JP2003275759A - Water treatment device - Google Patents
Water treatment deviceInfo
- Publication number
- JP2003275759A JP2003275759A JP2002077897A JP2002077897A JP2003275759A JP 2003275759 A JP2003275759 A JP 2003275759A JP 2002077897 A JP2002077897 A JP 2002077897A JP 2002077897 A JP2002077897 A JP 2002077897A JP 2003275759 A JP2003275759 A JP 2003275759A
- Authority
- JP
- Japan
- Prior art keywords
- membrane
- air
- water
- amount
- treatment tank
- 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.)
- Pending
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
- Separation Using Semi-Permeable Membranes (AREA)
- Activated Sludge Processes (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は水処理装置に係り、
特に処理槽内に膜分離手段を備えた水処理装置に関す
る。TECHNICAL FIELD The present invention relates to a water treatment device,
In particular, it relates to a water treatment device provided with a membrane separating means in a treatment tank.
【０００２】[0002]
【従来の技術】従来のこの種の水処理装置としては図４
に示したものが知られている。処理槽１には管路２から
流入した被処理水が満たされており、好気性の微生物が
高濃度に保持されている。また、処理槽１には複数基の
膜ユニット３からなる膜分離手段が浸漬されている。各
膜ユニット３の下方には散気管４が配設され、ブロワ５
からの圧縮空気が散気管４から散気される。膜ユニット
３の二次側には配管６が接続し、この配管６に流量計７
と吸引ポンプ８が設けられている。2. Description of the Related Art FIG. 4 shows a conventional water treatment device of this type.
The ones shown in are known. The treatment tank 1 is filled with the water to be treated that has flowed in from the pipe line 2, and the aerobic microorganisms are kept at a high concentration. In addition, a membrane separation means including a plurality of membrane units 3 is immersed in the treatment tank 1. An air diffuser 4 is arranged below each membrane unit 3, and a blower 5
Compressed air from is diffused from the diffuser 4. A pipe 6 is connected to the secondary side of the membrane unit 3, and a flow meter 7 is connected to the pipe 6.
And a suction pump 8 are provided.
【０００３】処理槽１内の被処理水は高濃度に保持され
微生物による酸化作用によって生物処理され浄化され
る。被処理水は各膜ユニット３の二次側から配管６を介
して吸引ポンプ８によって吸引され処理水として装置外
に排出される。この際、吸引ポンプ８は流量計７で検出
される処理水量が一定となるように、例えば回転数制御
によって駆動される。散気管４から散気される空気は微
生物の生物処理に必要な酸素源として利用される。ま
た、散気によるエネルギが被処理水を流動させ、膜ユニ
ット３の膜面での濃度分極を防止するとともに、膜面の
洗浄にも利用される。上記の生物処理に必要な空気量と
膜洗浄に必要な空気量とを比較すると通常は前者の方が
多い。したがって、散気管４では生物処理に必要な空気
量を複数基の膜ユニット３の基数で割った量を各膜ユニ
ット３の下方から均等に散気するようにしている。The water to be treated in the treatment tank 1 is maintained at a high concentration and biologically treated and purified by the oxidizing action of microorganisms. The water to be treated is sucked by the suction pump 8 from the secondary side of each membrane unit 3 through the pipe 6 and discharged to the outside of the apparatus as treated water. At this time, the suction pump 8 is driven by, for example, rotation speed control so that the amount of treated water detected by the flow meter 7 becomes constant. The air diffused from the air diffuser 4 is used as an oxygen source required for biological treatment of microorganisms. Further, the energy due to air diffusion causes the water to be treated to flow, prevents concentration polarization on the membrane surface of the membrane unit 3, and is also used for cleaning the membrane surface. When comparing the amount of air required for the biological treatment with the amount of air required for membrane cleaning, the former is usually higher. Therefore, in the air diffuser 4, the amount of air required for biological treatment is divided by the number of the plurality of membrane units 3 to uniformly diffuse air from the lower side of each membrane unit 3.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、前記複
数基の膜ユニットは処理槽内での配置等によって被処理
水との接触状況がそれぞれ異なる。このため、運転を長
時間継続すると、各膜ユニットの間で膜面の汚れ状況に
偏りが生じる。したがって、上記の散気による膜洗浄と
は別個に定期的な薬品洗浄を実施した場合でも、汚染状
態がひどい膜ユニットには汚染の履歴が残り易く、寿命
を縮めるという問題点があった。本発明の目的は上記従
来技術の問題点を改善し、各膜ユニットの間で膜面の汚
れ状況に偏りが生じ難く、膜ユニットの平均寿命を延ば
すことができる水処理装置を提供することにある。However, the contact states of the plurality of membrane units with the water to be treated are different depending on the arrangement in the treatment tank and the like. For this reason, when the operation is continued for a long time, the condition of fouling of the membrane surface becomes uneven among the membrane units. Therefore, even when the periodical chemical cleaning is performed separately from the above-mentioned film cleaning by air diffusion, there is a problem that the history of contamination is apt to remain in the membrane unit having a serious contamination state and the life is shortened. An object of the present invention is to improve the above-mentioned problems of the prior art, and to provide a water treatment apparatus capable of prolonging the average life of a membrane unit, in which the soiling state of the membrane surface is less likely to be biased among the membrane units. is there.
【０００５】[0005]
【課題を解決するための手段】請求項１に係る発明は、
被処理水を満たした処理槽と、この処理槽内に浸漬され
た複数基の膜ユニットと、これらの各膜ユニットの下方
に空気を散気する散気手段とを備え、前記処理槽に流入
した被処理水を前記各膜ユニットの二次側から吸引して
処理水として処理槽外に排出するようにした水処理装置
において、前記散気手段から散気する空気量を前記各膜
ユニットごとに膜の汚れの程度に応じて調整可能とした
ことを特徴とする。The invention according to claim 1 is
A treatment tank filled with water to be treated, a plurality of membrane units immersed in the treatment tank, and an air diffuser for diffusing air below each of these membrane units are provided, and flow into the treatment tank. In the water treatment device configured to suck the treated water from the secondary side of each of the membrane units and discharge the treated water to the outside of the treatment tank as treated water, the amount of air diffused from the diffuser is adjusted for each of the membrane units. It is characterized in that it can be adjusted according to the degree of contamination of the film.
【０００６】請求項２に係る発明は、請求項１に係る発
明において、前記各膜ユニットの二次側の配管にそれぞ
れ圧力計を配備し、各膜ユニットから吸引する処理水の
水量をほぼ同一にした場合に前記各圧力計によって検出
される吸引圧に応じて、前記散気手段が各膜ユニットに
散気する空気量を制御する制御手段を備えたことを特徴
とする。In the invention according to claim 2, in the invention according to claim 1, pressure gauges are provided in the secondary side pipes of the respective membrane units, and the amount of treated water sucked from the respective membrane units is substantially the same. In this case, the air diffusing means is provided with control means for controlling the amount of air diffused to each membrane unit according to the suction pressure detected by each pressure gauge.
【０００７】請求項３に係る発明は、請求項１に係る発
明において、前記各膜ユニットの二次側の配管にそれぞ
れ流量計を配備し、各膜ユニットに対する二次側の吸引
圧をほぼ同一にした場合に前記各流量計によって検出さ
れる処理水の流量に応じて、前記散気手段が各膜ユニッ
トに散気する空気量を制御する制御手段を備えたことを
特徴とする。According to a third aspect of the invention, in the invention according to the first aspect, a flow meter is provided in each of the secondary side pipes of each of the membrane units, and the suction pressure on the secondary side for each of the membrane units is substantially the same. In this case, the diffusing means is provided with control means for controlling the amount of air diffused to each membrane unit according to the flow rate of the treated water detected by each flow meter.
【０００８】上記の各発明によれば、膜の汚染が進行し
ている膜ユニットに対してより多くの散気量を割り当て
ることができ、各膜ユニットの間で膜面の汚れ状況に偏
りが生じることを抑制することができる。According to each of the above inventions, it is possible to allocate a larger amount of air diffusion to a membrane unit in which the contamination of the membrane is progressing, and the soiling condition of the membrane surface is biased among the membrane units. This can be suppressed.
【０００９】[0009]
【発明の実施の形態】図１は本発明の第１実施形態を示
す装置系統図である。処理槽１０には管路１２から流入
した被処理水が満たされており、好気性の微生物が高濃
度に保持されている。 また、処理槽１０には複数基の
膜ユニット１４からなる膜分離手段が浸漬されている。
各膜ユニット１４の下方にはそれぞれ散気管１６が配設
され、ブロワ１８からの圧縮空気が散気管１６から散気
される。各散気管１６とブロワ１８とを結ぶ複数の配管
２０にはそれぞれ流量調節弁２２が設けられている。各
膜ユニット１４の二次側にはそれぞれ配管２４が接続
し、各配管２４にはそれぞれ圧力計２６と流量計２８と
吸引ポンプ３０が設けられている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a system diagram showing a first embodiment of the present invention. The treatment tank 10 is filled with the water to be treated that has flowed in from the conduit 12, and the aerobic microorganisms are kept at a high concentration. In addition, a membrane separation unit including a plurality of membrane units 14 is immersed in the treatment tank 10.
Air diffusers 16 are arranged below the respective membrane units 14, and the compressed air from the blower 18 is diffused from the air diffusers 16. A flow control valve 22 is provided in each of a plurality of pipes 20 that connect each air diffuser 16 and the blower 18. A pipe 24 is connected to the secondary side of each membrane unit 14, and a pressure gauge 26, a flow meter 28, and a suction pump 30 are provided in each pipe 24.
【００１０】処理槽１０内の被処理水は高濃度に保持さ
れ微生物による酸化作用によって生物処理され浄化され
る。被処理水は各膜ユニット１４の二次側から配管２４
を介して各吸引ポンプ３０によって吸引され処理水とし
て装置外に排出される。各吸引ポンプ３０は流量計２８
で検出される処理水量が同一となるように、例えば回転
数制御によって駆動される。散気管１６から散気される
空気は微生物の酸化作用に必要な酸素源として利用され
る。また、散気によるエネルギが被処理水を流動させ、
膜ユニット１４の膜面での濃度分極を防止するととも
に、膜面の洗浄にも利用される。上記の生物処理に必要
な空気量と膜洗浄に必要な空気量とを比較すると通常は
前者の方が多い。したがって、ブロワ１８はこの生物処
理に必要な空気量を常時、散気管１４に供給する。そし
て、運転初期においてはこのブロワ１８から供給される
空気量を複数基の膜ユニット１４の基数で割った量を各
膜ユニット１４の下方から均等に散気する。すなわち、
運転開始時は各配管２０に設けられた流量調節弁２２の
開度を同一に設定し、各散気管１６から各膜ユニット１
４に向けて散気する空気量を均等にする。The water to be treated in the treatment tank 10 is kept at a high concentration and biologically treated and purified by the oxidizing action of microorganisms. The water to be treated is piped 24 from the secondary side of each membrane unit 14.
Is sucked by each suction pump 30 and discharged as treated water to the outside of the apparatus. Each suction pump 30 is a flow meter 28
It is driven by, for example, the rotation speed control so that the treated water amounts detected in 1 are the same. The air diffused from the air diffuser 16 is used as an oxygen source required for the oxidizing action of microorganisms. In addition, the energy from aeration causes the treated water to flow,
It prevents concentration polarization on the membrane surface of the membrane unit 14 and is also used for cleaning the membrane surface. When comparing the amount of air required for the biological treatment with the amount of air required for membrane cleaning, the former is usually higher. Therefore, the blower 18 constantly supplies the air diffuser 14 with the amount of air required for the biological treatment. Then, in the initial stage of the operation, the amount of air supplied from the blower 18 is divided by the number of the plurality of membrane units 14 to uniformly diffuse air from below each of the membrane units 14. That is,
At the start of operation, the opening of the flow rate control valve 22 provided in each pipe 20 is set to the same, and each diffusing pipe 16 is connected to each membrane unit 1.
Make the amount of air diffused toward 4 even.
【００１１】しかしながら、複数基の膜ユニット１４は
処理槽内での配置等によって被処理水との接触状況がそ
れぞれ異なる。このため、運転を長時間継続すると、各
膜ユニット１４の間で膜面の汚れ状況に偏りが生じる。
膜ユニットでの被処理水（処理水）の透過抵抗は膜面の
汚れの程度によって変化し、汚れの程度が大きくなるに
従って透過抵抗も大きくなる。このため、前述のとおり
各吸引ポンプ３０を流量計２８で検出される処理水量が
同一となるように駆動させると、膜面の汚れの程度が大
きい膜ユニット１４での透過抵抗が上昇し、圧力計２６
の検出値（吸引圧）が上昇する。一方、膜面の汚れの程
度が小さい膜ユニット１４では透過抵抗がさほど上昇せ
ず、圧力計２６の検出値（吸引圧）は比較的低い安定し
た値を維持する。これらの各圧力計２６によって検出さ
れる検出値は制御器３２に送信される。制御器３２では
各圧力計２６の検出値に応じて、各流量調節弁２２の開
度を調整し、各散気管１６から各膜ユニット１４に向け
て散気する空気量を制御する。However, the contact state of the plurality of membrane units 14 with the water to be treated differs depending on the arrangement in the treatment tank and the like. For this reason, when the operation is continued for a long time, the condition of fouling of the membrane surface becomes uneven among the membrane units 14.
The permeation resistance of the water to be treated (treated water) in the membrane unit changes depending on the degree of contamination on the membrane surface, and the permeation resistance increases as the degree of contamination increases. Therefore, as described above, when each suction pump 30 is driven so that the amount of treated water detected by the flow meter 28 becomes the same, the permeation resistance in the membrane unit 14 where the degree of fouling of the membrane surface is large rises, and the pressure is increased. 26 in total
Detection value (suction pressure) of increases. On the other hand, in the membrane unit 14 in which the degree of dirt on the membrane surface is small, the permeation resistance does not increase so much, and the detection value (suction pressure) of the pressure gauge 26 maintains a relatively low and stable value. The detection value detected by each of these pressure gauges 26 is transmitted to the controller 32. The controller 32 adjusts the opening degree of each flow rate control valve 22 according to the detection value of each pressure gauge 26, and controls the amount of air diffused from each diffuser pipe 16 toward each membrane unit 14.
【００１２】すなわち、圧力計２６の検出値が大きい膜
ユニット１４は膜面の汚れの程度が大きいと判断できる
ので、その膜ユニット１４に対応する流量調節弁２２の
開度を大きくする。すると、その膜ユニット１４に向け
て散気される散気管１６からの空気量が増加する。空気
量が増加すると膜ユニット１４に対する膜面洗浄作用が
強くなり、膜面の清浄度が回復する。すると、その膜ユ
ニット１４の透過抵抗が低くなり、対応する圧力計２６
の検出値も小さくなる。したがって、上記のような制御
器３２による各流量調節弁２２の開度の調整を継続する
ことによって、複数基の膜ユニット１４を膜面の汚れ状
況に偏りが生じないように運転することができる。That is, since it can be judged that the membrane unit 14 having a large detection value of the pressure gauge 26 has a large degree of fouling of the membrane surface, the opening degree of the flow control valve 22 corresponding to the membrane unit 14 is increased. Then, the amount of air from the air diffuser 16 diffused toward the membrane unit 14 increases. When the amount of air increases, the action of cleaning the membrane surface of the membrane unit 14 becomes stronger, and the cleanliness of the membrane surface is restored. Then, the permeation resistance of the membrane unit 14 becomes low, and the corresponding pressure gauge 26
The detected value of is also small. Therefore, by continuing the adjustment of the opening degree of each flow rate control valve 22 by the controller 32 as described above, it is possible to operate the plurality of membrane units 14 so that there is no unevenness in the dirty state of the membrane surface. .
【００１３】図２は制御器３２によって制御される３基
の膜ユニットでの散気量をモデル化して示した説明図で
ある。（イ）は運転開始時を示し、各膜ユニットＡ，
Ｂ，Ｃではそれぞれ均等な散気量である１００量を散気
する。この散気量の１００量は生物処理に必要な散気量
３００量を膜ユニットの基数３で除した量であり、ま
た、膜洗浄に必要な標準散気量である６０量を十分に上
廻る量である。（ロ）は一定期間の運転が経過した時の
各膜ユニットＡ，Ｂ，Ｃでの散気量を例示している。最
も汚れの少ない膜ユニットＣでは膜洗浄に必要な標準散
気量の６０量が保持される。汚れが中程度の膜ユニット
Ａでは散気量が８０量とされる。最も汚れの激しい膜ユ
ニットＢでは散気量が最大の１６０量とされる。この場
合、各膜ユニットＡ，Ｂ，Ｃの散気量の合計は生物処理
に必要な散気量３００量に維持されているので、ブロワ
１８の負荷を増強させる必要がない。なお、各膜ユニッ
トＡ，Ｂ，Ｃの各散気量がそれぞれのユニットに対応し
て設けられた圧力計２６の検出値に基いて制御器３２で
演算された結果値であることはいうまでもない。FIG. 2 is an explanatory view showing a model of the air diffusion amount in the three membrane units controlled by the controller 32. (A) indicates the start of operation, and each membrane unit A,
In B and C, the amount of 100, which is an even amount of air, is diffused. The amount of air diffusion of 100 is the amount of air diffusion required for biological treatment of 300 divided by the number of membrane units, which is 3, and the standard amount of air diffusion required for membrane cleaning of 60 is sufficiently higher. It is the amount of rotation. (B) illustrates the amount of air diffused in each of the membrane units A, B, and C when the operation for a certain period of time has elapsed. In the membrane unit C with the least contamination, the standard air diffusion amount of 60 required for membrane cleaning is retained. In the membrane unit A with a medium degree of fouling, the amount of air diffused is 80. In the membrane unit B which is the most polluted, the amount of air diffused is 160, which is the maximum. In this case, the total aeration amount of each of the membrane units A, B and C is maintained at the aeration amount of 300 required for biological treatment, so that it is not necessary to increase the load of the blower 18. In addition, it goes without saying that the aeration amount of each membrane unit A, B, C is a result value calculated by the controller 32 based on the detection value of the pressure gauge 26 provided corresponding to each unit. Nor.
【００１４】上述のとおり、本実施形態によれば複数基
の膜ユニット１４から吸引する処理水の水量を一定にし
た場合における各膜ユニット１３の汚れの程度をそれぞ
れのユニットに対応して設けられた圧力計２６の検出値
（吸引圧）によって判定するようにした。そして、これ
らの圧力計２６の検出値に応じて、汚れが激しい膜ユニ
ット１４、すなわち、圧力計２６の検出値が大きい膜ユ
ニット１４に対する散気量をより多くするように制御す
るので、複数の膜ユニット１４を膜面の汚れ状況に偏り
が生じないように運転することができる。しかも散気量
の合計を生物処理に必要な散気量に維持しつつ各膜ユニ
ットの散気量を調整するので、ブロワ１８の負荷を増強
させる必要がない。As described above, according to the present embodiment, the degree of fouling of each membrane unit 13 when the amount of treated water sucked from the plurality of membrane units 14 is constant is set corresponding to each unit. The determination is made based on the detection value (suction pressure) of the pressure gauge 26. Then, according to the detection values of these pressure gauges 26, the amount of air diffused to the membrane unit 14 which is heavily contaminated, that is, the membrane unit 14 where the detection value of the pressure gauge 26 is large, is controlled to be larger, It is possible to operate the membrane unit 14 so that the soiling condition of the membrane surface is not biased. Moreover, since the total amount of diffused air is adjusted to the amount of diffused air required for biological treatment, the amount of diffused air of each membrane unit is adjusted, so that it is not necessary to increase the load on the blower 18.
【００１５】なお、散気量を多くしても圧力計２６の検
出値が低下しない、すなわち、膜面の汚れが思うように
改善されないケースが想定される。したがって、各膜ユ
ニットの散気量には上限（例えば、膜洗浄に必要な標準
散気量の３倍）を設けることが好ましい。この場合、上
限の散気量に達した膜ユニットに対しては過大な吸引圧
が作用しないように、吸引する処理水の水量を相対的に
減少させる措置を講じることが好ましい。すなわち、図
１において各流量計２８の検出値を制御器３２に送信
し、制御器３２では散気量を上限にしても圧力計２６の
検出値が低下しない膜ユニットについては吸引する処理
水の水量を減少させるように吸引ポンプ３０の稼動を制
御する。吸引水量を減少させることによって吸引圧が低
下し、当該膜ユニットに過大な吸引圧が作用することを
防止することができる。この際、複数基の膜ユニット全
体の吸引水量を一定値以上に保持したい時は、膜の汚れ
が少なく、圧力計２６の検出値が低い膜ユニットの吸引
水量を増加させるように吸引ポンプ３０を制御すればよ
い。It is assumed that the detected value of the pressure gauge 26 does not decrease even if the amount of air diffused is increased, that is, the contamination of the film surface is not improved as expected. Therefore, it is preferable to set an upper limit (for example, three times the standard air volume required for membrane cleaning) to the air volume of each membrane unit. In this case, it is preferable to take measures to relatively reduce the amount of the treated water to be sucked, so that an excessive suction pressure does not act on the membrane unit that has reached the upper limit air diffusion amount. That is, in FIG. 1, the detection value of each flow meter 28 is transmitted to the controller 32, and the controller 32 does not lower the detection value of the pressure gauge 26 even if the air diffusion amount is set to the upper limit. The operation of the suction pump 30 is controlled so as to reduce the amount of water. It is possible to prevent the suction pressure from decreasing by reducing the suction water amount, and to prevent an excessive suction pressure from acting on the membrane unit. At this time, when it is desired to maintain the suction water amount of the entire plurality of membrane units at a certain value or more, the suction pump 30 is increased so as to increase the suction water amount of the membrane unit in which the membrane is less contaminated and the detection value of the pressure gauge 26 is low. You can control it.
【００１６】図３は本発明の第２実施形態を示す装置系
統図である。図中、図１に示した要素と同一の符号を付
した要素は図１の場合と同様の機能を有しており、説明
を省略する。この第２実施形態では各膜ユニット１４の
二次側の各配管２４が共通の配管３４に統合され、この
配管３４に共通の圧力計３６と共通の吸引ポンプ３８が
設けられている。吸引ポンプ３８を稼動することによっ
て、各膜ユニット１４の二次側の各配管２４にはほぼ同
一の吸引圧が作用する。すると、各膜ユニット１４では
膜の汚れ状況に対応した透過抵抗に基づき、それぞれ異
なった量の処理水が各配管２４に吸引され、吸引水量が
各流量計２８によって検出される。これらの各流量計２
８の検出値は制御器４０に送信される。制御器４０では
各流量計２８の検出値に応じて、各流量調節弁２２の開
度を調整し、各散気管１６から各膜ユニット１４に向け
て散気する空気量を制御する。FIG. 3 is an apparatus system diagram showing a second embodiment of the present invention. In the figure, elements given the same reference numerals as the elements shown in FIG. 1 have the same functions as in the case of FIG. In the second embodiment, the pipes 24 on the secondary side of the membrane units 14 are integrated into a common pipe 34, and the pipe 34 is provided with a common pressure gauge 36 and a common suction pump 38. By operating the suction pump 38, substantially the same suction pressure acts on each secondary pipe 24 of each membrane unit 14. Then, in each of the membrane units 14, different amounts of treated water are sucked into the pipes 24 based on the permeation resistance corresponding to the fouling condition of the membrane, and the amount of sucked water is detected by the flowmeters 28. Each of these flow meters 2
The detected value of 8 is transmitted to the controller 40. The controller 40 adjusts the opening degree of each flow rate control valve 22 according to the detection value of each flow meter 28, and controls the amount of air diffused from each diffuser pipe 16 toward each membrane unit 14.
【００１７】すなわち、流量計２８の検出値が小さい時
は、当該膜ユニット１４の膜の汚れがひどく、膜の透過
抵抗が大きいことに通じる。したがって、制御器４０で
は当該流量計２８に対応する膜ユニット１４の流量調節
弁２２の開度を大きくして、散気管１６からの散気量を
多くするように制御する。流量計２８の検出値が大きい
時は逆に対応する膜ユニット１４への散気量を少なくす
るように制御する。また、制御器４０では各流量計２８
の検出値を合計し、複数の膜ユニット全体の吸引水量が
一定値以上となるように、吸引ポンプ３８の稼動を制御
する。共通の圧力計３６の検出値が上限に達した時には
複数の膜ユニットの全体的な膜の汚れが進行していると
判定されるので、定常運転とは別個に行う薬品洗浄など
の必要な措置を講じる。That is, when the detected value of the flow meter 28 is small, it means that the membrane of the membrane unit 14 is heavily soiled and the permeation resistance of the membrane is large. Therefore, the controller 40 controls to increase the opening degree of the flow rate control valve 22 of the membrane unit 14 corresponding to the flow meter 28 to increase the amount of air diffused from the air diffuser 16. When the detected value of the flow meter 28 is large, conversely, control is performed so as to reduce the amount of air diffused to the corresponding membrane unit 14. In the controller 40, each flow meter 28
The total of the detected values of (1) and (2) are summed, and the operation of the suction pump 38 is controlled so that the suction water amount of the entire plurality of membrane units becomes a certain value or more. When the detection value of the common pressure gauge 36 reaches the upper limit, it is determined that the entire membrane of the plurality of membrane units is contaminated, so necessary measures such as chemical cleaning performed separately from the steady operation. Take action.
【００１８】この第２実施形態によれば、第１実施形態
と同様に膜の汚れ程度が大きい膜ユニット１４に対して
選択的に散気量を増大させるので、複数の膜ユニット１
４を膜面の汚れ状況に偏りが生じないように運転するこ
とができる。しかも散気量の合計を生物処理に必要な散
気量に維持しつつ各膜ユニットの散気量を調整すれば、
ブロワ１８の負荷を増強させる必要がない。また、第１
実施形態に比べて圧力計や吸引ポンプを共用化できるの
で装置の簡略化を図ることができる。According to the second embodiment, as in the first embodiment, the air diffusion amount is selectively increased with respect to the membrane unit 14 in which the degree of fouling of the membrane is large.
4 can be operated so that the dirt on the membrane surface is not biased. Moreover, by adjusting the air volume of each membrane unit while maintaining the total air volume to the air volume necessary for biological treatment,
There is no need to increase the load on the blower 18. Also, the first
Since the pressure gauge and the suction pump can be shared as compared with the embodiment, the device can be simplified.
【００１９】上記の各実施形態では、処理槽内に好気性
の微生物を高濃度に保持し、被処理水を生物処理する場
合について説明した。しかしながら、本発明はこれに限
らず、濾過処理を主目的とした水処理装置にも適用可能
である。In each of the above-mentioned embodiments, the case where the aerobic microorganisms are maintained at a high concentration in the treatment tank and the water to be treated is biologically treated has been described. However, the present invention is not limited to this, and can be applied to a water treatment device whose main purpose is filtration treatment.
【００２０】[0020]
【発明の効果】本発明の水処理装置によれば、処理槽内
に浸漬された複数基の膜ユニットへの散気量を各膜ユニ
ットごとに膜の汚れの程度に応じて調整可能としたの
で、各膜ユニットの間で膜面の汚れ状況に偏りが生じ難
く、膜ユニットの平均寿命を延ばすことができる。According to the water treatment apparatus of the present invention, the amount of air diffused into a plurality of membrane units immersed in the treatment tank can be adjusted for each membrane unit according to the degree of membrane fouling. Therefore, the soiling condition of the membrane surface is unlikely to be biased among the membrane units, and the average life of the membrane units can be extended.
【図１】本発明の第１実施形態を示す装置系統図であ
る。FIG. 1 is a device system diagram showing a first embodiment of the present invention.
【図２】第１実施形態に係る各膜ユニットでの散気量を
モデル化して示した説明図である。FIG. 2 is an explanatory diagram showing a modeled amount of air diffused in each membrane unit according to the first embodiment.
【図３】本発明の第２実施形態を示す装置系統図であ
る。FIG. 3 is a device system diagram showing a second embodiment of the present invention.
【図４】従来技術に係る水処理装置の装置系統図であ
る。FIG. 4 is a device system diagram of a water treatment device according to a conventional technique.
１０……処理槽 １４……膜ユニット １６……散気管 ２２……流量調節弁 ２４……配管 ２６、３６……圧力計 ２８……流量計 ３０、３８……吸引ポンプ ３２、４０……制御器 10 ... Treatment tank 14 ... Membrane unit 16 ... Air diffuser 22 ... Flow control valve 24 …… Piping 26, 36 ... Pressure gauge 28 ... Flowmeter 30, 38 ... Suction pump 32, 40 ... Controller
フロントページの続き Ｆターム(参考） 4D006 GA06 GA07 HA93 JA31Z JA63Z KA12 KA31 KA44 KA67 KB21 KC14 KE08P KE08Q KE22Q KE30Q PA01 PB08 PB24 PC62 4D028 BC12 BC17 BD06 BD17 CA09 CC09 Continued front page F-term (reference) 4D006 GA06 GA07 HA93 JA31Z JA63Z KA12 KA31 KA44 KA67 KB21 KC14 KE08P KE08Q KE22Q KE30Q PA01 PB08 PB24 PC62 4D028 BC12 BC17 BD06 BD17 CA09 CC09
Claims (3)
内に浸漬された複数基の膜ユニットと、これらの各膜ユ
ニットの下方に空気を散気する散気手段とを備え、前記
処理槽に流入した被処理水を前記各膜ユニットの二次側
から吸引して処理水として処理槽外に排出するようにし
た水処理装置において、 前記散気手段から散気する空気量を前記各膜ユニットご
とに膜の汚れの程度に応じて調整可能としたことを特徴
とする水処理装置。1. A treatment tank filled with water to be treated, a plurality of membrane units immersed in the treatment tank, and air diffusing means for diffusing air below each of these membrane units, In a water treatment device configured to suck the treated water that has flowed into the treatment tank from the secondary side of each of the membrane units and discharge the treated water to the outside of the treatment tank as treated water, the amount of air diffused from the diffuser is A water treatment device, wherein each of the membrane units can be adjusted according to the degree of contamination of the membrane.
れ圧力計を配備し、各膜ユニットから吸引する処理水の
水量をほぼ同一にした場合に、前記各圧力計によって検
出される吸引圧に応じて前記散気手段が各膜ユニットに
散気する空気量を制御する制御手段を備えたことを特徴
とする請求項１に記載の水処理装置。2. Suctions detected by the pressure gauges when pressure gauges are provided on the secondary side pipes of the respective membrane units and the amounts of treated water sucked from the respective membrane units are made substantially the same. The water treatment apparatus according to claim 1, further comprising a control unit that controls the amount of air diffused by each of the membrane units according to the pressure.
れ流量計を配備し、各膜ユニットに対する二次側の吸引
圧をほぼ同一にした場合に前記各流量計によって検出さ
れる処理水の流量に応じて、前記散気手段が各膜ユニッ
トに散気する空気量を制御する制御手段を備えたことを
特徴とする請求項１に記載の水処理装置。3. Treated water detected by each flow meter when a flow meter is provided on the secondary side pipe of each membrane unit and the suction pressure on the secondary side for each membrane unit is made substantially the same. The water treatment apparatus according to claim 1, wherein the air diffuser includes control means for controlling the amount of air diffused to each membrane unit according to the flow rate of the water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002077897A JP2003275759A (en) | 2002-03-20 | 2002-03-20 | Water treatment device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002077897A JP2003275759A (en) | 2002-03-20 | 2002-03-20 | Water treatment device |
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| Publication Number | Publication Date |
|---|---|
| JP2003275759A true JP2003275759A (en) | 2003-09-30 |
Family
ID=29205867
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2002077897A Pending JP2003275759A (en) | 2002-03-20 | 2002-03-20 | Water treatment device |
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| Country | Link |
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