JP2000279978A - Septic tank - Google Patents
Septic tankInfo
- Publication number
- JP2000279978A JP2000279978A JP11084995A JP8499599A JP2000279978A JP 2000279978 A JP2000279978 A JP 2000279978A JP 11084995 A JP11084995 A JP 11084995A JP 8499599 A JP8499599 A JP 8499599A JP 2000279978 A JP2000279978 A JP 2000279978A
- Authority
- JP
- Japan
- Prior art keywords
- tank
- discharge
- discharge pump
- treated water
- water
- 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.)
- Withdrawn
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)
- Treatment Of Biological Wastes In General (AREA)
- Activated Sludge Processes (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、ばっ気槽に設けた
膜分離装置よりの処理水を処理水槽へと移流し、処理水
槽の処理水を放流ポンプによって放流水路へと放流する
浄化槽に関し、詳しくは、膜分離装置の目詰まり等に起
因する放流ポンプの損傷を防止しようとする技術に係る
ものである。The present invention relates to a purification tank for transferring treated water from a membrane separation device provided in an aeration tank to a treated water tank, and discharging the treated water from the treated water tank to a discharge water channel by a discharge pump. More specifically, the present invention relates to a technique for preventing a discharge pump from being damaged due to clogging of a membrane separation device.
【０００２】[0002]
【従来の技術】従来、ばっ気槽に設けた膜分離装置より
の処理水を処理水槽へと移流し、処理水槽の処理水を放
流ポンプによって放流水路へと放流する浄化槽におい
て、膜分離装置における膜の目詰まりが進行すると、所
定の膜透過水量を得るための吸引差圧が大きくなる。こ
のような状況においては、放流ポンプによる吸引の場合
に処理水槽を含めた吸引配管内の負圧が大きくなるので
あり、例えば処理水の溶存ガスが析出するのである。し
かして、放流ポンプにエアー噛み現象が生じてエアーロ
ックによる損傷が生じるのである。又、膜分離装置を浸
漬したばっ気槽における水位と処理水槽の水位との水頭
差を利用するサイホン式の場合に上記水頭差が大きくな
るのであり、設計上の最大水頭差を越えるとエアーを直
接放流ポンプが吸い込むことになり、同様にエアーロッ
クによる損傷が生じるのである。2. Description of the Related Art Conventionally, in a purification tank in which treated water from a membrane separation device provided in an aeration tank is transferred to a treated water tank, and treated water in the treated water tank is discharged to a discharge water channel by a discharge pump. As the clogging of the membrane progresses, the suction pressure difference for obtaining a predetermined amount of permeated water increases. In such a situation, in the case of suction by the discharge pump, the negative pressure in the suction pipe including the treatment water tank increases, and for example, dissolved gas of the treatment water precipitates. As a result, the discharge pump is caught by the air, and is damaged by the air lock. Also, in the case of a siphon type using the head difference between the water level in the aeration tank in which the membrane separation device is immersed and the water level in the treatment tank, the head difference becomes large. The direct discharge pump draws in, which also results in damage from the airlock.
【０００３】[0003]
【発明が解決しようとする課題】本発明はこのよう問題
を解消しようとするものでり、膜分離装置の目詰まり等
に起因する放流ポンプの損傷を防止することができる浄
化槽を提供することを課題とするものである。SUMMARY OF THE INVENTION The present invention is intended to solve such a problem, and an object of the present invention is to provide a septic tank capable of preventing a discharge pump from being damaged due to clogging of a membrane separation device. It is an issue.
【０００４】[0004]
【課題を解決するための手段】請求項１においては、ば
っ気槽５に設けた膜分離装置Ａよりの処理水を処理水槽
１へと移流し、処理水槽１の処理水を放流ポンプ２によ
って放流水路３へと放流する浄化槽であって、放流水路
３に放流水路３における処理水の流れを検出する流れ検
出手段４を設け、流れ検出手段４による検出結果に基づ
いて放流ポンプ２の駆動・停止をおこなう制御手段を備
えていることを特徴とするものである。このような構成
によれば、放流ポンプ２の駆動・停止は、放流水路３に
処理水が流れていることの検出結果にておこなわれるの
であり、つまり、放流水路３に処理水が流れていなくて
放流ポンプ２にエアー噛みが生じる虞がある場合には、
放流ポンプ２の駆動を停止して放流ポンプ２の損傷を回
避することができる。According to the present invention, the treated water from the membrane separation device A provided in the aeration tank 5 is transferred to the treated water tank 1, and the treated water in the treated water tank 1 is discharged by the discharge pump 2. It is a septic tank that discharges water to the discharge water channel 3. The discharge water channel 3 is provided with flow detection means 4 for detecting the flow of treated water in the discharge water channel 3, and the discharge pump 2 is driven based on the detection result by the flow detection means 4. It is characterized by comprising control means for stopping. According to such a configuration, the drive / stop of the discharge pump 2 is performed based on the detection result that the treated water is flowing in the discharge water channel 3, that is, when the treated water is not flowing in the discharge water channel 3. If there is a risk that air discharge may occur in the discharge pump 2,
The driving of the discharge pump 2 can be stopped to prevent the discharge pump 2 from being damaged.
【０００５】この場合、流れ検出手段４の検出結果にか
かわらず放流ポンプ２は、ばっ気槽５におけるばっ気開
始と同時に所定時間Ｔにわたって作動するようにするの
が好ましい。In this case, it is preferable that the discharge pump 2 be operated for a predetermined time T simultaneously with the start of the aeration in the aeration tank 5 irrespective of the detection result of the flow detecting means 4.
【０００６】[0006]
【発明の実施の形態】以下、本発明の実施の形態を図面
に基づいて説明する。図１は浄化槽の概略断面図であ
る。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic sectional view of the septic tank.
【０００７】浄化槽は、例えば、ばっ気槽５と処理水槽
１とを備え、ばっ気槽５の前段として夾雑物除去槽６を
配置していて、例えば、トイレ、洗面、台所等からの生
活排水が夾雑物除去槽６に投入され、固形分が分離され
た後、被処理水としての汚水は、移送ポンプ７等によっ
てばっ気槽５へと移送される。The septic tank includes, for example, an aeration tank 5 and a treatment water tank 1, and an impurity removing tank 6 is disposed in front of the aeration tank 5. For example, domestic wastewater from toilets, washbasins, kitchens, and the like are provided. Is introduced into the impurity removing tank 6, and the solid content is separated. Then, the sewage as the water to be treated is transferred to the aeration tank 5 by the transfer pump 7 or the like.
【０００８】ばっ気槽５内には膜分離のための複数枚の
ろ過膜を備えた膜分離装置Ａと、ばっ気用の送風機８か
らの空気を吹き出す散気管９が備えられ、生物的分解の
ための微生物による活性汚泥処理と窒素除去のための間
欠ばっ気処理がおこなれるようになっている。すなわ
ち、活性汚泥による好気処理のために送風機８から空気
が送り込まれ、散気管９から吹き出されてばっ気処理が
おこなわれる。このばっ気工程では、汚水からの窒素を
最終的には窒素ガスとして除去するための一工程である
硝化がおこなわれる。次いで、散気管９からの空気の吹
き出しが停止されて非ばっ気状態となり、非ばっ気工程
として脱窒がおこなわれることになる。つまり窒素除去
は、ばっ気工程（硝化）と非ばっ気工程（脱窒）とを１
サイクルとして繰り返される。このようにして、間欠ば
っ気をおこなう活性汚泥ばっ気槽５では、汚水中の有機
物の分解と窒素除去がおこなわれることになる。The aeration tank 5 is provided with a membrane separation apparatus A having a plurality of filtration membranes for membrane separation, and an air diffusion pipe 9 for blowing air from an air blower 8 for biological decomposition. Activated sludge treatment by microorganisms and intermittent aeration treatment for nitrogen removal are performed. That is, air is blown in from the blower 8 for aerobic treatment by activated sludge, and blown out from the diffuser 9 to perform aeration. In this aeration step, nitrification, which is one step for finally removing nitrogen from wastewater as nitrogen gas, is performed. Next, the blowing of air from the air diffuser 9 is stopped, and a non-aerated state is established, and denitrification is performed as a non-aerated step. In other words, nitrogen removal involves one aeration step (nitrification) and one non-aeration step (denitrification).
It is repeated as a cycle. In this way, in the activated sludge aeration tank 5 that performs intermittent aeration, decomposition of organic matter in the sewage and nitrogen removal are performed.
【０００９】ばっ気工程と非ばっ気工程とからなる１サ
イクルの時間は、例えば約１〜２時間程度を目安とする
ことができ、各工程は、各々１５〜７５分間程度とする
ことができる。The time of one cycle consisting of the aeration step and the non-aeration step can be, for example, about 1 to 2 hours, and each step can be about 15 to 75 minutes. .
【００１０】同様に限定的なものではないが、活性汚泥
の濃度は、例えば約２，０００〜２０，０００（ｍｇ／
Ｌ）程度の範囲とすることができる。Similarly, without limitation, the concentration of activated sludge may be, for example, about 2,000 to 20,000 (mg / mg).
L).
【００１１】ばっ気槽５への汚泥の投入については、例
えば水位センサーＳ１によってばっ気槽５の設計最低水
位（ＬＷＬ：Ｌｏｗ Ｗａｔｅｒ Ｌｉｎｅ）を検知
し、移送ポンプ７を運転して汚水をばっ気槽５の設計最
高水位（ＨＷＬ：Ｈｉｇｈ Ｗａｔｅｒ Ｌｉｎｅ）に
まで投入することができる。このような投入のタイミン
グは、例えば、ばっ気槽５の水位が降下するばっ気工程
の後半、あるいはその終了後のばっ気工程の開始ととも
におこなわれるように考慮することができる。Regarding the introduction of sludge into the aeration tank 5, for example, a design water level (LWL: Low Water Line) of the aeration tank 5 is detected by the water level sensor S1, and the transfer pump 7 is operated to aerate the waste water. The tank 5 can be charged up to the design maximum water level (HWL: High Water Line). The timing of such charging can be considered, for example, so as to be performed in the latter half of the aeration step in which the water level of the aeration tank 5 drops, or together with the start of the aeration step after the end.
【００１２】なお、ばっ気槽５における非ばっ気工程で
は、槽内の攪拌のために、例えば５〜１５秒というきわ
めて短時間のばっ気を断続的におこなってもよい。こう
することが浄化にとって有効となる。In the non-aeration step in the aeration tank 5, an extremely short-time aeration of, for example, 5 to 15 seconds may be performed intermittently for stirring in the tank. This is effective for purification.
【００１３】ばっ気槽５の膜分離装置Ａにはろ液管１１
が接続され、水頭差Ｈによって膜分離装置Ａのろ過膜を
透過した処理水を処理水槽１に移送するようにしてい
る。The filtrate pipe 11 is connected to the membrane separation device A of the aeration tank 5.
Is connected, and the treated water that has passed through the filtration membrane of the membrane separation device A due to the head difference H is transferred to the treated water tank 1.
【００１４】ろ液管１１の下端を浄化槽の下端部まで下
ろし、そこから放流ポンプ２までの間の管路の途中に上
端が開放された処理水槽１を設け、水頭差サイホンを構
成している。吸引時には放流ポンプ２により所定量放流
さるとその量に応じた水頭差になるまで処理水槽１の水
位が下がり、そこでバランスする。なお定量にする手段
として流量の調整弁を設けるとよい。The lower end of the filtrate pipe 11 is lowered to the lower end of the septic tank, and a treated water tank 1 having an open upper end is provided in the middle of the pipeline from there to the discharge pump 2 to constitute a head difference siphon. . When a predetermined amount is discharged by the discharge pump 2 at the time of suction, the water level in the treated water tank 1 is lowered until the water head difference according to the amount is reached, and the water level is balanced there. Note that a flow rate adjusting valve may be provided as a means for determining the amount.
【００１５】しかして、ばっ気槽５の最低水位ＬＷＬに
達したことを例えばフロートセンサーや圧力センサーの
ような水位センサーＳ１により検出し、好気工程が終了
しなくても放流ポンプ２が停止し、ばっ気槽５と処理水
槽１との水位が一致した時点で膜透過が停止する。When the lowest level LWL of the aeration tank 5 has been reached, for example, it is detected by a water level sensor S1 such as a float sensor or a pressure sensor, and even if the aerobic process is not completed, the discharge pump 2 is stopped. The membrane permeation stops when the water levels in the aeration tank 5 and the treatment tank 1 match.
【００１６】放流ポンプ２以降の放流水路３に処理水の
流れを検出する流れ検出手段４としてのフロースイッチ
Ｓ３を設けてフロースイッチＳ３による検出結果に基づ
いて放流ポンプ２の駆動・停止をおこなうようにしてい
る。このようにフロースイッチＳ３の検出結果に基づい
て放流ポンプ２の駆動・停止をおこなう構成を制御手段
といいコントローラ（図示せず）に設けられている。A flow switch S3 as flow detection means 4 for detecting the flow of treated water is provided in the discharge water channel 3 after the discharge pump 2, and the discharge pump 2 is driven and stopped based on the detection result by the flow switch S3. I have to. The configuration for driving / stopping the discharge pump 2 based on the detection result of the flow switch S3 in this manner is referred to as control means and is provided in a controller (not shown).
【００１７】フロースイッチＳ３は図３に示すように、
放流水路３の一部を構成する管路体１０の内部にフラッ
パー１２を軸１３を介して揺動自在に保持し、フラッパ
ー１２に磁石１４ａを取付け、管路体１０の下部部分に
磁極を異ならせた磁石１４ｂを取付け、更に、管路体１
０の上部部分にリードスイッチ１５を設けてある。しか
して、放流水路３にある管路体１０に処理水が流れてい
る場合にフラッパー１２が持上げられて磁石１４ａがリ
ードスイッチ１５に検知されて放流ポンプ２の駆動状態
を維持するようにしてあり、又、放流水路３にある管路
体１０に処理水が流れていない場合にフラッパー１２が
下げられて磁石１４ａが管路体１０側の磁石１４ｂに吸
引されてリードスイッチ１５を確実にオフの状態にし
て、放流ポンプ２の駆動を停止するようにしている。The flow switch S3 is, as shown in FIG.
A flapper 12 is swingably held through a shaft 13 inside a pipe body 10 constituting a part of the discharge water channel 3, a magnet 14 a is attached to the flapper 12, and a magnetic pole is provided at a lower portion of the pipe body 10. The magnet 14b is attached, and the pipe body 1
A reed switch 15 is provided in the upper part of the zero. When the treated water is flowing through the pipe body 10 in the discharge water channel 3, the flapper 12 is lifted, the magnet 14a is detected by the reed switch 15, and the drive state of the discharge pump 2 is maintained. Also, when the treated water is not flowing into the pipe body 10 in the discharge water channel 3, the flapper 12 is lowered and the magnet 14a is attracted by the magnet 14b on the pipe body 10 side, and the reed switch 15 is turned off without fail. In this state, the driving of the discharge pump 2 is stopped.
【００１８】このように、放流ポンプ２の駆動・停止
は、放流水路３に処理水が流れていることの検出結果に
ておこなわれるのであり、即ち、放流水路３に処理水が
流れていなくて放流ポンプ２にエアー噛みが生じる虞が
ある場合には、放流ポンプ２の駆動を停止して放流ポン
プ２の損傷を回避するのである。As described above, the drive / stop of the discharge pump 2 is performed based on the detection result that the treated water is flowing in the discharge water channel 3, that is, when the treated water is not flowing in the discharge water channel 3. When there is a possibility that the discharge pump 2 may be caught in the air, the driving of the discharge pump 2 is stopped to avoid damage to the discharge pump 2.
【００１９】図３はフローチャートを示し、同図（ａ）
は正常動作を示し、放流ポンプ２を作動させて処理水槽
１の処理水を放流水路３を経て放流をおこなっている状
態で、ばっ気槽５の水位が設計最低水位ＬＷＬになると
水位センサーＳ１の水位検出結果にて放流ポンプ２の駆
動を停止し、放流水路３に処理水が流れなくなるとフロ
ースイッチＳ３がオフになるのである。同図において符
号Ｔは浄化槽の運転開始から所定時間にわたって放流ポ
ンプ２を駆動する制御工程を示し、放流ポンプ２を運転
開始から所定時間Ｔにわたって駆動することで、放流水
路３に処理水を流してフロースイッチＳ３をオンにし
て、放流ポンプ２の稼働を維持するのである。同図
（ｂ）は上記所定時間Ｔにわたって放流ポンプ２を駆動
した後に放流ポンプ２にトラブルが生じた場合を示して
いて、放流ポンプ２にトラブルが発生して放流量が減少
或いは放流ができなくなった場合にフロースイッチＳ３
がオフになって放流ポンプ２を停止させるのである。同
図（ｃ）は上記所定時間Ｔの経過前に放流ポンプ２にト
ラブルがあった場合を示していて、所定時間Ｔの経過前
に放流ポンプ２にトラブルが発生して放流量が減少或い
は放流ができなくなった場合にフロースイッチＳ３がオ
フになって放流ポンプ２を停止させるのである。このよ
うに、フロースイッチＳ３の検出結果にかかわらず放流
ポンプ２は、ばっ気槽５におけるばっ気開始と同時に所
定時間Ｔにわたって作動することが、浄化槽の運転シス
テムにおいて好ましいものである。FIG. 3 shows a flowchart, and FIG.
Indicates a normal operation. In a state where the discharge water is discharged from the treatment water tank 1 through the discharge water channel 3 by operating the discharge pump 2 and the water level of the aeration tank 5 reaches the design minimum water level LWL, the water level sensor S1 The drive of the discharge pump 2 is stopped based on the water level detection result, and when the treated water stops flowing into the discharge water channel 3, the flow switch S3 is turned off. In the figure, reference symbol T indicates a control step of driving the discharge pump 2 for a predetermined time from the start of operation of the septic tank, and by driving the discharge pump 2 for a predetermined time T from the start of operation, treated water flows through the discharge water channel 3. By turning on the flow switch S3, the operation of the discharge pump 2 is maintained. FIG. 4B shows a case where a trouble occurs in the discharge pump 2 after the discharge pump 2 has been driven for the predetermined time T. The trouble occurs in the discharge pump 2 and the discharge flow decreases or the discharge cannot be performed. Flow switch S3
Is turned off, and the discharge pump 2 is stopped. FIG. 3C shows a case where the discharge pump 2 has a trouble before the predetermined time T has elapsed, and a trouble occurs in the discharge pump 2 before the predetermined time T has elapsed, and the discharge flow rate is reduced or discharged. Is stopped, the flow switch S3 is turned off and the discharge pump 2 is stopped. Thus, regardless of the detection result of the flow switch S3, it is preferable that the discharge pump 2 operates for the predetermined time T at the same time as the start of the aeration in the aeration tank 5, in the operation system of the septic tank.
【００２０】[0020]
【発明の効果】請求項１においては、ばっ気槽に設けた
膜分離装置よりの処理水を処理水槽へと移流し、処理水
槽の処理水を放流ポンプによって放流水路へと放流する
浄化槽であって、放流水路に放流水路における処理水の
流れを検出する流れ検出手段を設け、流れ検出手段によ
る検出結果に基づいて放流ポンプの駆動・停止をおこな
う制御手段を備えているから、放流ポンプの駆動・停止
は、放流水路に処理水が流れていることの検出結果にて
おこなわれるのであり、つまり、放流水路に処理水が流
れていなくて放流ポンプにエアー噛みが生じる虞がある
場合には、放流ポンプの駆動を停止して放流ポンプの損
傷を回避することができるという利点がある。According to the first aspect of the present invention, there is provided a purification tank for transferring treated water from a membrane separation device provided in an aeration tank to a treated water tank and discharging the treated water from the treated water tank to a discharge water channel by a discharge pump. The discharge water channel is provided with flow detection means for detecting the flow of treated water in the discharge water channel, and the discharge water channel is provided with control means for driving and stopping the discharge pump based on the detection result by the flow detection device. Stopping is performed based on the detection result that the treated water is flowing in the discharge water channel, that is, when the treated water is not flowing in the discharge water channel and the discharge pump may be clogged with air, There is an advantage that the drive of the discharge pump can be stopped to avoid damage to the discharge pump.
【図１】本発明の浄化槽の実施の一形態を示す概略断面
図である。FIG. 1 is a schematic sectional view showing an embodiment of a septic tank according to the present invention.
【図２】同上の流れ検出手段であるフロースイッチを示
し、（ａ）は平面図、（ｂ）は正断面図、（ｃ）は側断
面図である。FIGS. 2A and 2B show a flow switch as a flow detecting means of the above, wherein FIG. 2A is a plan view, FIG. 2B is a front sectional view, and FIG.
【図３】（ａ）（ｂ）（ｃ）は同上のばっ気工程のフロ
ーチャートである。FIGS. 3 (a), 3 (b) and 3 (c) are flowcharts of an aeration step of the above.
１ 処理水槽 ２ 放流ポンプ ３ 放流水路 ４ 流れ検出手段 ５ ばっ気槽 DESCRIPTION OF SYMBOLS 1 Treatment water tank 2 Discharge pump 3 Discharge water channel 4 Flow detection means 5 Aeration tank
───────────────────────────────────────────────────── フロントページの続き (72)発明者 中岡 敬善 大阪府門真市大字門真1048番地松下電工株 式会社内 Ｆターム(参考） 4D006 GA02 HA93 KA12 KA44 KB22 PA01 PB08 PC65 4D027 AA01 AA16 4D028 BC17 BD08 BD17 CA00 CA09 CB03 CB08 CC00 CD05 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Takayoshi Nakaoka 1048 Oaza Kadoma, Kadoma-shi, Osaka F-term in Matsushita Electric Works Co., Ltd. CA00 CA09 CB03 CB08 CC00 CD05
Claims (2)
水を処理水槽へと移流し、処理水槽の処理水を放流ポン
プによって放流水路へと放流する浄化槽であって、放流
水路に放流水路における処理水の流れを検出する流れ検
出手段を設け、流れ検出手段による検出結果に基づいて
放流ポンプの駆動・停止をおこなう制御手段を備えて成
ることを特徴とする浄化槽。1. A purification tank for transferring treated water from a membrane separation device provided in an aeration tank to a treated water tank and discharging treated water in the treated water tank to a discharge water channel by a discharge pump, wherein the water is discharged to the discharge water channel. A septic tank, comprising: flow detection means for detecting a flow of treated water in a water channel; and control means for driving and stopping a discharge pump based on a detection result by the flow detection means.
流ポンプは、ばっ気槽におけるばっ気開始と同時に所定
時間作動するようにして成ることを特徴とする請求項１
記載の浄化槽。2. The discharge pump according to claim 1, wherein the discharge pump is operated for a predetermined time simultaneously with the start of the aeration in the aeration tank, irrespective of the detection result of the flow detection means.
The septic tank described.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11084995A JP2000279978A (en) | 1999-03-26 | 1999-03-26 | Septic tank |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11084995A JP2000279978A (en) | 1999-03-26 | 1999-03-26 | Septic tank |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000279978A true JP2000279978A (en) | 2000-10-10 |
Family
ID=13846225
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11084995A Withdrawn JP2000279978A (en) | 1999-03-26 | 1999-03-26 | Septic tank |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000279978A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003019481A (en) * | 2001-07-06 | 2003-01-21 | Asahi Kasei Corp | Method for managing liquid level of membrane separation apparatus |
| US6863817B2 (en) | 2002-12-05 | 2005-03-08 | Zenon Environmental Inc. | Membrane bioreactor, process and aerator |
| JP2008086991A (en) * | 2006-09-07 | 2008-04-17 | Nikko Co | Circulation type method and apparatus for treating human waste |
-
1999
- 1999-03-26 JP JP11084995A patent/JP2000279978A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003019481A (en) * | 2001-07-06 | 2003-01-21 | Asahi Kasei Corp | Method for managing liquid level of membrane separation apparatus |
| US6863817B2 (en) | 2002-12-05 | 2005-03-08 | Zenon Environmental Inc. | Membrane bioreactor, process and aerator |
| JP2008086991A (en) * | 2006-09-07 | 2008-04-17 | Nikko Co | Circulation type method and apparatus for treating human waste |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20060606 |