JP3467671B2 - Nitrification denitrification method - Google Patents
Nitrification denitrification methodInfo
- Publication number
- JP3467671B2 JP3467671B2 JP25430796A JP25430796A JP3467671B2 JP 3467671 B2 JP3467671 B2 JP 3467671B2 JP 25430796 A JP25430796 A JP 25430796A JP 25430796 A JP25430796 A JP 25430796A JP 3467671 B2 JP3467671 B2 JP 3467671B2
- Authority
- JP
- Japan
- Prior art keywords
- tank
- denitrification
- nitrification
- waste water
- pump
- 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
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、下水、産業排
水、し尿等の有機性排水に含まれるアンモニア態窒素を
生物学的硝化および脱窒反応を用いて窒素ガスに還元し
て除去する硝化脱窒方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to nitrification denitrification for removing ammonia nitrogen contained in organic wastewater such as sewage, industrial wastewater and human waste by reducing it to nitrogen gas using biological nitrification and denitrification reactions. Concerning the method of sequestration.
【０００２】[0002]
【従来の技術と発明が解決しようとする課題】従来、こ
の種硝化脱窒方法として、原水槽内の有機性排水を、送
液ポンプにより脱窒槽および硝化槽に順々に送り込むと
ともに、循環ポンプにより両槽間で循環させることによ
り、有機性排水中に含まれるアンモニア態窒素を生物学
的硝化および脱窒反応を用いて窒素ガスに還元して除去
し、さらに吸引ポンプを用いて、硝化槽内の排水中に浸
漬された濾過膜ユニットにより汚泥と処理水とを分離す
る方法が知られている。2. Description of the Related Art Conventionally, as this kind of nitrification denitrification method, organic drainage in a raw water tank is sequentially fed to a denitrification tank and a nitrification tank by a liquid feed pump, and a circulation pump is also used. By circulating it between the two tanks, ammonia nitrogen contained in the organic wastewater is reduced to nitrogen gas by using biological nitrification and denitrification reactions, and is further removed by a suction pump. There is known a method of separating sludge and treated water by a filtration membrane unit immersed in the waste water inside.
【０００３】ところが、従来の方法では、原水槽内の有
機性排水を脱窒槽に送り込む送液ポンプと吸引ポンプと
が別々に制御されていたので、原水槽内の有機性排水の
液面レベルが下がって送液ポンプが停止した場合にも吸
引ポンプの運転が続けられることがあり、膜の空引きの
おそれがあった。また、脱窒槽内の有機性排水を硝化槽
に送り込む送液ポンプも吸引ポンプとは別々に制御され
ていたので、脱窒槽内の有機性排水を硝化槽に送る送液
ポンプが故障等により停止した場合にも吸引ポンプの運
転が続けられることがあり、この場合にも膜の空引きの
おそれがあった。However, in the conventional method, since the liquid feed pump for feeding the organic waste water in the raw water tank to the denitrification tank and the suction pump are separately controlled, the liquid surface level of the organic waste water in the raw water tank is controlled. Even if the liquid delivery pump went down and stopped, the suction pump could continue to operate, and there was a risk of emptying the membrane. In addition, the liquid feed pump that feeds the organic waste water in the denitrification tank to the nitrification tank was also controlled separately from the suction pump, so the liquid feed pump that sends the organic waste water in the denitrification tank to the nitrification tank stopped due to a failure, etc. The suction pump may continue to be operated even in this case, and in this case as well, there was a risk of emptying the membrane.
【０００４】また、従来の方法において、吸引ポンプに
よる膜の空引きを防止するために、硝化槽内の有機性排
水の液面レベルを検出し、これに基いて吸引ポンプの作
動、停止を制御することも考えられていた。ところが、
この場合、硝化槽の上方に制御のための機器類を配置す
る必要があるので、濾過膜ユニットの膜の交換およびメ
ンテナンスを簡単に行うことができないという問題があ
った。Further, in the conventional method, in order to prevent the membrane from being drained by the suction pump, the liquid level of the organic waste water in the nitrification tank is detected, and the operation of the suction pump is controlled based on the detected level. It was also considered to do. However,
In this case, since it is necessary to arrange devices for control above the nitrification tank, there is a problem that the membrane of the filtration membrane unit cannot be easily replaced and maintained.
【０００５】また、従来の方法では、有機性排水を、原
水槽から脱窒槽に送る送液ポンプおよび脱窒槽から硝化
槽に送る送液ポンプとしては、それぞれ定量ポンプが用
いられていたので、コストが高くなるとともにメンテナ
ンスが面倒であるという問題があった。しかも、定量ポ
ンプは、槽外に配置されるので、従来法を実施すると装
置全体が大型化するという問題があった。Further, in the conventional method, since quantitative pumps were used as the liquid feed pumps for sending the organic waste water from the raw water tank to the denitrification tank and the liquid feed pumps for sending the organic waste water from the denitrification tank to the nitrification tank, the cost was reduced. There was a problem that the maintenance cost was high and the maintenance was troublesome. Moreover, since the metering pump is arranged outside the tank, there is a problem that the whole apparatus becomes large when the conventional method is carried out.
【０００６】また、従来の方法では、脱窒槽内におい
て、槽内底部に汚泥が澱み、汚泥の沈殿が生じるととも
に、窒素ガスが付着した汚泥が槽内液の上層部に溜ま
り、その結果槽内の汚泥密度の分布に極端な偏りがで
き、反応効率が悪くなる。そこで、このような問題を防
止するために、脱窒槽内に攪拌機を設置し、この攪拌機
で槽内の液を攪拌している。ところが、この場合、攪拌
機設置のためのイニシャルコストおよび攪拌機のメンテ
ナンスのためのランニングコストが高くなるという問題
があった。Further, according to the conventional method, in the denitrification tank, sludge is settled at the bottom of the tank and sludge is precipitated, and sludge to which nitrogen gas is adhered is accumulated in the upper layer of the liquid in the tank. Extremely uneven distribution of sludge density will result in poor reaction efficiency. Therefore, in order to prevent such a problem, a stirrer is installed in the denitrification tank and the stirrer stirs the liquid in the tank. However, in this case, there is a problem that the initial cost for installing the stirrer and the running cost for maintenance of the stirrer increase.
【０００７】さらに、従来の方法では、有機性排水を循
環ポンプにより脱窒槽および硝化槽間で循環させていた
が、そのために、循環ポンプ設置のためのイニシャルコ
ストおよび循環ポンプのメンテナンスのためのランニン
グコストが高くなるという問題があった。Further, in the conventional method, the organic waste water is circulated between the denitrification tank and the nitrification tank by the circulation pump. Therefore, the initial cost for installing the circulation pump and the running for maintenance of the circulation pump are required. There was a problem of high cost.
【０００８】この発明の目的は、上記問題を解決し、吸
引ポンプによる膜の空引きを防止しうる硝化脱窒方法を
提供することにある。An object of the present invention is to solve the above problems and to provide a nitrification / denitrification method capable of preventing emptying of a membrane by a suction pump.
【０００９】[0009]
【課題を解決するための手段と発明の効果】この発明に
よる硝化脱窒方法は、原水槽内の有機性排水を、送液ポ
ンプにより脱窒槽および硝化槽に順々に送り込むととも
に両槽間で循環させることにより、有機性排水中に含ま
れるアンモニア態窒素を生物学的硝化および脱窒反応を
用いて窒素ガスに還元して除去し、さらに吸引ポンプを
用いて、硝化槽内の排水中に浸漬された濾過膜ユニット
により汚泥と処理水とを分離する硝化脱窒方法であっ
て、原水槽から脱窒槽に有機性排水を送り込む送液ポン
プが作動している場合にのみ吸引ポンプを作動させるよ
うにし、さらに有機性排水を送液ポンプにより脱窒槽か
ら硝化槽へ送る導管を途中で分岐させ、分岐部の先端を
脱窒槽内に開口させ、脱窒槽から硝化槽へ送り込まれる
有機性排水の一部を脱窒槽内の有機性排水中に吹出させ
ることを特徴とするものである。Means for Solving the Problems and Effects of the Invention According to the nitrification / denitrification method of the present invention, the organic waste water in the raw water tank is sequentially fed to the denitrification tank and the nitrification tank by a liquid feed pump, and between the two tanks. By circulating it, ammonia nitrogen contained in the organic wastewater is reduced to nitrogen gas by using biological nitrification and denitrification reaction, and further removed by suction pump into the wastewater in the nitrification tank. A nitrification denitrification method that separates sludge and treated water by an immersed filtration membrane unit, and operates the suction pump only when the liquid feed pump that feeds organic wastewater from the raw water tank to the denitrification tank is operating. Yo
In addition, the organic waste water is sent to a denitrification tank by a liquid delivery pump.
The branch pipe to the nitrification tank midway, and
It is opened in the denitrification tank and sent from the denitrification tank to the nitrification tank.
Part of the organic wastewater is blown into the organic wastewater in the denitrification tank.
It is characterized in that that.
【００１０】この発明の方法によれば、原水槽から脱窒
槽に有機性排水を送り込む送液ポンプが作動している場
合にのみ吸引ポンプを作動させているので、送液ポンプ
が故障した等のように、送液ポンプが停止し、送液ポン
プによる原水槽から脱窒槽への有機性排水の供給が停止
した場合には、吸引ポンプの作動が確実に停止させられ
る。したがって、吸引ポンプによる膜の空引きが防止さ
れ、膜の長寿命化が図れる。また、有機性排水を送液ポ
ンプにより脱窒槽から硝化槽へ送る導管を途中で分岐さ
せ、分岐部の先端を脱窒槽内に開口させ、脱窒槽から硝
化槽へ送り込まれる有機性排水の一部を脱窒槽内の有機
性排水中に吹出させる場合、脱窒槽内の有機性排水中に
吹出させれた有機性排水により、この槽内の液が攪拌さ
れる。したがって、従来のように、攪拌機を別途設置す
る必要はなく、攪拌機設置のためのイニシャルコストお
よび攪拌機のメンテナンスのためのランニングコストが
不要になる。According to the method of the present invention, since the suction pump is operated only when the liquid feed pump for feeding the organic wastewater from the raw water tank to the denitrification tank is operating, the liquid feed pump may be damaged. As described above, when the liquid feed pump is stopped and the supply of the organic waste water from the raw water tank to the denitrification tank is stopped by the liquid feed pump, the operation of the suction pump is surely stopped. Therefore, emptying of the membrane by the suction pump is prevented, and the life of the membrane can be extended. In addition, the organic wastewater
The branch pipe from the denitrification tank to the nitrification tank.
Open the tip of the branch into the denitrification tank, and remove the glass from the denitrification tank.
Part of the organic wastewater sent to the sewage treatment tank is used
When blowing out into organic wastewater,
The liquid in this tank is agitated by the discharged organic waste water.
Be done. Therefore, as in the past, a separate stirrer must be installed.
The initial cost for installing the stirrer is not necessary.
And running cost for agitator maintenance
It becomes unnecessary .
【００１１】上記硝化脱窒方法において、原水槽内の液
面レベルに応じて、吸引ポンプの作動、停止を制御する
ことがある。この場合、硝化槽の上方には制御のための
機器類を配置する必要がないので、濾過膜ユニットの膜
の交換およびメンテナンスを簡単に行うことができる。In the above nitrification and denitrification method, the operation and stop of the suction pump may be controlled depending on the liquid level in the raw water tank. In this case, since it is not necessary to arrange control equipment above the nitrification tank, it is possible to easily replace and maintain the membrane of the filtration membrane unit.
【００１２】この発明による他の硝化脱窒方法は、原水
槽内の有機性排水を、送液ポンプにより脱窒槽および硝
化槽に順々に送り込むとともに両槽間で循環させること
により、有機性排水中に含まれるアンモニア態窒素を生
物学的硝化および脱窒反応を用いて窒素ガスに還元して
除去し、さらに吸引ポンプを用いて、硝化槽内の排水中
に浸漬された濾過膜ユニットにより汚泥と処理水とを分
離する硝化脱窒方法であって、脱窒槽から硝化槽に有機
性排水を送り込む送液ポンプが作動している場合にのみ
吸引ポンプを作動させるようにし、さらに有機性排水を
送液ポンプにより脱窒槽から硝化槽へ送る導管を途中で
分岐させ、分岐部の先端を脱窒槽内に開口させ、脱窒槽
から硝化槽へ送り込まれる有機性排水の一部を脱窒槽内
の有機性排水中に吹出させることを特徴とするものであ
る。Another nitrification denitrification method according to the present invention is a method for feeding organic wastewater in a raw water tank to a denitrification tank and a nitrification tank by a liquid feed pump in order and circulating the organic wastewater. Ammonia nitrogen contained in the product is reduced to nitrogen gas by using biological nitrification and denitrification reaction, and further, a suction pump is used to remove sludge by the filtration membrane unit immersed in the wastewater in the nitrification tank. It is a nitrification denitrification method that separates the treated water and the treated water.The suction pump is activated only when the liquid feed pump that feeds the organic wastewater from the denitrification tank to the nitrification tank is operating , and the organic wastewater is further removed.
In the middle of the conduit for sending from the denitrification tank to the nitrification tank by the liquid sending pump
Branch and open the tip of the branch into the denitrification tank.
Part of the organic wastewater sent from the nitriding tank to the nitrification tank
It is characterized by being blown into the organic waste water .
【００１３】この発明の他の方法によれば、脱窒槽から
硝化槽に有機性排水を送り込む送液ポンプが作動してい
る場合にのみ吸引ポンプを作動させているので、送液ポ
ンプが故障した等のように、送液ポンプが停止し、送液
ポンプによる脱窒槽から硝化槽への有機性排水の供給が
停止した場合には、吸引ポンプの作動が確実に停止させ
られる。したがって、吸引ポンプによる膜の空引きが防
止され、膜の長寿命化が図れる。また、有機性排水を送
液ポンプにより脱窒槽から硝化槽へ送る導管を途中で分
岐させ、分岐部の先端を脱窒槽内に開口させ、脱窒槽か
ら硝化槽へ送り込まれる有機性排水の一部を脱窒槽内の
有機性排水中に吹出させる場合、脱窒槽内の有機性排水
中に吹出させれた有機性排水により、この槽内の液が攪
拌される。したがって、従来のように、攪拌機を別途設
置する必要はなく、攪拌機設置のためのイニシャルコス
トおよび攪拌機のメンテナンスのためのランニングコス
トが不要になる。According to another method of the present invention, since the suction pump is operated only when the liquid feed pump for feeding the organic wastewater from the denitrification tank to the nitrification tank is operating, the liquid feed pump fails. As described above, when the liquid feed pump is stopped and the supply of the organic waste water from the denitrification tank to the nitrification tank by the liquid feed pump is stopped, the operation of the suction pump is surely stopped. Therefore, emptying of the membrane by the suction pump is prevented, and the life of the membrane can be extended. It also sends organic wastewater.
A liquid pump is used to divide the conduit from the denitrification tank to the nitrification tank.
The denitrification tank by opening the tip of the branch into the denitrification tank.
Part of the organic wastewater sent to the nitrification tank from the denitrification tank
When blowing into organic wastewater, the organic wastewater in the denitrification tank
The liquid in this tank is agitated by the organic wastewater blown out inside.
Be stirred. Therefore, as in the past, a separate stirrer was installed.
There is no need to place it, and the initial cost for installing the stirrer
Running cost for maintenance of the mixer and stirrer
Unnecessary .
【００１４】上記他の硝化脱窒方法において、脱窒槽内
の液面レベルに応じて、吸引ポンプの作動、停止を制御
することがある。この場合、硝化槽の上方には制御のた
めの機器類を配置する必要がないので、濾過膜ユニット
の膜の交換およびメンテナンスを簡単に行うことができ
る。In the other nitrification and denitrification method described above, the operation and stop of the suction pump may be controlled depending on the liquid level in the denitrification tank. In this case, since it is not necessary to arrange control equipment above the nitrification tank, it is possible to easily replace and maintain the membrane of the filtration membrane unit.
【００１５】上記すべての硝化脱窒方法において、原水
槽内の有機性排水を脱窒槽に送り込む送液ポンプ、およ
び脱窒槽内の有機性排水を硝化槽に送り込む送液ポンプ
として、それぞれ水中ポンプを用いることがある。この
場合、従来のように送液ポンプとして定量ポンプを用い
る場合に比べて、コストが安くなるとともにメンテナン
スが簡単になる。しかも、水中ポンプは槽内に配置され
るので、この発明の方法を実施する装置全体の小型化が
図れる。In all of the above nitrification and denitrification methods, a submersible pump is used as a liquid feed pump for feeding the organic waste water in the raw water tank to the denitrification tank and as a liquid feed pump for feeding the organic waste water in the denitrification tank to the nitrification tank. May be used. In this case, compared with the conventional case where a metering pump is used as the liquid feed pump, the cost is lower and the maintenance is easier. Moreover, since the water pump is disposed within the tank, the method miniaturization of the whole apparatus for carrying out the present invention is <br/> view.
【００１６】また、上記すべての硝化脱窒方法におい
て、堰を備えた計量器を利用することにより、原水槽か
ら脱窒槽、脱窒槽から硝化槽への有機性排水の送り込み
量を一定とすることがある。この場合、従来のように、
コストが高くかつメンテナンスの面倒な定量ポンプを用
いることなく、原水槽から脱窒槽、脱窒槽から硝化槽へ
の有機性排水の送り込み量を一定とすることができる。 Further, in the above all nitrification denitrification method, by utilizing a measuring instrument equipped with a weir, from the raw water tank denitrification tank, to the infeed amount of the organic waste water to the nitrification tank is constant from the denitrification tank There is. In this case, as before,
The amount of organic wastewater sent from the raw water tank to the denitrification tank and from the denitrification tank to the nitrification tank can be made constant without using a high-cost and maintenance-intensive metering pump.
【００１７】さらに、上記すべての硝化脱窒方法におい
て、硝化槽からのオーバーフローにより、有機性排水を
脱窒槽に還流させることがある。この場合、従来のよう
に、有機性排水を脱窒槽および硝化槽間で循環させる循
環ポンプを別途設置する必要はないので、循環ポンプ設
置のためのイニシャルコストおよび循環ポンプのメンテ
ナンスのためのランニングコストが不要になる。Further, in all of the above nitrification and denitrification methods, the organic waste water may be returned to the denitrification tank due to overflow from the nitrification tank. In this case, it is not necessary to separately install a circulation pump that circulates the organic wastewater between the denitrification tank and the nitrification tank as in the conventional case. Therefore, the initial cost for installing the circulation pump and the running cost for maintenance of the circulation pump are not required. Becomes unnecessary.
【００１８】[0018]
【発明の実施の形態】以下、この発明の実施の形態を、
図面を参照して説明する。なお、全図面を通じて同一物
および同一部分には同一符号を付して重複する説明を省
略する。BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below.
A description will be given with reference to the drawings. Throughout the drawings, the same components and parts will be denoted by the same reference symbols, without redundant description.
【００１９】図１は、この発明による第１の硝化脱窒方
法を実施する装置を示す。FIG. 1 shows an apparatus for carrying out the first nitrification denitrification method according to the present invention.
【００２０】図１において、この硝化脱窒装置は、原水
槽(1)、嫌気条件下にある脱窒槽(2)、および好気条件下
にある硝化槽(3)を備えている。脱窒槽(2)内には脱窒菌
汚泥が分散させられたサスペンションが入れられ、硝化
槽(3)内には硝化菌汚泥が分散させられたサスペンショ
ンが入れられている。In FIG. 1, this nitrification denitrification apparatus comprises a raw water tank (1), a denitrification tank (2) under anaerobic conditions, and a nitrification tank (3) under aerobic conditions. The denitrification tank (2) contains a suspension in which the denitrifying bacteria sludge is dispersed, and the nitrification tank (3) contains a suspension in which the nitrifying bacteria sludge is dispersed.
【００２１】原水槽(1)内および脱窒槽(2)内にそれぞれ
水中ポンプ(4)(5)が配置されている。また、脱窒槽(2)
の上方および硝化槽(3)の上方にはそれぞれ直角三角堰
(6)(7)を備えた計量器(8)(9)が配置されている。そし
て、槽(1)(2)内の有機性排水は、それぞれ水中ポンプ
(4)(5)により計量器(8)(9)に送られ、直角三角堰(6)(7)
の働きにより、一定流量ずつ槽(2)(3)内に供給されるよ
うになっている。直角三角堰(6)(7)の堰板は上下にスラ
イド自在であり、これにより槽(2)(3)内への供給量を変
えることができる。なお、計量器(8)(9)には、直角三角
堰(6)(7)に代えて他の堰を備えさせておいてもよい。Submersible pumps (4) and (5) are arranged in the raw water tank (1) and the denitrification tank (2), respectively. Also, denitrification tank (2)
The right-angled triangular weirs above the nitrification tank and above the nitrification tank (3), respectively.
Scales (8) and (9) equipped with (6) and (7) are arranged. Then, the organic wastewater in the tanks (1) and (2) is respectively pumped by a submersible pump.
(4) (5) sent to the measuring instrument (8) (9), right angle triangular weir (6) (7)
By the action of, the constant flow rate is supplied into the tanks (2) and (3). The weir plates of the right-angled triangular weirs (6) and (7) are slidable up and down, so that the supply amount into the tanks (2) and (3) can be changed. The weighing devices (8) and (9) may be provided with other weirs instead of the right-angled triangular weirs (6) and (7).
【００２２】脱窒槽(2)内の水中ポンプ(5)から硝化槽
(3)の上方の計量器(9)へ至る導管(10)はその途中で複数
に分岐させられており、各分岐部(10a)の先端が脱窒槽
(2)内の底部に開口させられ、脱窒槽(2)から硝化槽(3)
の計量器(9)へ送り込まれる有機性排水の一部が脱窒槽
(2)内の有機性排水中に吹出されるようになっている。From the submersible pump (5) in the denitrification tank (2) to the nitrification tank
The conduit (10) leading to the measuring instrument (9) above (3) is branched into multiple parts along the way, and the tip of each branch part (10a) is a denitrification tank.
Opened at the bottom of (2), from denitrification tank (2) to nitrification tank (3)
Part of the organic waste water sent to the measuring instrument (9) of the denitrification tank
It is designed to be blown into the organic wastewater in (2).
【００２３】硝化槽(3)のサスペンション中に濾過膜ユ
ニット(11)が浸漬されている。図示は省略したが、濾過
膜ユニット(11)は、複数の中空状平膜モジュールを備え
ている。各平膜モジュールは、対向状に配置された２枚
の平膜と、両平膜の周縁部間に配置された額縁状スペー
サとよりなる。各平膜モジュールに、その中空部内と連
通するように吸引管が接続され、すべての吸引管が１つ
の吸引ポンプ(12)に接続されている。なお、濾過膜ユニ
ット(11)には、平膜を用いた平膜モジュールに代えて、
中空糸状膜を用いたキャピラリーモジュールを適用する
こともできる。The filtration membrane unit (11) is immersed in the suspension of the nitrification tank (3). Although not shown, the filtration membrane unit (11) includes a plurality of hollow flat membrane modules. Each flat sheet membrane module is composed of two flat sheet membranes that are arranged to face each other and a frame-shaped spacer that is placed between the peripheral portions of both flat sheet membranes. A suction pipe is connected to each flat membrane module so as to communicate with the inside of the hollow portion, and all the suction pipes are connected to one suction pump (12). Incidentally, in the filtration membrane unit (11), instead of a flat membrane module using a flat membrane,
It is also possible to apply a capillary module using a hollow fiber membrane.
【００２４】硝化槽(3)内における濾過膜ユニット(11)
よりも下方の部分に曝気装置(13)が配置されている。曝
気装置(13)にはブロワ(14)により空気が送り込まれるよ
うになっている。Filtration membrane unit (11) in the nitrification tank (3)
An aeration device (13) is arranged in a lower portion than the above. Air is sent to the aeration device (13) by a blower (14).
【００２５】また、硝化槽(3)の下部は、下方に向かっ
て細くなったホッパ状となされるとともにその下端に開
口(15)が形成され、この開口(15)が図示しない適当な手
段により開閉自在となされている。硝化槽(3)のホッパ
状部(3a)の下端開口(15)に汚泥排出流路(16)が接続さ
れ、ホッパ状部(3a)の下端開口(15)から排出された汚泥
は、汚泥排出流路(16)を通って汚泥貯槽(17)に送られ
る。The lower part of the nitrification tank (3) is shaped like a hopper that narrows downward, and an opening (15) is formed at the lower end thereof, and this opening (15) is formed by an appropriate means (not shown). It can be opened and closed freely. The sludge discharge flow path (16) is connected to the lower end opening (15) of the hopper-shaped part (3a) of the nitrification tank (3), and the sludge discharged from the lower end opening (15) of the hopper-shaped part (3a) is sludge. It is sent to the sludge storage tank (17) through the discharge flow path (16).
【００２６】原水槽(1)は、槽(1)内の有機性排水の液面
レベルが所定レベル(L1)まで下がった場合に水中ポンプ
(4)および吸引ポンプ(12)を停止させる制御装置(18)を
備えている。脱窒槽(2)は、槽(2)内の液面レベルが所定
の低レベル(L2)まで下がった場合に吸引ポンプ(12)を停
止させるとともに所定の高レベル(L3)に達した場合に吸
引ポンプ(12)を作動させる制御装置(19)を備えている。
硝化槽(3)は、槽(3)内の有機性排水のｐＨを検出し、こ
のｐＨが所定範囲外にある場合に、ｐＨ調製剤タンク(2
0)からポンプ(21)によりｐＨ調製剤を槽(3)内に送り込
み、これにより槽(3)内の有機性排水のｐＨを所定範囲
内に保つｐＨ調整装置(22)を備えている。The raw water tank (1) is a submersible pump when the liquid level of the organic waste water in the tank (1) drops to a predetermined level (L1).
A control device (18) for stopping the (4) and the suction pump (12) is provided. The denitrification tank (2) stops the suction pump (12) when the liquid level in the tank (2) drops to a predetermined low level (L2) and when it reaches a predetermined high level (L3). A control device (19) for operating the suction pump (12) is provided.
The nitrification tank (3) detects the pH of the organic waste water in the tank (3), and when this pH is outside the predetermined range, the pH adjusting tank (2
A pH adjuster (22) is provided to feed the pH adjusting agent into the tank (3) from the pump (21) and to keep the pH of the organic waste water in the tank (3) within a predetermined range.
【００２７】次に、上記装置を用いた第１の硝化脱窒方
法について説明する。Next, the first nitrification denitrification method using the above apparatus will be described.
【００２８】まず、原水槽(1)内の下水、産業排水、し
尿等の有機性排水を、水中ポンプ(4)により計量器(8)を
経て一定流量となるように脱窒槽(2)内に送り込む。こ
のとき、計量器(8)により流量調整が行われ、余分な有
機性排水は計量器(8)からオーバーフローして原水槽(1)
に戻される。ついで、脱窒槽(2)内に送り込まれた有機
性排水を、水中ポンプ(5)により計量器(9)を経て一定流
量となるように硝化槽(3)内に送り込む。このとき、計
量器(9)により流量調整が行われ、余分な有機性排水は
計量器(9)からオーバーフローして脱窒槽(2)に戻され
る。また、有機性排水の一部は、各分岐部(10a)の先端
から脱窒槽(2)内の底部に吹出され、槽(2)内の有機性排
水が攪拌されて汚泥が槽(2)全体にほぼ均一に分散す
る。硝化槽(3)では、曝気装置(13)により有機性排水中
に曝気されることによって、汚泥が槽(3)全体にほぼ均
一に分散する。硝化槽(3)内の有機性排水はオーバーフ
ローして脱窒槽(2)に戻る。このように有機性排水が脱
窒槽(2)と硝化槽(3)との間で循環することにより、有機
性排水中に含まれるアンモニア態窒素を生物学的硝化お
よび脱窒反応を用いて窒素ガスに還元して除去し、さら
に吸引ポンプ(12)を用いて、硝化槽(3)内の排水中に浸
漬された濾過膜ユニット(11)により汚泥と処理水とを分
離する。First, the sewage in the raw water tank (1), industrial waste water, organic waste water such as human waste is put in the denitrification tank (2) by the submersible pump (4) through the measuring device (8) so as to have a constant flow rate. Send to. At this time, the flow rate is adjusted by the measuring instrument (8), and the excess organic waste water overflows from the measuring instrument (8) and flows into the raw water tank (1).
Returned to. Then, the organic waste water sent into the denitrification tank (2) is sent into the nitrification tank (3) through the meter (9) by the submersible pump (5) so as to have a constant flow rate. At this time, the flow rate is adjusted by the measuring instrument (9), and the excess organic waste water overflows from the measuring instrument (9) and is returned to the denitrification tank (2). In addition, part of the organic wastewater is blown out from the tip of each branch (10a) to the bottom of the denitrification tank (2), and the organic wastewater in the tank (2) is agitated to generate sludge (2). Disperse almost uniformly throughout. In the nitrification tank (3), the aeration device (13) aerates the organic waste water to disperse the sludge almost uniformly throughout the tank (3). The organic waste water in the nitrification tank (3) overflows and returns to the denitrification tank (2). By circulating the organic wastewater between the denitrification tank (2) and the nitrification tank (3) in this way, the ammonia nitrogen contained in the organic wastewater is converted into nitrogen by biological nitrification and denitrification reactions. The sludge is reduced to gas and removed, and further, using a suction pump (12), sludge and treated water are separated by a filtration membrane unit (11) immersed in the waste water in the nitrification tank (3).
【００２９】原水槽(1)内の有機性排水の液面レベルが
所定レベル(L1)まで下がると、制御装置(18)は水中ポン
プ(4)および吸引ポンプ(12)の運転を停止させる。ま
た、脱窒槽(2)内の有機性排水の液面レベルが所定の低
レベル(L2)まで下がると、制御装置(19)は吸引ポンプ(1
2)の運転を停止させる。水中ポンプ(4)および吸引ポン
プ(12)の両者の運転が停止した状態、あるいは吸引ポン
プ(12)のみの運転が停止した状態であっても、脱窒槽
(2)内の水中ポンプ(5)は作動しており、この間にも、脱
窒槽(2)内の有機性排水が攪拌されるとともに、有機性
排水が脱窒槽(2)と硝化槽(3)との間で循環させられるこ
とにより、有機性排水中に含まれるアンモニア態窒素が
生物学的硝化および脱窒反応を用いて窒素ガスに還元し
て除去される。そして、脱窒槽(2)内の有機性排水の液
面レベルが所定の高レベル(L3)まで上がると、制御装置
(19)は吸引ポンプ(12)を再度作動させ、硝化槽(3)内の
排水中に浸漬された濾過膜ユニット(11)により汚泥と処
理水とが分離される。ここで、制御装置(19)により制御
される吸引ポンプ(12)の運転時間と停止時間との比は、
高レベル(L3)と低レベル(L2)との差、吸引流量、および
膜の透過流束等により決定されるが、上記比は１：１で
あることが好ましい。しかしながら、これに限定される
ものではない。When the liquid level of the organic waste water in the raw water tank (1) drops to a predetermined level (L1), the control device (18) stops the operation of the submersible pump (4) and the suction pump (12). Further, when the liquid level of the organic waste water in the denitrification tank (2) drops to a predetermined low level (L2), the control device (19) causes the suction pump (1
2) Stop the operation. Even if both the submersible pump (4) and the suction pump (12) are stopped, or only the suction pump (12) is stopped, the denitrification tank
The submersible pump (5) in (2) is operating, and during this time, the organic waste water in the denitrification tank (2) is agitated and the organic waste water is denitrified in the denitrification tank (2) and the nitrification tank (3). ) And ammonia nitrogen contained in the organic waste water are reduced to nitrogen gas by biological nitrification and denitrification reactions and removed. Then, when the liquid level of the organic wastewater in the denitrification tank (2) rises to a predetermined high level (L3), the control device
In (19), the suction pump (12) is operated again, and sludge and treated water are separated by the filtration membrane unit (11) immersed in the waste water in the nitrification tank (3). Here, the ratio between the operation time and the stop time of the suction pump (12) controlled by the control device (19) is
The ratio is preferably 1: 1 although it is determined by the difference between the high level (L3) and the low level (L2), the suction flow rate, the permeation flux of the membrane, and the like. However, it is not limited to this.
【００３０】図２はこの発明による第２の硝化脱窒方法
を実施する装置を示す。FIG. 2 shows an apparatus for carrying out the second nitrification denitrification method according to the present invention.
【００３１】図２において、原水槽(1)は、槽(1)内の有
機性排水の液面レベルが所定レベル(L1)まで下がった場
合に水中ポンプ(4)を停止させる制御装置(30)を備えて
いる。脱窒槽(2)の制御装置(19)は、水中ポンプ(5)が作
動している場合にのみ吸引ポンプ(12)を作動できる状態
にしている。その他の構成は、図１に示す装置と同じで
ある。In FIG. 2, the raw water tank (1) is a control device (30) for stopping the submersible pump (4) when the liquid level of the organic waste water in the tank (1) drops to a predetermined level (L1). ) Is provided. The denitrification tank (2) control device (19) makes the suction pump (12) operable only when the submersible pump (5) is activated. Other configurations are the same as those of the device shown in FIG.
【００３２】次に、上記装置を用いた第２の硝化脱窒方
法について説明する。Next, a second nitrification denitrification method using the above apparatus will be described.
【００３３】通常の状態での硝化脱窒方法は、上記第１
の方法の場合と同様である。The nitrifying denitrification method in the normal state is the same as the first method described above.
The method is the same as that of.
【００３４】原水槽(1)内の有機性排水の液面レベルが
所定レベル(L1)まで下がると、制御装置(30)は水中ポン
プ(4)の運転を停止させる。また、脱窒槽(2)内の有機性
排水の液面レベルが所定の低レベル(L2)まで下がると、
制御装置(19)は吸引ポンプ(12)の運転を停止させる。水
中ポンプ(4)の両者の運転が停止した状態、あるいは吸
引ポンプ(12)の運転が停止した状態であっても、脱窒槽
(2)内の水中ポンプ(5)は作動しており、この間にも、脱
窒槽(2)内の有機性排水が攪拌されるとともに、有機性
排水が脱窒槽(2)と硝化槽(3)との間で循環させられるこ
とにより、有機性排水中に含まれるアンモニア態窒素が
生物学的硝化および脱窒反応を用いて窒素ガスに還元し
て除去される。そして、脱窒槽(2)内の有機性排水の液
面レベルが所定の高レベル(L3)まで上がると、制御装置
(19)は吸引ポンプ(12)を再度作動させ、硝化槽(3)内の
排水中に浸漬された濾過膜ユニット(11)により汚泥と処
理水とが分離される。この方法の場合も、制御装置(19)
により制御される吸引ポンプ(12)の運転時間と停止時間
との比は、高レベル(L3)と低レベル(L2)との差、吸引流
量、および膜の透過流束等により決定されるが、上記比
は１：１であることが好ましい。しかしながら、これに
限定されるものではない。When the liquid level of the organic waste water in the raw water tank (1) drops to a predetermined level (L1), the control device (30) stops the operation of the submersible pump (4). Also, when the liquid level of the organic wastewater in the denitrification tank (2) drops to a predetermined low level (L2),
The control device (19) stops the operation of the suction pump (12). A denitrification tank even when both the submersible pump (4) are stopped or the suction pump (12) is stopped.
The submersible pump (5) in (2) is operating, and during this time, the organic wastewater in the denitrification tank (2) is agitated and the organic wastewater is denitrified (2) and the nitrification tank (3). ) And ammonia nitrogen contained in the organic waste water are reduced to nitrogen gas by biological nitrification and denitrification reactions and removed. Then, when the liquid level of the organic wastewater in the denitrification tank (2) rises to a predetermined high level (L3), the control device
In (19), the suction pump (12) is operated again, and sludge and treated water are separated by the filtration membrane unit (11) immersed in the waste water in the nitrification tank (3). Also in this method, the control device (19)
The ratio between the operating time and the stop time of the suction pump (12) controlled by is determined by the difference between the high level (L3) and the low level (L2), the suction flow rate, the permeation flux of the membrane, etc. It is preferable that the ratio is 1: 1. However, it is not limited to this.
【図１】この発明による第１の硝化脱窒方法を実施する
装置を示す構成図である。FIG. 1 is a configuration diagram showing an apparatus for carrying out a first nitrification denitrification method according to the present invention.
【図２】この発明による第２の硝化脱窒方法を実施する
装置を示す構成図である。FIG. 2 is a configuration diagram showing an apparatus for carrying out a second nitrification denitrification method according to the present invention.
(1) 原水槽 (2) 脱窒槽 (3) 硝化槽 (4)(5) 水中ポンプ(10) 導管 (10a) 分岐部 (11) 濾過膜ユニット (12) 吸引ポンプ(1) Raw water tank (2) Denitrification tank (3) Nitrification tank (4) (5) Submersible pump (10) Conduit (10a) Branch (11) Filtration membrane unit (12) Suction pump
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平８−276196（ＪＰ，Ａ) 特開 平９−94589（ＪＰ，Ａ) 特開 平７−328680（ＪＰ，Ａ) 特開 平７−256282（ＪＰ，Ａ) 特開 平７−256294（ＪＰ，Ａ) 実開 平４−118199（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.7，ＤＢ名) C02F 3/28 - 3/34 ─────────────────────────────────────────────────── ─── Continued Front Page (56) References JP-A-8-276196 (JP, A) JP-A-9-94589 (JP, A) JP-A-7-328680 (JP, A) JP-A-7- 256282 (JP, A) JP 7-256294 (JP, A) Actual development 4-118199 (JP, U) (58) Fields investigated (Int.Cl. 7 , DB name) C02F 3/28-3 / 34
Claims (7)
より脱窒槽および硝化槽に順々に送り込むとともに両槽
間で循環させることにより、有機性排水中に含まれるア
ンモニア態窒素を生物学的硝化および脱窒反応を用いて
窒素ガスに還元して除去し、さらに吸引ポンプを用い
て、硝化槽内の排水中に浸漬された濾過膜ユニットによ
り汚泥と処理水とを分離する硝化脱窒方法であって、 原水槽から脱窒槽に有機性排水を送り込む送液ポンプが
作動している場合にのみ吸引ポンプを作動させるように
し、さらに有機性排水を送液ポンプにより脱窒槽から硝
化槽へ送る導管を途中で分岐させ、分岐部の先端を脱窒
槽内に開口させ、脱窒槽から硝化槽へ送り込まれる有機
性排水の一部を脱窒槽内の有機性排水中に吹出させるこ
とを特徴とする硝化脱窒方法。1. The organic wastewater in the raw water tank is sequentially sent to a denitrification tank and a nitrification tank by a liquid feed pump, and is circulated between the two tanks so that the ammonia nitrogen contained in the organic wastewater is converted into a living organism. Using a biological nitrification and denitrification reaction to reduce the nitrogen gas, and then a suction pump is used to separate the sludge from the treated water by a filtration membrane unit immersed in the wastewater in the nitrification tank. a窒方method, as liquid feed pump for feeding the organic waste water from the raw water tank to the denitrification tank actuates only the suction pump when operating
In addition, the organic waste water is removed from the denitrification tank by a liquid delivery pump.
Branch the conduit to the chemical tank halfway and denitrify the tip of the branch part.
Organic that is opened in the tank and sent from the denitrification tank to the nitrification tank
A nitrification denitrification method, characterized in that a part of the organic waste water is blown into the organic waste water in the denitrification tank.
ンプの作動、停止を制御することを特徴とする請求項１
記載の硝化脱窒方法。2. The operation of the suction pump is controlled according to the liquid level in the raw water tank.
The described nitrification denitrification method.
より脱窒槽および硝化槽に順々に送り込むとともに両槽
間で循環させることにより、有機性排水中に含まれるア
ンモニア態窒素を生物学的硝化および脱窒反応を用いて
窒素ガスに還元して除去し、さらに吸引ポンプを用い
て、硝化槽内の排水中に浸漬された濾過膜ユニットによ
り汚泥と処理水とを分離する硝化脱窒方法であって、 脱窒槽から硝化槽に有機性排水を送り込む送液ポンプが
作動している場合にのみ吸引ポンプを作動させるように
し、さらに有機性排水を送液ポンプにより脱窒槽から硝
化槽へ送る導管を途中で分岐させ、分岐部の先端を脱窒
槽内に開口させ、脱窒槽から硝化槽へ送り込まれる有機
性排水の一部を脱窒槽内の有機性排水中に吹出させるこ
とを特徴とする硝化脱窒方法。3. Ammonia nitrogen contained in the organic wastewater is produced by feeding organic wastewater in the raw water tank to a denitrification tank and a nitrification tank by a liquid feed pump in order and circulating the same between the two tanks. Using a biological nitrification and denitrification reaction to reduce the nitrogen gas, and then a suction pump is used to separate the sludge from the treated water by a filtration membrane unit immersed in the wastewater in the nitrification tank. a窒方method, as liquid feed pump for feeding the organic wastewater in the nitrification tank from denitrification actuates only the suction pump when operating
In addition, the organic waste water is removed from the denitrification tank by a liquid delivery pump.
Branch the conduit to the chemical tank halfway and denitrify the tip of the branch part.
Organic that is opened in the tank and sent from the denitrification tank to the nitrification tank
A nitrification denitrification method, characterized in that a part of the organic waste water is blown into the organic waste water in the denitrification tank.
ンプの作動、停止を制御することを特徴とする請求項３
記載の硝化脱窒方法。4. The operation and stop of the suction pump are controlled according to the liquid level in the denitrification tank.
The described nitrification denitrification method.
む送液ポンプ、および脱窒槽内の有機性排水を硝化槽に
送り込む送液ポンプとして、それぞれ水中ポンプを用い
ることを特徴とする請求項１〜４のうちのいずれかに記
載の硝化脱窒方法。5. A submersible pump is used as each of a liquid feed pump for feeding the organic waste water in the raw water tank to the denitrification tank and a liquid feed pump for feeding the organic waste water in the denitrification tank to the nitrification tank. Item 5. The nitrification denitrification method according to any one of Items 1 to 4.
り、原水槽から脱窒槽、脱窒槽から硝化槽への有機性排
水の送り込み量を一定とすることを特徴とする請求項１
〜５のうちのいずれかに記載の硝化脱窒方法。6. By using a weighing machine equipped with a weir
From the raw water tank to the denitrification tank and from the denitrification tank to the nitrification tank.
2. A constant amount of water sent in.
5. The nitrification denitrification method according to any one of 5 to 10.
機性排水を脱窒槽に還流させることを特徴とする請求項
１〜６のうちのいずれかに記載の硝化脱窒方法。7. Due to overflow from the nitrification tank,
The nitrification denitrification method according to any one of claims 1 to 6, wherein the mechanical wastewater is returned to the denitrification tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25430796A JP3467671B2 (en) | 1996-07-23 | 1996-09-26 | Nitrification denitrification method |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8-193018 | 1996-07-23 | ||
| JP19301896 | 1996-07-23 | ||
| JP25430796A JP3467671B2 (en) | 1996-07-23 | 1996-09-26 | Nitrification denitrification method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH1085788A JPH1085788A (en) | 1998-04-07 |
| JP3467671B2 true JP3467671B2 (en) | 2003-11-17 |
Family
ID=26507652
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25430796A Expired - Fee Related JP3467671B2 (en) | 1996-07-23 | 1996-09-26 | Nitrification denitrification method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3467671B2 (en) |
Cited By (8)
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| EP1695942A2 (en) | 2005-02-28 | 2006-08-30 | Sharp Kabushiki Kaisha | Wastewater treatment device and wastewater treatment method |
| US7485232B2 (en) | 2005-11-22 | 2009-02-03 | Sharp Kabushiki Kaisha | Water treatment method and water treatment apparatus |
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| US7578942B2 (en) | 2005-03-03 | 2009-08-25 | Sharp Kabushiki Kaisha | Wastewater treatment equipment and method of wastewater treatment |
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| US7641802B2 (en) | 2005-03-04 | 2010-01-05 | Sharp Kabushiki Kaisha | Wastewater treatment method and wastewater treatment equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR100400358B1 (en) * | 2002-10-28 | 2003-10-08 | 주식회사 진우환경기술연구소 | Intermittent operating phase submerged membrane bioreactor waste water treatment system |
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- 1996-09-26 JP JP25430796A patent/JP3467671B2/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1695942A2 (en) | 2005-02-28 | 2006-08-30 | Sharp Kabushiki Kaisha | Wastewater treatment device and wastewater treatment method |
| US7329341B2 (en) | 2005-02-28 | 2008-02-12 | Sharp Kabushiki Kaisha | Wastewater treatment device |
| US7578942B2 (en) | 2005-03-03 | 2009-08-25 | Sharp Kabushiki Kaisha | Wastewater treatment equipment and method of wastewater treatment |
| US7641802B2 (en) | 2005-03-04 | 2010-01-05 | Sharp Kabushiki Kaisha | Wastewater treatment method and wastewater treatment equipment |
| US7691268B2 (en) | 2005-03-04 | 2010-04-06 | Sharp Kabushiki Kaisha | Waste gas/wastewater treatment equipment and method of treating waste gas/wastewater |
| US7625484B2 (en) | 2005-09-16 | 2009-12-01 | Sharp Kabuhsiki Kaisha | Water treatment apparatus |
| US7485232B2 (en) | 2005-11-22 | 2009-02-03 | Sharp Kabushiki Kaisha | Water treatment method and water treatment apparatus |
| US7575684B2 (en) | 2005-12-16 | 2009-08-18 | Sharp Kabushiki Kaisha | Waste water treatment apparatus and waste water treatment method |
| US7713410B2 (en) | 2005-12-20 | 2010-05-11 | Sharp Kabuhsiki Kaisha | Wastewater treatment apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH1085788A (en) | 1998-04-07 |
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