JPH0671291A - Sewage treatment equipment using packed layer - Google Patents
Sewage treatment equipment using packed layerInfo
- Publication number
- JPH0671291A JPH0671291A JP23023692A JP23023692A JPH0671291A JP H0671291 A JPH0671291 A JP H0671291A JP 23023692 A JP23023692 A JP 23023692A JP 23023692 A JP23023692 A JP 23023692A JP H0671291 A JPH0671291 A JP H0671291A
- Authority
- JP
- Japan
- Prior art keywords
- tank
- treated
- aerobic
- anaerobic tank
- 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.)
- Granted
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
- Biological Treatment Of Waste Water (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は、限られたスペースを利
用して下水の高度処理を行うことができる充填層を用い
た下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 sewage treatment apparatus using a packed bed capable of performing advanced treatment of sewage using a limited space.
【0002】[0002]
【従来の技術】近年、下水の高度処理に対する社会的要
請は益々高くなっている。下水の高度処理の当面の対象
としては、水域の富栄養化を防止するための窒素、リン
があり、その他にBOD、COD、SS等がある。これ
らのうち、BODとSSは好気性の充填層の上部から被
処理水を下向流で流す「生物膜濾過」によってかなりの
程度まで除去することができるが、被処理水中のケルダ
ール性窒素の硝化脱窒を行うためには嫌気充填層と好気
充填層とを使用することが好ましく、このためのプロセ
スも研究されている。2. Description of the Related Art In recent years, social demands for advanced treatment of sewage have been increasing. Immediate targets for advanced treatment of sewage are nitrogen and phosphorus for preventing eutrophication of water bodies, and in addition, BOD, COD, SS and the like. Of these, BOD and SS can be removed to a large extent by "biofilm filtration" in which the water to be treated flows downward from the top of the aerobic packed bed. It is preferable to use an anaerobic packed bed and an aerobic packed bed for performing nitrification denitrification, and the process for this is also researched.
【0003】図3はこのような硝化脱窒を行わせるため
に研究されている装置の代表例を示したもので、比重が
1よりも大きい粒子を充填した好気槽21と嫌気槽22とを
独立に設け、まず被処理水を好気槽21に下向流で流し、
ポンプ23により好気槽21の下部から被処理水を嫌気槽22
の上部まで移送したうえ、嫌気槽22を下向流で流す方式
のものである。ところが、図3のような従来の下水処理
装置は敷地として広い面積が必要であり、都市部の既設
の下水処理場では高度処理のための余分のスペースを確
保することは非常に困難となっているため、容易に採用
することができないという問題があった。またこの下水
処理装置は、大容量のポンプが必要となるという問題も
あった。FIG. 3 shows a typical example of an apparatus studied for performing such nitrification denitrification. An aerobic tank 21 and an anaerobic tank 22 filled with particles having a specific gravity of more than 1. Is provided independently, and first, the water to be treated is allowed to flow downward in the aerobic tank 21.
The anaerobic tank 22 is used to remove the water to be treated from below the aerobic tank 21 by the pump 23.
Is a system in which the anaerobic tank 22 is allowed to flow downward in addition to being transferred to the upper part of the. However, the conventional sewage treatment equipment as shown in FIG. 3 requires a large area as a site, and it becomes very difficult to secure an extra space for advanced treatment at the existing sewage treatment plant in the urban area. Therefore, there is a problem that it cannot be easily adopted. Further, this sewage treatment device also has a problem that a large capacity pump is required.
【0004】また、図4に示すように槽体24の内部に比
重が1よりも小さい粒子を充填して下部を嫌気層25、上
部を好気層26とし、被処理水を上向流として流すととも
に、槽体24の上部から流出する処理水の一部をポンプ27
により嫌気層25へ循環させる「硝化液循環方式」と呼ば
れるものも研究されている。この図4の装置は設置スペ
ースが比較的少ない利点があるが、好気層26で硝化され
た液の一部はそのまま処理水として流出してしまうため
に、100 %の脱窒は理論的にも不可能であるうえ、硝化
液循環のために大容量のポンプが必要となるという問題
もあった。As shown in FIG. 4, the tank 24 is filled with particles having a specific gravity of less than 1 to form an anaerobic layer 25 in the lower part and an aerobic layer 26 in the upper part, and the water to be treated as an upward flow. A part of the treated water that flows out from the upper part of the tank 24 is pumped 27
The so-called “nitrifying solution circulation system” for circulating the anaerobic layer 25 has also been studied. The device of Fig. 4 has the advantage that the installation space is relatively small, but a part of the nitrification liquid in the aerobic layer 26 flows out as it is as treated water, so 100% denitrification is theoretically possible. In addition, there is a problem that a large-capacity pump is required for circulating the nitrifying solution.
【0005】[0005]
【発明が解決しようとする課題】本発明は上記した従来
の問題点を解決し、広いスペースや大容量のポンプを必
要とせず、高い脱窒率で下水の高度処理を行うことがで
きる充填層を用いた下水処理装置を提供するために完成
されたものである。DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned problems of the prior art, does not require a wide space or a large capacity pump, and can perform advanced treatment of sewage with a high denitrification rate. It has been completed to provide a sewage treatment apparatus using the.
【0006】[0006]
【課題を解決するための手段】上記の課題を解決するた
めになされた第1の発明は、槽体の内部を下端に流通部
を持つ垂直な隔壁により2分して被処理水流入側の好気
槽と流出側の嫌気槽とし、槽体の槽底部に支持層を設け
て好気槽側と嫌気槽側の充填層をそれぞれ支持させ、好
気槽の支持層の直上位置には散気配管を設け、嫌気槽の
支持層の直上位置にはメタノール注入管を設けるととも
に、嫌気槽に隣接させてU字状流路を設けてその下部に
オゾン供給器を設けたことを特徴とするものである。ま
た同一の課題を解決するための第2の発明は、槽体の内
部を下端と上端に流通部を持つ垂直な隔壁により2分し
て被処理水流入側の嫌気槽と流出側の好気槽とし、槽体
の槽底部に支持層を設けて好気槽側と嫌気槽側の充填層
をそれぞれ支持させ、好気槽の支持層の直上位置には散
気配管を設け、嫌気槽への被処理水の流入部にはメタノ
ール注入管を設けたことを特徴とするものである。A first aspect of the present invention, which has been made to solve the above-mentioned problems, divides the inside of the tank body into two parts by a vertical partition wall having a circulation portion at the lower end, and divides the inside of the treated water inflow side. An aerobic tank and an anaerobic tank on the outflow side are provided, and a support layer is provided at the bottom of the tank body to support the packed layers on the aerobic tank side and the anaerobic tank side, respectively, and in a position directly above the support layer of the aerobic tank. An air supply pipe is provided, a methanol injection pipe is provided directly above the support layer of the anaerobic tank, a U-shaped flow path is provided adjacent to the anaerobic tank, and an ozone supplier is provided below the U-shaped flow path. It is a thing. A second invention for solving the same problem divides the inside of the tank body into two by a vertical partition having a circulation portion at the lower end and the upper end, and divides the anaerobic tank on the inflow side of the treated water and the aerobic tank on the outflow side. As a tank, a supporting layer is provided at the bottom of the tank to support the filling layers on the aerobic tank side and the anaerobic tank side respectively, and an aeration pipe is installed directly above the supporting layer of the aerobic tank to the anaerobic tank. A methanol injection pipe is provided at the inflow portion of the untreated water.
【0007】[0007]
【実施例】以下に各発明を実施例とともに更に詳細に説
明する。図1は第1の発明の実施例を示す図であり、1
は槽体、2はその内部を2分する垂直な隔壁、3はその
下端に形成された、高さが20〜30cm程度で幅が槽体1の
全幅にわたる流通部である。槽体1の内部は隔壁2によ
って被処理水流入側の好気槽4と流出側の嫌気槽5とに
区画されており、これらの両区画にわたって槽底部に砂
利等で構成された厚さが50cm程度の支持層6が形成され
ている。被処理水は好気槽4を下向流として流れ、支持
層6内を水平方向に流れて嫌気槽5に入り、嫌気槽5を
上向流として流れる。EXAMPLES Each invention will be described in more detail below with reference to examples. FIG. 1 is a diagram showing an embodiment of the first invention.
Is a vertical partition wall that divides the inside of the tank body, 2 is a vertical partition wall, and 3 is a distribution portion formed at the lower end of the tank body having a height of about 20 to 30 cm and a width of the entire tank body 1. The inside of the tank body 1 is divided by a partition wall 2 into an aerobic tank 4 on the inflow side of the water to be treated and an anaerobic tank 5 on the outflow side. A support layer 6 of about 50 cm is formed. The water to be treated flows in the aerobic tank 4 as a downward flow, flows horizontally in the support layer 6 into the anaerobic tank 5, and then flows in the anaerobic tank 5 as an upward flow.
【0008】好気槽4と嫌気槽5のいずれにも、支持層
6の上に充填層7、8が支持されている。充填層7、8
は粒状の充填材からなるもので、充填材の表面には生物
膜が形成されている。好気槽4の支持層6の直上位置に
は散気配管9が設けられており、好気槽4内に散気を行
って酸素を供給している。一方、嫌気槽5の支持層6の
直上位置にはメタノール注入管10を設け、嫌気槽5の充
填層8に付着している脱窒菌に脱窒のために必要な水素
供与体を供給するようになっている。更に支持層6の最
下部には、全体にわたって充填層7、8を洗浄するため
の空気+水配管11が設けられている。In both the aerobic tank 4 and the anaerobic tank 5, packing layers 7 and 8 are supported on a supporting layer 6. Packing layers 7, 8
Is a granular filler, and a biofilm is formed on the surface of the filler. An aeration pipe 9 is provided directly above the support layer 6 of the aerobic tank 4 to diffuse oxygen into the aerobic tank 4 to supply oxygen. On the other hand, a methanol injection pipe 10 is provided immediately above the support layer 6 of the anaerobic tank 5 so that the denitrifying bacteria adhering to the packed layer 8 of the anaerobic tank 5 are supplied with a hydrogen donor necessary for denitrification. It has become. Further, at the bottom of the support layer 6, an air + water pipe 11 for cleaning the filling layers 7 and 8 is provided all over.
【0009】嫌気槽5に隣接する位置にはU字状流路12
が設けられており、その下部にオゾン供給器13を設けて
ある。このため、嫌気槽5の上端から流出した処理水は
このU字状流路12を流れる間にオゾン化空気の散気を受
けることとなる。A U-shaped flow path 12 is provided at a position adjacent to the anaerobic tank 5.
Is provided, and an ozone supplier 13 is provided below it. Therefore, the treated water flowing out from the upper end of the anaerobic tank 5 receives the diffused ozonized air while flowing through the U-shaped channel 12.
【0010】このように構成された第1の発明の充填層
を用いた下水処理装置は、まず被処理水を好気槽4内を
下向流として流し、充填層7を流下する間にケルダール
性窒素を硝化して硝酸性窒素となる。またBODは好気
的に分解され、SSは充填層7に捕捉されてそれぞれ除
去される。次に被処理水は支持層6内を水平方向に流れ
て嫌気槽5に入り、嫌気槽5の充填層8間を上向流とし
て流れる。この間に硝酸性窒素は充填層8に付着してい
る脱窒菌により脱窒される。その後、被処理水はU字状
流路12を流れる間にオゾン供給器13からオゾンの供給を
受け、処理水の殺菌、溶存酸素の付与、CODの除去、
色度除去が図られる。In the sewage treatment apparatus using the packed bed of the first aspect of the invention constructed as described above, first, the water to be treated is made to flow in the aerobic tank 4 as a downward flow, and while it is made to flow down the packed bed 7, Kjeldahl. Nitric acid is nitrified into nitrate nitrogen. Further, BOD is aerobically decomposed, and SS is captured by the packed bed 7 and removed. Next, the water to be treated flows horizontally in the support layer 6, enters the anaerobic tank 5, and flows as an upward flow between the packed layers 8 of the anaerobic tank 5. During this period, the nitrate nitrogen is denitrified by the denitrifying bacteria adhering to the packed bed 8. Thereafter, the water to be treated is supplied with ozone from the ozone supplier 13 while flowing through the U-shaped channel 12, sterilizes the treated water, imparts dissolved oxygen, removes COD,
Chromaticity removal is achieved.
【0011】この第1の発明の充填層を用いた下水処理
装置は、硝化と脱窒を順次行わせるので原理的に窒素を
100 %除去することができる利点があり、また好気槽4
が下向流であるために充填層7の安定性の高い利点があ
る。更に図3に示した従来の装置とは異なり、設置スペ
ースを減少できることと、ポンプを必要としない利点が
ある。In the sewage treatment apparatus using the packed bed of the first aspect of the present invention, nitrification and denitrification are sequentially carried out, and therefore, in principle, nitrogen is removed.
There is an advantage that 100% can be removed, and aerobic tank 4
Is advantageous because the packed bed 7 is highly stable. Further, unlike the conventional device shown in FIG. 3, there is an advantage that the installation space can be reduced and a pump is not required.
【0012】図2は第2の発明の実施例を示す図であ
り、槽体1の内部が垂直な隔壁2により2分されている
こと、槽底部に砂利等で構成された支持層6が形成され
ていることは第1の発明と同様であるが、隔壁2の下端
に流通部3が形成されているほか、その上端にも流通部
14が形成されている。また第2の発明では、第1の発明
とは逆に被処理水流入側が嫌気槽5とされ、流出側が好
気槽4とされている。なお、好気槽4の支持層6の直上
位置に散気配管9が設けられていること、支持層6の最
下部に充填層7、8を洗浄するための空気+水配管11が
設けられていることも第1の発明と同様である。FIG. 2 is a view showing an embodiment of the second invention, in which the inside of the tank body 1 is divided into two by a vertical partition wall 2, and a support layer 6 made of gravel or the like is provided at the bottom of the tank. It is the same as that of the first aspect of the invention, but the circulation part 3 is formed at the lower end of the partition wall 2 and the circulation part is also formed at the upper end thereof.
14 are formed. Further, in the second invention, contrary to the first invention, the treated water inflow side is the anaerobic tank 5, and the outflow side is the aerobic tank 4. It should be noted that an air diffuser pipe 9 is provided directly above the support layer 6 of the aerobic tank 4, and an air + water pipe 11 for washing the filling layers 7 and 8 is provided at the bottom of the support layer 6. That is also the same as the first invention.
【0013】このように構成された第2の発明の充填層
を用いた下水処理装置では、好気槽4における散気によ
って嫌気槽5との間に密度差が生じ、これが推進力とな
って好気槽4では被処理水が浮上し、嫌気槽5で下降す
る循環を生ずる。なお、好気槽4から嫌気槽5への循環
量は隔壁2の上端の高さを変えることにより調節するこ
とができる。この場合、循環水量/流入水量として表さ
れる循環率は装置の制約から約400 %となる。In the sewage treatment apparatus using the packed bed according to the second aspect of the present invention constructed as above, a difference in density is generated between the anaerobic tank 5 and the anaerobic tank 5 due to air diffusion in the aerobic tank 4, and this becomes a driving force. In the aerobic tank 4, the water to be treated floats and in the anaerobic tank 5, a downward circulation occurs. The circulation amount from the aerobic tank 4 to the anaerobic tank 5 can be adjusted by changing the height of the upper end of the partition wall 2. In this case, the circulation rate, which is expressed as circulating water volume / inflow water volume, is about 400% due to equipment restrictions.
【0014】さて、被処理水はメタノールを供給された
うえで、好気槽4からの硝化液とともに嫌気槽5を下向
流として流れ、充填層8に付着している脱窒菌により硝
酸性窒素が脱窒される。このとき、被処理水中にBOD
が存在すれば、BODは脱窒のための水素供与体の一部
として用いられて除去され、SSは嫌気槽5の充填層8
で捕捉されて除去される。嫌気槽5を通過した被処理水
は支持層6を水平に流れて好気槽4へ入り、好気槽4内
を上向流として流れる。この間に残余のBOD及びメタ
ノールが好気的に分解され、一部は最終処理水として排
出され、一部は嫌気槽5に循環される。After the water to be treated is supplied with methanol, it flows downward in the anaerobic tank 5 together with the nitrifying solution from the aerobic tank 4 by the denitrifying bacteria adhering to the packed bed 8 to produce nitrate nitrogen. Is denitrified. At this time, BOD in the water to be treated
If present, BOD is used as part of the hydrogen donor for denitrification and removed, and SS is packed bed 8 of anaerobic tank 5.
Are captured and removed by. The water to be treated that has passed through the anaerobic tank 5 flows horizontally through the support layer 6 into the aerobic tank 4, and flows in the aerobic tank 4 as an upward flow. During this period, the remaining BOD and methanol are aerobically decomposed, a part is discharged as final treated water, and a part is circulated to the anaerobic tank 5.
【0015】この第2の発明の充填層を用いた下水処理
装置は、80%程度の脱窒率を達成できること、被処理水
中のBODを脱窒の際の水素供与体として利用できるた
めメタノールを削減できること、図3、図4の装置とは
異なり硝化液循環等のためのポンプが不必要なこと、最
終処理水が好気的で余剰のメタノールが分解されるた
め、処理水を二次汚染するおそれがないこと、処理水に
酸素を付与するための設備が不要であること等の利点が
ある。更に図3に示した従来の装置に比較して、設置ス
ペースを減少できる利点がある。The sewage treatment apparatus using the packed bed according to the second aspect of the present invention can achieve a denitrification rate of about 80% and can use BOD in the water to be treated as a hydrogen donor during denitrification, so that methanol can be used. 2) Contamination of treated water due to the fact that a pump for circulating the nitrifying solution is not necessary unlike the equipment of Fig. 3 and Fig. 4 and that the final treated water is aerobic and decomposes excess methanol. There is an advantage that there is no fear of this, and that there is no need for equipment for adding oxygen to the treated water. Further, compared with the conventional device shown in FIG. 3, there is an advantage that the installation space can be reduced.
【0016】[0016]
【発明の効果】以上に説明したように、本発明の充填層
を用いた下水処理装置は従来の装置に比較して設置スペ
ースを減少できるので、限られたスペースに設置するこ
とができる。また従来のような大容量のポンプを必要と
しない利点がある。更に第1の発明によれば、原理的に
窒素を100 %除去することができ、充填層7の安定性の
高い利点を得ることができる。また第2の発明によれ
ば、80%程度の脱窒率を達成できること、被処理水中の
BODを脱窒の際の水素供与体として利用できるためメ
タノールを削減できること、メタノールが処理水を二次
汚染するおそれがないこと、処理水に酸素を付与するた
めの設備が不要であること等の利点がある。よって本発
明は従来の問題点を解消した充填層を用いた下水処理装
置として、産業の発展に寄与するところは極めて大きい
ものがある。As described above, the sewage treatment apparatus using the packed bed of the present invention can be installed in a limited space because the installation space can be reduced as compared with the conventional apparatus. Further, there is an advantage that a large-capacity pump as in the past is not required. Further, according to the first invention, in principle, 100% of nitrogen can be removed, and the advantage that the filling layer 7 is highly stable can be obtained. According to the second invention, a denitrification rate of about 80% can be achieved, BOD in the water to be treated can be used as a hydrogen donor at the time of denitrification, so that the amount of methanol can be reduced. There are advantages such as no possibility of contamination and the fact that no facility is required to add oxygen to the treated water. Therefore, the present invention has an extremely large contribution to the industrial development as a sewage treatment apparatus using a packed bed that solves the conventional problems.
【図1】第1の発明の実施例を示す断面図である。FIG. 1 is a cross-sectional view showing an embodiment of the first invention.
【図2】第2の発明の実施例を示す断面図である。FIG. 2 is a sectional view showing an embodiment of the second invention.
【図3】従来例を示す断面図である。FIG. 3 is a cross-sectional view showing a conventional example.
【図4】他の従来例を示す断面図である。FIG. 4 is a cross-sectional view showing another conventional example.
1 槽体 2 隔壁 3 流通部 4 好気槽 5 嫌気槽 6 支持層 7 充填層 8 充填層 9 散気配管 10 メタノール注入管 11 空気+水配管 12 U字状流路 13 オゾン供給器 14 流通部 1 Tank Body 2 Partition 3 Flow Section 4 Aerobic Tank 5 Anaerobic Tank 6 Support Layer 7 Packing Layer 8 Packing Layer 9 Diffusing Pipe 10 Methanol Injection Pipe 11 Air + Water Pipe 12 U-Shaped Channel 13 Ozone Supplyer 14 Flowing Portion
Claims (2)
隔壁により2分して被処理水流入側の好気槽と流出側の
嫌気槽とし、槽体の槽底部に支持層を設けて好気槽側と
嫌気槽側の充填層をそれぞれ支持させ、好気槽の支持層
の直上位置には散気配管を設け、嫌気槽の支持層の直上
位置にはメタノール注入管を設けるとともに、嫌気槽に
隣接させてU字状流路を設け、その下部にオゾン供給器
を設けたことを特徴とする充填層を用いた下水処理装
置。1. The inside of the tank is divided into two parts by a vertical partition having a circulation part at the lower end to form an aerobic tank on the inflow side of the treated water and an anaerobic tank on the outflow side, and a support layer is provided on the bottom of the tank body. Provided to support the packed layers on the aerobic tank side and the anaerobic tank side respectively, an air diffusion pipe is provided directly above the supporting layer of the aerobic tank, and a methanol injection pipe is provided directly above the supporting layer of the anaerobic tank. At the same time, a U-shaped flow path is provided adjacent to the anaerobic tank, and an ozone supplier is provided below the U-shaped flow path.
垂直な隔壁により2分して被処理水流入側の嫌気槽と流
出側の好気槽とし、槽体の槽底部に支持層を設けて好気
槽側と嫌気槽側の充填層をそれぞれ支持させ、好気槽の
支持層の直上位置には散気配管を設け、嫌気槽への被処
理水の流入部にはメタノール注入管を設けたことを特徴
とする充填層を用いた下水処理装置。2. The inside of the tank is divided into two parts by a vertical partition having a circulation portion at the lower end and the upper end to form an anaerobic tank on the inflow side of the water to be treated and an aerobic tank on the outflow side, which is supported on the bottom of the tank body. A layer is provided to support the packed layers on the aerobic tank side and the anaerobic tank side, respectively, and an aeration pipe is provided directly above the supporting layer of the aerobic tank. A sewage treatment apparatus using a packed bed, which is provided with an injection pipe.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP23023692A JP2539572B2 (en) | 1992-08-28 | 1992-08-28 | Sewage treatment device using packed bed |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP23023692A JP2539572B2 (en) | 1992-08-28 | 1992-08-28 | Sewage treatment device using packed bed |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH0671291A true JPH0671291A (en) | 1994-03-15 |
JP2539572B2 JP2539572B2 (en) | 1996-10-02 |
Family
ID=16904668
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP23023692A Expired - Fee Related JP2539572B2 (en) | 1992-08-28 | 1992-08-28 | Sewage treatment device using packed bed |
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JP (1) | JP2539572B2 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6998995B2 (en) | 2001-09-28 | 2006-02-14 | Toshiba Elevator Kabushiki Kaisha | Elevator remote monitoring apparatus |
JP2011092831A (en) * | 2009-10-28 | 2011-05-12 | Metawater Co Ltd | System and method for reducing amount of generated gas |
US8267560B2 (en) | 2006-11-13 | 2012-09-18 | Isuzu Motors Limited | Combination lamp attachment structure |
CN110655185A (en) * | 2018-12-07 | 2020-01-07 | 江苏省环境科学研究院 | Novel denitrification filter tank denitrification method for treating waste by waste |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS54108458A (en) * | 1978-02-13 | 1979-08-25 | Toshiba Corp | Method of decoloring and purifying night-soil |
JPS5681197A (en) * | 1979-12-06 | 1981-07-02 | Ebara Infilco Co Ltd | Apparatus for nitrificating and denitrificating waste water biologically |
JPS5845792A (en) * | 1981-09-10 | 1983-03-17 | 橋本 奨 | Immersed filter bed type catalytic oxidizing denitrifier using oxygen |
-
1992
- 1992-08-28 JP JP23023692A patent/JP2539572B2/en not_active Expired - Fee Related
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS54108458A (en) * | 1978-02-13 | 1979-08-25 | Toshiba Corp | Method of decoloring and purifying night-soil |
JPS5681197A (en) * | 1979-12-06 | 1981-07-02 | Ebara Infilco Co Ltd | Apparatus for nitrificating and denitrificating waste water biologically |
JPS5845792A (en) * | 1981-09-10 | 1983-03-17 | 橋本 奨 | Immersed filter bed type catalytic oxidizing denitrifier using oxygen |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6998995B2 (en) | 2001-09-28 | 2006-02-14 | Toshiba Elevator Kabushiki Kaisha | Elevator remote monitoring apparatus |
US8267560B2 (en) | 2006-11-13 | 2012-09-18 | Isuzu Motors Limited | Combination lamp attachment structure |
JP2011092831A (en) * | 2009-10-28 | 2011-05-12 | Metawater Co Ltd | System and method for reducing amount of generated gas |
CN110655185A (en) * | 2018-12-07 | 2020-01-07 | 江苏省环境科学研究院 | Novel denitrification filter tank denitrification method for treating waste by waste |
Also Published As
Publication number | Publication date |
---|---|
JP2539572B2 (en) | 1996-10-02 |
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