JPS628239B2 - - Google Patents
Info
- Publication number
- JPS628239B2 JPS628239B2 JP55071826A JP7182680A JPS628239B2 JP S628239 B2 JPS628239 B2 JP S628239B2 JP 55071826 A JP55071826 A JP 55071826A JP 7182680 A JP7182680 A JP 7182680A JP S628239 B2 JPS628239 B2 JP S628239B2
- Authority
- JP
- Japan
- Prior art keywords
- biological treatment
- water
- tank
- treatment tank
- wastewater
- 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.)
- Expired
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 44
- 238000004140 cleaning Methods 0.000 claims description 21
- 238000000034 method Methods 0.000 claims description 12
- 239000002351 wastewater Substances 0.000 claims description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
- 239000000945 filler Substances 0.000 claims description 5
- 239000007788 liquid Substances 0.000 claims description 5
- 238000004065 wastewater treatment Methods 0.000 claims description 4
- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 claims description 3
- 239000003830 anthracite Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 239000004033 plastic Substances 0.000 claims description 3
- 239000004576 sand Substances 0.000 claims description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 2
- 239000007789 gas Substances 0.000 claims description 2
- 229910052760 oxygen Inorganic materials 0.000 claims description 2
- 239000001301 oxygen Substances 0.000 claims description 2
- 230000000813 microbial effect Effects 0.000 claims 1
- 238000005273 aeration Methods 0.000 description 3
- 239000010802 sludge Substances 0.000 description 3
- 238000005406 washing Methods 0.000 description 3
- 244000005700 microbiome Species 0.000 description 2
- 238000003672 processing method Methods 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 238000013019 agitation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000010842 industrial wastewater Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
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
- Biological Treatment Of Waste Water (AREA)
Description
【発明の詳細な説明】
本発明は、下水、産業廃水、その他の汚水など
の有機性汚水を浄化処理するために、好気性微生
物を生成させ汚水中の汚濁物質を吸着酸化分解さ
せる好気性生物処理方法に関するものである。Detailed Description of the Invention The present invention aims to purify organic wastewater such as sewage, industrial wastewater, and other wastewater by producing aerobic microorganisms that adsorb, oxidize, and decompose pollutants in the wastewater. This relates to a processing method.
一般に砂、アンスラサイト、活性炭、プラスチ
ツク材などの粒状充填材表面に好気性微生物を
付着させ有機性汚水を浄化する方法は、昨今各種
検討されている。中でも固定床状態で汚水と空気
または酸素を粒状充填槽内で接触させ、間欠的に
洗浄して系外に汚泥を排出する方法は、汚泥また
は水を循環することなく処理できること、バルキ
ングが生じないこと、汚泥の閉塞を防止できるこ
と、過作用があり沈降分離部が不要なこと、送
気による撹拌を期待しないためBOD除去に必要
な送気量だけで良いことなどの利点があり注目を
あびている。 In general, various methods for purifying organic wastewater by attaching aerobic microorganisms to the surface of granular fillers such as sand, anthracite, activated carbon, and plastic materials have recently been studied. Among these methods, the method of bringing sewage into contact with air or oxygen in a granular packed tank in a fixed bed state, and discharging the sludge from the system through intermittent cleaning, can be treated without circulating the sludge or water, and does not cause bulking. It is attracting attention because of its advantages, such as being able to prevent sludge clogging, eliminating the need for a sedimentation separation section due to overaction, and requiring only the amount of air needed to remove BOD since no agitation is expected. .
しかしながら、好気性処理槽は被処理液の
BODが著しく高い場合、さらに詳しくはBOD400
mg／以上ある場合には、通水速度を極端に低下
させて処理するか、ポンプなどで循環処理する必
要があつた。ところが通水速度を極端に低下させ
ると、被処理液流入付近の充填部が著しい負荷と
なり、BOD成分のSS転化が著しく充填層の閉塞
をひきおこし、過水時間が非常に短縮されるなど
の欠点があつた。また、ポンプなどで循環を行う
場合では、動力が必要となるため、現在の省エネ
ルギ時代に即した方法とは言いがたい。 However, aerobic treatment tanks
If the BOD is significantly high, more information: BOD400
If the amount exceeds mg/mg/ml, it is necessary to drastically reduce the water flow rate or to circulate the water using a pump or the like. However, if the water flow rate is extremely reduced, the filling area near the inflow of the liquid to be treated will be under significant load, and the SS conversion of BOD components will significantly cause clogging of the packed bed, resulting in a shortening of the overwatering time. It was hot. Furthermore, when circulating with a pump or the like, power is required, so it is difficult to say that this method is suitable for the current energy-saving era.
本発明は、これら従来の不便を排除し、安定で
効率的な処理が行え、かつ省エネルギ対策をも考
慮した処理方法の提供を目的としたものである。 The present invention aims to provide a processing method that eliminates these conventional inconveniences, allows stable and efficient processing, and also takes into account energy saving measures.
本発明は、アンスラサイト、プラスチツク
材、砂、活性炭から選ばれた一種または二種以上
の充填材を充填し、充填槽下部にガス送入管に連
なる散気装置を設けた生物処理槽を用いて、好気
性生物処理を行う際に、当該処理槽を少なくとも
２槽の複数直列に配備し、かつ処理槽と処理槽の
間に中間処理水槽を配備し、被処理液を生物処理
槽、中間処理水槽Ａ、生物処理槽と直列に通
水し、生物処理槽の洗浄時に、被処理液は生物
処理槽から中間処理水槽Ａ、生物処理槽へと
導びかれる様、通水し、被処理液の流れ方向を生
物処理槽，に対して交互にすることを特徴と
する廃水の処理方法。 The present invention uses a biological treatment tank filled with one or more fillers selected from anthracite, plastic material, sand, and activated carbon, and equipped with an aeration device connected to a gas supply pipe at the bottom of the filling tank. When performing aerobic biological treatment, at least two treatment tanks are installed in series, and an intermediate treatment tank is installed between the treatment tanks, and the liquid to be treated is transferred to the biological treatment tank and the intermediate treatment tank. Water is passed in series with the treated water tank A and the biological treatment tank, and when cleaning the biological treatment tank, the water is passed so that the liquid to be treated is guided from the biological treatment tank to the intermediate treatment tank A and the biological treatment tank. A wastewater treatment method characterized by alternating the flow direction of liquid to biological treatment tanks.
本発明を図面をもつて説明すると、被処理水１
は原水管２を通つて生物処理槽に至る。この生
物処理槽ではコンプレツサーまたはブロワ６よ
り送気管５に連なる散気装置４より散気されてい
る充填槽３内で好気的な生物処理が行われる。生
物処理槽で生物処理された中間処理水は管７を
通り、中間処理水槽としての貯槽Ａに至つたのち
貯槽Ａより配管８を通つて、生物処理槽に至
る。該生物処理槽では生物処理槽と同様に好
気的生物処理が行われ、処理水１０は管９を通つ
て、系外に排出される。 To explain the present invention with drawings, the water to be treated 1
The water passes through the raw water pipe 2 and reaches the biological treatment tank. In this biological treatment tank, aerobic biological treatment is performed in the filled tank 3, which is aerated by a compressor or blower 6 and an aeration device 4 connected to an air pipe 5. The intermediate treated water that has been biologically treated in the biological treatment tank passes through a pipe 7 and reaches a storage tank A as an intermediate treatment water tank, and then passes from the storage tank A through a pipe 8 to reach the biological treatment tank. In the biological treatment tank, aerobic biological treatment is performed in the same manner as in the biological treatment tank, and the treated water 10 is discharged to the outside of the system through the pipe 9.
なお、貯槽Ａの水位を保持するのに管７，７は
立上げ管とするのがよい。 In order to maintain the water level in the storage tank A, the pipes 7, 7 are preferably riser pipes.
このようにして、数時間から数十時間処理を継
続すると、生物処理槽で損失水頭が増大し、生
物処理槽での通水が不可能になる。このように
なる前に、詳しくは損失水頭の増加が1000mmを超
えた場合、もしくは損失頭の増加が1000mmを超え
ると予想される時刻に、生物処理槽の洗浄工程
に入る。洗浄は洗浄ポンプ１７を作動させ貯槽Ａ
の水を用いて洗浄配管１１より生物処理槽の下
部より行なう。洗浄排水はオーバーフロー管１８
より排出される。 If the treatment continues for several to several tens of hours in this manner, the head loss in the biological treatment tank increases, making it impossible to pass water through the biological treatment tank. Before this happens, specifically, when the increase in head loss exceeds 1000 mm, or at the time when the increase in head loss is expected to exceed 1000 mm, the cleaning process of the biological treatment tank begins. For cleaning, operate the cleaning pump 17 to clean the storage tank A.
The cleaning is carried out from the lower part of the biological treatment tank through the cleaning pipe 11 using water from the bottom of the biological treatment tank. Washing drainage is overflow pipe 18
more excreted.
一方生物処理槽が洗浄工程に入いると同時に
流路配管中の弁１２，１３，１６，１４，１５が
閉、弁１２′，１３′が開となり、今度は被処理水
１′は原水管２′を通つて生物処理槽に至る。生
物処理槽では好気的生物処理が行われ、中間処
理水として貯槽Ａに管７′を通つて導びかれる。
そして生物処理槽では、中間処理水を用いて洗
浄が行われている最中であるため、生物処理槽
より生じる中間処理水１０′は洗浄水の補給にも
なる。 On the other hand, at the same time as the biological treatment tank enters the cleaning process, valves 12, 13, 16, 14, and 15 in the flow path piping are closed, valves 12' and 13' are opened, and the water to be treated 1' is now transferred to the raw water pipe. 2' to the biological treatment tank. Aerobic biological treatment is carried out in the biological treatment tank, and the water is led to storage tank A through pipe 7' as intermediate treated water.
In the biological treatment tank, cleaning is currently being performed using the intermediate treated water, so the intermediate treated water 10' generated from the biological treatment tank also serves as a replenishment of the cleaning water.
このようにして、洗浄している生物処理槽で
の洗浄が終了すると、弁１６′，１４′，１５が開
となり、処理系統は生物処理槽→貯槽Ａ→生物
処理槽となり、はじめのフローと全く逆にな
る。このフローで処理を続け、生物処理槽の損
失水頭が著しく増大した場合には、今度は生物処
理槽を洗浄することになる。洗浄方法は生物処
理槽の場合と全く同一に行い、洗浄終了後の処
理フローは生物処理槽→貯槽Ａ→生物処理槽
となり、一番はじめのフローにもどる。本実施例
では生物処理槽が２つの場合を示したが、３槽以
上でもよく、その場合には洗浄しようとする生物
処理槽の前に貯槽を設ければよい。 In this way, when cleaning is completed in the biological treatment tank being cleaned, valves 16', 14', and 15 are opened, and the treatment system changes from biological treatment tank to storage tank A to biological treatment tank, which is the same as the initial flow. It's exactly the opposite. If the treatment continues in this flow and the head loss of the biological treatment tank increases significantly, the biological treatment tank will be cleaned this time. The cleaning method is exactly the same as for the biological treatment tank, and the processing flow after cleaning is biological treatment tank → storage tank A → biological treatment tank, and returns to the first flow. Although this embodiment shows a case where there are two biological treatment tanks, three or more tanks may be used, and in that case, a storage tank may be provided in front of the biological treatment tank to be cleaned.
また生物処理槽の洗浄方法として、洗浄水とし
て中間処理水を用いこれに空気を用いることも有
効であり適宜選んで用いられる。 Furthermore, as a method for cleaning the biological treatment tank, it is also effective to use intermediately treated water as the cleaning water and use air as the cleaning water, which is selected and used as appropriate.
さらに前記生物処理槽は充填槽３′、散気装
置４′、送気管５′及び管７′、配管８、管９並び
にオーバーフロー管１８′を備えて生物処理槽
と同様な構成のものを用いてあるが、貯槽Ａを共
通に用いられる形態とするのが便利である。 Further, the biological treatment tank has the same configuration as the biological treatment tank, including a filling tank 3', an aeration device 4', an air supply pipe 5' and a pipe 7', a pipe 8, a pipe 9, and an overflow pipe 18'. However, it is convenient to have the storage tank A in a commonly used form.
図中８′は配管、９′は管、１０′は処理水、１
１′は洗浄配管、１５′，１９及び１９′は弁であ
る。 In the figure, 8' is a pipe, 9' is a pipe, 10' is treated water, 1
1' is a cleaning pipe, and 15', 19 and 19' are valves.
本発明は２槽または２槽以上直列に生物処理槽
を用いて処理したことより、第１槽の損失水頭の
増加が第２槽に比べて著しく増大すること、洗浄
水を補給しながら洗浄することができるようにし
たものであり、常に最終の生物処理槽の前に貯槽
を介在させるように順次通水を切換え、廃水の通
水を停止することなく切換えた初期に前記貯槽の
水を利用して最終の生物処理槽の洗浄を行うもの
でその結果、被処理水を停止することなく常に生
物処理できること、被処理水のBODが高い場
合、例えば400mg／以上の場合でも、通水速度
を極端に低下することなく（さらに詳しくはLV
＝0.5ｍ／ｈ以下）処理できると共に、またポン
プなどの動力にたよることなく、同時に処理水槽
のかわりに新たに小規模の貯槽ですむことなど、
安定で効率的、なおかつ省エネルギ対策上にも著
しく有益な廃水の処理を可能にするものである。 Since the present invention uses two or more biological treatment tanks in series, the increase in head loss in the first tank is significantly greater than that in the second tank, and cleaning is performed while replenishing washing water. The water flow is sequentially switched so that a storage tank is always placed before the final biological treatment tank, and the water in the storage tank is used at the beginning of the switch without stopping the wastewater flow. As a result, biological treatment can be performed at all times without stopping the water to be treated, and even when the BOD of the water to be treated is high, for example, 400 mg/ or more, the water flow rate can be reduced. without extreme deterioration (more details on LV
= 0.5m/h or less), and at the same time, it does not rely on power such as a pump, and at the same time, it can use a new small-scale storage tank instead of a treatment tank.
This makes it possible to treat wastewater in a stable and efficient manner, which is also extremely beneficial in terms of energy saving measures.
図面は本発明の実施例を示す系統説明図であ
る。
１，１′……被処理水、，……生物処理
槽、２，２′……原水管、Ａ……貯槽、３，３′…
…充填槽、４，４′……散気装置、５，５′……送
気管、６……コンプレツサーまたはブロワ、７，
７′……管、８，８……配管、９，９′……管、１
０，１０′……処理水、１１，１１′……洗浄配
管、１２，１３，１４，１５，１６，１２′，１
３′，１４′，１５′，１６′，１９，１９′……
弁、１７……洗浄ポンプ、１８，１８′……オー
バーフロー管。
The drawing is a system explanatory diagram showing an embodiment of the present invention. 1, 1'... Water to be treated, ,... Biological treatment tank, 2, 2'... Raw water pipe, A... Storage tank, 3, 3'...
...filling tank, 4,4'... air diffuser, 5,5'... air pipe, 6... compressor or blower, 7,
7'...Pipe, 8,8...Piping, 9,9'...Pipe, 1
0, 10'... Treated water, 11, 11'... Cleaning pipe, 12, 13, 14, 15, 16, 12', 1
3', 14', 15', 16', 19, 19'...
Valve, 17...Washing pump, 18, 18'...Overflow pipe.
Claims (1)
理槽の複数に通水する際に各槽直列に通水して廃
水を生物処理する方法において、常に最終の生物
処理槽の前に貯槽を介在させるように順次通水を
切換え、廃水の通水を停止することなく切換えた
初期に前記貯槽の水を利用して最終の生物処理槽
の洗浄を行うものであることを特徴とする廃水の
処理方法。 ２ 前記洗浄工程が、空気を併用して行われるも
のである特許請求の範囲第１項記載の廃水の処理
方法。 ３ 前記生物処理工程が、アンスラサイト、プラ
スチツク材、砂、活性炭から選ばれた一種また
は二種以上の充填材中に充填材下部から空気又は
酸素含有ガスを送入して処理するものである特許
請求の範囲第１項又は第２項記載の廃水の処理方
法。 ４ 前記通水工程が、被処理液の流れ方向を各生
物処理槽に対して交互にするものである特許請求
の範囲第１〜３項のいずれか一つの項記載の廃水
の処理方法。 ５ 前記通水工程が、各生物処理槽の間に中間処
理水槽を介在した形態下で直列に通水するもので
あつて、流路中の弁の開閉によつて通水を切換え
るものである特許請求の範囲第１〜４項のいずれ
か一つの項記載の廃水の処理方法。[Scope of Claims] 1. In a method of biologically treating wastewater by passing water through a plurality of aerobic biological treatment tanks filled with fillers for microbial adhesion, each tank is passed in series, the final biological treatment tank is always The water flow is sequentially switched so that a storage tank is interposed before the water flow, and the final cleaning of the biological treatment tank is performed using the water in the storage tank at the initial stage of switching without stopping the flow of wastewater. Characteristic wastewater treatment method. 2. The wastewater treatment method according to claim 1, wherein the cleaning step is performed using air in combination. 3. A patent in which the biological treatment process is performed by introducing air or an oxygen-containing gas into one or more fillers selected from anthracite, plastic material, sand, and activated carbon from the bottom of the filler. A method for treating wastewater according to claim 1 or 2. 4. The wastewater treatment method according to any one of claims 1 to 3, wherein in the water passage step, the flow direction of the liquid to be treated is alternated with respect to each biological treatment tank. 5. The water passage step is one in which water is passed in series with an intermediate treatment tank interposed between each biological treatment tank, and the water passage is switched by opening and closing a valve in the flow path. A method for treating wastewater according to any one of claims 1 to 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7182680A JPS56168883A (en) | 1980-05-29 | 1980-05-29 | Treatment of waste water |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7182680A JPS56168883A (en) | 1980-05-29 | 1980-05-29 | Treatment of waste water |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS56168883A JPS56168883A (en) | 1981-12-25 |
| JPS628239B2 true JPS628239B2 (en) | 1987-02-21 |
Family
ID=13471737
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7182680A Granted JPS56168883A (en) | 1980-05-29 | 1980-05-29 | Treatment of waste water |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS56168883A (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60202796A (en) * | 1984-03-23 | 1985-10-14 | Mitsubishi Plastics Ind Ltd | Contact oxidation apparatus having vertical detour of passage of water to be treated |
| JPH0638957B2 (en) * | 1986-04-08 | 1994-05-25 | 日本電気株式会社 | Wastewater treatment equipment |
| JPS62294495A (en) * | 1987-05-29 | 1987-12-21 | Hiroshi Kuwajima | Purifying facility for miscellaneous waste water |
| JPH022899A (en) * | 1989-01-14 | 1990-01-08 | Hiroshi Kuwajima | Device for purifying household waste water |
| JP4205468B2 (en) * | 2003-03-31 | 2009-01-07 | 住友重機械エンバイロメント株式会社 | Biological filtration method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52131647A (en) * | 1976-04-27 | 1977-11-04 | Hitachi Chem Co Ltd | Contact oxidation type drainage treatment method |
| JPS5422951A (en) * | 1977-07-20 | 1979-02-21 | Kaoru Nakao | Method of purifying sewage |
-
1980
- 1980-05-29 JP JP7182680A patent/JPS56168883A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52131647A (en) * | 1976-04-27 | 1977-11-04 | Hitachi Chem Co Ltd | Contact oxidation type drainage treatment method |
| JPS5422951A (en) * | 1977-07-20 | 1979-02-21 | Kaoru Nakao | Method of purifying sewage |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS56168883A (en) | 1981-12-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101376556B (en) | Ozone oxidation sterilizing and downflow type aerating biological filter combined waste water treatment apparatus | |
| JP2003126890A (en) | Wastewater treatment apparatus and wastewater treatment method using the same | |
| JPS63270598A (en) | Device for treating sludge | |
| CN207512026U (en) | For the advanced treatment apparatus being for further processing to biochemical treatment tail water | |
| CN206666341U (en) | A kind of ecological environment protection toilet processing unit | |
| JPS628239B2 (en) | ||
| CN107337279A (en) | One kind is based on SBBR wastewater efficients processing unit and method | |
| JP2006289153A (en) | Method of cleaning sewage and apparatus thereof | |
| JPS6082191A (en) | Method and device for treating sewage by microorganism | |
| JPH09314156A (en) | Ozone treatment apparatus in which biological filter device is incorporated | |
| US1439406A (en) | Sewage-disposal plant and system | |
| JPH0632822B2 (en) | Biological filtration reactor | |
| CN206244587U (en) | Compact high efficient biochemistry ozone oxidation sewage treatment unit | |
| JPH10337584A (en) | Sewage treatment tank | |
| CN209957619U (en) | Sewage treatment system adopting biological active coke adsorption method | |
| JPH05277475A (en) | Treatment method for water containing organic substance | |
| JPH0326394A (en) | Septic tank provided with aerobic treating chamber capable of finely adjusting aeration amount | |
| FI121506B (en) | Biological purification procedure | |
| CN100406397C (en) | Organic waste-water treating apparatus utilizing coal slag | |
| JP3497542B2 (en) | Operation of septic tank | |
| JP2001246390A (en) | Two bed juxtaposition type aerobic filter bed tank, septic tank and operation method thereof | |
| JPH05192672A (en) | Method for operating water treating equipment and the same | |
| JPH0326395A (en) | Septic tank capable of adjusting reflux amount from aerobic treating chamber to anaerobic treating chamber | |
| JPH0113598Y2 (en) | ||
| JPS5858190A (en) | Water purifier |