JP4702750B2 - Water treatment equipment - Google Patents

Water treatment equipment Download PDF

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JP4702750B2
JP4702750B2 JP2006187615A JP2006187615A JP4702750B2 JP 4702750 B2 JP4702750 B2 JP 4702750B2 JP 2006187615 A JP2006187615 A JP 2006187615A JP 2006187615 A JP2006187615 A JP 2006187615A JP 4702750 B2 JP4702750 B2 JP 4702750B2
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tank
solid
liquid separation
aerobic
water
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JP2008012467A (en
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淳 日比野
宏 山下
栄一 鈴木
圭治 手塚
剛 市成
洋輔 田畑
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FUJICLEAN CO., LTD.
Housetec Inc
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Housetec Inc
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    • 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
    • Y02W10/20—Sludge processing

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Description

本発明は、一般家庭等から排出される生活雑排水を処理する水処理装置に関し、詳しくは汚泥を好気消化する機能を有する水処理装置に関する。   The present invention relates to a water treatment apparatus for treating household wastewater discharged from general households and the like, and more particularly to a water treatment apparatus having a function of aerobically digesting sludge.

一般家庭等から排出される生活雑排水を処理する水処理装置は、広く普及しているが、設置場所を制限されることから小型化が望まれている。水処理装置の小型化のためには、前処理部分である汚泥貯留部を小型化することが重要であり、そのためには汚泥を消化し汚泥容量を減量することがなされている。汚泥の好気消化については例えば、特許文献１に開示されている。   Water treatment apparatuses for treating household wastewater discharged from ordinary households are widely used, but downsizing is desired because the installation location is limited. In order to reduce the size of the water treatment apparatus, it is important to reduce the size of the sludge storage part, which is a pretreatment part, and for that purpose, the sludge is digested to reduce the sludge capacity. For example, Patent Document 1 discloses aerobic digestion of sludge.

特許文献１では、浄化すべき排水が、固液分離槽、好気性生物処理槽、濾過槽の順番で移流し、各々の槽より汚泥消化槽へと、汚泥を移送する。即ち、特許文献１では、汚水処理部と、汚泥処理部とを独立して設けることにより、汚水処理の安定化を確保し、汚泥の減量化を行っている。
特開２００１−３１０１９４ In Patent Document 1, wastewater to be purified is transferred in the order of a solid-liquid separation tank, an aerobic biological treatment tank, and a filtration tank, and sludge is transferred from each tank to a sludge digestion tank. That is, in Patent Document 1, by providing a sewage treatment unit and a sludge treatment unit independently, stabilization of sewage treatment is ensured and sludge is reduced.
JP 2001-310194 A

しかしながら、特許文献１に記載されるものは、汚泥を消化するために、固液分離部と好気消化部とを機能分離して設け、間欠ばっ気により好気性消化を図る方法である。
このような方法は、固液分離部と好気消化部の容量のバランスが難しく、好気消化部の滞留時間を十分に取ろうとすれば、固液分離部の滞留時間が十分に取れず、逆に固液分離部の滞留時間を十分に取ろうとすれば、好気消化部の滞留時間が十分に取れないという問題があった。 However, what is described in Patent Document 1 is a method in which a solid-liquid separation part and an aerobic digestion part are functionally separated to digest sludge, and aerobic digestion is achieved by intermittent aeration.
In such a method, it is difficult to balance the volume of the solid-liquid separation part and the aerobic digestion part, and if the residence time of the aerobic digestion part is sufficiently taken, the residence time of the solid-liquid separation part cannot be taken sufficiently, On the contrary, if the residence time of the solid-liquid separation part is taken sufficiently, there is a problem that the residence time of the aerobic digestion part cannot be taken sufficiently.

本発明は、上記問題点を鑑みてなされたものであり、好気消化槽の処理能力を十分に活かした水処理装置を提供することを目的とする。   This invention is made | formed in view of the said problem, and it aims at providing the water treatment apparatus which fully utilized the processing capacity of the aerobic digester.

本発明は、以下のものに関する。
（１）固液分離槽と、この固液分離槽にて分離された固形物又は汚泥を好気消化する好気消化槽と、この好気消化槽に設けられる散気装置と、上記固液分離槽よりも下流に設けられる嫌気処理槽とを備え、上記嫌気処理槽での処理水の一部を上記好気消化槽へと移送する第１移送手段を有する水処理装置。
（２）項（１）において、第１移送手段が、嫌気処理槽での処理水を下流へと移送する第２移送手段と兼用される水処理装置。
（３）項（１）又は（２）において、第１又は第２の移送手段が、流量調整ポンプである水処理装置。 The present invention relates to the following.
(1) A solid-liquid separation tank, an aerobic digestion tank for aerobic digestion of solids or sludge separated in the solid-liquid separation tank, an air diffuser provided in the aerobic digestion tank, and the solid liquid A water treatment apparatus comprising: an anaerobic treatment tank provided downstream of the separation tank, and having a first transfer means for transferring a part of the treated water in the anaerobic treatment tank to the aerobic digestion tank.
(2) The water treatment device according to item (1), wherein the first transfer means is also used as the second transfer means for transferring the treated water in the anaerobic treatment tank downstream.
(3) The water treatment device according to item (1) or (2), wherein the first or second transfer means is a flow rate adjusting pump.

本発明によれば、好気消化槽の処理能力を十分に活かした水処理装置を提供することができる。
また、第１移送手段と、第２移送手段とを兼用した場合、移送手段の設置スペースを小さくすることができ、コストの削減ができるばかりでなく、維持管理も行いやすくなる。
更に、第２移送手段が、流量調整ポンプであれば、流量調整マス（分水計量マス）からの余剰水を第１移送手段の移送水として流用できるため、動力が軽減できる。 ADVANTAGE OF THE INVENTION According to this invention, the water treatment apparatus which fully utilized the processing capacity of the aerobic digester can be provided.
Further, when the first transfer means and the second transfer means are combined, the installation space for the transfer means can be reduced, and not only the cost can be reduced, but also maintenance and management can be easily performed.
Further, if the second transfer means is a flow rate adjustment pump, surplus water from the flow rate adjustment mass (diversion metering mass) can be used as transfer water for the first transfer means, so that power can be reduced.

本発明にて述べる固液分離槽は、固液分離機能を有していれば特に制限されるものでなく、濾床の有無を問わない。濾床を有する場合は、板状、網様板状、網様円筒状、骨格様球状等の濾材を用いることができる。
固液分離槽では、処理が進むにつれ、固液分離作用により上部が上澄水、下部が汚泥に分離され、下部の沈殿汚泥はやがてスカムとなって浮上する。 The solid-liquid separation tank described in the present invention is not particularly limited as long as it has a solid-liquid separation function, and may or may not have a filter bed. In the case of having a filter bed, filter media such as a plate shape, a net-like plate shape, a net-like cylindrical shape, and a skeleton-like spherical shape can be used.
In the solid-liquid separation tank, as the process proceeds, the upper part is separated into supernatant water and the lower part is separated into sludge by the solid-liquid separation action, and the precipitated sludge in the lower part eventually rises as scum.

本発明にて述べる好気消化槽は、散気装置を備える。固液分離槽と好気消化槽は、連通しており、一方向でも双方向でも水の移流があれば、連通手段を制限するものはない。例えば、固液分離槽と、好気消化槽とを仕切る板に、移流口を設けただけのもの、移流パイプ、移送ポンプ等により移流させるものがある。   The aerobic digester described in the present invention includes an aeration device. The solid-liquid separation tank and the aerobic digestion tank communicate with each other, and there is nothing to limit the communication means as long as there is water advection in one direction or both directions. For example, there are a plate that separates a solid-liquid separation tank and an aerobic digestion tank, and a plate that is provided with a transfer port, and a plate that is transferred by a transfer pipe, a transfer pump, or the like.

本発明にて述べる好気消化槽は、槽内の一部または全部を好気性に保つことができれば特に制限されるものでなく、濾床の有無を問わない。
濾床を設ける場合は、濾床内を好気状態に保つことができるように、散気装置の上方に設けることが望ましい。濾床には微生物が着床し生物膜となり、汚泥中の有機物を分解し消化する。処理が進むにつれ生物膜は肥厚し、一部の生物膜は嫌気状態となり、嫌気消化も同時に進行する。濾床は流動床にすることもできるが、清掃時に濾床内の消化汚泥を引抜き易いように固定床としたほうがよい。 The aerobic digestion tank described in the present invention is not particularly limited as long as a part or all of the inside of the tank can be kept aerobic.
When providing a filter bed, it is desirable to provide it above the air diffuser so that the inside of the filter bed can be maintained in an aerobic state. Microbes settle on the filter bed to form a biofilm, which decomposes and digests organic matter in the sludge. As treatment progresses, the biofilm thickens, some biofilms become anaerobic, and anaerobic digestion proceeds simultaneously. The filter bed can be a fluidized bed, but it is better to use a fixed bed so that the digested sludge in the filter bed can be easily pulled out during cleaning.

本発明にて述べる散気装置は、好気消化槽に設置される。散気装置は、酸素溶解効率を上げるため、好気消化部の底部近傍に設置することが望ましく、少風量でも効率よく好気性消化が可能となる。更に底部近傍に設置することで水流も早くなるため、底部に死水域ができることを防止できる。   The air diffuser described in the present invention is installed in an aerobic digester. The air diffuser is desirably installed in the vicinity of the bottom of the aerobic digestion section in order to increase the oxygen dissolution efficiency, and enables aerobic digestion efficiently even with a small amount of air. Furthermore, since the water flow is accelerated by installing it near the bottom, it is possible to prevent a dead water area from being formed at the bottom.

本発明にて述べる嫌気処理槽は、嫌気性の処理機能を有している槽であれば特に制限されるものでなく、具体的には、沈殿分離槽、嫌気濾床槽等を用いることができる。
嫌気処理槽は、固液分離槽からの移流水に含まれる有機物を嫌気処理し、固液分離された上澄水を後段に移送する。一方、固液分離された汚泥は嫌気消化される。 The anaerobic treatment tank described in the present invention is not particularly limited as long as it has an anaerobic treatment function. Specifically, a precipitation separation tank, an anaerobic filter bed tank, or the like may be used. it can.
An anaerobic treatment tank carries out the anaerobic process of the organic substance contained in the advection water from a solid-liquid separation tank, and transfers the supernatant water separated into solid and liquid to a back | latter stage. On the other hand, sludge separated into solid and liquid is subjected to anaerobic digestion.

本発明にて述べる第1移送手段は、嫌気処理槽の処理水を好気消化槽へと移送可能であれば特に制限されるものではなく、具体的には、エアリフトポンプが好適に用いられる。
水の移送は、常時でも間欠でもよいが、移送水量は日平均汚水（流入）量Ｑに対して、１Ｑ〜４Ｑ、望ましくは２Ｑ〜３Ｑの範囲がよい。これは、移送水量が少な過ぎる場合には、十分に好気消化槽での処理能力を活かしきれず、多過ぎる場合には、好気消化部から固液分離部への移流量過多になるため、固液分離性能に悪影響を与え、汚泥が分離しきれず嫌気処理槽に流出してしまう恐れがあるためである。
固液分離部で分離された上澄水は、嫌気処理槽にて嫌気処理された後、好気消化部に移送すされることにより、再度好気消化され、好気消化槽での処理効率が上昇する。 The first transfer means described in the present invention is not particularly limited as long as the treated water in the anaerobic treatment tank can be transferred to the aerobic digestion tank. Specifically, an air lift pump is preferably used.
The transfer of water may be always or intermittently, but the transfer water amount is in the range of 1Q to 4Q, preferably 2Q to 3Q with respect to the daily average sewage (inflow) amount Q. This is because if the amount of water transferred is too small, the processing capacity in the aerobic digester cannot be fully utilized, and if it is too much, the transfer flow rate from the aerobic digestion section to the solid-liquid separation section will be excessive. This is because the solid-liquid separation performance is adversely affected and the sludge cannot be completely separated and may flow into the anaerobic treatment tank.
The supernatant water separated in the solid-liquid separation part is anaerobically treated in the anaerobic treatment tank and then transferred to the aerobic digestion part, where it is aerobically digested again, increasing the treatment efficiency in the aerobic digestion tank To do.

本発明にて述べる流量調整ポンプは、多大な流入ピークを緩和するための流量調整装置のひとつである。
流量調整装置は、例えば、流量調整部、流量調整ポンプ、流量調整マスにて構成される。流量調整部は流入した汚水を一時的に貯留しておく空間であり、嫌気処理槽上部をその空間に充てることができる。なお、好気消化部上部、固液分離部上部もその空間に充てることができる。流量調整ポンプは、流量調整部から流量調整マスへと汚水を汲み上げるポンプであり、具体的にはエアリフトポンプが好適に用いられる。流量調整マスは一定量を後段に送水させるための分水計量マスであり、余剰水は戻される。 The flow rate adjusting pump described in the present invention is one of flow rate adjusting devices for relaxing a large inflow peak.
The flow rate adjusting device includes, for example, a flow rate adjusting unit, a flow rate adjusting pump, and a flow rate adjusting mass. The flow rate adjusting unit is a space for temporarily storing the inflowing sewage, and the upper part of the anaerobic treatment tank can be used for the space. The upper part of the aerobic digestion part and the upper part of the solid-liquid separation part can also be used in the space. The flow rate adjusting pump is a pump that pumps up sewage from the flow rate adjusting unit to the flow rate adjusting mass, and specifically, an air lift pump is preferably used. The flow rate adjusting mass is a diversion measuring mass for sending a certain amount of water to the subsequent stage, and surplus water is returned.

第１移送手段と、第２移送手段とは、兼用することができる。両者とも嫌気処理槽の処理水を汲み上げる機能は同じである。また、流量調整マスも同様に兼用できる。汲み上げた汚水は流量調整マスによって一定量を、一方は後段の槽に、一方は好気消化部に移送される。   The first transfer means and the second transfer means can be combined. Both have the same function of pumping up the treated water from the anaerobic tank. Further, the flow rate adjusting mass can be used in the same manner. A certain amount of the sewage pumped up is transferred by the flow control mass, one to the subsequent tank, and the other to the aerobic digester.

以下、本発明の実施例を図面により説明する。図１は本発明に係る１つの実施例である水処理装置の概略立面図である。
水処理装置１は、好気消化部２５、嫌気処理槽３０および好気処理槽(図示略)を有している。また、好気消化部２５は、固液分離槽１０と、好気消化槽２０と、散気装置２１とを有している。
初めに、汚水は流入口２を通って固液分離槽１０に流れ込む。流入先は、嫌気処理槽３０でもよい。流れ込んだ汚水は、固液分離槽１０にて沈殿分離作用により、汚水中の固形物が分離される。分離された固形物は固液分離槽１０と、好気消化槽２０とを区切る仕切板１３下部の連通部１１から好気消化槽２０へと送られる。仕切板１３の下部は、ホッパー構造となっており、分離された固形物が集まり易い構造となっている。 Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic elevation view of a water treatment apparatus according to one embodiment of the present invention.
The water treatment apparatus 1 includes an aerobic digester 25, an anaerobic treatment tank 30, and an aerobic treatment tank (not shown). The aerobic digestion unit 25 includes a solid-liquid separation tank 10, an aerobic digestion tank 20, and an air diffuser 21.
First, sewage flows into the solid-liquid separation tank 10 through the inlet 2. The inflow destination may be the anaerobic treatment tank 30. From the sewage that has flowed in, solid matter in the sewage is separated by the precipitation separation action in the solid-liquid separation tank 10. The separated solid matter is sent to the aerobic digester 20 from the communicating portion 11 at the lower part of the partition plate 13 that separates the solid-liquid separator 10 and the aerobic digester 20. The lower part of the partition plate 13 has a hopper structure, and the separated solid matter is easily collected.

好気消化槽２０には、散気装置２１が、連通部１１下方近傍に、散気装置２１より発生した気泡が固液分離槽１０に入らないように、好気消化部２０側に設置されている。即ち、散気装置２１の気泡吐出口高さを、仕切板１３の下端よりも高くしている。固液分離部１０のホッパー部に集められた固形物は、この気泡により発生する水流によって、連通部１１を通じて好気消化槽２０側へと引き出され、好気消化槽２０にて好気消化される。
好気消化槽２０にて消化濃縮された汚泥は、連通部１１を通じ固液分離槽１０に戻され、再度固液分離された後、上澄水は移流部１２から後段の嫌気濾床槽３０へ移送される。 In the aerobic digestion tank 20, an air diffuser 21 is installed near the lower part of the communication part 11 on the aerobic digester 20 side so that bubbles generated from the air diffuser 21 do not enter the solid-liquid separation tank 10. ing. That is, the height of the bubble discharge port of the air diffuser 21 is set higher than the lower end of the partition plate 13. The solid matter collected in the hopper part of the solid-liquid separation part 10 is drawn out to the aerobic digester 20 side through the communication part 11 by the water flow generated by the bubbles, and is aerobically digested in the aerobic digester 20. The
The sludge digested and concentrated in the aerobic digestion tank 20 is returned to the solid-liquid separation tank 10 through the communication part 11 and separated again into the solid-liquid separation, and then the supernatant water is transferred from the advection part 12 to the anaerobic filter bed tank 30 in the subsequent stage. Be transported.

嫌気濾床槽３０に流れ込んだ汚水は、嫌気処理された後、移流部３１より後段の好気処理槽(図示略)へ移送される。嫌気処理された汚水の一部は、第１移送手段３２のエアリフトポンプにて、常時好気消化槽２０へと移送される。
移送された汚水中の溶解性ＢＯＤは、好気消化槽２０で汚泥転換され、移送された汚水中のＳＳ分とともに消化される。
このように、本発明においては、好気〜嫌気〜好気が繰り返され、消化率が向上し汚泥量の削減を図ることができる。 The sewage that has flowed into the anaerobic filter bed tank 30 is subjected to anaerobic treatment, and then transferred from the advection section 31 to a subsequent aerobic treatment tank (not shown). A part of the sewage subjected to anaerobic treatment is always transferred to the aerobic digester 20 by the air lift pump of the first transfer means 32.
The soluble BOD in the transferred sewage is converted into sludge in the aerobic digester 20 and digested together with the SS content in the transferred sewage.
Thus, in this invention, aerobic-anaerobic-aerobic are repeated, a digestibility improves and it can aim at reduction of the amount of sludge.

図２は、本発明に係る他の実施例の水処理装置の概略立面図である。以下、先の実施例との違いを説明する。
嫌気濾床槽３０で嫌気処理された汚水は、流量調整ポンプ３４により一旦流量調整マス３５に汲み上げられる。流量調整マス３５では、図３に示すように、第１移送手段３２によりくみ上げられた汚水が、流出口Ａ３６を通過して後段の好気処理槽に、また、流出口Ｂ３７を通過して好気消化槽２０に一定量を移送するため計量され、余剰水は戻される。 FIG. 2 is a schematic elevation view of a water treatment apparatus according to another embodiment of the present invention. The difference from the previous embodiment will be described below.
The sewage subjected to the anaerobic treatment in the anaerobic filter bed tank 30 is once pumped up to the flow rate adjusting mass 35 by the flow rate adjusting pump 34. In the flow rate adjusting mass 35, as shown in FIG. 3, the sewage pumped up by the first transfer means 32 passes through the outlet A36 and enters the aerobic treatment tank at the subsequent stage, and passes through the outlet B37. It is weighed to transfer a certain amount to the gas digester 20 and excess water is returned.

流量調整部３３は、嫌気処理槽３０、好気消化槽２０、固液分離槽１０各々の上部に設置され、具体的には、流量調整部３３の下端の水面（Ｌ．Ｗ．Ｌ）と上端の水面（Ｈ．Ｗ．Ｌ）間の空間部である。流量調整ポンプ３４の吸込口は、流量調整部３３の下端の水面（Ｌ．Ｗ．Ｌ）に設置される。
このように、嫌気処理槽３０の処理水を好気消化槽２０に移送する第１移送手段３２と流量調整ポンプ３４、流量調整マス３５とは兼用することができる。 The flow rate adjustment unit 33 is installed at the upper part of each of the anaerobic treatment tank 30, the aerobic digestion tank 20, and the solid-liquid separation tank 10, specifically, the water surface (LWL) at the lower end of the flow rate adjustment unit 33. It is a space part between the water surfaces (HWL) of an upper end. The suction port of the flow rate adjustment pump 34 is installed on the water surface (LWL) at the lower end of the flow rate adjustment unit 33.
Thus, the 1st transfer means 32 which transfers the treated water of the anaerobic processing tank 30 to the aerobic digestion tank 20, the flow control pump 34, and the flow control mass 35 can be combined.

本発明に係る１実施例である水処理装置の概略立面図である。1 is a schematic elevation view of a water treatment apparatus according to one embodiment of the present invention. 本発明に係る他の実施例である水処理装置の概略立面図である。It is a schematic elevation view of the water treatment apparatus which is another Example which concerns on this invention. 本発明に係る他の実施例の流量調整マスの概略立体図である。It is a schematic three-dimensional view of the flow volume adjustment mass of the other Example which concerns on this invention.

符号の説明Explanation of symbols

１…水処理装置、２…流入口、１０…固液分離槽、１１…連通部、１２…移流部、１３…仕切板、２０…好気消化槽、２１…散気装置、２５…好気消化部、３０…嫌気濾床槽、３１…移流部、３２…第１移送手段、３３…流量調整部、３４…流量調整ポンプ、３５…流量調整マス、３６…流出口Ａ、３７…流出口Ｂ
DESCRIPTION OF SYMBOLS 1 ... Water treatment apparatus, 2 ... Inlet, 10 ... Solid-liquid separation tank, 11 ... Communication part, 12 ... Advection part, 13 ... Partition plate, 20 ... Aerobic digester, 21 ... Air diffuser, 25 ... Aerobic Digestion part, 30 ... Anaerobic filter bed tank, 31 ... Advection part, 32 ... First transfer means, 33 ... Flow rate adjustment part, 34 ... Flow rate adjustment pump, 35 ... Flow rate adjustment mass, 36 ... Outlet A, 37 ... Outlet B

Claims (3)

流入口を通って流入する汚水を固液分離する固液分離槽と、この固液分離槽にて分離された固形物又は汚泥を好気消化する好気消化槽と、この好気消化槽に設けられる散気装置と、上記固液分離槽よりも下流に設けられ、上記固液分離槽にて分離された上澄水を嫌気処理する嫌気処理槽とを備え、上記嫌気処理槽での処理水の一部を上記好気消化槽へと移送する第１移送手段を有する水処理装置であって、上記固液分離槽と上記好気消化槽とは、下端に両槽間の移流口が設けられた仕切板によって互いに仕切られることにより、下部にて互いに連通しており、上記固液分離槽にて分離された固形物又は汚泥は、上記散気装置が吐出する気泡により発生する水流によって上記連通部を通じて上記好気消化槽側へ引き出されて好気消化される水処理装置。 A solid-liquid separation tank for solid-liquid separation of sewage flowing in through the inlet, an aerobic digestion tank for aerobic digestion of solids or sludge separated in the solid-liquid separation tank, and an aerobic digestion tank An anaerobic device provided and an anaerobic treatment tank provided downstream of the solid-liquid separation tank and anaerobically treating the supernatant water separated in the solid-liquid separation tank, and treated water in the anaerobic treatment tank a water treatment apparatus that have a portion of the first transfer means for transferring into the aerobic digester, the the solid-liquid separation tank and the aerobic digester, advection port between the two tanks at the lower end The solids or sludge separated in the solid-liquid separation tank are separated from each other by a partition plate provided with a water flow generated by bubbles discharged from the air diffuser. Mizusho to be aerobically digested drawn into the aerobic digestion tank side through the communicating portion by Apparatus. 請求項１において、第１移送手段が、嫌気処理槽での処理水を下流へと移送する第２移送手段と兼用される水処理装置。   The water treatment apparatus according to claim 1, wherein the first transfer means is also used as the second transfer means for transferring the treated water in the anaerobic treatment tank downstream. 請求項２において、第１又は第２の移送手段が、流量調整ポンプである水処理装置。   The water treatment apparatus according to claim 2, wherein the first or second transfer means is a flow rate adjusting pump.
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JP4702748B2 (en) * 2006-07-07 2011-06-15 株式会社ハウステック Water treatment equipment
JP4702749B2 (en) * 2006-07-07 2011-06-15 株式会社ハウステック Water treatment equipment
JP4940415B2 (en) * 2006-07-10 2012-05-30 株式会社ハウステック Aerobic digester and sewage septic tank equipped with this aerobic digester
JP5171678B2 (en) * 2009-02-10 2013-03-27 フジクリーン工業株式会社 Water treatment equipment

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