JP2014198284A - Anaerobic treatment apparatus for organic waste water - Google Patents

Anaerobic treatment apparatus for organic waste water Download PDF

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JP2014198284A
JP2014198284A JP2013074161A JP2013074161A JP2014198284A JP 2014198284 A JP2014198284 A JP 2014198284A JP 2013074161 A JP2013074161 A JP 2013074161A JP 2013074161 A JP2013074161 A JP 2013074161A JP 2014198284 A JP2014198284 A JP 2014198284A
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anaerobic
screen
aeration
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和也 小松
Kazuya Komatsu
和也 小松
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Kurita Water Industries Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide an anaerobic treatment apparatus for organic waste water, which allows a stable anaerobic treatment by preventing slime and scale from adhering to or blocking a screen due to aeration, and can prevent reduction in anaerobic treatment efficiency due to dissolved oxygen in treatment water even when the treatment water is circulated.SOLUTION: The anaerobic treatment apparatus for organic waste water includes a fluid bed-type anaerobic reaction tank having a carrier therein with anaerobic microbes adhered to the carrier for anaerobic treatment of organic waste water, a screen for separating the carrier from the anaerobic treatment water, and an aeration means disposed below the screen for aeration washing of the screen. The actuation of the aeration means is controlled corresponding to the water level of the tank having the screen. Aeration is performed when the water level rises beyond a specified value, and aeration is stopped when the water level falls below a specified value, so that intermittent aeration is performed.

Description

本発明は有機性排水の嫌気処理装置に係り、詳しくは、槽内に担体を保有し、該担体に付着した嫌気性微生物により有機性排水の嫌気性処理を行い、嫌気性処理水と担体とをスクリーンで分離して処理水を取り出すようにした有機性排水の嫌気処理装置に関する。   The present invention relates to an organic wastewater anaerobic treatment apparatus, and more specifically, holds a carrier in a tank, performs anaerobic treatment of organic wastewater with anaerobic microorganisms attached to the carrier, and anaerobic treated water and carrier. It is related with the anaerobic processing apparatus of the organic waste_water | drain which isolate | separated with a screen and took out treated water.

嫌気性処理において反応槽内の微生物濃度を高濃度に保ち、高負荷での処理を可能にするものとして、嫌気性微生物を流動担体に固定化して反応槽内を流動させる流動床方式が知られている(例えば、特許文献1)。流動床方式によれば、排水と接触する嫌気性微生物の濃度が高められ、処理速度が向上する。   In anaerobic treatment, a fluidized bed system is known in which the anaerobic microorganisms are immobilized on a fluidized carrier and flow in the reaction vessel to maintain a high concentration of microorganisms in the reaction vessel and enable high-load treatment. (For example, Patent Document 1). According to the fluidized bed system, the concentration of anaerobic microorganisms that come into contact with the wastewater is increased, and the processing speed is improved.

一方、流動床方式においては、微生物が保持されている担体と処理水とを分離する必要があり、通常、そのために、処理水槽にスクリーンが設けられている(例えば、特許文献2、特許文献3)。この場合、担体によるスクリーンの閉塞を防止するために、スクリーン下部から常時曝気してスクリーンの曝気洗浄が行われている。   On the other hand, in the fluidized bed system, it is necessary to separate the carrier holding the microorganisms and the treated water, and usually a screen is provided in the treated water tank (for example, Patent Document 2 and Patent Document 3). ). In this case, in order to prevent the screen from being blocked by the carrier, the screen is aerated and washed from the bottom of the screen at all times.

特公平2−32038号公報Japanese Patent Publication No. 2-332038 特開平6−246285号公報JP-A-6-246285 特開2000−246274号公報JP 2000-246274 A

嫌気処理での有機物除去率は一般に80〜90%に留まるため、嫌気性処理水中には有機物がまだ残存している。有機物を含む嫌気処理水が流入する処理水槽内で曝気を行うと、処理水槽内が好気条件となり、残存した有機物を基質として好気性微生物(スライム)がスクリーン表面に増殖してしまう。また、曝気により処理水に含まれる炭酸成分が気散し、pHが上昇するため、高pH条件下で生成したスケールもスクリーン表面に付着するようになり、これらの付着物でスクリーンが閉塞してしまうという問題があった。   Since the organic substance removal rate in anaerobic treatment generally remains at 80 to 90%, organic substances still remain in the anaerobic treated water. When aeration is performed in a treated water tank into which anaerobic treated water containing organic matter flows, the treated water tank becomes aerobic, and aerobic microorganisms (slime) grow on the screen surface using the remaining organic matter as a substrate. In addition, the carbonic acid component contained in the treated water is diffused by aeration and the pH rises, so that the scale generated under high pH conditions also adheres to the screen surface, and these deposits block the screen. There was a problem that.

また、嫌気処理では、処理水の一部を原水と混合して嫌気反応槽(嫌気反応槽前段に酸生成槽を設ける場合は酸生成槽)に導入することで、処理水のアルカリ度を使用して酸生成時の中和用アルカリ使用量を削減することができるが、曝気による溶存酸素を含む処理水を循環した場合には、嫌気処理の効率が低下してしまうという問題があった。
なお、嫌気処理水を受け入れる処理水槽を設けず、嫌気反応槽内に直接スクリーンを取り付けて、嫌気反応槽内で担体を分離して嫌気処理水を取り出すようにした嫌気処理装置もあるが、このような嫌気処理装置においても、上記と同様の問題がある。
Also, in anaerobic treatment, the alkalinity of the treated water is used by mixing a part of the treated water with raw water and introducing it into an anaerobic reaction tank (or an acid generation tank if an acid generation tank is provided upstream of the anaerobic reaction tank). Thus, the amount of alkali used for neutralization at the time of acid generation can be reduced. However, when treated water containing dissolved oxygen by aeration is circulated, there is a problem that the efficiency of anaerobic treatment is lowered.
In addition, there is an anaerobic treatment device that does not have a treated water tank for receiving anaerobic treated water, but attaches a screen directly to the anaerobic reaction tank, separates the carrier in the anaerobic reaction tank, and takes out the anaerobic treated water. Such an anaerobic treatment apparatus also has the same problem as described above.

本発明は上記従来の問題点を解決し、曝気に起因するスクリーンへのスライムやスケールの付着、閉塞を防止して安定した嫌気処理を行うと共に、処理水を循環する場合においても、処理水中の溶存酸素による嫌気処理効率の低下を防止することができる有機性排水の嫌気処理装置を提供することを目的とする。   The present invention solves the above-described conventional problems, prevents slime and scale from adhering to the screen due to aeration, prevents clogging, performs stable anaerobic treatment, and even when circulating the treated water, An object of the present invention is to provide an anaerobic treatment apparatus for organic wastewater that can prevent a decrease in anaerobic treatment efficiency due to dissolved oxygen.

本発明者は、上記課題を解決すべく検討を行った結果、スクリーンを常時曝気することなく、槽内の水位が所定値以上に上昇したときだけ曝気を行い、水位が低い場合には曝気を停止するように、曝気のオン/オフ制御を行うことにより、常時曝気を行う場合に比べて、曝気によるスライムやスケールの生成を低減してスクリーンの閉塞を防止し、また、曝気停止時には溶存酸素を含まない処理水を循環することができ、溶存酸素による嫌気処理効率の低下を防止することができることを見出した。   As a result of studies to solve the above problems, the present inventor performs aeration only when the water level in the tank rises above a predetermined value without constantly aeration of the screen, and aeration is performed when the water level is low. By controlling the aeration so that it stops, the generation of slime and scale due to aeration is reduced to prevent clogging of the screen, compared to the case of continuous aeration, and dissolved oxygen is used when aeration is stopped. It has been found that treated water containing no oxygen can be circulated, and a decrease in anaerobic treatment efficiency due to dissolved oxygen can be prevented.

本発明はこのような知見に基いて達成されたものであり、以下を要旨とする。   The present invention has been achieved on the basis of such findings, and the gist thereof is as follows.

[1] 槽内に担体を保有し、該担体に付着した嫌気性微生物により有機性排水を嫌気処理する流動床式嫌気反応槽と、嫌気処理水から担体を分離するスクリーンと、該スクリーンの下方に設けられ、該スクリーンを曝気洗浄するための曝気手段とを備えた有機性排水の嫌気処理装置において、該曝気手段の作動を、前記スクリーンが設けられた槽の水位に応じて制御する制御手段を有することを特徴とする有機性排水の嫌気処理装置。 [1] A fluidized bed type anaerobic reaction tank that holds a carrier in the tank and anaerobically treats organic wastewater with anaerobic microorganisms attached to the carrier, a screen that separates the carrier from the anaerobic treated water, and a lower part of the screen In an anaerobic treatment apparatus for organic wastewater provided with an aeration means for aeration cleaning of the screen, a control means for controlling the operation of the aeration means according to the water level of the tank provided with the screen An anaerobic treatment apparatus for organic wastewater characterized by comprising:

[2] [1]において、前記嫌気反応槽の流出水を受け入れる処理水槽を有し、前記スクリーンは、該処理水槽内に設けられており、前記制御手段は、該処理水槽の水位に応じて前記曝気手段の作動を制御することを特徴とする有機性排水の嫌気処理装置。 [2] In [1], the apparatus has a treated water tank that receives the effluent water of the anaerobic reaction tank, the screen is provided in the treated water tank, and the control unit is configured according to a water level of the treated water tank. An anaerobic treatment apparatus for organic waste water, which controls the operation of the aeration means.

[3] [1]において、前記スクリーンは、前記嫌気反応槽内に設けられており、前記制御手段は、該嫌気反応槽内の水位に応じて前記曝気手段の作動を制御することを特徴とする有機性排水の嫌気処理装置。 [3] In [1], the screen is provided in the anaerobic reaction tank, and the control means controls the operation of the aeration means according to a water level in the anaerobic reaction tank. Organic wastewater anaerobic treatment equipment.

[4] [1]ないし[3]のいずれかにおいて、前記制御手段は、前記水位が予め設定された第1の所定値以上に上昇したときに、前記曝気手段を作動させることを特徴とする有機性排水の嫌気処理装置。 [4] In any one of [1] to [3], the control means operates the aeration means when the water level rises to a preset first predetermined value or more. Organic wastewater anaerobic treatment equipment.

[5] [4]において、前記制御手段は、前記水位が予め設定された第2の所定値以下に低下したときに、前記曝気手段を停止させることを特徴とする有機性排水の嫌気処理装置。 [5] In [4], the control means stops the aeration means when the water level falls below a second predetermined value set in advance. .

[6] [1]ないし[5]のいずれかにおいて、前記嫌気反応槽の前段に設けられた酸生成槽と、前記担体と分離された嫌気処理水の一部を該酸生成槽に循環する処理水循環手段とを有することを特徴とする有機性排水の嫌気処理装置。 [6] In any one of [1] to [5], an acid generation tank provided in a preceding stage of the anaerobic reaction tank and a part of the anaerobic treated water separated from the carrier are circulated to the acid generation tank. An anaerobic treatment apparatus for organic wastewater, characterized by comprising treated water circulation means.

本発明によれば、嫌気反応槽に担体を添加した流動床方式の嫌気処理装置において、担体と処理水を分離するスクリーンのスライムやスケールによる閉塞を防止して、安定した処理を行うことができる。
また、処理水を循環する場合においては、溶存酸素を含む処理水を循環させることが少なくなるため、処理水のアルカリ度を利用して中和剤の使用量を減らしながら、安定した嫌気処理を行うことができる。
また、本発明では、常時スクリーンの曝気を行う従来法に比べて、曝気を間欠的に行うことで、曝気のためのエネルギーコストを低減することもできる。
According to the present invention, in a fluidized bed type anaerobic treatment apparatus in which a carrier is added to an anaerobic reaction tank, it is possible to prevent the clogging of the screen separating the carrier and the treated water due to slime and scale and perform stable treatment. .
In addition, when processing water is circulated, it is less likely to circulate the processing water containing dissolved oxygen, so a stable anaerobic treatment is performed while reducing the amount of neutralizer using the alkalinity of the processing water. It can be carried out.
Further, in the present invention, the energy cost for aeration can be reduced by intermittently performing aeration as compared with the conventional method in which the screen is always aerated.

(a)図は、本発明の有機性排水の嫌気処理装置の実施の形態を示す系統図であり、(b)図は処理水槽の実施の形態を示す系統図である。(A) The figure is a systematic diagram which shows embodiment of the anaerobic treatment apparatus of the organic waste_water | drain of this invention, (b) The figure is a systematic diagram which shows embodiment of a treated water tank.

以下、図面を参照して本発明の有機性排水の嫌気処理装置の実施の形態を詳細に説明する。
図1(a)は、本発明の有機性排水の嫌気処理装置の実施の形態を示す系統図であり、図1(b)は、処理水槽の実施の形態を示す系統図である。なお、図1(b)において、嫌気反応槽3内の担体10は図示を省略してある。
DESCRIPTION OF EMBODIMENTS Hereinafter, an embodiment of an organic wastewater anaerobic treatment apparatus of the present invention will be described in detail with reference to the drawings.
Fig.1 (a) is a systematic diagram which shows embodiment of the anaerobic treatment apparatus of the organic waste_water | drain of this invention, FIG.1 (b) is a systematic diagram which shows embodiment of a treated water tank. In addition, in FIG.1 (b), the support | carrier 10 in the anaerobic reaction tank 3 is abbreviate | omitting illustration.

本発明の有機性排水の嫌気処理装置は、槽内に担体を保有し、該担体に付着した嫌気性微生物により有機性排水を嫌気処理する流動床式嫌気反応槽と、嫌気処理水から担体を分離するスクリーンと、該スクリーンの下方に設けられ、該スクリーンを曝気洗浄するための曝気手段とを備えた有機性排水の嫌気処理装置において、該曝気手段の作動を前記スクリーンが設けられた槽の水位に応じて制御する制御手段を有することを特徴とする。   The organic wastewater anaerobic treatment apparatus of the present invention has a carrier in a tank, a fluidized bed type anaerobic reaction tank for anaerobically treating organic wastewater by anaerobic microorganisms attached to the carrier, and a carrier from anaerobic treated water. In an anaerobic treatment apparatus for organic wastewater provided with a screen to be separated and an aeration means provided under the screen for aeration cleaning of the screen, the operation of the aeration means is performed in a tank provided with the screen. It has the control means which controls according to a water level, It is characterized by the above-mentioned.

即ち、本発明では、スクリーン洗浄用の曝気を、スクリーンを設置した水槽の水位が予め設定した所定値(以下「設定値」と称す。)以上の場合にのみ行い、設定値より低い場合には停止するように曝気手段の作動を制御して、常時曝気ではなく間欠曝気を行う。   That is, in the present invention, aeration for screen cleaning is performed only when the water level of the water tank in which the screen is installed is equal to or higher than a predetermined value (hereinafter referred to as “set value”), and when the water level is lower than the set value. By controlling the operation of the aeration means so as to stop, intermittent aeration is performed instead of continuous aeration.

嫌気反応槽内の担体は、微生物が付着していない投入初期に特に浮きやすく、嫌気反応槽から流出しやすいが、微生物が多く付着するにつれて重くなるため、流出量は少なくなる傾向にある。しかし、有機物負荷が高くなると、処理に伴い発生するガス(気泡)に随伴して浮上流出する担体が増えるなど、嫌気反応槽から流出する担体量は一定でないが、スクリーンが担体により閉塞して水槽の水位が設定値より上昇した場合のみ曝気洗浄を行うことでも、十分にスクリーンにより担体を分離することができ、また、このように必要時にのみ曝気を行うことにより、常時曝気する必要がなくなる。
その結果、スクリーンを曝気する頻度が少なくなり、スライムやスケール生成によるスクリーンの閉塞を防止することができる。また、溶存酸素を含む処理水を循環させることが少なくなるため、処理水のアルカリ度を利用して中和剤の使用量を減らしながら、安定した嫌気処理を行うことができる。
The carrier in the anaerobic reaction tank is likely to float particularly at the initial stage when the microorganisms are not attached and easily flows out of the anaerobic reaction tank. However, the carrier becomes heavier as more microorganisms are attached, and the outflow amount tends to decrease. However, when the organic substance load increases, the amount of the carrier that flows out from the anaerobic reaction tank is not constant, such as the amount of the carrier that floats and flows along with the gas (bubbles) generated by the treatment, but the screen is blocked by the carrier and the water tank Even if aeration cleaning is performed only when the water level rises above the set value, the carrier can be sufficiently separated by the screen, and by performing aeration only when necessary in this way, it is not necessary to constantly aerate.
As a result, the frequency of aeration of the screen is reduced, and it is possible to prevent clogging of the screen due to slime and scale generation. Moreover, since it is less likely to circulate the treated water containing dissolved oxygen, it is possible to perform a stable anaerobic treatment while reducing the amount of neutralizer using the alkalinity of the treated water.

図1(a)の有機性排水の嫌気処理装置は、嫌気反応槽2の前段に酸生成槽1を有し、配管11から導入された原水(有機性排水)は、配管16からの循環処理水と共に、酸生成槽1で処理された後、担体10を保有する嫌気反応槽2に導入され、担体10に付着した嫌気性微生物により嫌気処理される。嫌気反応槽2で嫌気処理された嫌気処理水は、配管13を経て処理水槽3に送給される。この嫌気処理水と共に嫌気反応槽2から担体が流出するが、嫌気処理水と共に嫌気反応槽2から流出した担体10は、処理水槽3内で、スクリーン4により分離される。スクリーン4で分離され、処理水槽3内の底部に溜まった担体10は水中ポンプ5により配管17を経て嫌気反応槽2に返送される。一方、担体10が分離された嫌気処理水は、配管14より抜き出され、一部が配管16を経て酸生成槽1に循環され、残部は配管15より処理水として系外へ排出される。   The organic wastewater anaerobic treatment apparatus in FIG. 1A has an acid generation tank 1 in the previous stage of the anaerobic reaction tank 2, and the raw water (organic wastewater) introduced from the pipe 11 is circulated from the pipe 16. After being treated in the acid generation tank 1 together with water, it is introduced into the anaerobic reaction tank 2 holding the carrier 10 and is anaerobically treated by anaerobic microorganisms attached to the carrier 10. The anaerobic treated water that has been anaerobically treated in the anaerobic reaction tank 2 is fed to the treated water tank 3 through the pipe 13. The carrier flows out of the anaerobic reaction tank 2 together with the anaerobic treated water, but the carrier 10 that flows out of the anaerobic reaction tank 2 together with the anaerobic treated water is separated by the screen 4 in the treated water tank 3. The carrier 10 separated by the screen 4 and accumulated at the bottom in the treated water tank 3 is returned to the anaerobic reaction tank 2 through the pipe 17 by the submersible pump 5. On the other hand, the anaerobic treated water from which the carrier 10 has been separated is extracted from the pipe 14, a part is circulated through the pipe 16 to the acid generation tank 1, and the remainder is discharged from the pipe 15 as treated water to the outside of the system.

処理水槽3内のスクリーン4の下方には、スクリーン4を曝気洗浄するための曝気手段としての散気管6が設けられている。6Aはこの散気管6に曝気空気を送るブロワである。   A diffuser pipe 6 is provided below the screen 4 in the treated water tank 3 as aeration means for aeration cleaning the screen 4. A blower 6 </ b> A sends aeration air to the air diffuser 6.

図1(b)に示す如く、処理水槽3内には水位計(レベルスイッチ)7が設けられており、この水位計7で検知される処理水槽3の水位に応じて、ブロワ6Aが作動するように、ブロワ6Aが水位計7に連動している。   As shown in FIG. 1B, a water level gauge (level switch) 7 is provided in the treated water tank 3, and the blower 6A operates according to the water level of the treated water tank 3 detected by the water level gauge 7. As described above, the blower 6 </ b> A is interlocked with the water level gauge 7.

即ち、ブロワ6Aを停止して、曝気洗浄を行わずに処理を継続すると、スクリーン4が担体10により閉塞し、スクリーン4の閉塞で処理水がスクリーン4から流出し難くなることにより、処理水槽3の水位が上昇してくる。処理水槽3の水位が設定値Hに達したことを水位計7が検知した場合には、ブロワ6Aの作動信号を発信して曝気を開始する。曝気洗浄を継続することにより、スクリーン4の閉塞が解消され、スクリーン4から処理水が円滑に流出し、処理水3の水位が設定値Hまで低下したことを水位計7が検知した場合には、ブロワ6Aの停止信号を発信して曝気を停止する。 That is, when the blower 6A is stopped and the processing is continued without performing aeration cleaning, the screen 4 is blocked by the carrier 10, and the processing water is difficult to flow out of the screen 4 due to the blockage of the screen 4. The water level rises. When the water level gauge 7 that the water level of processed water tank 3 reaches the set value H 1 is detected, it starts aeration to disseminate the actuation signal of the blower 6A. By continuing the aeration cleaning, clogging of the screen 4 is eliminated, the treated water is smoothly flow out from the screen 4, that the water level of the treated water 3 is lowered to the set value H 2 when the water level gauge 7 senses Sends a stop signal of the blower 6A to stop aeration.

このように、処理水槽3内の水位に応じて、曝気のオン/オフ制御を行って、処理水槽3内の水位を常に設定値Hと設定値Hとの間に維持することにより、スクリーン4の閉塞防止に最低限必要な曝気洗浄を行った上で、安定かつ効率的な嫌気処理を行える。 Thus, depending on the water level in the treating tank 3, by performing the aeration of the on / off control, by maintaining the water level in the treating tank 3 always between set value H 1 and the set value H 2, It is possible to perform a stable and efficient anaerobic treatment after performing aeration cleaning necessary for preventing the screen 4 from being blocked.

なお、処理水槽3の水位の設定値H,Hは、処理水槽の深さや処理水量などに応じて、スクリーンの閉塞で水位が上昇して水が溢れ出ないようにした上で、曝気間隔(曝気停止時間)が十分にとれるように適宜設定される。
例えば、水位の上限設定値(第1の設定値)Hは、スクリーンが設けられている水槽の有効水位よりも10〜20cm程度低い位置とし、下限設定値(第2の設定値)Hは、このHより10〜20cm程度低い位置であって、有効水位を同等もしくは0〜5cm程度の高さの位置とすることが好ましい。
The set values H 1 and H 2 of the water level of the treated water tank 3 are set according to the depth of the treated water tank and the amount of treated water so that the water level rises due to the clogging of the screen and the water does not overflow. The interval (aeration stop time) is set as appropriate so that a sufficient interval can be obtained.
For example, the upper limit set value (first set value) H 1 of the water level is set to a position lower by about 10 to 20 cm than the effective water level of the water tank provided with the screen, and the lower limit set value (second set value) H 2. is a 10~20cm about a position lower than the H 1, it is preferable that the position of the height of about equal to or 0~5cm an effective level.

本発明の有機性排水の嫌気処理装置は、このように、水位に応じてスクリーンの間欠曝気を行うこと以外は、嫌気反応槽及びその担体、その他の処理条件については、通常の嫌気処理条件を採用することができる。   The organic wastewater anaerobic treatment apparatus of the present invention, as described above, except for the intermittent aeration of the screen according to the water level, the anaerobic reaction tank and its carrier, and other treatment conditions, normal anaerobic treatment conditions. Can be adopted.

嫌気反応槽に添加する担体の素材、形状、大きさは特に指定されないが、ポリプロピレン等のポリオレフィンなどの樹脂製のものが好ましく、その比重は1.1〜1.3前後の水より若干大きいものがよい。担体の大きさは、平均粒径1〜30mm、特に3〜10mm程度のものが好ましい。   Although the material, shape, and size of the carrier added to the anaerobic reaction tank are not particularly specified, those made of resin such as polyolefin such as polypropylene are preferable, and the specific gravity is slightly larger than about 1.1 to 1.3 water. Is good. The carrier has an average particle diameter of 1 to 30 mm, particularly about 3 to 10 mm.

嫌気反応槽への担体の充填率(槽有効容積に対する担体の見掛けの体積割合)としては、10〜60%、特に40〜60%程度とすることが好ましい。   The filling rate of the carrier into the anaerobic reaction tank (apparent volume ratio of the carrier to the tank effective volume) is preferably about 10 to 60%, particularly about 40 to 60%.

担体分離用のスクリーンの材質は、耐腐食性に優れた樹脂製が好ましい。スクリーンの形状は特に限定されず、板状、筒状のいずれでもよく、樹脂製のウェッジワイヤー、パンチングメタル、織金網などが用いられる。スクリーンの目開きは担体の平均粒径の80%以下であることが好ましく、また、スクリーンの透過流速は、80m/m−スクリーン/hr以下、特に15〜50m/m−スクリーン/hrが好ましい。
スクリーンを曝気洗浄する際の曝気洗浄空気量は2〜20m/m−スクリーン/hr、特に5〜10m/m−スクリーン/hrが好ましい。
The material of the screen for separating the carrier is preferably made of a resin having excellent corrosion resistance. The shape of the screen is not particularly limited, and may be either a plate shape or a cylindrical shape, and a resin wedge wire, a punching metal, a woven wire mesh, or the like is used. The opening of the screen is preferably 80% or less of the average particle diameter of the support, and the permeation flow rate of the screen is 80 m 3 / m 2 -screen / hr or less, particularly 15 to 50 m 3 / m 2 -screen / hr is preferred.
Aeration flushing air amount when aerating cleaning the screen 2~20m 3 / m 2 - Screen / hr, especially 5~10m 3 / m 2 - Screen / hr is preferred.

図1においては、嫌気反応槽2の前段に酸生成槽1が設けられているが、この酸生成槽1は省略してもよい。いずれの場合においても、嫌気処理水を原水に対して0.5〜10倍量循環して原水と混合して酸生成槽又は嫌気反応槽に導入することで、嫌気処理水のアルカリ度を使用して酸生成時の中和用アルカリ使用量を削減することができる。   In FIG. 1, although the acid generation tank 1 is provided in the front | former stage of the anaerobic reaction tank 2, this acid generation tank 1 may be abbreviate | omitted. In any case, the alkalinity of the anaerobic treated water is used by circulating the anaerobic treated water 0.5 to 10 times the amount of the raw water, mixing with the raw water and introducing it into the acid generation tank or the anaerobic reaction tank. As a result, the amount of alkali used for neutralization during acid generation can be reduced.

図1では、嫌気反応槽とは別に処理水槽を設け、処理水槽において、スクリーンで処理水と担体とを分離しているが、処理水槽を省略して嫌気反応槽内の上部流出口部分にスクリーンを設け、このスクリーンの下方に曝気手段を設けるようにしてもよい。この場合、曝気用のガスとしては空気ではなく、窒素ガス等の酸素を含まないガスを用いてもよく、また、スクリーンの近傍に仕切板を設け、曝気空気がスクリーン近傍にのみ散気されるようにすることもできる。   In FIG. 1, a treated water tank is provided separately from the anaerobic reaction tank, and the treated water and the carrier are separated by a screen in the treated water tank, but the treated water tank is omitted and a screen is provided at the upper outlet portion in the anaerobic reaction tank. And aeration means may be provided below the screen. In this case, the gas for aeration is not air but a gas not containing oxygen such as nitrogen gas may be used, and a partition plate is provided in the vicinity of the screen so that the aeration air is diffused only in the vicinity of the screen. It can also be done.

以下に実施例及び比較例を挙げて本発明をより具体的に説明する。   Hereinafter, the present invention will be described more specifically with reference to Examples and Comparative Examples.

<実施例1>
図1に示す有機性排水の嫌気処理装置により液晶製造工場排水(TOC150mg/Lの水)を嫌気処理した。
嫌気反応槽には、比重1.2、平均粒径5mmのポリプロピレン製担体を充填率50%で添加した。
<Example 1>
Liquid crystal production factory wastewater (TOC 150 mg / L water) was anaerobically treated with the organic wastewater anaerobic treatment device shown in FIG.
A polypropylene carrier having a specific gravity of 1.2 and an average particle size of 5 mm was added to the anaerobic reaction tank at a filling rate of 50%.

処理水槽の有効水位は400cmであり、この処理水槽に対して上限設定値Hを底面から420cm、下限設定値Hを底面から403cmの高さとした。
スクリーンとしては目開き3.5mmのポリプロピレン製の網を用い、スクリーンは有効水位から35cmの高さまで設置した。スクリーンの透過流速は30m/m−スクリーン/hrとし、曝気洗浄時の曝気空気量は10m/m−スクリーン/hrとした。
処理水槽からの嫌気処理水の循環水量は原水に対して4倍とした。
Effective level of treatment water tank is 400 cm, and the upper limit set value H 1 from the bottom with respect to the process water tank 420 cm, the lower limit set value H 2 from the bottom to the height of 403cm.
As the screen, a mesh made of polypropylene having an opening of 3.5 mm was used, and the screen was installed from the effective water level to a height of 35 cm. The permeation flow rate of the screen was 30 m 3 / m 2 -screen / hr, and the amount of aeration air during aeration cleaning was 10 m 3 / m 2 -screen / hr.
The circulation amount of the anaerobic treated water from the treated water tank was four times that of the raw water.

上記の条件で、設定値H以上でスクリーンの曝気洗浄を行い、設定値H以下で曝気洗浄を停止する制御を行って3ヶ月間嫌気処理を行ったところ、スクリーンの曝気洗浄は多いときでも1月に2〜3回、20〜30分間曝気を行うのみでよく、安定に嫌気処理を継続することができた。
この嫌気処理において、原水の有機物濃度と得られた嫌気処理水の有機物濃度とから算出した有機物除去率の平均は88%であった。
In the above conditions, when subjected to aeration cleaning screen with the set value H 1 or more, it was subjected to 3 months anaerobic process performs a control to stop the aeration washed with setpoint H 2 or less, aeration cleaning screens often However, it was only necessary to perform aeration for 2 to 3 times in January for 20 to 30 minutes, and the anaerobic treatment could be continued stably.
In this anaerobic treatment, the average organic matter removal rate calculated from the organic matter concentration of the raw water and the organic matter concentration of the obtained anaerobic treated water was 88%.

<比較例1>
実施例1において、スクリーンの曝気洗浄を常時継続して行ったこと以外は同様にして嫌気処理を行ったところ、1ヶ月が経過した頃からスクリーンにスライムやスケールが付着して、処理水槽の水位は大きく上昇し、38日目にはスクリーンもオーバーフローするようになり、一部担体が流出した。
また、曝気により溶存酸素を含む処理水が常時酸生成槽に循環されることにより、嫌気処理効率が低下し、有機物除去率の平均は67%となった。
<Comparative Example 1>
In Example 1, the anaerobic treatment was performed in the same manner except that the screen was continuously aerated and washed, and slime and scale adhered to the screen from the time when one month passed, and the water level in the treated water tank Increased significantly, and on the 38th day, the screen also overflowed, and part of the carrier flowed out.
Moreover, the anaerobic treatment efficiency fell and the average of the organic substance removal rate became 67% because the treated water containing dissolved oxygen was always circulated to the acid generation tank by aeration.

1 酸生成槽
2 嫌気反応槽
3 処理水槽
4 スクリーン
5 水中ポンプ
6 散気管
6A ブロワ
7 水位計
DESCRIPTION OF SYMBOLS 1 Acid production tank 2 Anaerobic reaction tank 3 Treated water tank 4 Screen 5 Submersible pump 6 Aeration pipe 6A Blower 7 Water level meter

Claims (6)

槽内に担体を保有し、該担体に付着した嫌気性微生物により有機性排水を嫌気処理する流動床式嫌気反応槽と、嫌気処理水から担体を分離するスクリーンと、該スクリーンの下方に設けられ、該スクリーンを曝気洗浄するための曝気手段とを備えた有機性排水の嫌気処理装置において、
該曝気手段の作動を、前記スクリーンが設けられた槽の水位に応じて制御する制御手段を有することを特徴とする有機性排水の嫌気処理装置。
A fluidized bed type anaerobic reaction tank that holds a carrier in the tank and anaerobically treats organic wastewater with anaerobic microorganisms attached to the carrier, a screen that separates the carrier from the anaerobic treated water, and a lower part of the screen. In the anaerobic treatment apparatus for organic wastewater comprising aeration means for aeration cleaning the screen,
An anaerobic treatment apparatus for organic wastewater, comprising control means for controlling the operation of the aeration means in accordance with the water level of a tank provided with the screen.
請求項1において、前記嫌気反応槽の流出水を受け入れる処理水槽を有し、前記スクリーンは、該処理水槽内に設けられており、前記制御手段は、該処理水槽の水位に応じて前記曝気手段の作動を制御することを特徴とする有機性排水の嫌気処理装置。   In Claim 1, It has a treated water tank which receives the effluent of the anaerobic reaction tank, The screen is provided in the treated water tank, The control means according to the water level of the treated water tank An anaerobic treatment apparatus for organic wastewater, characterized by controlling the operation of the water. 請求項1において、前記スクリーンは、前記嫌気反応槽内に設けられており、前記制御手段は、該嫌気反応槽内の水位に応じて前記曝気手段の作動を制御することを特徴とする有機性排水の嫌気処理装置。   2. The organic material according to claim 1, wherein the screen is provided in the anaerobic reaction tank, and the control means controls the operation of the aeration means in accordance with a water level in the anaerobic reaction tank. Wastewater anaerobic treatment equipment. 請求項1ないし3のいずれか1項において、前記制御手段は、前記水位が予め設定された第1の所定値以上に上昇したときに、前記曝気手段を作動させることを特徴とする有機性排水の嫌気処理装置。   The organic drainage according to any one of claims 1 to 3, wherein the control means activates the aeration means when the water level rises to a preset first predetermined value or more. Anaerobic treatment equipment. 請求項4において、前記制御手段は、前記水位が予め設定された第2の所定値以下に低下したときに、前記曝気手段を停止させることを特徴とする有機性排水の嫌気処理装置。   5. The organic wastewater anaerobic treatment apparatus according to claim 4, wherein the control means stops the aeration means when the water level falls below a second predetermined value set in advance. 請求項1ないし5のいずれか1項において、前記嫌気反応槽の前段に設けられた酸生成槽と、前記担体と分離された嫌気処理水の一部を該酸生成槽に循環する処理水循環手段とを有することを特徴とする有機性排水の嫌気処理装置。   The treated water circulation means according to any one of claims 1 to 5, wherein an acid generation tank provided in a preceding stage of the anaerobic reaction tank and a part of the anaerobic treated water separated from the carrier are circulated to the acid generation tank. An anaerobic treatment apparatus for organic wastewater characterized by comprising:
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017159204A (en) * 2016-03-08 2017-09-14 住友重機械エンバイロメント株式会社 Water treatment equipment and operation method thereof

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017159204A (en) * 2016-03-08 2017-09-14 住友重機械エンバイロメント株式会社 Water treatment equipment and operation method thereof

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