JP3526140B2 - Biological phosphorus removal method and apparatus for organic wastewater - Google Patents
Biological phosphorus removal method and apparatus for organic wastewaterInfo
- Publication number
- JP3526140B2 JP3526140B2 JP17510296A JP17510296A JP3526140B2 JP 3526140 B2 JP3526140 B2 JP 3526140B2 JP 17510296 A JP17510296 A JP 17510296A JP 17510296 A JP17510296 A JP 17510296A JP 3526140 B2 JP3526140 B2 JP 3526140B2
- Authority
- JP
- Japan
- Prior art keywords
- sludge
- biological dephosphorization
- biological
- dephosphorization
- anaerobic
- 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 - Fee Related
Links
Landscapes
- Removal Of Specific Substances (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
- Treatment Of Sludge (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は下水などのリン含有
汚水を高度に浄化する技術に関し、特に余剰汚泥発生量
をゼロにでき、かつリンを高度に除去し、かつリンを資
源回収できる新規技術に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technology for highly purifying phosphorus-containing wastewater such as sewage, and in particular, a new technology capable of reducing the amount of excess sludge generated to zero, highly removing phosphorus, and recovering phosphorus resources. Regarding
【０００２】[0002]
【従来の技術】下水などの有機性汚水のリンを除去する
技術として最も代表的な技術は嫌気・好気式生物学的脱
リン法である。この技術は有機性汚水を、後段の固液分
離工程からの返送汚泥と共に嫌気槽に供給して、返送汚
泥中の活性汚泥（脱リン菌が共存している）からリン成
分（主にリン酸イオン）を吐き出させる。その後、有機
性汚水およびリン成分を吐き出した活性汚泥の混合物を
好気槽（曝気槽）に流入させて、脱リン菌により該混合
物に溶存するリン成分の摂取とＢＯＤの除去を行なわせ
た後、その活性汚泥を固液分離し、固液分離汚泥を再
度、該嫌気槽にリサイクルするものである。2. Description of the Related Art The most representative technique for removing phosphorus from organic wastewater such as sewage is an anaerobic / aerobic biological dephosphorization method. This technology supplies organic sewage to the anaerobic tank together with the return sludge from the solid-liquid separation process in the latter stage, and the phosphorus component (mainly phosphoric acid) from the activated sludge (where the dephosphorization bacteria coexist) in the return sludge. Ion) is exhaled. After that, a mixture of the organic sewage and the activated sludge in which the phosphorus component was discharged was made to flow into the aerobic tank (aeration tank), and the phosphorus component dissolved in the mixture was ingested and the BOD was removed by dephosphorization bacteria. The activated sludge is subjected to solid-liquid separation, and the solid-liquid separated sludge is recycled again to the anaerobic tank.
【０００３】しかし従来の生物学的脱リン法は次の欠点
があった。すなわち、リンは活性汚泥に取り込まれる以
外の形では除去されないので、リンを取り込んだ汚泥を
余剰汚泥として積極的に系外に排出しない限り、リンの
物質収支が成立せず高度のリン除去率が得られない。従
って余剰汚泥発生量を減少させる何らかの処置を取る
と、必然的に処理水のリン濃度が高くなってしまう。こ
のため従来の生物学的脱リン法は原理的に余剰汚泥発生
量を減少させることは不可能であると認識されており、
汚泥処理が大きな負担になってもやむを得ないと考えら
れていた。However, the conventional biological dephosphorization method has the following drawbacks. In other words, phosphorus is not removed except by being incorporated into activated sludge, so unless the sludge incorporating phosphorus is actively discharged as excess sludge out of the system, the mass balance of phosphorus will not be established and the high phosphorus removal rate will not be achieved. I can't get it. Therefore, if some measures are taken to reduce the amount of excess sludge generated, the phosphorus concentration of the treated water will inevitably increase. Therefore, it is recognized that the conventional biological dephosphorization method cannot reduce the amount of excess sludge in principle,
It was considered unavoidable that sludge treatment would be a heavy burden.
【０００４】[0004]
【発明が解決しようとする課題】本発明は嫌気・好気式
生物学的脱リン法の余剰汚泥発生量をゼロにでき、かつ
リン除去率が悪化しないという、従来技術では到達し得
なかった要求を満足でき、さらに汚水中のリン成分を肥
料などの資源として回収可能な新システムを提供するこ
とを課題とする。SUMMARY OF THE INVENTION The present invention, which can achieve zero amount of excess sludge generated by the anaerobic / aerobic biological dephosphorization method and does not deteriorate the phosphorus removal rate, cannot be achieved by the prior art. It is an object of the present invention to provide a new system that can meet the requirements and can recover phosphorus components in wastewater as resources such as fertilizer.
【０００５】[0005]
【課題を解決するための手段】本発明者は、生物学的脱
リン法のプロセス構成を変革して、生物学的なリンの摂
取、化学的リン除去、オゾンによる汚泥の酸化を新規な
態様で結合することにより上記課題を達成できることを
見いだした。すなわち本発明は、（１）有機性汚水を嫌
気・好気式生物学的脱リン法により生物学的に浄化する
方法において、該生物学的脱リン工程から活性汚泥の一
部を引き抜いて該生物学的脱リン工程とは独立した嫌気
的条件で滞留させ該活性汚泥からリン成分を液側に吐き
出させながらまたは吐き出させたのち固液分離し、液側
に吐き出されたリン成分を化学的に除去し、これとは別
に該生物学的脱リン工程から引き抜いた活性汚泥の他の
一部をオゾン処理し、該生物学的脱リン工程とは独立し
た嫌気的条件でリン成分を吐き出した後の前記固液分離
汚泥およびオゾン処理した汚泥を該生物学的脱リン工程
に供給することを特徴とする有機性汚水の生物学的脱リ
ン方法、Means for Solving the Problems The present inventor has changed the process constitution of the biological dephosphorization method to introduce biological phosphorus uptake, chemical phosphorus removal, and oxidation of sludge by ozone as novel modes. It was found that the above problems can be achieved by combining with. That is, the present invention relates to (1) a method for biologically purifying organic wastewater by an anaerobic / aerobic biological dephosphorization method, in which a part of the activated sludge is extracted from the biological dephosphorization step. The activated sludge is retained under anaerobic conditions independent of the biological dephosphorization step, and the phosphorus component is discharged from the activated sludge to the liquid side or while being discharged, and solid-liquid separation is performed, and the phosphorus component discharged to the liquid side is chemically removed. The other part of the activated sludge extracted from the biological dephosphorization step was treated with ozone, and the phosphorus component was discharged under anaerobic conditions independent of the biological dephosphorization step. A method for biologically dephosphorizing organic wastewater, characterized in that the solid-liquid separation sludge and ozone-treated sludge afterwards are supplied to the biological dephosphorization step,
【０００６】（２）オゾン処理した汚泥を生物学的脱リ
ン工程の嫌気部に供給することを特徴とする前記（１）
の有機性汚水の生物学的脱リン方法、
（３）嫌気・好気式生物学的脱リン手段を有し有機性汚
水を生物学的に浄化する装置において、該生物学的脱リ
ン手段から引き抜いた活性汚泥の一部を滞留させリン成
分を液側に吐き出させながらまたは吐き出させたのち固
液分離する該生物学的脱リン手段とは独立した嫌気部
と、液側に吐き出されたリン成分を除去する化学的リン
除去手段と、該生物学的脱リン手段から引き抜いた活性
汚泥の他の一部をオゾン処理するオゾン処理手段と、該
生物学的脱リン手段とは独立した嫌気部の固液分離で得
られた分離汚泥を該生物学的脱リン手段に供給する経
路、および該オゾン処理手段でオゾン処理した汚泥を該
生物学的脱リン手段に供給する経路とを有することを特
徴とする有機性汚水の生物学的脱リン装置、並びに、 （４）オゾン処理手段でオゾン処理した汚泥を生物学的
脱リン手段の嫌気部に供給することを特徴とする前記
（３）の有機性汚水の生物学的脱リン装置
、である。(2) The ozone-treated sludge is supplied to the anaerobic part of the biological dephosphorization step (1).
Biological dephosphorization process of organic wastewater, (3) An apparatus for purifying biologically the organic sewage have anaerobic-aerobic type biological dephosphorization device, a biological dephosphorization means An anaerobic part independent of the biological dephosphorization means for retaining a part of the drawn-out activated sludge and discharging the phosphorus component to the liquid side, or separating it after solid-liquid separation, and the phosphorus discharged to the liquid side. chemical phosphorus removal means for removing components, and ozone treatment means for ozonation another part of activated sludge withdrawn from the biological dephosphorization means, said
Obtained by solid-liquid separation of anaerobic part independent of biological dephosphorization
To supply the separated sludge thus obtained to the biological dephosphorization means.
And the sludge treated with ozone by the ozone treatment means.
A biological dephosphorization device for organic sewage, characterized in that it has a route for supplying it to biological dephosphorization means, and (4) biological sludge treated with ozone by means of ozone treatment means.
The above-mentioned characterized in that it is supplied to the anaerobic part of the dephosphorization means.
(3) A biological dephosphorization device for organic wastewater .
【０００７】[0007]
【発明の実施の形態】図１に本発明の方法および装置の
構成例を示す。図１の生物学的脱リン手段１の嫌気槽２
に有機性汚水（原水ともいう）１１と返送汚泥１３を流
入させ脱リン菌からリンを吐き出させた後、好気槽３に
流入させＢＯＤ除去と脱リン菌へのリン吸収をおこなわ
せる。固液分離手段４である沈殿槽で沈殿した汚泥の大
部分は返送汚泥１３として嫌気槽２にリサイクルされ
る。沈殿汚泥の１部または生物学的脱リン手段１の好気
槽３から直接引き抜いた汚泥を沈殿機能を持った生物学
的脱リン工程と独立した嫌気槽（第２嫌気槽）５に滞留
させたのち沈殿分離し、もしくは汚泥を沈殿分離しつつ
リン成分（主にリン酸イオン）を活性汚泥から液側に吐
き出させる。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT FIG. 1 shows an example of the configuration of the method and apparatus of the present invention. Anaerobic tank 2 of biological dephosphorization means 1 of FIG.
After the organic sewage (also referred to as raw water) 11 and the return sludge 13 are made to flow into and the phosphorus is discharged from the dephosphorization bacteria, they are made to flow into the aerobic tank 3 to remove BOD and absorb phosphorus to the dephosphorization bacteria. Most of the sludge settled in the settling tank, which is the solid-liquid separation means 4, is recycled to the anaerobic tank 2 as return sludge 13. Part of the settled sludge or sludge directly drawn from the aerobic tank 3 of the biological dephosphorization means 1 is retained in an anaerobic tank (second anaerobic tank) 5 independent of the biological dephosphorization step having a precipitation function. After that, the phosphorus component (mainly phosphate ion) is discharged from the activated sludge to the liquid side while performing sedimentation separation or sludge sedimentation separation.
【０００８】吐き出されたリン成分を、化学的リン除去
手段６において、消石灰、塩化鉄、硫酸アルミニウム等
の凝集剤２１の添加により凝集除去し、リン成分をヒド
ロキシアパタイトなどのリン酸カルシウム化合物、リン
酸鉄、リン酸アルミニウムとして分離回収（回収リン２
２として）する。なかでもカルシウムイオンはリン成分
をリン酸カルシウム肥料として回収できるので最適であ
る。リン除去手法としては、晶析脱リン法、吸着脱リン
法を適用しても良い。第２嫌気槽５においてリン成分を
吐き出した汚泥は生物学的脱リン手段１の嫌気槽２に返
送し再び原水１１の浄化に寄与される。The discharged phosphorus component is coagulated and removed in the chemical phosphorus removing means 6 by adding a flocculant 21 such as slaked lime, iron chloride, aluminum sulfate, etc., and the phosphorus component is calcium phosphate compound such as hydroxyapatite, iron phosphate. , Separated and recovered as aluminum phosphate (recovered phosphorus 2
2). Among them, calcium ion is most suitable because it can recover the phosphorus component as calcium phosphate fertilizer. As a phosphorus removal method, a crystallization dephosphorization method or an adsorption dephosphorization method may be applied. The sludge that has discharged the phosphorus component in the second anaerobic tank 5 is returned to the anaerobic tank 2 of the biological dephosphorization means 1 and contributes to the purification of the raw water 11 again.
【０００９】次に、生物学的脱リン手段１から引き抜い
た汚泥（活性汚泥の引き抜き場所としては、生物学的脱
リン手段１の好気槽３、または固液分離手段４である沈
殿槽からの汚泥のどちらでも良い。）の他の一部をオゾ
ン酸化槽７に導き、オゾンにより汚泥を酸化分解すると
汚泥から多量のＢＯＤ成分が生成し、汚泥の生物分解性
が著しく向上する。オゾン酸化された汚泥（オゾン酸化
汚泥ともいう）１４は生物学的脱リン手段１に供給さ
れ、オゾン酸化汚泥１４は微生物に資化され炭酸ガスと
水に分解される。オゾン酸化汚泥１４の供給位置として
は生物学的脱リン手段１の嫌気槽２が最適である。なぜ
ならＢＯＤ成分を多量に含むオゾン酸化汚泥１４を嫌気
槽２に流入させると、返送汚泥１３を構成する脱リン菌
へのストレスが高まり、効果的に脱リン菌からリンの吐
き出しが起きるからである。Next, the sludge drawn out from the biological dephosphorization means 1 (the activated sludge is drawn out from the aerobic tank 3 of the biological dephosphorization means 1 or the settling tank which is the solid-liquid separation means 4). The other part of the sludge may be introduced into the ozone oxidation tank 7 and the sludge is oxidatively decomposed by ozone to produce a large amount of BOD component from the sludge, and the biodegradability of the sludge is significantly improved. The ozone-oxidized sludge (also referred to as ozone-oxidized sludge) 14 is supplied to the biological dephosphorization means 1, and the ozone-oxidized sludge 14 is assimilated by microorganisms and decomposed into carbon dioxide gas and water. The anaerobic tank 2 of the biological dephosphorization means 1 is optimal as the supply position of the ozone oxidation sludge 14. This is because when the ozone-oxidizing sludge 14 containing a large amount of BOD component is caused to flow into the anaerobic tank 2, stress on the dephosphorizing bacteria constituting the returning sludge 13 is increased, and phosphorus is effectively discharged from the dephosphorizing bacteria. .
【００１０】他の実施の形態としては、生物学的脱リン
手段１の嫌気槽２の後の好気槽３の代わりに、脱窒素
槽、硝化槽を設け、生物学的脱リンと生物学的脱窒素を
同時に行なうことも当然可能である。このように本発明
は、「生物学的脱リン法において余剰汚泥量をゼロにす
ることはリンの物質収支的に不可能である」との固定観
念を初めて打破したものである。また「オゾンによる汚
泥消滅技術はリンを活性汚泥に取り込んだ形で系外に排
除できないから原理的にリン除去とは両立しえない」と
いう従来の認識を打破したものである。In another embodiment, a denitrification tank and a nitrification tank are provided in place of the anaerobic tank 3 after the anaerobic tank 2 of the biological dephosphorization means 1 to perform biological dephosphorization and biology. Naturally, it is also possible to carry out simultaneous denitrification. As described above, the present invention breaks down the stereotype that "it is impossible to reduce the amount of excess sludge to zero in the biological dephosphorization method in terms of phosphorus mass balance" for the first time. Moreover, the conventional recognition that "the technology for eliminating sludge by ozone cannot be compatible with phosphorus removal in principle because phosphorus cannot be removed from the system by incorporating it into activated sludge," is defeated.
【００１１】[0011]
【実施例】以下、本発明の実施例により、その効果をよ
り明らかにすることができる。
〔実施例〕図１の工程にしたがって下水（平均水質を表
１に示す）を対象に本発明の実証試験を行なった。表２
に試験条件を示す。The effects of the present invention can be clarified by the following examples of the present invention. [Example] A verification test of the present invention was conducted on sewage (average water quality is shown in Table 1) according to the process of FIG. Table 2
The test conditions are shown in.
【００１２】[0012]
【表１】 [Table 1]
【００１３】[0013]
【表２】 [Table 2]
【００１４】実験の結果、処理開始後２ヵ月後に処理状
況が安定状態になってからの沈殿槽からの処理水水質の
平均は表３のように高度にリン、ＢＯＤが除去されてい
た。また余剰汚泥は１年間の試験の間、引き抜かなかっ
たが、生物学的脱リン工程の嫌気槽、および好気槽のＭ
ＬＳＳは３５００〜４０００mg/lを維持したことから本
発明システムの系外に廃棄する余剰汚泥の発生は無かっ
たことが確認された。As a result of the experiment, as shown in Table 3, the average quality of treated water from the settling tank after the treatment condition became stable 2 months after the start of treatment showed that phosphorus and BOD were highly removed. The excess sludge was not extracted during the one-year test, but the anaerobic tank in the biological dephosphorization process and the aerobic tank M
Since LSS was maintained at 3500 to 4000 mg / l, it was confirmed that there was no generation of excess sludge to be discarded outside the system of the present invention.
【００１５】[0015]
【表３】 [Table 3]
【００１６】〔比較例１〕図１の工程において、第２嫌
気槽５を省略した以外は実施例と同じ条件で試験を行な
った。この場合、リン成分が汚泥から吐き出されないた
め、化学的リン除去手段にリン成分が流入しなくなり、
リン成分を回収することができず、処理水１２のリン濃
度は５．５ｍｇ／リットルに悪化し、リン除去率はほぼ
ゼロであった。
〔比較例２〕図１の工程において、オゾン酸化槽７を省
略した以外は実施例と同じ条件で試験を行なった。この
場合、余剰汚泥発生量が下水１ｍ3 あたり約６０ｇと大
幅に増加した。[Comparative Example 1] In the process of FIG. 1, a test was conducted under the same conditions as in Example except that the second anaerobic tank 5 was omitted. In this case, since the phosphorus component is not discharged from the sludge, the phosphorus component does not flow into the chemical phosphorus removing means,
The phosphorus component could not be recovered, the phosphorus concentration of the treated water 12 deteriorated to 5.5 mg / liter, and the phosphorus removal rate was almost zero. [Comparative Example 2] In the process of FIG. 1, a test was conducted under the same conditions as in Example except that the ozone oxidation tank 7 was omitted. In this case, the amount of excess sludge generated was significantly increased to about 60 g per 1 m 3 of sewage.
【００１７】[0017]
【発明の効果】本発明は、オゾンによる汚泥酸化法、生
物学的脱リン法および化学的なリン除去法を新規な思想
で結合した結果、余剰汚泥の発生量をゼロにでき、かつ
高度のリン除去を安定して行なうことができる。また本
発明は、脱リン菌に摂取されたリンをヒドロキシアパタ
イトなどの肥料資源として回収できる。INDUSTRIAL APPLICABILITY As a result of combining a sludge oxidation method using ozone, a biological dephosphorization method and a chemical phosphorus removal method with a novel idea, the present invention can reduce the amount of excess sludge generated to a high level. Phosphorus removal can be performed stably. Further, according to the present invention, phosphorus ingested by dephosphorization bacteria can be recovered as fertilizer resources such as hydroxyapatite.
【図面の簡単な説明】[Brief description of drawings]
【図１】本発明の処理装置の概略構成を示した図であ
る。FIG. 1 is a diagram showing a schematic configuration of a processing apparatus of the present invention.
１ 生物学的脱リン手段 ２ 嫌気槽 ３ 好気槽 ４ 固液分離手段 ５ 第２嫌気槽 ６ 化学的リン除去手段 ７ オゾン酸化槽 １１ 有機性汚水 １２ 処理水 １３ 返送汚泥 １４ オゾン酸化汚泥 ２１ 凝集剤 ２２ 回収リン 1 Biological dephosphorization means 2 Anaerobic tank 3 aerobic tank 4 Solid-liquid separation means 5 Second anaerobic tank 6 Chemical phosphorus removal means 7 Ozone oxidation tank 11 Organic wastewater 12 Treated water 13 Return sludge 14 Ozone-oxidizing sludge 21 Flocculant 22 Recovery phosphorus
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) C02F 3/12 C02F 3/28 - 3/34 C02F 11/00 - 11/20 ─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. 7 , DB name) C02F 3/12 C02F 3/28-3/34 C02F 11/00-11/20
Claims (4)
ン法により生物学的に浄化する方法において、該生物学
的脱リン工程から活性汚泥の一部を引き抜いて該生物学
的脱リン工程とは独立した嫌気的条件で滞留させ該活性
汚泥からリン成分を液側に吐き出させながらまたは吐き
出させたのち固液分離し、液側に吐き出されたリン成分
を化学的に除去し、これとは別に該生物学的脱リン工程
から引き抜いた活性汚泥の他の一部をオゾン処理し、該
生物学的脱リン工程とは独立した嫌気的条件でリン成分
を吐き出した後の前記固液分離汚泥およびオゾン処理し
た汚泥を該生物学的脱リン工程に供給することを特徴と
する有機性汚水の生物学的脱リン方法。1. A method for biologically purifying organic sewage by an anaerobic / aerobic biological dephosphorization method, wherein a part of activated sludge is extracted from the biological dephosphorization step. The activated sludge is allowed to stay under anaerobic conditions independent of the dephosphorization process, and the phosphorus component is discharged from the activated sludge to the liquid side or after being discharged, and solid-liquid separation is performed, and the phosphorus component discharged to the liquid side is chemically removed. Separately from this, the other part of the activated sludge extracted from the biological dephosphorization step is subjected to ozone treatment, and the phosphorus component is discharged under anaerobic conditions independent of the biological dephosphorization step. A biological dephosphorization method for organic wastewater, comprising supplying solid-liquid separation sludge and sludge treated with ozone to the biological dephosphorization step.
程の嫌気部に供給することを特徴とする請求項１記載の
有機性汚水の生物学的脱リン方法。2. The biological dephosphorization method of organic wastewater according to claim 1, wherein the ozone-treated sludge is supplied to the anaerobic part of the biological dephosphorization step.
有機性汚水を生物学的に浄化する装置において、該生物
学的脱リン手段から引き抜いた活性汚泥の一部を滞留さ
せリン成分を液側に吐き出させながらまたは吐き出させ
たのち固液分離する該生物学的脱リン手段とは独立した
嫌気部と、液側に吐き出されたリン成分を除去する化学
的リン除去手段と、該生物学的脱リン手段から引き抜い
た活性汚泥の他の一部をオゾン処理するオゾン処理手段
と、該生物学的脱リン手段とは独立した嫌気部の固液分
離で得られた分離汚泥を該生物学的脱リン手段に供給す
る経路、および該オゾン処理手段でオゾン処理した汚泥
を該生物学的脱リン手段に供給する経路とを有すること
を特徴とする有機性汚水の生物学的脱リン装置。 3. An apparatus for biologically purifying organic sewage having an anaerobic / aerobic biological dephosphorization means, in which a part of the activated sludge extracted from the biological dephosphorization means is retained. An anaerobic part independent of the biological dephosphorization means for solid-liquid separation after or while exhaling the phosphorus component to the liquid side, and a chemical phosphorus removing means for removing the phosphorus component exhaled to the liquid side. , biological and ozone treatment means another portion of the activated sludge withdrawn from the dephosphorization means ozone treatment, solid-liquid separation of independent anaerobic section and the biological dephosphorization means
The separated sludge obtained by separation is supplied to the biological dephosphorization means.
And the sludge treated with ozone by the ozone treatment means.
And a path for supplying the biological dephosphorization means to the biological dephosphorization means .
生物学的脱リン手段の嫌気部に供給することを特徴とすCharacterized by supplying to the anaerobic part of biological dephosphorization means
る請求項３記載の有機性汚水の生物学的脱リン装置。The biological dephosphorization apparatus of the organic wastewater according to claim 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17510296A JP3526140B2 (en) | 1996-07-04 | 1996-07-04 | Biological phosphorus removal method and apparatus for organic wastewater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17510296A JP3526140B2 (en) | 1996-07-04 | 1996-07-04 | Biological phosphorus removal method and apparatus for organic wastewater |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH1015585A JPH1015585A (en) | 1998-01-20 |
| JP3526140B2 true JP3526140B2 (en) | 2004-05-10 |
Family
ID=15990299
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17510296A Expired - Fee Related JP3526140B2 (en) | 1996-07-04 | 1996-07-04 | Biological phosphorus removal method and apparatus for organic wastewater |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3526140B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100362768B1 (en) * | 2000-06-28 | 2002-12-11 | 박노욱 | A process system of an erobic digestive fluid of a process means of food waste |
| JP4547799B2 (en) * | 2000-12-19 | 2010-09-22 | 栗田工業株式会社 | Biological phosphorus removal equipment |
| EP1364915A1 (en) * | 2002-05-22 | 2003-11-26 | Kurita Water Industries Ltd. | A biological method of phosphorus removal and biological phosphorus-removing apparatus |
| EP1555245A3 (en) * | 2002-05-22 | 2006-02-01 | Kurita Water Industries Ltd. | A biologial method of phosphorous removal and biological phosphorous-removing apparatus |
-
1996
- 1996-07-04 JP JP17510296A patent/JP3526140B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH1015585A (en) | 1998-01-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US6706185B2 (en) | Biological method of phosphorus removal and biological phosphorus-removing apparatus | |
| JP4742403B2 (en) | Wastewater treatment method | |
| JPH09122682A (en) | Method for treating waste water | |
| JP3473328B2 (en) | Biological dephosphorization equipment | |
| JPH09108690A (en) | Treatment of phosphorus containing sewage | |
| JP3817850B2 (en) | Biological phosphorus removal equipment | |
| JP3526140B2 (en) | Biological phosphorus removal method and apparatus for organic wastewater | |
| JP3355121B2 (en) | Organic wastewater treatment method | |
| JP3449855B2 (en) | Biological phosphorus removal method and apparatus for organic wastewater | |
| JP3442204B2 (en) | Organic wastewater phosphorus removal and recovery method | |
| JP3511430B2 (en) | Organic wastewater treatment method | |
| JPH1052697A (en) | Method for reduction of organic sludge | |
| JP2000140886A (en) | Equipment for treatment of nitrogen-containing drainage | |
| JPH08309366A (en) | Removal of nitrogen and phosphorus from waste water | |
| JP4547799B2 (en) | Biological phosphorus removal equipment | |
| EP1555245A2 (en) | A biologial method of phosphorous removal and biological phosphorous-removing apparatus | |
| JP4156820B2 (en) | Organic wastewater treatment method and treatment apparatus | |
| JP2003211186A (en) | Treatment method for sewage containing nitrogen and phosphorus and treatment apparatus therefor | |
| JP2002316191A (en) | Method and apparatus for treating organic foul water | |
| JPH0999293A (en) | Treatment of organic sewage | |
| JP3392295B2 (en) | Method and apparatus for treating organic sewage | |
| WO2003097540A1 (en) | Method of treating organic waste water capable of phosphorus recovery and apparatus | |
| JP3919999B2 (en) | Organic wastewater treatment method and apparatus | |
| JP2002320992A (en) | Method for treating organic waste water and equipment therefor | |
| JP4647814B2 (en) | Organic wastewater treatment equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| TRDD | Decision of grant or rejection written | ||
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20040212 |
|
| A61 | First payment of annual fees (during grant procedure) |
Free format text: JAPANESE INTERMEDIATE CODE: A61 Effective date: 20040212 |
|
| R150 | Certificate of patent or registration of utility model |
Free format text: JAPANESE INTERMEDIATE CODE: R150 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100227 Year of fee payment: 6 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110227 Year of fee payment: 7 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110227 Year of fee payment: 7 |
|
| S111 | Request for change of ownership or part of ownership |
Free format text: JAPANESE INTERMEDIATE CODE: R313111 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110227 Year of fee payment: 7 |
|
| R350 | Written notification of registration of transfer |
Free format text: JAPANESE INTERMEDIATE CODE: R350 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120227 Year of fee payment: 8 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120227 Year of fee payment: 8 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20130227 Year of fee payment: 9 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20140227 Year of fee payment: 10 |
|
| LAPS | Cancellation because of no payment of annual fees |