｍｇ／リットルが望ましい。好まし
い下限は、リン酸イオンの存在量、除去後のリン酸イオ
ンの目標値、鉄の溶解量、電解槽の曝気量などによって
設定されるが、２０ｍｇ／リットル程度を標準とすれば
よい。The phosphate ion removal efficiency increases with the increase in the amount of the coagulating nucleating agent, but the rate of increase gradually decreases (see FIG. 2), so that it is economical and easy to maintain. The upper limit of the amount of the coagulation nucleating agent is 100 mg / liter, preferably 50 mg / liter. The preferred lower limit is set by the amount of phosphate ions present, the target value of phosphate ions after removal, the amount of iron dissolved, the amount of aeration in the electrolytic cell, and the like, but a standard of about 20 mg / liter may be used.
【００１６】なお、被処理排水中に凝集の核となりうる
物質がすでに存在しているばあいがあるが、そのばあ
い、不足分を補えばよい。There is a case where a substance which can be a nucleus of coagulation already exists in the wastewater to be treated. In this case, the shortage may be compensated for.
【００１７】鉄（アルミニウム）の電解溶出法には従来
公知の方法が採用でき、電極として鉄、鉄合金、アルミ
ニウム、アルミニウム合金などが用いられる。通電は連
続的でも断続的、パルス的でもよい。通電量はリン酸イ
オンや他のイオンの濃度、排水の流量などによって異な
るが、鉄イオンおよびまたはアルミニウムイオンの排水
中の濃度／リン酸イオン濃度の比（以下、「Ｆｅ／Ｐ」
と略す）が０．８〜３．０、好ましくは１．０〜２．５
となるように調節すればよい。本発明によれば、かかる
通電量を大幅に低減することができ、節電できると共に
鉄やアルミニウムの溶出量を低減できる。As the electrolytic elution method of iron (aluminum), a conventionally known method can be employed, and iron, iron alloy, aluminum, aluminum alloy or the like is used as an electrode. The energization may be continuous, intermittent, or pulsed. The amount of electricity varies depending on the concentration of phosphate ions and other ions, the flow rate of wastewater, and the like, but the ratio of the concentration of iron ions and / or aluminum ions in wastewater to the concentration of phosphate ions (hereinafter, “Fe / P”)
0.8 to 3.0, preferably 1.0 to 2.5
It may be adjusted so that According to the present invention, such an amount of electricity can be significantly reduced, power can be saved, and an elution amount of iron and aluminum can be reduced.
【００１８】凝集核剤により生じた凝集物は沈降するの
で、処理槽底部に堆積した凝集物を定期的に取り除く
か、処理槽の底部に散気管（板）を配設してバブリング
することにより凝集物に空気を抱えさせて浮き上がら
せ、オーバーフローにより連続的に取り除いてもよい。Since the agglomerates generated by the aggregating nucleating agent settle, the agglomerates deposited on the bottom of the processing tank are periodically removed, or a diffuser (plate) is provided at the bottom of the processing tank and bubbling is performed. The agglomerates may be held up by air, and may be continuously removed by overflow.
【００１９】本発明の排水の処理方法は前述のように一
般家庭排水に特に有利に利用できる。したがって、単独
で使用してもよいが、他の浄化システム、たとえば活性
汚泥法、膜分離法、嫌気・好気循環法などと組合せて家
庭用、集合住宅用の総合排水浄化システムとすることが
できる。また、大規模処理システム（し尿処理場）にも
利用できる。As described above, the method for treating wastewater of the present invention can be used particularly advantageously for general domestic wastewater. Therefore, it may be used alone, but it may be combined with other purification systems, for example, activated sludge method, membrane separation method, anaerobic / aerobic circulation method, etc., to form a comprehensive wastewater purification system for homes and apartment houses. it can. It can also be used for large-scale processing systems (human waste processing plants).
【００２０】[0020]
【実施例】つぎに本発明の方法を実施例に基づいて説明
するが、本発明はかかる実施例のみに限定されるもので
はない。EXAMPLES Next, the method of the present invention will be described based on examples, but the present invention is not limited to only these examples.
【００２１】実施例１ 図１に示す鉄の電解溶出排水処理装置を用い、供試排水
としてリン酸イオン濃度５ｍｇ／リットル（Ｈ3ＰＯ4と
して添加）、Ｎａ+２００ｍｇ／リットルを含む水を用
いて行なった。Example 1 Using an iron electrolysis elution wastewater treatment apparatus shown in FIG. 1, water containing a phosphate ion concentration of 5 mg / liter (added as H 3 PO 4 ) and Na + 200 mg / liter was used as test wastewater. I did it.
【００２２】図１において１は排水処理室であり、排水
２の流入口３および流出口４を有している。排水処理室
１内には排水２中に浸漬している高純度の鉄製の電極５
が２板配置されており、電源６に接続されている。処理
室１の底部に散気管７を配置し、曝気用ポンプ８から空
気を送気し、バブリングをした。電極への通電量はＦｅ
／Ｐが１．８となるように４６７ｍＡとし、３０分ごと
に極性を反転させた。供試排水には凝集核剤としてカオ
リン粉末（平均粒径：５μｍ）を０、１０、３０、５０
および１００ｍｇ／リットルの濃度となるように添加
し、０．５リットル／分の流量で流入させた。処理済の
排水中のリン酸イオン濃度は、通電開始から２時間後に
流出口４で採取した排水を孔径０．４５μｍのフィルタ
ーで濾過した濾液をＪＩＳ Ｋ ０１０２に規格された
全リン分析法（４６．３）に準拠して調べた。In FIG. 1, reference numeral 1 denotes a wastewater treatment chamber, which has an inlet 3 and an outlet 4 for wastewater 2. In the wastewater treatment chamber 1, a high-purity iron electrode 5 immersed in the wastewater 2
Are arranged in two plates and connected to the power supply 6. An air diffuser 7 was arranged at the bottom of the processing chamber 1, and air was supplied from an aeration pump 8 to perform bubbling. The amount of electricity to the electrode is Fe
467 mA was applied so that / P became 1.8, and the polarity was inverted every 30 minutes. Kaolin powder (average particle size: 5 μm) was used as a coagulation nucleating agent in the test wastewater at 0, 10, 30, and 50.
And a concentration of 100 mg / liter was added and flowed in at a flow rate of 0.5 liter / minute. The concentration of phosphate ions in the treated wastewater was determined by measuring the filtrate obtained by filtering the wastewater collected at the outlet 4 two hours after the start of energization with a filter having a pore diameter of 0.45 μm and analyzing the total phosphorus analysis method specified in JIS K 0102 (46). .3).
【００２３】結果を図２に示す。FIG. 2 shows the results.
【００２４】図２から、凝集核剤を添加することにより
リン酸イオンの除去率が急激に上昇していることがわか
る。FIG. 2 shows that the addition of the coagulation nucleating agent sharply increases the phosphate ion removal rate.
【００２５】実施例２ 実施例１において、カオリンに代えて炭酸カルシウム
（平均粒径：１０μｍ）を供試排水に濃度０、１０、３
０、５０および１００ｍｇ／リットルとなるように加え
たほかは同様にして排水の処理を行ない、処理済の排水
中のリン酸イオンの濃度を実施例１と同様にして測定し
た。Example 2 In Example 1, calcium carbonate (average particle size: 10 μm) was used instead of kaolin in the test wastewater at a concentration of 0, 10, 3 or less.
The wastewater was treated in the same manner except that it was added at 0, 50 and 100 mg / liter, and the concentration of phosphate ions in the treated wastewater was measured in the same manner as in Example 1.
【００２６】結果を図３に示す。FIG. 3 shows the results.
【００２７】図３から明らかなように、カルシウムイオ
ン源でもある炭酸カルシウムを存在させるとリン酸イオ
ンの除去率がさらに向上する。As apparent from FIG. 3, the presence of calcium carbonate, which is also a calcium ion source, further improves the phosphate ion removal rate.
【００２８】[0028]
【発明の効果】本発明の方法によれば、排水中のリン酸
イオンを高率で除去でき、しかも電極である鉄またはア
ルミニウムの消費量および溶出のための電力を低減で
き、排水処理装置を長期間連続して低電力で運転でき
る。According to the method of the present invention, phosphate ions in wastewater can be removed at a high rate, and the consumption of iron or aluminum as an electrode and the power for elution can be reduced. It can be operated continuously with low power for a long time
【図１】本発明の方法を実施するための排水処理装置の
一実施態様の概略説明図である。FIG. 1 is a schematic explanatory view of one embodiment of a wastewater treatment apparatus for performing a method of the present invention.
【図２】本発明の実施例１における鉄電極を用いたばあ
いのカオリン濃度とリン酸イオン除去率の関係を示すグ
ラフである。FIG. 2 is a graph showing a relationship between a kaolin concentration and a phosphate ion removal rate when an iron electrode is used in Example 1 of the present invention.
【図３】本発明の実施例２における鉄電極を用いたばあ
いの炭酸カルシウム濃度とリン酸イオン除去率の関係を
示すグラフである。FIG. 3 is a graph showing a relationship between a calcium carbonate concentration and a phosphate ion removal rate when an iron electrode is used in Example 2 of the present invention.
１ 排水処理室 ２ 排水 ３ 流入口 ４ 流出口 ５ 電極 ６ 電源 ７ 散気管 ８ 曝気用ポンプ DESCRIPTION OF SYMBOLS 1 Wastewater treatment room 2 Drainage 3 Inflow port 4 Outflow port 5 Electrode 6 Power supply 7 Diffusion pipe 8 Aeration pump
───────────────────────────────────────────────────── フロントページの続き (72)発明者 福本 明広 大阪府守口市京阪本通２丁目５番５号 三 洋電機株式会社内 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Akihiro Fukumoto 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd.
Claims (1)
オンを含む電極を用いてリン酸イオンを含む排水中に鉄
イオンおよび／またはアルミニウムイオンを電気化学的
に溶出させリン酸イオンを鉄および／またはアルミニウ
ムとの水不溶性塩の形で凝集沈殿させる排水の処理方法
であって、被処理排水中に凝集核剤が１ｍｇ／リットル
以上存在する状態で行なう処理方法。An iron ion and / or aluminum ion is electrochemically eluted into waste water containing phosphate ions by using an electrode containing iron ions and / or aluminum ions, so that the phosphate ions are converted to iron and / or aluminum. A method for treating wastewater which is subjected to coagulation and sedimentation in the form of a water-insoluble salt, wherein the coagulation nucleating agent is present in the wastewater to be treated in an amount of 1 mg / liter or more.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9037621A JPH10230275A (en) | 1997-02-21 | 1997-02-21 | Treatment of phosphate ion-containing waste water |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9037621A JPH10230275A (en) | 1997-02-21 | 1997-02-21 | Treatment of phosphate ion-containing waste water |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH10230275A true JPH10230275A (en) | 1998-09-02 |
Family
ID=12502713
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9037621A Pending JPH10230275A (en) | 1997-02-21 | 1997-02-21 | Treatment of phosphate ion-containing waste water |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH10230275A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005199248A (en) * | 2004-01-15 | 2005-07-28 | Nippon Solid Co Ltd | Raw water treatment process |
| WO2018216815A1 (en) * | 2017-05-26 | 2018-11-29 | ナノミストテクノロジーズ株式会社 | Ship diesel engine exhaust gas treatment method and treatment device |
| JP2021137752A (en) * | 2020-03-06 | 2021-09-16 | 太平洋セメント株式会社 | Waste liquid disposal method |
| US11951420B2 (en) | 2016-05-16 | 2024-04-09 | Evolution Aqua Limited | Filter apparatus and method |
| WO2024110480A1 (en) * | 2022-11-21 | 2024-05-30 | Evolution Aqua Limited | Wastewater treatment method and apparatus |
-
1997
- 1997-02-21 JP JP9037621A patent/JPH10230275A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005199248A (en) * | 2004-01-15 | 2005-07-28 | Nippon Solid Co Ltd | Raw water treatment process |
| US11951420B2 (en) | 2016-05-16 | 2024-04-09 | Evolution Aqua Limited | Filter apparatus and method |
| WO2018216815A1 (en) * | 2017-05-26 | 2018-11-29 | ナノミストテクノロジーズ株式会社 | Ship diesel engine exhaust gas treatment method and treatment device |
| JP2021137752A (en) * | 2020-03-06 | 2021-09-16 | 太平洋セメント株式会社 | Waste liquid disposal method |
| WO2024110480A1 (en) * | 2022-11-21 | 2024-05-30 | Evolution Aqua Limited | Wastewater treatment method and apparatus |
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