JPH0137988B2 - - Google Patents
Info
- Publication number
- JPH0137988B2 JPH0137988B2 JP4127984A JP4127984A JPH0137988B2 JP H0137988 B2 JPH0137988 B2 JP H0137988B2 JP 4127984 A JP4127984 A JP 4127984A JP 4127984 A JP4127984 A JP 4127984A JP H0137988 B2 JPH0137988 B2 JP H0137988B2
- Authority
- JP
- Japan
- Prior art keywords
- wastewater
- zone
- carrier
- bacteria
- anaerobic zone
- 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
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 45
- 241000894006 Bacteria Species 0.000 claims description 32
- 239000002351 wastewater Substances 0.000 claims description 25
- 229910052757 nitrogen Inorganic materials 0.000 claims description 22
- 239000010802 sludge Substances 0.000 claims description 18
- 230000001546 nitrifying effect Effects 0.000 claims description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 9
- 239000000499 gel Substances 0.000 description 6
- 230000001580 bacterial effect Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 230000003100 immobilizing effect Effects 0.000 description 3
- 239000012528 membrane Substances 0.000 description 3
- 229920002401 polyacrylamide Polymers 0.000 description 3
- 230000000717 retained effect Effects 0.000 description 3
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 description 2
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 2
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229910017604 nitric acid Inorganic materials 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 229920001817 Agar Polymers 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 238000005273 aeration Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 239000000648 calcium alginate Substances 0.000 description 1
- 235000010410 calcium alginate Nutrition 0.000 description 1
- 229960002681 calcium alginate Drugs 0.000 description 1
- OKHHGHGGPDJQHR-YMOPUZKJSA-L calcium;(2s,3s,4s,5s,6r)-6-[(2r,3s,4r,5s,6r)-2-carboxy-6-[(2r,3s,4r,5s,6r)-2-carboxylato-4,5,6-trihydroxyoxan-3-yl]oxy-4,5-dihydroxyoxan-3-yl]oxy-3,4,5-trihydroxyoxane-2-carboxylate Chemical compound [Ca+2].O[C@@H]1[C@H](O)[C@H](O)O[C@@H](C([O-])=O)[C@H]1O[C@H]1[C@@H](O)[C@@H](O)[C@H](O[C@H]2[C@H]([C@@H](O)[C@H](O)[C@H](O2)C([O-])=O)O)[C@H](C(O)=O)O1 OKHHGHGGPDJQHR-YMOPUZKJSA-L 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000000679 carrageenan Substances 0.000 description 1
- 229920001525 carrageenan Polymers 0.000 description 1
- 229940113118 carrageenan Drugs 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000006911 enzymatic reaction Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000012510 hollow fiber Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 229920002492 poly(sulfone) Polymers 0.000 description 1
- 239000005373 porous glass Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 239000006228 supernatant Substances 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
Description
〔発明の属する分野〕
この発明は、有機性廃水中の窒素分を生成学的
に除去する装置に関する。
〔従来技術〕
従来この種の装置は、活性汚泥を浮遊させた好
気性ゾーンと嫌気性ゾーンにわたつて、活性汚泥
を含む廃水を循環させ、窒素分を、好気性ゾーン
において活性汚泥中の硝化菌を用いて硝化し、嫌
気性ゾーンにおいて活性汚泥中の脱窒菌を用いて
脱窒することにより除去するよう構成されてい
る。第１図は、従来の代表的な廃水の生物学的窒
素除去装置のフローシートを示す。原廃水は嫌気
性ゾーン５から流入し、次に好気性ゾーン７に流
入する。廃水中の窒素分は好気性ゾーン７におい
て硝化菌によつて亜硝酸あるいは硝酸に酸化され
る。この酸化態窒素を含む活性汚泥混合液の一部
は嫌気性ゾーン５に戻され、脱窒菌によつて窒素
ガスに還元され、残りの混合液は沈殿槽１４に流
入する。沈殿槽１４の上澄水は放流され、沈殿汚
泥は、一部引き抜かれ残りは嫌気性ゾーン５に返
送される。
このように、従来装置においては、硝化菌と脱
窒菌に混在した活性汚泥が、好気性ゾーンと嫌気
性ゾーンの両ゾーンを循環するために、好気性ゾ
ーンに浮遊する活性汚泥中の脱窒菌および嫌気性
ゾーンに浮遊する活性汚泥中の硝化菌は窒素の除
去に関与することができない。また、好気性ゾー
ンに硝化菌を、嫌気性ゾーンに脱窒菌をそれぞれ
高濃度に保持することが困難である。特に水温の
低下する冬期には、増殖速度の遅い硝化菌が活性
汚泥中にごくわずかしか存在しない状態となる。
そのため窒素除去のために大容積の装置で長時間
処理しなければならない欠点があつた。さらに処
理水を得るために、最終工程で浮遊汚泥を沈殿さ
せるために大型の沈殿槽を設けなければならない
ことも大きな欠点であつた。
〔発明の目的〕
この発明の目的は、前記従来技術の欠点を解消
し、沈殿池が不要でコンパクトな装置で、短時間
で廃水の窒素除去が可能な生物学的窒素除去装置
を提供することにある。
〔発明の要点〕
この発明は、脱窒菌および硝化菌をそれぞれ積
極的に高濃度に担体に固定し、網目スクリーンに
よつて上下に仕切られた単槽の下部嫌気性ゾーン
に脱窒菌の固定化担体を充填し、散気装置により
曝気される上部好気性ゾーンに硝化菌の固定化担
体を保持し、窒素分を含む廃水を前記嫌気性ゾー
ンから好気性ゾーンへと上向流で循環するように
したことを特徴とする。
〔発明の実施例〕
第２図および第３図は、担体としてポリアクリ
ルアミドゲルを用い、その内部にそれぞれ硝化菌
と脱窒菌を包括してNH4−Ｎ含有廃水、NO3−
Ｎ含有廃水をそれぞれ単独に処理した場合の処理
性態即ち滞留時間と処理水質の関係を示したもの
である。いずれの場合も短時間で処理可能なこと
がわかる。
第４図はこの発明に係る廃水の生物学的窒素除
去装置の一実施例の断面図を示す。
槽体１の下部に流入管２を付設する。
流入管２の上方に槽体１に固定された多孔の支
持材３と、槽体の中部に固定された網目スクリー
ン４とによつて区劃された嫌気性ゾーン５に脱窒
菌を固定した担体６を充填して流動させる。
網目スクリーン４の上方に区劃された好気性ゾ
ーン７に散気装置８を付設し空気または酸素を吹
込んで好気性に保つ。好気性ゾーン７に硝化菌を
固定した担体９を充填して流動させる。
好気性ゾーン７の上部には流出管１０を付設す
る。好気性ゾーン７と嫌気性ゾーン５とを連結す
る配管１１の途中にポンプ１２を付設する。
槽体１の下部に沈泥引抜管１３を付設する。
廃水は流入管２から槽体１に流入し嫌気性ゾー
ン５を経て好気性ゾーン７に上向流で流入する。
好気性ゾーン７において、廃水中の窒素分は亜
硝酸あるいは硝酸に酸化される。
これらの酸化態窒素の一部は、ポンプ１２によ
つて嫌気性ゾーン５に戻されて、上向流で循環さ
れ、廃水中の有機物を炭素源として脱窒される。
処理された処理水は流出管１０より流出する。
廃水中の沈殿性の固形成分および固定化担体内
の硝化菌、脱窒菌が増殖して担体外に溢出して生
ずる微量の汚泥は嫌気性ゾーンの下方に沈降し、
汚泥引抜管１３より流出する。
この発明に係る廃水と生物学的窒素除去装置に
おいては、硝化菌と脱窒菌をそれぞれ積極的に高
濃度に担体に保持し、さらにそれらを別々の好気
性および嫌気性ゾーンに保持することによつて、
硝化、脱窒の機能を有効に発揮させることができ
るので、廃水の窒素除去をごく短時間に行うこと
ができる。特に、水温が低下し、硝化、脱窒の反
応速度および菌体の増殖速度が遅くなる冬期にお
いても、菌体が担体に高濃度に保持されるので十
分な処理が可能である。
また、菌体を担体に固定することにより、従来
のような浮遊型の活性汚泥法による窒素除去装置
において生成する膨大な量の余剰汚泥をごくわず
かに抑えることができる。これは、菌体の増殖を
判わない酵素反応が主となつて廃水が処理される
ためだと考えられる。このように余剰汚泥量が微
量であるので従来のような大型の沈殿槽を必要と
せず、コンパクトな単槽で廃水の処理が可能であ
り、大きな特徴となつている。
実施例
原廃水として、BOD100〜180mg／、Ｔ−
N20〜31mg／の下水を用いた。硝化菌及び脱窒
菌の固定化担体として、直径３mm長さ４mmの円柱
状のポリアクリルアミドゲルを用いた。嫌気性ゾ
ーンに脱窒菌の固定化担体を充填率55％で充填
し、好気性ゾーンに硝化菌の固定化担体を充填率
40％で充填して、第４図に示す装置により第１表
に示す条件で処理を行つた。
[Field of the Invention] The present invention relates to an apparatus for biochemically removing nitrogen from organic wastewater. [Prior art] Conventionally, this type of equipment circulates wastewater containing activated sludge between an aerobic zone in which activated sludge is suspended and an anaerobic zone, and removes nitrogen from the activated sludge through nitrification in the aerobic zone. It is configured to perform nitrification using bacteria and remove it by denitrifying using denitrifying bacteria in activated sludge in an anaerobic zone. FIG. 1 shows a flow sheet of a typical conventional wastewater biological nitrogen removal device. Raw wastewater enters from the anaerobic zone 5 and then into the aerobic zone 7. Nitrogen in the wastewater is oxidized to nitrite or nitric acid by nitrifying bacteria in the aerobic zone 7. A part of the activated sludge mixture containing oxidized nitrogen is returned to the anaerobic zone 5 and reduced to nitrogen gas by denitrifying bacteria, and the remaining mixture flows into the settling tank 14. The supernatant water of the settling tank 14 is discharged, a part of the settled sludge is pulled out, and the rest is returned to the anaerobic zone 5. In this way, in conventional equipment, activated sludge containing nitrifying bacteria and denitrifying bacteria circulates through both the aerobic zone and the anaerobic zone. Nitrifying bacteria in activated sludge suspended in the anaerobic zone cannot participate in nitrogen removal. Furthermore, it is difficult to maintain high concentrations of nitrifying bacteria in the aerobic zone and high concentrations of denitrifying bacteria in the anaerobic zone. Particularly in the winter when the water temperature drops, only a small number of nitrifying bacteria, which grow slowly, exist in activated sludge.
For this reason, there was a drawback that the process had to be carried out over a long period of time using a large-capacity device in order to remove nitrogen. Another major drawback was that in order to obtain treated water, a large settling tank had to be installed in order to settle floating sludge in the final step. [Object of the Invention] The object of the present invention is to provide a biological nitrogen removal device that eliminates the drawbacks of the prior art and is capable of removing nitrogen from wastewater in a short time with a compact device that does not require a settling tank. It is in. [Summary of the Invention] This invention actively immobilizes denitrifying bacteria and nitrifying bacteria on a carrier at high concentrations, and immobilizes the denitrifying bacteria in the lower anaerobic zone of a single tank divided into upper and lower parts by a mesh screen. The carrier is filled with a carrier, and the carrier with immobilized nitrifying bacteria is held in the upper aerobic zone which is aerated by an aeration device, and the wastewater containing nitrogen is circulated in an upward flow from the anaerobic zone to the aerobic zone. It is characterized by the following. [Embodiments of the Invention] Figures 2 and 3 show that polyacrylamide gel is used as a carrier, and nitrifying bacteria and denitrifying bacteria are contained inside the gel to collect NH 4 -N-containing wastewater and NO 3 -
This figure shows the relationship between treatment properties, that is, residence time, and treated water quality when N-containing wastewater is treated individually. It can be seen that both cases can be processed in a short time. FIG. 4 shows a sectional view of an embodiment of the biological nitrogen removal device for wastewater according to the present invention. An inflow pipe 2 is attached to the lower part of the tank body 1. A carrier with denitrifying bacteria fixed in an anaerobic zone 5 separated by a porous support material 3 fixed to the tank body 1 above the inflow pipe 2 and a mesh screen 4 fixed to the middle of the tank body. 6 and allow it to flow. An air diffuser 8 is attached to an aerobic zone 7 separated above the mesh screen 4 to maintain aerobic conditions by blowing air or oxygen into the aerobic zone 7. The aerobic zone 7 is filled with a carrier 9 on which nitrifying bacteria are immobilized and allowed to flow. An outflow pipe 10 is attached to the upper part of the aerobic zone 7. A pump 12 is attached in the middle of a pipe 11 connecting an aerobic zone 7 and an anaerobic zone 5. A silt extraction pipe 13 is attached to the lower part of the tank body 1. Wastewater flows into the tank body 1 from the inflow pipe 2, passes through the anaerobic zone 5, and flows upward into the aerobic zone 7. In the aerobic zone 7, nitrogen in the wastewater is oxidized to nitrite or nitric acid. A portion of these oxidized nitrogen is returned to the anaerobic zone 5 by the pump 12, circulated in an upward flow, and denitrified using the organic matter in the wastewater as a carbon source.
The treated water flows out from the outflow pipe 10. A trace amount of sludge generated when the precipitable solid components in the wastewater and nitrifying bacteria and denitrifying bacteria in the immobilized carrier proliferate and overflow outside the carrier settles below the anaerobic zone.
It flows out from the sludge drawing pipe 13. In the wastewater and biological nitrogen removal device according to the present invention, nitrifying bacteria and denitrifying bacteria are each actively retained in a carrier at a high concentration, and they are further retained in separate aerobic and anaerobic zones. Then,
Since the functions of nitrification and denitrification can be effectively exhibited, nitrogen can be removed from wastewater in a very short time. In particular, even in the winter when the water temperature is low and the reaction rates of nitrification and denitrification and the growth rate of bacterial cells are slow, sufficient treatment is possible because the bacterial cells are retained in the carrier at a high concentration. Furthermore, by immobilizing the bacterial cells on a carrier, the enormous amount of surplus sludge produced in a conventional nitrogen removal device using the floating activated sludge method can be suppressed to a very small amount. This is thought to be because wastewater is treated mainly by enzymatic reactions that do not determine the growth of bacterial cells. Since the amount of surplus sludge is small, there is no need for a large sedimentation tank like in the past, and wastewater can be treated with a compact single tank, which is a major feature. Example: As raw wastewater, BOD100-180mg/, T-
20-31 mg of N/sewage was used. A cylindrical polyacrylamide gel with a diameter of 3 mm and a length of 4 mm was used as a support for immobilizing nitrifying bacteria and denitrifying bacteria. The anaerobic zone is filled with denitrifying bacteria immobilized carrier at a filling rate of 55%, and the aerobic zone is filled with nitrifying bacteria immobilized carrier at a filling rate of 55%.
It was filled with 40% and processed under the conditions shown in Table 1 using the apparatus shown in FIG.
【表】【table】
前記実施例においては、硝化菌あるいは脱窒菌
を固定する担体としてポリアクリルアミドゲルを
用いたが、その他アルギン酸カルシウム、ｋ−カ
ラギーナン、寒天ゲル、光硬化性樹脂などを用い
てもよい。また好気性ゾーン内に中空糸膜を設置
し、膜を透過する流出水を処理水とすることによ
り、浮遊固形物をほぼ完全に除去することができ
る。膜材質としては、スルホン化ポリスルホン、
多孔質ガラス、セラミツク、多孔質金属などを用
いることができる。
前記実施例においては、廃水の流入管を槽の下
部に、処理水の流出管を上部に設けたが、これに
限らず取付けた位置を逆にしてもよい。また、処
理水の流出管をポンプ１２の吐出側に分岐して設
けてもよい。
〔発明の効果〕
この発明によれば、コンパクトな装置で短時間
で廃水中の窒素を除去することができる。
In the above examples, polyacrylamide gel was used as a carrier for immobilizing nitrifying bacteria or denitrifying bacteria, but other materials such as calcium alginate, k-carrageenan, agar gel, and photocurable resin may also be used. Further, by installing a hollow fiber membrane in the aerobic zone and using the effluent that passes through the membrane as treated water, suspended solids can be almost completely removed. Membrane materials include sulfonated polysulfone,
Porous glass, ceramic, porous metal, etc. can be used. In the embodiment described above, the wastewater inflow pipe was provided at the bottom of the tank, and the treated water outflow pipe was provided at the top, but the installation position is not limited to this and may be reversed. Further, the outflow pipe of the treated water may be branched and provided on the discharge side of the pump 12. [Effects of the Invention] According to the present invention, nitrogen in wastewater can be removed in a short time using a compact device.
第１図は従来の生物学的窒素除去装置のフロー
シート、第２図は硝化菌固定アクリルアミドゲル
によるNH4−Ｎの処理性能、第３図は脱窒菌固
定アクリルアミドゲルによるNO3−Ｎの処理性
能、第４図はこの発明に係る廃水の生物学的窒素
除去装置の１実施例の断面図を示す。
１……槽体、２……流入管、３……支持材、４
……網目スクリーン、５……嫌気性ゾーン、６…
…脱窒菌を固定した担体、７……好気性ゾーン、
８……散気装置、９……硝化菌を固定した担体、
１０……流出管、１１……配管、１２……ポン
プ、１３……汚泥引抜管。
Figure 1 is a flow sheet of a conventional biological nitrogen removal device, Figure 2 is the treatment performance of NH 4 -N by nitrifying bacteria-immobilized acrylamide gel, and Figure 3 is the treatment of NO 3 -N by denitrifying bacteria-immobilized acrylamide gel. PERFORMANCE FIG. 4 shows a cross-sectional view of one embodiment of the wastewater biological nitrogen removal device according to the present invention. 1... Tank body, 2... Inflow pipe, 3... Support material, 4
...Mesh screen, 5...Anaerobic zone, 6...
...Carrier with fixed denitrifying bacteria, 7...Aerobic zone,
8... Air diffuser, 9... Carrier with fixed nitrifying bacteria,
10...Outflow pipe, 11...Piping, 12...Pump, 13...Sludge drawing pipe.
Claims (1)
槽の下部を脱窒菌の固定化担体を充填した嫌気性
ゾーン、上部を硝化菌の固定化担体を充填した好
気性ゾーンとし、窒素分を含む廃水を前記嫌気性
ゾーンから好気性ゾーンへと上向流で循環させる
ようにしたことを特徴とする廃水の生物学的窒素
除去装置。 ２ 前記嫌気性ゾーンの下方に汚泥引抜管を備え
た汚泥沈降ゾーンを備えたことを特徴とする特許
請求の範囲第１項記載の廃水の生物学的窒素除去
装置。[Scope of Claims] 1. A single tank partitioned into upper and lower parts by a mesh screen, the lower part of which is an anaerobic zone filled with an immobilized carrier for denitrifying bacteria, and the upper part an aerobic zone filled with an immobilized carrier for nitrifying bacteria. A biological nitrogen removal device for wastewater, characterized in that the wastewater containing nitrogen is circulated in an upward flow from the anaerobic zone to the aerobic zone. 2. The biological nitrogen removal device for wastewater according to claim 1, further comprising a sludge settling zone provided with a sludge drawing pipe below the anaerobic zone.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59041279A JPS60187396A (en) | 1984-03-06 | 1984-03-06 | Apparatus for biologically removing nitrogen in waste water |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59041279A JPS60187396A (en) | 1984-03-06 | 1984-03-06 | Apparatus for biologically removing nitrogen in waste water |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60187396A JPS60187396A (en) | 1985-09-24 |
| JPH0137988B2 true JPH0137988B2 (en) | 1989-08-10 |
Family
ID=12604006
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59041279A Granted JPS60187396A (en) | 1984-03-06 | 1984-03-06 | Apparatus for biologically removing nitrogen in waste water |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60187396A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005005327A1 (en) * | 2003-07-10 | 2005-01-20 | Ebara Corporation | Water purification high-level treatment method and apparatus |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2604990B1 (en) * | 1986-10-01 | 1991-04-05 | Omnium Traitement Valorisa | PROCESS FOR THE PURIFICATION, BY A BIOLOGICAL WAY, OF WASTEWATER ON A BED OF GRANULAR MATERIAL |
| JPH0248198U (en) * | 1988-09-30 | 1990-04-03 | ||
| JPH03258396A (en) * | 1990-03-08 | 1991-11-18 | Ebara Infilco Co Ltd | Sewage treating device |
| JPH0461993A (en) * | 1990-06-28 | 1992-02-27 | Ebara Infilco Co Ltd | Method and apparatus for biological nitration and denitrification of organic polluted water |
| FR2669917B1 (en) * | 1990-12-03 | 1993-07-16 | Degremont Sa | BIOLOGICAL OXIDATION AND REDUCTION REACTOR, BIOFILTRATION METHOD AND WASHING METHODS USED IN THIS REACTOR. |
| JPH06142668A (en) * | 1992-11-02 | 1994-05-24 | Ebara Infilco Co Ltd | Purifying treatment device for organic sewage |
| KR20010103887A (en) * | 2000-05-09 | 2001-11-24 | 김홍렬 | Waste water processing device used as the device for eliminating nitrogen and organic materials |
| JP4581211B2 (en) * | 2000-10-05 | 2010-11-17 | 栗田工業株式会社 | Biological denitrification equipment |
| JP2010269203A (en) * | 2009-05-19 | 2010-12-02 | Nikkiso Co Ltd | Waste water treatment apparatus and method of controlling the same |
| CN104609550B (en) * | 2013-11-05 | 2017-03-01 | 中国石油化工股份有限公司 | A kind of method that immobilized sludge granule removes ammonia nitrogen in waste water |
| JP7063770B2 (en) * | 2018-08-21 | 2022-05-09 | 積水化学工業株式会社 | Wastewater treatment equipment |
-
1984
- 1984-03-06 JP JP59041279A patent/JPS60187396A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005005327A1 (en) * | 2003-07-10 | 2005-01-20 | Ebara Corporation | Water purification high-level treatment method and apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60187396A (en) | 1985-09-24 |
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| EXPY | Cancellation because of completion of term |