JP3707588B2 - Septic tank - Google Patents

Septic tank Download PDF

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Publication number
JP3707588B2
JP3707588B2 JP34769197A JP34769197A JP3707588B2 JP 3707588 B2 JP3707588 B2 JP 3707588B2 JP 34769197 A JP34769197 A JP 34769197A JP 34769197 A JP34769197 A JP 34769197A JP 3707588 B2 JP3707588 B2 JP 3707588B2
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Prior art keywords
tank
chamber
septic tank
membrane
treatment
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JPH11169872A (en
Inventor
孝 小和田
敏正 梅原
淳 日比野
力 石垣
康弘 石井
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株式会社日立ハウステック
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00Technologies for wastewater treatment
    • Y02W10/10Biological treatment of water, waste water, or sewage

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  • Separation Using Semi-Permeable Membranes (AREA)
  • Treatment Of Biological Wastes In General (AREA)
  • Activated Sludge Processes (AREA)

Description

【0001】
【発明の属する技術分野】
本発明は、既存の単独処理浄化槽に地上設置の膜処理槽を接続し、合併処理可能とした浄化槽に関する。
【0002】
【従来の技術】
従来からし尿浄化の方法として、単独処理浄化槽を用いる方法がある。図3を用いて前記単独処理浄化槽を説明すると、単独処理浄化槽は、流入口30を有する沈殿分離室31と、ばっ気室32と、沈殿室33と、流出口35を有する消毒槽34とをこの順番で連通させたもので、前記ばっ気室32には、好気処理を行うための接触材36と、該接触材36の下方から空気を吐出する散気管37と、接触材36を閉塞させないために定期的に強い空気流を接触材36に向けて吐出する逆洗管38とを備えている。
【0003】
浄化すべきし尿は、流入口30より沈殿分離室31に流入し、該沈殿分離室31にて固液分離を行った後、上澄み液がばっ気室32へと流入する。ばっ気室32に流入した上澄み液は、前記ばっ気室32に設置した接触材36に接触し、散気管37から吐出される空気により好機処理が行われ、該好機処理の後に沈殿室33に流入する。尚、接触材36は継続的に使用すると、生物膜が厚く堆積するために、定期的に逆洗管38から(散気管37から吐出するよりも大量の)空気を吐出させ、生物膜を剥離する。沈殿室33に流入した浄化水は、沈殿分離を行った後に、消毒槽34にて塩素剤による滅菌処理を行った後、流出口35から系外に放流される。
【0004】
前述した単独処理浄化槽は、し尿の浄化のみを行う浄化槽であるが、近年の環境問題に対応するため、家庭雑排水(台所水、風呂水等)及びし尿を同時に浄化処理する合併処理浄化槽も広く一般に使用されている。図4を用いて合併処理浄化槽の説明をすると、合併処理浄化槽は、流入口40を有した嫌気濾床槽第1室41と、嫌気濾床槽第2室43と、接触ばっ気室45と、沈殿室49と、流出口51を有した消毒槽50とをこの順番で連通させたもので、前記嫌気濾床槽第1室41及び嫌気濾床槽第2室43内部には、嫌気処理を行うための濾材42、44を各々配置し、前記接触ばっ気室45には、好気処理を行うための接触材46、該接触材46へ空気を吐出し好気状態を維持する散気管47、前記接触材46を閉塞させないための逆洗管48とを配置している。
【0005】
家庭雑排水及びし尿は、流入口40から嫌気濾床槽第1室41に流入し、濾材42を通過することにより、嫌気処理され栄養基質を除去される。更に、嫌気濾床槽第2室43においても濾材44を通過し嫌気処理を行った後、接触ばっ気室45へと流入する。接触ばっ気室45では、接触材46を通過することにより好気処理が行われ、その後沈殿室49にて沈殿分離が行われる。沈殿室49での上澄み液は、消毒槽50にて塩素剤による滅菌処理を行い、流出口51より系外へと放流される。
【0006】
【発明が解決しようとする課題】
前述したように、環境に対する配慮を強く求められる今日においては、単独処理浄化槽の使用よりも合併処理浄化槽を設置することが多く、単独処理浄化槽を設置することはあまり行われていない。しかし、既に単独処理浄化槽を設置している家庭にて合併処理を行なおうとした場合には、既設の単独処理浄化槽を廃棄し、新たに合併処理浄化槽を購入し、設置する必要がある。そして、新たな合併処理浄化槽の購入は、製品自体及び既設の単独処理浄化槽の掘り出し費用等を発生させ、更には、掘り出した単独処理浄化槽を廃棄するとの課題が出てくる。
【0007】
本発明は、前記課題に鑑みなされたものであり、既設の単独処理浄化槽を有効利用し、単独処理浄化槽を合併処理浄化槽の一部として使用することにより、単独処理浄化槽を廃棄するとの課題を解決し、新たに合併処理浄化槽を購入するよりも安価に合併処理浄化槽に改造することを目的とする。
【0008】
【課題を解決するための手段】
本発明は、沈殿分離室、ばっ気室、沈殿室、消毒槽を、この順番で連通させた地下埋設の単独処理浄化槽と、膜モジュール、該膜モジュールの下方に設置される散気管を有した地上設置される膜処理槽と、ばっ気室と膜処理槽とを配管接続する移送管と、膜モジュールと消毒槽とを配管接続する流出管と、膜処理槽底部と沈殿分離室とを配管接続する余剰汚泥返送管とを備えた浄化槽である。
また、余剰汚泥返送管が、その途中に膜処理槽内の汚泥含有量を調整する弁を有した浄化槽である。
更に、移送管が、膜処理槽の膜モジュール上面部よりも上方に接続された浄化槽である。
更に、ばっ気室が、水位センサを有した浄化槽である。
【0009】
【発明の実施の形態】
本発明に用いる膜モジュール8は、一般的な多孔性物質により形成されるものであり、具体的には、枠体の両面に多孔質ポリエチレンの膜を張り合わせたもの等が使用可能である。浄化は、多孔質ポリエチレンの膜を汚水が通過することにより固液分離を行い、固体はその場で好機処理される。
【0010】
移送管12は、既設の単独処理浄化槽7内のばっ気室3から膜処理槽10へポンプ11にて汚水を流入させるものであり、ばっ気室3内に水位センサ(図示省略)を設置した場合には、ばっ気室3の任意の水量で移送可能となる。移送管12と膜処理槽10との接続箇所は、特に限定されるものではないが、膜処理槽10の底部に汚泥を沈殿させるため、膜モジュール8の上面部よりも上方に接続し、落下する汚水が一旦膜モジュール8に降りかかるようにすることが好ましい。尚、ばっ気室3に図3に示す接触材36が設置されている場合には、これを取り除いても良い。即ち、ばっ気室3は、好機処理を行うために使用するものではなく、流量調整槽として使用することとなる。
【0011】
流出管13は、膜モジュール8を通過した処理水を消毒槽5へ流入させるものであり、該流入は、その水頭差(膜モジュール8が地上設置であり、消毒槽5が地中設置であるため、必ず水位の高低差がある)によって行うため、ポンプ等を設けなくとも自然に移流する。
【0012】
余剰汚泥返送管15は、その途中に弁14を有しており、該弁14の開閉により膜処理槽10内の汚泥含有量を調整する。該汚泥の流出も、前述した流出管13と同様に、水頭差によって弁14を開弁することにより自然に行われるものである。
【0013】
【実施例】
以下図面を用いて、本発明の実施例を説明する。図1は、本発明の浄化槽を示す模式図であり、既設の単独処理浄化槽7に対して膜処理槽10を配管接続している。該配管接続は、3箇所にて行われるものであり、該3箇所は、1つ目がばっ気室3と膜処理槽10、2つ目が膜モジュール8と消毒槽5、3つ目が膜処理槽10底部と沈殿分離室2となっている。
【0014】
次に汚水浄化の流れを説明すると、生活雑排水及びし尿は、配管16、17から流入口1を介して沈殿分離室2に流入し、該沈殿分離室2にて汚水の沈殿分離が行われる。沈殿分離した後の上澄み液は、ばっ気室3へと流入し、ポンプ11により移送管12を介して膜処理槽10へ流入させるまで貯留させる。この際、ばっ気室3は、上澄み液の流量調整槽として機能するものであり、単独処理浄化槽として機能していた好機処理を行う必要はない。
【0015】
膜処理槽10は、図2に示すように、内部に膜モジュール8及び散気管9を内蔵しており、前記膜処理槽10上方に接続した移送管12から膜処理槽10に流入した上澄み液は、膜モジュール8にてミクロンサイズの固液分離を行い、流出管13より分離した処理水を図1に示す消毒槽5へと移流させる。そして、消毒槽5に移流させた処理水は、塩素剤により滅菌処理を施した後に、流出口6より系外に放流される。
【0016】
前記膜モジュール8にて消毒槽5へと移流しない固形分(汚泥)は、膜モジュール8下方に設置した散気管9からの空気供給を受け、好機処理が行われる。前記空気の供給は、散気管9に接続したブロワ18により行い、運転時間は、タイマ19により予め設定しておく。但し、全ての汚泥が好機処理により分解されることは少ないので、膜処理槽10底部に沈殿した汚泥(余剰汚泥)は、弁14を開弁し、余剰汚泥返送管15により、図1に示す沈殿分離室2へと移送する。尚、沈殿分離室2内の汚泥が、必要以上に蓄積された場合には、マンホール20より汚泥を吸引する必要があるが、吸引の頻度は1回/年程度であるので使用者の負担になることはない。
【0017】
【発明の効果】
本発明では、既設の単独処理浄化槽を沈殿分離室及び流量調整槽として有効活用することにより、地上に膜処理槽を付設するだけで、合併処理を可能としているため、単独処理浄化槽を廃棄する必要がなく、新規に合併処理浄化槽を購入する必要もなくなる。そして、地中を掘り起こすのは、配管部分だけであるため、合併処理浄化槽を埋設する工事費用に比較し、安価な設置費用となる。
【0018】
更に、本発明の浄化槽は、膜処理槽を地上設置にしているため、膜モジュールを交換する必要があっても、容易に交換作業を行うことが可能となる。
【図面の簡単な説明】
【図1】本発明の実施例である、浄化槽の模式図を示す。
【図2】本発明の浄化槽に使用する膜処理槽部分の拡大図を示す。
【図3】従来使用していた単独処理浄化槽の断面図を示す。
【図4】従来使用していた合併処理浄化槽の断面図を示す。
【符号の説明】
1.流入口 2.沈殿分離室 3.ばっ気室 4.沈殿室 5.消毒槽 6.流出口 7.単独処理浄化槽 8.膜モジュール 9.散気管 10.膜処理槽 11.ポンプ 12.移送管 13.流出管 14.弁 15.余剰汚泥返送管16.配管 17.配管 18.ブロワ 19.タイマ 20.マンホール 30.流入口 31.沈殿分離室 32.ばっ気室 33.沈殿室 34.消毒槽 35.流出口 36.接触材 37.散気管 38.逆洗管 40.流入口41.嫌気濾床槽第1室 42.濾材 43.嫌気濾床槽第2室 44.濾材45.接触ばっ気室 46.接触材 47.散気管 48.逆洗管 49.沈殿室 50.消毒槽 51.流出口
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a septic tank in which a membrane processing tank installed on the ground is connected to an existing single-processing septic tank and can be merged.
[0002]
[Prior art]
As a conventional method for purifying human waste, there is a method using a single treatment septic tank. The single treatment septic tank will be described with reference to FIG. 3. The single treatment septic tank comprises a precipitation separation chamber 31 having an inlet 30, an aeration chamber 32, a precipitation chamber 33, and a disinfection tank 34 having an outlet 35. In this aeration chamber 32, the aeration chamber 32 is closed with a contact material 36 for performing an aerobic treatment, a diffuser pipe 37 for discharging air from below the contact material 36, and the contact material 36. In order to prevent this from happening, a backwash pipe 38 that periodically discharges a strong air flow toward the contact member 36 is provided.
[0003]
The urine to be purified flows into the precipitation separation chamber 31 from the inlet 30, and after solid-liquid separation in the precipitation separation chamber 31, the supernatant liquid flows into the aeration chamber 32. The supernatant liquid that has flowed into the aeration chamber 32 comes into contact with the contact material 36 installed in the aeration chamber 32 and is subjected to an opportunity treatment by the air discharged from the diffuser pipe 37. After the opportunity treatment, the supernatant liquid enters the precipitation chamber 33. Inflow. If the contact material 36 is continuously used, the biofilm accumulates thickly. Therefore, air is periodically discharged from the backwash tube 38 (a larger amount than that discharged from the air diffuser tube 37) to peel off the biofilm. To do. The purified water that has flowed into the sedimentation chamber 33 is separated from the precipitate, sterilized with a chlorine agent in the disinfection tank 34, and then discharged out of the system from the outlet 35.
[0004]
The single treatment septic tank described above is a septic tank that only purifies human waste, but in order to respond to environmental problems in recent years, there are also a wide range of combined treatment septic tanks that simultaneously purify household wastewater (kitchen water, bath water, etc.) and human waste. Generally used. The merged treatment septic tank will be described with reference to FIG. 4. The merged treatment septic tank includes an anaerobic filter bed tank first chamber 41 having an inlet 40, an anaerobic filter bed tank second chamber 43, and a contact aeration chamber 45. The sedimentation chamber 49 and the disinfection tank 50 having the outlet 51 are communicated in this order. The anaerobic filter bed tank first chamber 41 and the anaerobic filter bed tank second chamber 43 have an anaerobic treatment. Filter medium 42 and 44 are disposed respectively, and in the contact aeration chamber 45, a contact material 46 for performing an aerobic treatment, and an air diffuser for discharging air to the contact material 46 and maintaining an aerobic state 47, and a backwash pipe 48 for preventing the contact material 46 from being blocked.
[0005]
Household wastewater and human waste flow into the first chamber 41 of the anaerobic filter bed from the inlet 40 and pass through the filter medium 42 to be anaerobically treated to remove the nutrient substrate. Further, in the second chamber 43 of the anaerobic filter bed, after passing through the filter medium 44 and performing anaerobic treatment, it flows into the contact aeration chamber 45. In the contact aeration chamber 45, aerobic treatment is performed by passing through the contact material 46, and then precipitation separation is performed in the precipitation chamber 49. The supernatant liquid in the sedimentation chamber 49 is sterilized with a chlorine agent in the disinfection tank 50 and discharged from the outlet 51 to the outside of the system.
[0006]
[Problems to be solved by the invention]
As described above, in today's environment where consideration for the environment is strongly demanded, a combined treatment septic tank is often installed rather than the use of a single treatment septic tank, and a single treatment septic tank is not often installed. However, when it is going to perform merger processing in the home which has already installed the independent processing septic tank, it is necessary to discard the existing independent processing septic tank, and purchase and install a new combined processing septic tank. Then, the purchase of a new merged treatment septic tank raises the cost of digging up the product itself and the existing single treatment septic tank, and further, the problem arises that the excavated single treatment septic tank is discarded.
[0007]
The present invention has been made in view of the above problems, and solves the problem of discarding a single treatment septic tank by effectively using an existing single treatment septic tank and using the single treatment septic tank as a part of a combined processing septic tank. The purpose is to convert to a merged processing septic tank at a lower cost than purchasing a new merged processing septic tank.
[0008]
[Means for Solving the Problems]
The present invention has an underground buried single-treatment septic tank in which a sedimentation separation chamber, an aeration chamber, a sedimentation chamber, and a disinfection tank are communicated in this order, a membrane module, and an air diffuser installed below the membrane module. Membrane treatment tank installed on the ground, a transfer pipe connecting the aeration chamber and the membrane treatment tank, a discharge pipe connecting the membrane module and the disinfection tank, a bottom of the membrane treatment tank, and a precipitation separation chamber It is a septic tank provided with the surplus sludge return pipe to be connected.
Moreover, the surplus sludge return pipe | tube is a septic tank which had the valve which adjusts the sludge content in a membrane processing tank in the middle.
Furthermore, the transfer pipe is a septic tank connected above the upper surface of the membrane module of the membrane treatment tank.
Further, the aeration chamber is a septic tank having a water level sensor.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
The membrane module 8 used in the present invention is formed of a general porous material, and specifically, a membrane in which a porous polyethylene membrane is bonded to both sides of a frame can be used. Purification involves solid-liquid separation by passing sewage through a porous polyethylene membrane, and the solid is treated in an opportunity.
[0010]
The transfer pipe 12 is used to allow the sewage to flow into the membrane treatment tank 10 from the aeration chamber 3 in the existing single treatment purification tank 7 by a pump 11, and a water level sensor (not shown) is installed in the aeration chamber 3. In this case, it can be transferred with an arbitrary amount of water in the aeration chamber 3. Although the connection location of the transfer pipe 12 and the membrane treatment tank 10 is not particularly limited, in order to precipitate sludge at the bottom of the membrane treatment tank 10, it is connected above the upper surface of the membrane module 8 and dropped. It is preferable that the sewage to be poured once falls on the membrane module 8. In addition, when the contact material 36 shown in FIG. 3 is installed in the aeration chamber 3, this may be removed. That is, the aeration chamber 3 is not used for performing the opportunity process, but is used as a flow rate adjusting tank.
[0011]
The outflow pipe 13 allows the treated water that has passed through the membrane module 8 to flow into the disinfection tank 5, and the inflow is caused by the difference in water head (the membrane module 8 is installed on the ground and the disinfection tank 5 is installed underground). Therefore, there is always a difference in the level of the water level), so the advection will naturally occur without a pump.
[0012]
The surplus sludge return pipe 15 has a valve 14 in the middle thereof, and the sludge content in the membrane treatment tank 10 is adjusted by opening and closing the valve 14. Similarly to the above-described outflow pipe 13, the outflow of the sludge is naturally performed by opening the valve 14 by a water head difference.
[0013]
【Example】
Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic view showing a septic tank of the present invention, in which a membrane treatment tank 10 is connected to an existing single processing septic tank 7 by piping. The pipe connection is performed at three locations, the first being the aeration chamber 3 and the membrane treatment tank 10, the second being the membrane module 8 and the disinfection tank 5, and the third being The bottom of the membrane treatment tank 10 and the precipitation separation chamber 2 are provided.
[0014]
Next, the flow of sewage purification will be described. Domestic wastewater and human wastewater flow into the sedimentation separation chamber 2 from the pipes 16 and 17 through the inlet 1, and sedimentation separation of sewage is performed in the sedimentation separation chamber 2. . The supernatant liquid after the precipitation separation flows into the aeration chamber 3 and is stored until it flows into the membrane treatment tank 10 via the transfer pipe 12 by the pump 11. At this time, the aeration chamber 3 functions as a flow rate adjustment tank of the supernatant liquid, and it is not necessary to perform an opportunity process that has functioned as a single process purification tank.
[0015]
As shown in FIG. 2, the membrane treatment tank 10 contains a membrane module 8 and a diffuser tube 9 inside, and a supernatant liquid flows into the membrane treatment tank 10 from a transfer pipe 12 connected above the membrane treatment tank 10. Performs micron-size solid-liquid separation in the membrane module 8 and transfers the treated water separated from the outflow pipe 13 to the disinfection tank 5 shown in FIG. The treated water transferred to the disinfection tank 5 is sterilized with a chlorine agent and then discharged out of the system from the outlet 6.
[0016]
Solid matter (sludge) that is not transferred to the disinfection tank 5 by the membrane module 8 is supplied with air from the air diffuser 9 installed below the membrane module 8 and is subjected to opportunity processing. The supply of air is performed by a blower 18 connected to the diffuser tube 9, and the operation time is preset by a timer 19. However, since all sludge is rarely decomposed by the opportunity treatment, the sludge settled on the bottom of the membrane treatment tank 10 (excess sludge) opens the valve 14 and is shown in FIG. 1 by the surplus sludge return pipe 15. Transfer to sedimentation separation chamber 2. In addition, when the sludge in the sedimentation separation chamber 2 is accumulated more than necessary, it is necessary to suck the sludge from the manhole 20, but since the suction frequency is about once / year, it is a burden on the user. Never become.
[0017]
【The invention's effect】
In the present invention, the existing single-treatment septic tank is effectively utilized as a sedimentation separation chamber and a flow rate adjustment tank, so that it is possible to perform merger processing only by attaching a membrane treatment tank on the ground. There is no need to purchase a new merged septic tank. And since it is only the piping part that digs up underground, the installation cost is low compared to the construction cost for burying the merged treatment septic tank.
[0018]
Further, since the septic tank of the present invention has the membrane treatment tank installed on the ground, even if it is necessary to replace the membrane module, the replacement work can be easily performed.
[Brief description of the drawings]
FIG. 1 is a schematic view of a septic tank, which is an embodiment of the present invention.
FIG. 2 shows an enlarged view of a membrane treatment tank used in the septic tank of the present invention.
FIG. 3 is a sectional view of a single treatment septic tank that has been conventionally used.
FIG. 4 is a cross-sectional view of a merged treatment septic tank that has been conventionally used.
[Explanation of symbols]
1. Inlet 2. 2. Precipitation separation chamber Aeration room 4. 4. Precipitation chamber Disinfection tank 6. Outlet 7. Single treatment septic tank 8. 8. Membrane module Air diffuser 10. Membrane treatment tank 11. Pump 12. Transfer tube 13. Outflow pipe 14. Valve 15. Surplus sludge return pipe 16. Piping 17. Piping 18. Blower 19. Timer 20. Manhole 30. Inlet 31. Precipitation separation chamber 32. Aeration chamber 33. Settling chamber 34. Disinfection tank 35. Outlet 36. Contact material 37. Air diffuser 38. Backwash tube 40. Inlet 41. Anaerobic filter bed first chamber 42. Filter medium 43. Anaerobic filter bed second chamber 44. Filter medium 45. Contact aeration chamber 46. Contact material 47. Air diffuser 48. Backwash tube 49. Precipitation chamber 50. Disinfection tank 51. Outlet

Claims (4)

沈殿分離室、ばっ気室、沈殿室、消毒槽を、この順番で連通させた地下埋設の単独処理浄化槽と、膜モジュール、該膜モジュールの下方に設置される散気管を有した地上設置される膜処理槽と、ばっ気室と膜処理槽とを配管接続する移送管と、膜モジュールと消毒槽とを配管接続する流出管と、膜処理槽底部と沈殿分離室とを配管接続する余剰汚泥返送管とを備えた浄化槽。 A single-site underground septic tank with a sedimentation separation chamber, an aeration chamber, a sedimentation chamber, and a disinfection tank in this order, a membrane module, and a ground installation with a diffuser installed below the membrane module Excess sludge that connects the membrane treatment tank, the transfer pipe that connects the aeration chamber and the membrane treatment tank, the outflow pipe that connects the membrane module and the disinfection tank, and the bottom of the membrane treatment tank and the precipitation separation chamber A septic tank with a return pipe . 請求項1において、余剰汚泥返送管が、その途中に膜処理槽内の汚泥含有量を調整する弁を有した浄化槽。The septic tank according to claim 1, wherein the surplus sludge return pipe has a valve for adjusting the sludge content in the membrane treatment tank in the middle thereof. 請求項1又は2において、移送管が、膜処理槽の膜モジュール上面部よりも上方に接続された浄化槽。The septic tank according to claim 1 or 2, wherein the transfer pipe is connected above the upper surface of the membrane module of the membrane treatment tank. 請求項1乃至3のいずれかにおいて、ばっ気室が、水位センサを有した浄化槽。4. The septic tank according to claim 1, wherein the aeration chamber has a water level sensor.
JP34769197A 1997-12-17 1997-12-17 Septic tank Expired - Lifetime JP3707588B2 (en)

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JP34769197A JP3707588B2 (en) 1997-12-17 1997-12-17 Septic tank

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Application Number Priority Date Filing Date Title
JP34769197A JP3707588B2 (en) 1997-12-17 1997-12-17 Septic tank

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JPH11169872A JPH11169872A (en) 1999-06-29
JP3707588B2 true JP3707588B2 (en) 2005-10-19

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JP34769197A Expired - Lifetime JP3707588B2 (en) 1997-12-17 1997-12-17 Septic tank

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Publication number Priority date Publication date Assignee Title
JP5000594B2 (en) * 2008-07-07 2012-08-15 株式会社ハウステック Merger processing septic tank
CN106145494B (en) * 2016-07-20 2018-11-06 宜兴市创新环保有限公司 A kind of underground sewage disposal system ground integrated apparatus

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