JP3100441B2 - Treatment of nitrogen and phosphorus in sewage - Google Patents
Treatment of nitrogen and phosphorus in sewageInfo
- Publication number
- JP3100441B2 JP3100441B2 JP33535791A JP33535791A JP3100441B2 JP 3100441 B2 JP3100441 B2 JP 3100441B2 JP 33535791 A JP33535791 A JP 33535791A JP 33535791 A JP33535791 A JP 33535791A JP 3100441 B2 JP3100441 B2 JP 3100441B2
- Authority
- JP
- Japan
- Prior art keywords
- tank
- aeration
- phosphorus
- nitrogen
- orp
- 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
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
Description
【０００１】[0001]
【産業上の利用分野】本発明は間欠曝気活性汚泥処理に
より排水から窒素・リンを同時除去する汚水中の窒素・
リンの処理方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the simultaneous removal of nitrogen and phosphorus from wastewater by intermittent aeration activated sludge treatment.
The present invention relates to a method for treating phosphorus.
【０００２】[0002]
【従来の技術】近年、汚水中の窒素・リンの除去技術と
して、運転コストの低廉さや維持管理のし易さなどから
生物処理法が注目されている。2. Description of the Related Art In recent years, a biological treatment method has attracted attention as a technique for removing nitrogen and phosphorus from wastewater because of its low operating cost and ease of maintenance.
【０００３】例えば、従来、汚水中の窒素を除去する方
法としては、生物学的硝化・脱窒法が多用されている。
この方法は硝化工程と脱窒工程とからなり、水中のアン
モニア性窒素は硝化菌により硝酸性窒素に酸化される
（次式参照）。For example, a biological nitrification / denitrification method has been frequently used as a method for removing nitrogen in wastewater.
This method includes a nitrification step and a denitrification step, and ammonia nitrogen in water is oxidized to nitrate nitrogen by nitrifying bacteria (see the following formula).
【０００４】 ＮＨ4 + ＋２Ｏ2 →ＮＯ3 ＋Ｈ2 Ｏ＋２Ｈ+ 次に硝酸性窒素は脱窒菌により窒素ガスに変換される
（次式参照）。 ２ＮＯ3 - ＋１０Ｈ+ →Ｎ2 ＋４Ｈ2 Ｏ＋２ＯＨ- このような硝化と脱窒を組み合わせた処理方法として、
循環脱窒活性汚泥法、間欠曝気活性汚泥法、回分式活性
汚泥法などがある。NH 4 + +2 O 2 → NO 3 + H 2 O + 2H + Next, nitrate nitrogen is converted into nitrogen gas by denitrifying bacteria (see the following formula). As processing method combining such nitrification and denitrification, - 2NO 3 - + 10H + → N 2 + 4H 2 O + 2OH
There are a circulating denitrification activated sludge method, an intermittent aeration activated sludge method and a batch activated sludge method.
【０００５】一方、汚水中のリンを生物学的に除去する
方法としては嫌気−好気活性汚泥法がある。この方法は
活性汚泥を嫌気状態にしておくとリンを放出し、次いで
好気状態にすると逆に、活性汚泥は嫌気状態において放
出した量以上のリンを吸収するというリンの過剰摂取現
象を利用してリンを除去する技術である。On the other hand, as a method for biologically removing phosphorus in wastewater, there is an anaerobic-aerobic activated sludge method. This method uses the phosphorus overdose phenomenon, in which activated sludge releases phosphorous when kept in an anaerobic state, and then reverses when the activated sludge is brought to an aerobic state. This is a technology to remove phosphorus.
【０００６】しかし、このような処理法は各々、窒素除
去あるいはリン除去と別個の目的に対して実施されてき
た技術であり、窒素とリンを同時に除去しようとするも
のではなかった。[0006] However, each of these treatment methods has been practiced for a purpose different from nitrogen removal or phosphorus removal, and has not been intended to remove nitrogen and phosphorus at the same time.
【０００７】[0007]
【発明が解決しようとする課題】本発明はこのような課
題を解決するもので、汚水中の窒素とリンを同時に除去
できる処理方法を提供することを目的とするものであ
る。SUMMARY OF THE INVENTION An object of the present invention is to solve such a problem, and an object of the present invention is to provide a treatment method capable of simultaneously removing nitrogen and phosphorus in wastewater.
【０００８】[0008]
【課題を解決するための手段】本発明者らは、このよう
な課題を解決するために鋭意研究した結果、曝気槽を少
なくとも２つの槽で構成し、各槽のＯＲＰ値を特定の値
になるように空気の供給を制御すると、汚水中の窒素と
リンを同時に除去できることを見い出し、本発明を完成
した。Means for Solving the Problems The present inventors have made intensive studies to solve such problems, and as a result, constituted an aeration tank with at least two tanks, and set the ORP value of each tank to a specific value. By controlling the supply of air so that the nitrogen and phosphorus in the wastewater can be removed at the same time, the present invention has been completed.
【０００９】すなわち本発明は、曝気槽へ導入された汚
水に間欠的に空気を供給し、曝気・非曝気を交互に繰り
返して活性汚泥処理された汚水を沈澱槽に導き、この沈
澱槽で固液分離を行なって上澄水を放流し、沈澱汚泥を
曝気槽へ返送する間欠曝気活性汚泥処理法において、前
記曝気槽を少なくとも２つの槽で構成し、各槽にＯＲＰ
計を設置し、第１の槽でＯＲＰ値が非曝気工程において
−５０ｍｖ以下、曝気工程において０ｍｖ以上になるよ
うに、また第２の槽で全工程においてＯＲＰ値が０ｍｖ
以上になるように空気の供給を制御することを要旨とす
るものである。That is, according to the present invention, air is intermittently supplied to the wastewater introduced into the aeration tank, and aeration / non-aeration is alternately repeated to guide the activated sludge-treated wastewater to the sedimentation tank. In the intermittent aeration activated sludge treatment method in which liquid separation is performed, supernatant water is discharged, and the settled sludge is returned to the aeration tank, the aeration tank is composed of at least two tanks, and each tank has an ORP.
The ORP value is set to be −50 mv or less in the non-aeration step in the first tank, 0 mv or more in the aeration step, and the ORP value is 0 mv in all the steps in the second tank.
The gist of the invention is to control the supply of air as described above.
【００１０】以下、本発明を詳細に説明すると、曝気槽
を、汚水が流入する第１の槽と、汚水を沈澱槽へ流出す
る第２の槽とで構成し、ＢＯＤ濃度が高く、嫌気雰囲気
にある（ＯＲＰ値がマイナスになり易い）第１の槽にお
いては非曝気（嫌気）工程でのＯＲＰ値を−５０ｍｖ以
下とし、また曝気（好気）工程において０ｍｖ以上にな
るようにし、ＯＲＰ値がマイナス状態におけるリンの
放出、ＯＲＰ値がプラス状態におけるリンの過剰摂取
という生物学的脱リン作用を進め、また同時に生物学的
硝化・脱窒作用が起こるように間欠曝気の空気量の制御
を行なうものである。次いで、第２の槽においては後続
する沈澱槽において沈澱した汚泥が嫌気状態となって、
再びリンを吐き出さないように曝気・非曝気の全工程に
おいてＯＲＰ値が０ｍｖ以上になるように空気を供給
し、且つ間欠曝気によって生物学的硝化・脱窒作用もさ
らに進めるように空気量を制御する。In the following, the present invention will be described in detail. The aeration tank is composed of a first tank into which sewage flows, and a second tank into which sewage flows out into a sedimentation tank. In the first tank (the ORP value is likely to be negative), the ORP value in the non-aeration (anaerobic) process is set to -50 mv or less, and the ORP value is set to 0 mv or more in the aeration (aerobic) process. Promotes the biological dephosphorization effect of releasing phosphorus in the negative state and excessive intake of phosphorus in the positive state of the ORP value, and at the same time controls the air volume of intermittent aeration so that biological nitrification and denitrification occur. It is what you do. Next, in the second tank, the sludge settled in the subsequent settling tank becomes anaerobic,
Air is supplied so that the ORP value becomes 0 mv or more in all aeration and non-aeration processes so that phosphorus is not discharged again, and the amount of air is controlled so as to further promote biological nitrification and denitrification by intermittent aeration. I do.
【００１１】ところで、第１の槽でＯＲＰ値が非曝気工
程において−５０ｍｖ以下としたのは、−５０ｍｖより
高いと、活性汚泥からリンの放出（吐き出し）が起こら
ず、また、第１の槽でＯＲＰ値が曝気工程において０ｍ
ｖ以上としたのは、０ｍｖ未満であると、リンの吸収
（取り込み）が起こりにくいからである。さらに、第２
の槽で全工程においてＯＲＰ値が０ｍｖ以上としたの
は、０ｍｖ未満であると、沈澱槽において、沈澱汚泥が
嫌気化して再びリンの放出が起こり、処理水中のリン濃
度が増加するためである。By the way, the reason why the ORP value is set to -50 mv or less in the non-aeration step in the first tank is that if the ORP value is higher than -50 mv, phosphorus is not released (exhausted) from the activated sludge. ORP value is 0m in the aeration process
The reason for the value of v or more is that if the value is less than 0 mv, absorption (uptake) of phosphorus hardly occurs. Furthermore, the second
The reason that the ORP value was set to 0 mv or more in all the steps in the tank was that if the ORP value was less than 0 mv, the precipitated sludge was anaerobic in the settling tank and phosphorus was released again, and the phosphorus concentration in the treated water increased. .
【００１２】[0012]
【作用】この構成によれば、分割された曝気槽の各槽内
のＯＲＰ値を指標として、空気の供給を制御することに
より、汚水中の窒素・リンの同時除去を行なうことがで
きる。According to this structure, the supply of air is controlled by using the ORP value in each of the divided aeration tanks as an index, thereby enabling simultaneous removal of nitrogen and phosphorus in the wastewater.
【００１３】[0013]
【実施例】以下、本発明の実施例について、図面を参照
しながら詳細に説明する。団地下水を長時間曝気法によ
り処理を行なっている施設において、本発明の制御法を
適用して運転を行なった。曝気槽にかかるＢＯＤ負荷は
０．１８ｋｇ−ＢＯＤ／ｍ3 日、滞留時間は２５時間で
ある。曝気槽は同容量の矩形の２槽の直列構造からなっ
ており、各槽の末端部にそれぞれＯＲＰ計を設置して空
気量の制御を行なった。図１に処理フローを示してお
り、汚水１は連続的に曝気槽２に導入され、ここで間欠
曝気されたのち沈澱槽３に流入し、この沈澱槽３で上澄
水は処理水４として放流され、沈澱汚泥５は曝気槽２へ
返送される。上記曝気槽２内には間欠的に空気が供給さ
れ、曝気と非曝気が１サイクルとなり、汚水は好気状態
と嫌気状態とを交互に繰り返して処理される。ここで、
曝気槽２は前後に２槽に分割され、各槽２ａ、２ｂに供
給される空気はＯＲＰ計６ａとＯＲＰ計６ｂの値によ
り、前段に位置する第１の槽２ａではＯＲＰ値が非曝気
工程において−５０ｍｖ以下、曝気工程において０ｍｖ
以上となるようにし、後段に位置する第２の槽２ｂでは
全工程において０ｍｖ以上となるようにタイマー制御に
より各工程の時間を設定することにより決められる。Embodiments of the present invention will be described below in detail with reference to the drawings. In a facility where the groundwater was treated by the aeration method for a long time, the operation was performed by applying the control method of the present invention. The BOD load applied to the aeration tank is 0.18 kg-BOD / m 3 days, and the residence time is 25 hours. The aeration tank had a series structure of two rectangular tanks of the same capacity, and an ORP meter was installed at the end of each tank to control the amount of air. FIG. 1 shows a treatment flow, in which sewage 1 is continuously introduced into an aeration tank 2, where it is intermittently aerated and then flows into a sedimentation tank 3, where supernatant water is discharged as treated water 4. The settled sludge 5 is returned to the aeration tank 2. Air is intermittently supplied into the aeration tank 2, and aeration and non-aeration are performed in one cycle, and sewage is treated by alternately repeating an aerobic state and an anaerobic state. here,
The aeration tank 2 is divided into two tanks before and after, and the air supplied to each of the tanks 2a and 2b is determined based on the values of the ORP meter 6a and the ORP meter 6b. -50 mv or less, 0 mv in the aeration step
In the second tank 2b located at the subsequent stage, the time is determined by setting the time of each step by timer control so that the pressure becomes 0 mv or more in all the steps.
【００１４】そこで、表１に示す条件で制御を行なった
結果、表２に示す曝気条件が得られた。Then, as a result of controlling under the conditions shown in Table 1, the aeration conditions shown in Table 2 were obtained.
【００１５】[0015]
【表１】 [Table 1]
【００１６】[0016]
【表２】 [Table 2]
【００１７】その結果、ＢＯＤ１８７ｍｇ／リットル、
全窒素３８．４ｍｇ／リットル、全リン４．８ｍｇ／リ
ットルの原水に対し、ＢＯＤ３ｍｇ／リットル（除去率
９８％）、全窒素１．８ｍｇ／リットル（除去率９５
％）、全リン０．３ｍｇ／リットル（除去率９４％）の
処理水が得られ、９０％以上の窒素・リンが同時に除去
できた。As a result, BOD 187 mg / liter,
For raw water having 38.4 mg / liter of total nitrogen and 4.8 mg / liter of total phosphorus, 3 mg / liter of BOD (98% removal rate) and 1.8 mg / liter of total nitrogen (95% removal rate)
%) And treated water having a total phosphorus of 0.3 mg / liter (removal rate: 94%), and 90% or more of nitrogen and phosphorus could be simultaneously removed.
【００１８】ところで、図面に示す実施例では曝気槽２
は第１の槽２ａと第２の槽２ｂとで構成しているが、３
つ以上の槽で構成してもよい。また、第１の槽２ａと第
２の槽２ｂをそれぞれさらに複数の槽で構成してもよ
い。さらに、これらの槽は互いに独立させて設けてもよ
く、あるいは１つの槽内に仕切りを設けて仕切ることに
より構成してもよい。また、タイマーによる曝気条件の
制御以外に各曝気槽内のＯＲＰ値を指標とし、ＯＲＰ値
の設定値（例えば表１の値）により、曝気槽のオン、オ
フをタイマーなしで制御しても何ら支障はない。In the embodiment shown in the drawings, the aeration tank 2
Is composed of a first tank 2a and a second tank 2b.
You may comprise more than one tank. Further, the first tank 2a and the second tank 2b may be each further constituted by a plurality of tanks. Further, these tanks may be provided independently of each other, or may be constituted by providing a partition in one tank and partitioning it. In addition to the control of the aeration condition by the timer, the ORP value in each aeration tank is used as an index, and the ON / OFF of the aeration tank is controlled without a timer by the set value of the ORP value (for example, the value in Table 1). No problem.
【００１９】[0019]
【発明の効果】以上のように本発明によれば、間欠曝気
活性汚泥処理法において、曝気槽を少なくとも第１の槽
と第２の槽とで構成し、各槽にＯＲＰ計を設置し、第１
の槽でＯＲＰ値が非曝気（嫌気）工程において−５０ｍ
ｖ以下、曝気（好気）工程において０ｍｖ以上になるよ
うにし、第２の槽で全工程においてＯＲＰ値が０ｍｖ以
上になるように空気の供給を制御することにより、汚水
中の窒素・リンの同時除去を行なうことができる。As described above, according to the present invention, in an intermittent aeration activated sludge treatment method, an aeration tank is constituted by at least a first tank and a second tank, and an ORP meter is installed in each tank. First
ORP value is -50m in non-aeration (anaerobic) process
v or less in the aeration (aerobic) step, and by controlling the air supply in the second tank so that the ORP value becomes 0 mv or more in all the steps, the nitrogen and phosphorus in the wastewater can be reduced. Simultaneous removal can be performed.
【図１】本発明の実施例における処理フローを示す説明
図である。FIG. 1 is an explanatory diagram showing a processing flow in an embodiment of the present invention.
１ 汚水 ２ 曝気槽 ２ａ 第１の槽 ２ｂ 第２の槽 ３ 沈澱槽 ４ 処理水 ５ 沈澱汚泥 ６ａ ＯＲＰ計 ６ｂ ＯＲＰ計 DESCRIPTION OF SYMBOLS 1 Sewage 2 Aeration tank 2a 1st tank 2b 2nd tank 3 Precipitation tank 4 Treated water 5 Precipitated sludge 6a ORP meter 6b ORP meter
フロントページの続き (56)参考文献 特開 平４−104896（ＪＰ，Ａ) 特開 昭62−286597（ＪＰ，Ａ) 特開 昭61−54295（ＪＰ，Ａ) 実開 昭63−20999（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.7，ＤＢ名) C02F 3/30 C02F 3/12 Continuation of the front page (56) References JP-A-4-104896 (JP, A) JP-A-62-286597 (JP, A) JP-A-61-54295 (JP, A) , U) (58) Field surveyed (Int.Cl. 7 , DB name) C02F 3/30 C02F 3/12
Claims (1)
を供給し、曝気・非曝気を交互に繰り返して活性汚泥処
理された汚水を沈澱槽に導き、この沈澱槽で固液分離を
行なって上澄水を放流し、沈澱汚泥を曝気槽へ返送する
間欠曝気活性汚泥処理法において、前記曝気槽を少なく
とも２つの槽で構成し、各槽にＯＲＰ計を設置し、第１
の槽でＯＲＰ値が非曝気工程において−５０ｍｖ以下、
曝気工程において０ｍｖ以上になるように、また第２の
槽で全工程においてＯＲＰ値が０ｍｖ以上になるように
空気の供給を制御することを特徴とする汚水中の窒素・
リンの処理方法。1. An intermittent supply of air to sewage introduced into an aeration tank, alternately repeating aeration and non-aeration to guide activated sludge-treated sewage to a settling tank, where solid-liquid separation is performed in the settling tank. In the intermittent aeration activated sludge treatment method, in which the supernatant water is discharged and the settled sludge is returned to the aeration tank, the aeration tank is composed of at least two tanks, and an ORP meter is installed in each tank.
ORP value in the non-aeration step in the tank of -50mv or less,
The air supply is controlled so that it becomes 0 mv or more in the aeration step and the ORP value becomes 0 mv or more in all the steps in the second tank.
How to treat phosphorus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33535791A JP3100441B2 (en) | 1991-12-19 | 1991-12-19 | Treatment of nitrogen and phosphorus in sewage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33535791A JP3100441B2 (en) | 1991-12-19 | 1991-12-19 | Treatment of nitrogen and phosphorus in sewage |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05169087A JPH05169087A (en) | 1993-07-09 |
| JP3100441B2 true JP3100441B2 (en) | 2000-10-16 |
Family
ID=18287628
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP33535791A Expired - Fee Related JP3100441B2 (en) | 1991-12-19 | 1991-12-19 | Treatment of nitrogen and phosphorus in sewage |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3100441B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100357771B1 (en) * | 2002-06-04 | 2002-10-25 | 세림제지주식회사 | The advanced wastewater treatment method and equipment using the circular oxidation ditch of intermittent aeration method to improve the removal of nitrogen and phosphorus |
| JP2023046420A (en) * | 2020-03-13 | 2023-04-05 | 株式会社クラレ | Wastewater treatment method |
-
1991
- 1991-12-19 JP JP33535791A patent/JP3100441B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05169087A (en) | 1993-07-09 |
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