JPH11216485A - Flocculant addition control method in activated sludge process - Google Patents
Flocculant addition control method in activated sludge processInfo
- Publication number
- JPH11216485A JPH11216485A JP10036746A JP3674698A JPH11216485A JP H11216485 A JPH11216485 A JP H11216485A JP 10036746 A JP10036746 A JP 10036746A JP 3674698 A JP3674698 A JP 3674698A JP H11216485 A JPH11216485 A JP H11216485A
- Authority
- JP
- Japan
- Prior art keywords
- sewage
- flocculant
- pump
- activated sludge
- injection 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.)
- Granted
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Landscapes
- Activated Sludge Processes (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、活性汚泥法におけ
る凝集剤添加制御方法に関し、特に、汚水に凝集剤を添
加し、汚水中のリンを除去する活性汚泥法における凝集
剤添加制御方法に関するものである。The present invention relates to a method for controlling the addition of a flocculant in an activated sludge method, and more particularly to a method for controlling the addition of a flocculant in an activated sludge method in which a flocculant is added to sewage and phosphorus in the sewage is removed. It is.
【０００２】[0002]
【従来の技術】従来、下水処理場に流入する汚水を処理
するために、処理槽内の活性汚泥に汚水に導入し、これ
を曝気、攪拌して生物処理を行う活性汚泥法が汎用され
ている。2. Description of the Related Art Conventionally, in order to treat sewage flowing into a sewage treatment plant, an activated sludge method in which sewage is introduced into activated sludge in a treatment tank and aerated and stirred to perform biological treatment has been widely used. I have.
【０００３】ところで、下水処理場に流入する汚水に含
まれるリンの量は、下水処理場によって、また、天候や
流入時間帯によってかなり差がある。このリンの除去を
効率的に、かつ適正に行うために、従来より、汚水に凝
集剤を添加し、リンを汚泥と共に沈殿させて除去する方
法が採用されている。この凝集剤添加量の決定に際して
は、各々の下水処理場におけるリンの流入負荷の変動特
性を充分考慮しなければならないが、従来の活性汚泥法
においては、凝集剤添加量を決定するために、定量方
式、流量比例方式、負荷量比例方式等が採用されて
いた。[0003] The amount of phosphorus contained in sewage flowing into a sewage treatment plant varies considerably depending on the sewage treatment plant, and depending on the weather and the time of inflow. In order to efficiently and properly remove phosphorus, a method of adding a coagulant to wastewater and precipitating phosphorus together with sludge to remove phosphorus has been adopted. In determining the coagulant addition amount, it is necessary to sufficiently consider the fluctuation characteristics of the inflow load of phosphorus in each sewage treatment plant, but in the conventional activated sludge method, in order to determine the coagulant addition amount, A quantitative system, a flow proportional system, a load proportional system, etc. were adopted.
【０００４】[0004]
【発明が解決しようとする課題】上記従来の活性汚泥法
における凝集剤添加制御方法は、以下の長所及び短所を
有する。 定量方式 最も簡易な方法であるが、負荷変動に追従できないた
め、性能が安定しにくい。 流量比例方式 の定量方式との負荷量比例方式の折衷法であるが、
降雨などにより、リンの濃度が変動しなければ、効果
的、かつ簡易な制御方法であるが、リンの濃度の変動に
対して追従して制御できない。 負荷量比例方式 最も適正な制御が可能であるが、制御が複雑であり維持
管理が容易でない。The conventional method for controlling the addition of a flocculant in the conventional activated sludge method has the following advantages and disadvantages. Quantitative method This is the simplest method, but its performance is difficult to stabilize because it cannot follow load fluctuations. It is a compromise between the flow proportional method and the load proportional method.
If the phosphorus concentration does not fluctuate due to rainfall or the like, it is an effective and simple control method, but it cannot be controlled to follow the fluctuation in the phosphorus concentration. Load proportional method The most appropriate control is possible, but the control is complicated and maintenance is not easy.
【０００５】上記従来の活性汚泥法における凝集剤添加
制御方法の有する問題点は、住民の生活パターンが類似
し、１日当たりの流入汚水量の時間変動が大きく、さら
に、最初沈殿池や調整槽を設けられていないため、１日
当たりの負荷変動の影響が大きい、小規模な下水処理場
において、特に顕著に現れ、例えば、小規模な下水処理
場において、の定量方式を採用した場合、時間帯によ
って処理水の全リン濃度や溶解性リン濃度が上昇すると
いう問題があった。これに対処するためには、少なくと
も、流量計などを用いて汚水の流入量の測定を行い、汚
水の流入量の変動に対応するようにしたの流量比例方
式を採用する必要があるが、この場合も、流量計や制御
装置を新規に設置したり、これらの機器を維持管理する
必要があり、小規模な下水処理場の場合には、採用する
ことが困難であった。The problems of the conventional method for controlling the addition of a flocculant in the activated sludge method are that the living patterns of the residents are similar, the amount of sewage inflow per day is largely fluctuated, and the first sedimentation basin and regulating tank are not used. Because it is not provided, it is particularly noticeable in small-scale sewage treatment plants where the effect of daily load fluctuations is large. For example, in small-scale sewage treatment plants, when the quantitative method is adopted, depending on the time zone, There was a problem that the total phosphorus concentration and the soluble phosphorus concentration of the treated water increased. In order to cope with this, at least it is necessary to measure the inflow of sewage using a flow meter or the like, and to adopt a flow proportional method that is adapted to the fluctuation of the inflow of sewage. Also in this case, it is necessary to newly install a flow meter and a control device, and to maintain and manage these devices. In the case of a small-scale sewage treatment plant, it has been difficult to adopt the sewage treatment plant.
【０００６】本発明は、上記従来の活性汚泥法における
凝集剤添加制御方法の有する問題点に鑑み、機器の維持
管理が容易な簡易な機構を用いて、汚水の流入量の変動
に追従して汚水に凝集剤を添加することができる活性汚
泥法における凝集剤添加制御方法を提供することを目的
とする。In view of the above-mentioned problems of the conventional method for controlling the addition of a flocculant in the activated sludge method, the present invention uses a simple mechanism that facilitates maintenance and management of equipment, and follows the fluctuation of the inflow of wastewater. It is an object of the present invention to provide a method for controlling the addition of a flocculant in an activated sludge method capable of adding a flocculant to wastewater.
【０００７】[0007]
【課題を解決するための手段】上記目的を達成するた
め、本発明の活性汚泥法における凝集剤添加制御方法
は、汚水に凝集剤を添加し、汚水中のリンを除去する活
性汚泥法における凝集剤添加制御方法において、汚水ポ
ンプの駆動と凝集剤注入ポンプの駆動を連動させること
を特徴とする。In order to achieve the above object, a method for controlling the addition of a flocculant in an activated sludge method according to the present invention comprises a method of adding a flocculant to wastewater to remove phosphorus in the wastewater. In the agent addition control method, the drive of the sewage pump and the drive of the coagulant injection pump are linked.
【０００８】この活性汚泥法における凝集剤添加制御方
法は、汚水ポンプの駆動と凝集剤注入ポンプの駆動を連
動させることにより、機器の維持管理が容易な簡易な機
構を用いて、汚水の流入量の変動に追従して汚水に凝集
剤を添加することが可能となる。The method for controlling the addition of a flocculant in the activated sludge method uses a simple mechanism that facilitates the maintenance and management of the equipment by interlocking the drive of a sewage pump and the drive of a flocculant injection pump. It becomes possible to add a flocculant to sewage by following the fluctuation of water.
【０００９】あるいは、また、汚水ポンプの起動又は停
止と、凝集剤注入ポンプの起動を連動させ、凝集剤注入
ポンプの停止をタイマーにより行うことができる。Alternatively, the start or stop of the sewage pump and the start of the coagulant injection pump can be linked, and the stop of the coagulant injection pump can be performed by a timer.
【００１０】これにより、タイマーの設定により、凝集
剤の添加量を調整することができる。[0010] Thus, the addition amount of the flocculant can be adjusted by setting the timer.
【００１１】[0011]
【発明の実施の形態】以下、本発明の活性汚泥法におけ
る凝集剤添加制御方法の実施の形態を図面に基づいて説
明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a method for controlling the addition of a flocculant in the activated sludge method of the present invention will be described below with reference to the drawings.
【００１２】図１に、本発明の活性汚泥法における凝集
剤添加制御方法を実施する小規模な下水処理場の一例を
示す。このような小規模な下水処理場には、例えば、完
全混合に近い処理槽３が設置されるが、処理槽３には、
通常、図１のような長円形の形状が多用される。なお、
処理槽の形状は、図示のものに限定されるものではな
く、図示のように長円形をした循環水路とは異なる円
形、馬蹄形、矩形等の循環水路形式のものを用いること
ができる。FIG. 1 shows an example of a small-scale sewage treatment plant for implementing the method for controlling the addition of a flocculant in the activated sludge method of the present invention. In such a small-scale sewage treatment plant, for example, a treatment tank 3 close to complete mixing is installed.
Usually, an oval shape as shown in FIG. 1 is frequently used. In addition,
The shape of the treatment tank is not limited to the illustrated one, and a circular, horseshoe, rectangular, or other circulating water channel type different from the elliptical circulating water channel as illustrated can be used.
【００１３】また、処理槽３には、流入する汚水Ａを曝
気、攪拌するために、スクリュー形の曝気装置６が１台
又は２台以上設けられるが、曝気装置の方式や台数も限
定されるものではなく、循環水路内で汚水がほぼ均一に
流通するようにして設置される。The treatment tank 3 is provided with one or more screw-type aerators 6 for aerating and agitating the inflowing wastewater A, but the type and number of aerators are also limited. Instead, it is installed so that the sewage flows almost uniformly in the circulation channel.
【００１４】ところで、下水処理場に流入した汚水Ａ
は、汚水ポンプ１を備えた汚水槽２から、汚水ポンプ１
を駆動することにより、適宜の前処理装置を経て、ある
いは、前処理装置を経ずに直接、処理槽３内へ導入され
る。また、処理槽３には、凝集剤注入ポンプ４により凝
集剤Ｂの添加を行うようにするが、凝集剤の種類、凝集
剤注入ポンプ４の方式、台数等は限定されるものではな
い。凝集剤Ｂは、汚水に含まれるリンと反応し、リン酸
化合物を生成、凝集する。By the way, the sewage A flowing into the sewage treatment plant
From a sewage tank 2 equipped with a sewage pump 1
Is driven into the processing tank 3 through an appropriate pretreatment device or directly without passing through the pretreatment device. In addition, the coagulant B is added to the treatment tank 3 by the coagulant injection pump 4, but the type of the coagulant, the type and the number of the coagulant injection pumps 4 are not limited. The coagulant B reacts with phosphorus contained in the wastewater to generate and coagulate a phosphate compound.
【００１５】処理槽３には、最終沈殿池５が接続され、
処理槽３において、活性汚泥及び凝集剤を添加して処理
された汚水を、凝集したリン酸化合物と共に最終沈殿池
５へ導入する。この最終沈殿池５にて、凝集したリン酸
化合物は、汚泥と共に沈殿、分離され、一部は返送汚泥
Ｃとして処理槽３に返送され、残りは余剰汚泥Ｄとして
系外へ搬出される。一方、リンが除去され、リン濃度が
低下した処理水Ｅは、上澄水として最終沈殿池５より排
出される。A final settling basin 5 is connected to the treatment tank 3,
In the treatment tank 3, the wastewater treated by adding the activated sludge and the flocculant is introduced into the final sedimentation basin 5 together with the flocculated phosphate compound. In the final sedimentation basin 5, the flocculated phosphoric acid compound is precipitated and separated together with the sludge, a part of which is returned to the treatment tank 3 as returned sludge C, and the rest is carried out as excess sludge D outside the system. On the other hand, the treated water E from which phosphorus has been removed and the phosphorus concentration has been reduced is discharged from the final sedimentation basin 5 as supernatant water.
【００１６】次に、本発明の活性汚泥法における凝集剤
添加制御方法について説明する。図２は、時間経過に伴
う汚水ポンプ１の駆動状態を示したもので、ｔ１，ｔ３
は汚水ポンプ１の起動時刻を、ｔ２，ｔ４は汚水ポンプ
１の停止時刻を示す。本発明の活性汚泥法における凝集
剤添加制御方法においては、汚水ポンプ１の駆動と凝集
剤注入ポンプ４の駆動を連動させるようにしているが、
より具体的には、次の方法を採用することができる。 汚水ポンプ１の駆動と凝集剤注入ポンプ４の駆動を完
全に連動させ、凝集剤注入ポンプ４を、汚水ポンプ１を
駆動しているｔ１〜ｔ２及びｔ３〜ｔ４の間駆動して、
処理槽３に凝集剤Ｂを添加する。 汚水ポンプの起動ｔ１，ｔ３と、凝集剤注入ポンプ４
の起動を連動させ、凝集剤注入ポンプ４を駆動して、処
理槽３に凝集剤Ｂを添加し、タイマー（図示省略）にて
時間Ｔ１後、凝集剤注入ポンプ４を停止する。 汚水ポンプの停止ｔ２，ｔ４と、凝集剤注入ポンプ４
の起動を連動させ、凝集剤注入ポンプ４を駆動して、処
理槽３に凝集剤Ｂを添加し、タイマー（図示省略）にて
時間Ｔ２後、凝集剤注入ポンプ４を停止する。Next, a method for controlling the addition of a flocculant in the activated sludge method of the present invention will be described. FIG. 2 shows the driving state of the sewage pump 1 with the passage of time.
Indicates the start time of the sewage pump 1, and t2 and t4 indicate the stop times of the sewage pump 1. In the coagulant addition control method in the activated sludge method of the present invention, the drive of the sewage pump 1 and the drive of the coagulant injection pump 4 are linked.
More specifically, the following method can be adopted. The drive of the sewage pump 1 and the drive of the coagulant injection pump 4 are completely interlocked, and the coagulant injection pump 4 is driven during t1 to t2 and t3 to t4 driving the sewage pump 1,
The coagulant B is added to the processing tank 3. Starting sewage pump t1, t3 and coagulant injection pump 4
Is activated, the coagulant injection pump 4 is driven, the coagulant B is added to the treatment tank 3, and after a time T1 by a timer (not shown), the coagulant injection pump 4 is stopped. Stop of the sewage pump t2, t4 and the flocculant injection pump 4
The coagulant injection pump 4 is driven, the coagulant injection pump 4 is driven, the coagulant B is added to the treatment tank 3, and after a time T2 by a timer (not shown), the coagulant injection pump 4 is stopped.
【００１７】この場合において、汚水ポンプ１は、汚水
槽２が高水位になると起動し、低水位になると停止する
ように設定する。これにより、汚水ポンプ１の駆動中の
汚水の流入量により多少の誤差は生じるものの、汚水ポ
ンプ１の１回当たりの駆動時間（ｔ２−ｔ１，ｔ４−ｔ
３）は、ほぼ一定であり、この間に処理槽３に流入する
汚水の流入量もほぼ一定である。このため、汚水ポンプ
１の駆動と凝集剤注入ポンプ４の駆動を連動させれば、
汚水の流入量の変動に追従して汚水に凝集剤Ｂを添加す
ることが可能となる。特に、又はのように、汚水ポ
ンプ１の起動ｔ１，ｔ３又は停止ｔ２，ｔ４と、凝集剤
注入ポンプ４の起動を連動させ、凝集剤注入ポンプ４の
停止をタイマーにより行うことにより、タイマーの設定
により、凝集剤Ｂの添加量を調整することができる。In this case, the sewage pump 1 is set to start when the sewage tank 2 has a high water level and stop when the sewage tank 2 has a low water level. Thus, although a slight error may occur depending on the amount of inflow of sewage while the sewage pump 1 is being driven, the drive time per operation of the sewage pump 1 (t2-t1, t4-t)
3) is substantially constant, and the amount of wastewater flowing into the treatment tank 3 during this period is also substantially constant. Therefore, if the drive of the sewage pump 1 and the drive of the coagulant injection pump 4 are linked,
The flocculant B can be added to the sewage following the fluctuation of the inflow of the sewage. Particularly, or as described above, the start t1, t3 or the stop t2, t4 of the sewage pump 1 is linked with the start of the coagulant injection pump 4, and the coagulant injection pump 4 is stopped by the timer, thereby setting the timer. Thus, the amount of the coagulant B added can be adjusted.
【００１８】なお、１日当たりの平均水量と平均リン酸
濃度から計算されるリンの総量に基づいて、凝集剤注入
ポンプ４による凝集剤Ｂの添加量（流量）を調整する必
要がある。例えば、アルミニウム系凝集剤の場合、Ａｌ
（アルミニウム）：Ｐ（リン）のモル比は、１程度が適
切とされるため、凝集剤の有効Ａｌ濃度と１日当たりの
合計添加時間を考慮して、Ａ１：Ｐのモル比がほぼ１と
なるように凝集剤注入ポンプ４による凝集剤Ｂの添加量
（流量）を予め設定しておくものとする。It is necessary to adjust the addition amount (flow rate) of the coagulant B by the coagulant injection pump 4 based on the total amount of phosphorus calculated from the average water amount per day and the average phosphoric acid concentration. For example, in the case of an aluminum-based flocculant, Al
Since the molar ratio of (aluminum): P (phosphorus) is appropriately about 1, the molar ratio of A1: P is approximately 1 in consideration of the effective Al concentration of the coagulant and the total addition time per day. The addition amount (flow rate) of the coagulant B by the coagulant injection pump 4 is set in advance so as to be as follows.
【００１９】[0019]
【発明の効果】本発明の活性汚泥法における凝集剤添加
制御方法によれば、汚水ポンプの駆動と凝集剤注入ポン
プの駆動を連動させることにより、機器の維持管理が容
易な簡易な機構を用いて、汚水の流入量の変動に追従し
て汚水に凝集剤を添加することが可能となり、特に、小
規模な下水処理場において、リンが除去され、リン濃度
が低下した処理水を、コストをかけることなく、容易
に、かつ、安定して得ることができる。According to the method for controlling the addition of a flocculant in the activated sludge method of the present invention, the operation of the sewage pump and the drive of the coagulant injection pump are linked to use a simple mechanism that facilitates maintenance and management of the equipment. Therefore, it is possible to add a flocculant to sewage following the fluctuation of the inflow of sewage, and in particular, in a small-scale sewage treatment plant, to reduce the cost of treated water from which phosphorus has been removed and the concentration of phosphorus has been reduced. It can be obtained easily and stably without applying.
【００２０】あるいは、また、汚水ポンプの起動又は停
止と、凝集剤注入ポンプの起動を連動させ、凝集剤注入
ポンプの停止をタイマーにより行うことにより、タイマ
ーの設定により、凝集剤の添加量を容易に調整すること
ができる。Alternatively, the start or stop of the sewage pump and the start of the coagulant injection pump are linked to each other, and the coagulant injection pump is stopped by a timer. Can be adjusted.
【図１】本発明の活性汚泥法における凝集剤添加制御方
法を実施する小規模な下水処理場の一例を示す説明図で
ある。FIG. 1 is an explanatory diagram showing an example of a small-scale sewage treatment plant that implements a method for controlling the addition of a flocculant in the activated sludge method of the present invention.
【図２】本発明の活性汚泥法における凝集剤添加制御方
法を示す説明図である。FIG. 2 is an explanatory view showing a method for controlling the addition of a flocculant in the activated sludge method of the present invention.
１ 汚水ポンプ ２ 汚水槽 ３ 処理槽 ４ 凝集剤注入ポンプ ５ 最終沈殿池 ６ 曝気装置 Ａ 汚水 Ｂ 凝集剤 Ｃ 余剰汚泥 Ｄ 返送汚泥 Ｅ 処理水 Reference Signs List 1 sewage pump 2 sewage tank 3 treatment tank 4 coagulant injection pump 5 final sedimentation basin 6 aeration device A sewage B coagulant C excess sludge D returned sludge E treated water
Claims (2)
除去する活性汚泥法における凝集剤添加制御方法におい
て、汚水ポンプの駆動と凝集剤注入ポンプの駆動を連動
させることを特徴とする活性汚泥法における凝集剤添加
制御方法。1. A method for controlling the addition of a flocculant in an activated sludge method in which a flocculant is added to sewage and phosphorus in the sewage is removed, wherein a drive of a sewage pump and a drive of a coagulant injection pump are linked. Coagulant addition control method in activated sludge method.
入ポンプの起動を連動させ、凝集剤注入ポンプの停止を
タイマーにより行うことを特徴とする請求項１記載の活
性汚泥法における凝集剤添加制御方法。2. The addition of a flocculant in the activated sludge method according to claim 1, wherein the start or stop of the sewage pump and the start of the flocculant injection pump are linked, and the stop of the flocculant injection pump is performed by a timer. Control method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP03674698A JP4017730B2 (en) | 1998-02-03 | 1998-02-03 | Coagulant addition control method in activated sludge process. |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP03674698A JP4017730B2 (en) | 1998-02-03 | 1998-02-03 | Coagulant addition control method in activated sludge process. |
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| Publication Number | Publication Date |
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| JPH11216485A true JPH11216485A (en) | 1999-08-10 |
| JP4017730B2 JP4017730B2 (en) | 2007-12-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| JP03674698A Expired - Fee Related JP4017730B2 (en) | 1998-02-03 | 1998-02-03 | Coagulant addition control method in activated sludge process. |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009004123A1 (en) * | 2007-07-05 | 2009-01-08 | Biolan Oy | Apparatus and method for precipitation of phosphorus from waste water |
| US20140370390A1 (en) * | 2012-03-13 | 2014-12-18 | L&F Material Co., Ltd. | Method for preparing positive electrode active material for lithium secondary battery, positive electrode active material for lithium secondary battery, and lithium secondary battery including same |
| JP2018083138A (en) * | 2016-11-21 | 2018-05-31 | 清水建設株式会社 | Processing system of metal-containing waste water |
-
1998
- 1998-02-03 JP JP03674698A patent/JP4017730B2/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009004123A1 (en) * | 2007-07-05 | 2009-01-08 | Biolan Oy | Apparatus and method for precipitation of phosphorus from waste water |
| US20140370390A1 (en) * | 2012-03-13 | 2014-12-18 | L&F Material Co., Ltd. | Method for preparing positive electrode active material for lithium secondary battery, positive electrode active material for lithium secondary battery, and lithium secondary battery including same |
| JP2018083138A (en) * | 2016-11-21 | 2018-05-31 | 清水建設株式会社 | Processing system of metal-containing waste water |
Also Published As
| Publication number | Publication date |
|---|---|
| JP4017730B2 (en) | 2007-12-05 |
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