JPH06246285A - Fluidized-bed type wastewater treatment apparatus - Google Patents
Fluidized-bed type wastewater treatment apparatusInfo
- Publication number
- JPH06246285A JPH06246285A JP6345693A JP6345693A JPH06246285A JP H06246285 A JPH06246285 A JP H06246285A JP 6345693 A JP6345693 A JP 6345693A JP 6345693 A JP6345693 A JP 6345693A JP H06246285 A JPH06246285 A JP H06246285A
- Authority
- JP
- Japan
- Prior art keywords
- carrier
- screen
- water
- fluid
- fluidized
- 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.)
- Granted
Links
- 238000004065 wastewater treatment Methods 0.000 title abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 53
- 239000012530 fluid Substances 0.000 claims abstract description 41
- 238000000926 separation method Methods 0.000 claims abstract description 16
- 238000005086 pumping Methods 0.000 claims description 3
- 239000000969 carrier Substances 0.000 abstract description 4
- 230000005587 bubbling Effects 0.000 abstract 1
- 239000002351 wastewater Substances 0.000 description 12
- 239000010802 sludge Substances 0.000 description 9
- 238000000034 method Methods 0.000 description 8
- 244000005700 microbiome Species 0.000 description 6
- 239000002245 particle Substances 0.000 description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000005484 gravity Effects 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 229920000728 polyester Polymers 0.000 description 2
- 238000011001 backwashing Methods 0.000 description 1
- 238000005352 clarification Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 239000010842 industrial wastewater Substances 0.000 description 1
- 239000008235 industrial water Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000010841 municipal wastewater Substances 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 239000012209 synthetic fiber Substances 0.000 description 1
- 229920002994 synthetic fiber Polymers 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)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は，流動床式廃水処理装置
に関するものであり，特に担体分離用スクリーンの目詰
まりを防止し，連続した廃水処理を行うことができる流
動床式廃水処理装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluidized bed type waste water treatment apparatus, and more particularly to a fluidized bed type waste water treatment apparatus capable of preventing clogging of a carrier separation screen and performing continuous waste water treatment. It is a thing.
【０００２】[0002]
【従来の技術】都市下水，産業廃水等の廃水処理方法と
して，活性汚泥法，流動床法等が用いられている。「生
物膜法」（産業用水調査会編）には，流動化した担体に
高密度の微生物を付着保持させ，廃水処理を行う流動床
法について記載されている。高密度の微生物を流動担体
に付着保持させることのできる流動床法は，浮遊汚泥方
式の活性汚泥法などと比較して単位容積当たりの処理能
力を増大させることができるので，処理設備を小型化す
ることができる。また，固定床法のように槽内の閉塞が
ないため，逆洗の必要がなく，連続して処理が行えると
いう利点がある。2. Description of the Related Art Activated sludge method, fluidized bed method, etc. are used as a wastewater treatment method for municipal wastewater, industrial wastewater and the like. "Biofilm method" (edited by the Industrial Water Research Committee) describes a fluidized bed method in which high-density microorganisms are adhered and retained on a fluidized carrier to treat wastewater. The fluidized bed method, which is capable of adhering and retaining high-density microorganisms on the fluidized carrier, can increase the treatment capacity per unit volume compared to the suspended sludge activated sludge method. can do. Moreover, unlike the fixed bed method, since there is no blockage in the tank, there is an advantage that backwashing is not necessary and continuous processing can be performed.
【０００３】流動床式廃水処理装置によって廃水を処理
するには，まず処理槽内に流動担体を充填し，処理すべ
き廃水を流入管から導入する。次いで，散気装置より空
気を吹き込むと，処理槽内に上昇流が生じ，流動担体は
この流れに乗って流動するとともに，原水と接触する間
に，流動担体の表面や内部に微生物を増殖させる。増殖
しすぎた微生物は，余剰汚泥として引き抜く必要があ
り，流動担体を系外へ取り出して汚泥分離するものや，
剥離汚泥として処理水側へ流出させるものがある。To treat wastewater with a fluidized bed type wastewater treatment apparatus, first, a fluid carrier is filled in a treatment tank, and the wastewater to be treated is introduced from an inflow pipe. Next, when air is blown from the air diffuser, an upward flow is generated in the treatment tank, and the fluidized carrier flows along with this flow and, while coming into contact with the raw water, causes the growth of microorganisms on the surface and inside of the fluidized carrier. . Microorganisms that have proliferated too much need to be extracted as excess sludge, and those that take out the fluid carrier out of the system for sludge separation,
Some of the sludge is discharged to the treated water side.
【０００４】流動担体としては，濾過砂や粒状活性炭，
樹脂，合成繊維製のものなど多種用いることができる。
また，処理水の流出口は，流動床上部の清澄部の上側に
設けられる場合や，流動担体の展開部に設けられる場合
があり，小型の担体分離スクリーンを流出口に伴う場合
もある。As the fluid carrier, filter sand or granular activated carbon,
Various types such as resin and synthetic fiber can be used.
Further, the treated water outlet may be provided on the upper side of the clarification section in the upper part of the fluidized bed or in the developing section of the fluidized carrier, and a small carrier separation screen may be accompanied with the outlet.
【０００５】[0005]
【発明が解決しようとする課題】流動床法に用いられる
担体は，より高密度の微生物を付着保持させるという見
地から，比表面積を大きくできる粒径の小さいものが好
ましい。また，担体を流動させるためには，粒径だけで
なく，比重も小さいものが好ましい。しかし，粒径や比
重の小さい流動担体は処理水とともに系外へ流出し易い
という問題があった。The carrier used in the fluidized bed method is preferably one having a small particle size capable of increasing the specific surface area from the viewpoint of adhering and retaining a higher density of microorganisms. Further, in order to make the carrier flow, it is preferable that not only the particle size but also the specific gravity is small. However, there is a problem that the fluidized carrier with a small particle size and specific gravity easily flows out of the system together with the treated water.
【０００６】また，流動担体の周囲に微生物が増殖する
につれて，流動担体の見掛け比重が小さくなる場合もあ
り，流動担体の流出を防止する適当な担体分離用スクリ
ーンの開発が望まれていた。従来の処理装置のように，
小型の担体分離スクリーンを，水面下にある処理水の流
出口に設置した場合，処理水の水流に乗って，流動担体
がスクリーン面に押しつけられ，水が通過しにくくなっ
たり，生物スライムが付着して目詰まりを生じ，処理水
が流出できなくなるという問題があった。本発明は，流
動担体が処理水ともに流出したり，担体分離用スクリー
ンの目詰まりが生じることのない流動床式廃水処理装置
を提供することを目的とするものである。Further, as the microorganisms grow around the fluid carrier, the apparent specific gravity of the fluid carrier sometimes becomes small, and it has been desired to develop a suitable carrier separating screen for preventing the fluid carrier from flowing out. Like a conventional processor,
When a small carrier separation screen is installed at the outlet of treated water below the water surface, the fluid carrier is pressed against the screen surface by the water flow of the treated water, making it difficult for water to pass through and biological slime adhering to it. Then, there was a problem that clogging occurred and the treated water could not flow out. It is an object of the present invention to provide a fluidized bed type waste water treatment device in which the fluidized carrier does not flow out together with the treated water and the carrier separating screen is not clogged.
【０００７】[0007]
【課題を解決するための手段】本発明者らは，このよう
な課題を解決するために鋭意検討の結果，担体分離用ス
クリーンを処理槽の水面より上部に設けると，上記課題
を解決することができるという知見を得，この知見に基
づいて本発明に到達した。Means for Solving the Problems As a result of intensive studies to solve the above problems, the inventors of the present invention solve the above problems by providing a carrier separation screen above the water surface of a treatment tank. Based on this finding, the inventors arrived at the present invention.
【０００８】すなわち，本発明は，流動担体を充填した
処理槽と，前記処理槽の底部に設けられた散気装置と，
処理水を流動担体とともに前記処理槽の水面より上部に
汲み上げるためのエアリフトポンプと，汲み上げた処理
水と流動担体とを分離するための担体分離用スクリーン
とからなり，前記担体分離用スクリーンを前記処理槽の
水面より上部に設けてなることを特徴とする流動床式廃
水処理装置を要旨とするものである。That is, according to the present invention, a treatment tank filled with a fluid carrier, an air diffuser provided at the bottom of the treatment tank,
An air lift pump for pumping the treated water together with a fluid carrier above the water surface of the treatment tank, and a carrier separation screen for separating the pumped treated water and the fluid carrier. The gist of the present invention is a fluidized bed type wastewater treatment device, characterized in that it is provided above the water surface of the tank.
【０００９】以下，図面を参照しつつ，本発明を具体的
に説明する。図１は，本発明の流動床廃水処理装置の具
体例を示す概略図である。１は処理槽であり，処理槽１
の水深としては，酸素の溶解効率の面から３ｍ以上であ
ることが好ましい。２は流動担体であり，流動担体２と
しては，あらゆる種類の流動担体を用いることができる
が，特にポリエステル製で，粒径が３〜８mmであること
が好ましく，流動担体２の充填率としては，処理槽全容
積に対して５０％以下であることが好ましい。３は廃水
の流入管であり，４はエアリフトポンプである。５はエ
アリフトポンプの調整バルブであり，エアリフトポンプ
の調整バルブ５によりエアリフトポンプ４に供給される
空気量が設定される。その空気量としては，１m3の原水
に対して0.5 〜３m3が好ましい。The present invention will be described in detail below with reference to the drawings. FIG. 1 is a schematic diagram showing a specific example of the fluidized bed wastewater treatment apparatus of the present invention. 1 is a processing tank, processing tank 1
The water depth is preferably 3 m or more from the viewpoint of oxygen dissolution efficiency. Reference numeral 2 denotes a fluid carrier, and any type of fluid carrier can be used as the fluid carrier 2. However, it is preferable that the fluid carrier 2 is made of polyester and has a particle size of 3 to 8 mm. It is preferably 50% or less of the total volume of the processing tank. Reference numeral 3 is a wastewater inflow pipe, and 4 is an air lift pump. Reference numeral 5 is an adjustment valve of the air lift pump, and the adjustment valve 5 of the air lift pump sets the amount of air supplied to the air lift pump 4. As the amount of air, preferably 0.5 to 3M 3 against the raw water of 1 m 3.
【００１０】６は担体分離用スクリーンであり，担体分
離用スクリーン６を処理槽１の水面１０より上部に設け
ることが必要であるが，揚程が高くなるほど必要空気量
が増加するので，水面１０より上部１〜１０cmに設ける
ことが好ましい。担体分離用スクリーン６の選定は，流
動担体２の種類によっても異なるが，基本的には，球状
の担体を使用する場合，担体の粒径よりも小さい目開き
のウェッジワイヤースクリーンを設置することが好まし
く，担体の形状によっては，パンチングメタル等の多孔
板を用いることもできる。７は処理水の流出管であり，
８は散気装置であり，散気装置８を処理槽１の底部に設
置することが必要である。９はブロワーであり，このと
きのブロワーとしては，生物処理に必要な空気量と，エ
アリフトに必要な空気量を併せて供給できるものが好ま
しい。Reference numeral 6 denotes a carrier separating screen. It is necessary to provide the carrier separating screen 6 above the water surface 10 of the treatment tank 1. However, since the required air amount increases as the head rises, It is preferably provided in the upper portion of 1 to 10 cm. The selection of the carrier separation screen 6 depends on the type of the fluid carrier 2, but basically, when using a spherical carrier, a wedge wire screen having an opening smaller than the particle size of the carrier should be installed. Preferably, a porous plate such as punching metal may be used depending on the shape of the carrier. 7 is an outflow pipe for the treated water,
8 is an air diffuser, and it is necessary to install the air diffuser 8 at the bottom of the processing tank 1. Reference numeral 9 is a blower. As the blower at this time, a blower capable of supplying both the amount of air required for biological treatment and the amount of air required for air lift is preferable.
【００１１】上記した本発明の装置によって廃水処理を
行うには，例えば，まず処理槽１内に流動担体２を充填
し，処理すべき廃水を流入管３から処理槽１内に導入す
る。このとき，廃水の処理量としては，原水濃度による
が，通常の都市下水の場合には，滞留時間が１〜２時間
となるように調節すればよい。流動担体２と充分に接触
した処理水は，エアリフトポンプ４によって，水面１０
より上部にある担体分離用スクリーン６まで流動担体２
とともに汲み上げられる。処理水は担体分離用スクリー
ン６の上部から，流動担体２とともにオーバーフロー
し，スクリーン面を流下する。このとき，処理水はスク
リーン面を通過して流出管７に入るが，流動担体２はス
クリーン面を転がり落ち，処理槽１内に戻る。同時にス
クリーン面は，転がり落ちる流動担体２で清掃される。In order to perform wastewater treatment by the above-mentioned apparatus of the present invention, for example, the fluid carrier 2 is first filled in the treatment tank 1, and the wastewater to be treated is introduced into the treatment tank 1 through the inflow pipe 3. At this time, the amount of waste water to be treated depends on the concentration of raw water, but in the case of ordinary urban sewage, it may be adjusted so that the residence time is 1 to 2 hours. The treated water that has been sufficiently contacted with the fluid carrier 2 is transferred to the water surface 10 by the air lift pump 4.
Fluid carrier 2 up to carrier separation screen 6 at the upper part
Is pumped up with. The treated water overflows from the upper part of the carrier separating screen 6 together with the fluid carrier 2 and flows down on the screen surface. At this time, the treated water passes through the screen surface and enters the outflow pipe 7, but the fluid carrier 2 rolls down on the screen surface and returns to the inside of the treatment tank 1. At the same time, the screen surface is cleaned by the rolling carrier 2 that falls.
【００１２】[0012]
【作用】本発明によると，担体分離用スクリーンが水面
より上部にあり，流動担体がスクリーン面に押しつけら
れることなく，スクリーン面を転がり落ちるので，流動
担体が処理水ともに流出したり，担体分離用スクリーン
の目詰まりが生じることもなく，あらゆる種類の流動担
体を用いて，連続した廃水処理を行うことができる。ま
た，流動担体がスクリーン面を転がり落ちる間に，流動
担体がスクリーン面を清掃し，さらに空気と接触するの
で，流動担体に付着している汚泥に酸素を供給する効果
もあり，流動担体の浄化能力の向上に役立てることがで
きる。According to the present invention, the carrier separating screen is located above the water surface, and the fluid carrier rolls down on the screen surface without being pressed against the screen surface. Continuous wastewater treatment can be performed using all types of fluid carriers without screen clogging. Further, while the fluid carrier rolls down on the screen surface, the fluid carrier cleans the screen surface and further comes into contact with air, which also has the effect of supplying oxygen to the sludge adhering to the fluid carrier, thus purifying the fluid carrier. It can be used to improve ability.
【００１３】[0013]
【実施例】次に，実施例及び比較例によって本発明を具
体的に説明する。 実施例１ 図１に示す流動床式廃水処理装置を用いて廃水の処理を
行った。容量４０m3，水深4.5 ｍの処理槽内に，流動担
体として，ポリエステル製で粒径５mmのものを，処理槽
全容積に対して４０％の充填率で充填し，処理すべき廃
水を流入管から処理槽内に導入した。担体分離用スクリ
ーンとして，原水の通水量４m3/hr に対して0.4m2 のウ
エッジワイヤースクリーン（目開き0.5mm ）を，水面よ
り上部５cmに設置し，ブロワーから空気量として，１m3
の処理槽に対して５m3を，エアリフトポンプと散気装置
とに供給して，廃水の処理を行った。その結果，担体と
処理水の分離は良好であり，２か月間の連続通水を行っ
ても，スクリーン面に目詰まりは生じなかった。原水の
COD は1220mg/lであったが，処理水のCOD は110mg/l と
なり，安定した処理を行うことができた。また，処理後
の槽内のDOが0.3 〜0.8mg/l 上昇し，酸素供給能力も向
上した。EXAMPLES Next, the present invention will be described in detail with reference to Examples and Comparative Examples. Example 1 Waste water was treated using the fluidized bed type waste water treatment apparatus shown in FIG. In a treatment tank with a volume of 40 m 3 and a water depth of 4.5 m, a flow carrier was filled with polyester having a particle size of 5 mm at a filling rate of 40% with respect to the total volume of the treatment tank, and waste water to be treated was introduced into the inflow pipe. Was introduced into the treatment tank. As a carrier separation screen, a wedge wire screen of 0.4 m 2 (opening 0.5 mm) for 4 m 3 / hr of raw water flow was installed 5 cm above the water surface, and the air volume from the blower was 1 m 3
5 m 3 of the treatment tank was supplied to the air lift pump and the air diffuser to treat the waste water. As a result, the carrier was separated from the treated water well, and the screen surface was not clogged even after continuous water passage for 2 months. Raw water
The COD was 1220 mg / l, but the COD of the treated water was 110 mg / l, and stable treatment was possible. In addition, the DO in the tank after treatment increased by 0.3 to 0.8 mg / l, and the oxygen supply capacity also improved.
【００１４】比較例１ 図１の流動床式廃水処理装置において，水面より上部に
あった担体分離用スクリーンを，水面に対して６０°と
なるように水面下に設置して廃水の処理を行った。担体
分離用スクリーンとして，まず，原水の通水量４m3/hr
に対して大きさ0.4m2 のスクリーンを浸漬したが，流動
担体が処理水の水流に乗ってスクリーン面に押しつけら
れ，通水が困難であったので，次に，大きさ１m2のスク
リーンに交換し，ブロワーから空気量として，１m3の処
理槽に対して５m3を散気装置に供給して，廃水の処理を
行った。その結果，連続通水時間は0.4m2 のスクリーン
の場合より長くなったが，２４時間が限度であった。ま
た，活性汚泥などのスライムにより，スクリーン面の目
詰まりが生じた。Comparative Example 1 In the fluidized bed type waste water treatment apparatus of FIG. 1, the carrier separating screen located above the water surface is installed below the water surface so as to be at an angle of 60 ° with respect to the water surface to treat the waste water. It was As a screen for carrier separation, the raw water flow rate is 4 m 3 / hr.
Was immersed screen size 0.4 m 2 against, is pressed against the screen surface flow carrier riding on the water flow of the treated water, the water flow is difficult, then, to the size of 1 m 2 Screen exchanged, as an air amount from the blower supplies a 5 m 3 in air diffuser to the processing tank of 1 m 3, was treated in the waste water. As a result, the continuous water flow time was longer than that of the 0.4 m 2 screen, but it was limited to 24 hours. In addition, slime such as activated sludge caused clogging of the screen surface.
【００１５】[0015]
【発明の効果】本発明によれば，流動担体が処理水とも
に流出したり，担体分離用スクリーンの目詰まりが生じ
ることなく，あらゆる種類の流動担体を用いて連続した
廃水処理を行うことができる。また，流動担体がスクリ
ーン面を転がり落ちる間に，流動担体がスクリーン面を
清掃し，さらに空気と接触するので，流動担体に付着し
ている汚泥に酸素を供給する効果もあり，流動担体の浄
化能力の向上に役立てることが可能となる。EFFECTS OF THE INVENTION According to the present invention, continuous wastewater treatment can be performed using all kinds of fluid carriers without the fluid carrier flowing out together with the treated water and the carrier separating screen not being clogged. . Further, while the fluid carrier rolls down on the screen surface, the fluid carrier cleans the screen surface and further comes into contact with air, which also has the effect of supplying oxygen to the sludge adhering to the fluid carrier, thus purifying the fluid carrier. It becomes possible to use it for improving the ability.
【図１】本発明の流動床式廃水処理装置の具体例を示す
概略図である。FIG. 1 is a schematic view showing a specific example of a fluidized bed type wastewater treatment device of the present invention.
１ 処理槽 ２ 流動担体 ３ 廃水の流入管 ４ エアリフトポンプ ５ エアリフトポンプの調整バルブ ６ 担体分離用スクリーン ７ 処理水の流出管 ８ 散気装置 ９ ブロワー 10 水面 1 Treatment Tank 2 Fluid Carrier 3 Waste Water Inlet Pipe 4 Air Lift Pump 5 Air Lift Pump Adjustment Valve 6 Carrier Separation Screen 7 Treated Water Outflow Pipe 8 Diffuser 9 Blower 10 Water Surface
Claims (1)
槽の底部に設けられた散気装置と，処理水を流動担体と
ともに前記処理槽の水面より上部に汲み上げるためのエ
アリフトポンプと，汲み上げた処理水と流動担体とを分
離するための担体分離用スクリーンとからなり，前記担
体分離用スクリーンを前記処理槽の水面より上部に設け
てなることを特徴とする流動床式廃水処理装置。1. A treatment tank filled with a fluid carrier, an air diffuser provided at the bottom of the treatment tank, an air lift pump for pumping treated water together with the fluid carrier above the water surface of the treatment tank, and a pumping pump. And a carrier separation screen for separating the treated water and the fluid carrier, wherein the carrier separation screen is provided above the water surface of the treatment tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6345693A JP3477219B2 (en) | 1993-02-25 | 1993-02-25 | Fluidized bed wastewater treatment equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6345693A JP3477219B2 (en) | 1993-02-25 | 1993-02-25 | Fluidized bed wastewater treatment equipment |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2003137636A Division JP2003300086A (en) | 2003-05-15 | 2003-05-15 | Waste water treatment method using fluidized bed |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06246285A true JPH06246285A (en) | 1994-09-06 |
| JP3477219B2 JP3477219B2 (en) | 2003-12-10 |
Family
ID=13229762
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6345693A Expired - Lifetime JP3477219B2 (en) | 1993-02-25 | 1993-02-25 | Fluidized bed wastewater treatment equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3477219B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012213696A (en) * | 2011-03-31 | 2012-11-08 | Kubota Corp | Sewage purification facility |
| JP2020104052A (en) * | 2018-12-27 | 2020-07-09 | 三機工業株式会社 | Water treatment device |
-
1993
- 1993-02-25 JP JP6345693A patent/JP3477219B2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012213696A (en) * | 2011-03-31 | 2012-11-08 | Kubota Corp | Sewage purification facility |
| JP2020104052A (en) * | 2018-12-27 | 2020-07-09 | 三機工業株式会社 | Water treatment device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3477219B2 (en) | 2003-12-10 |
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