JP2552991B2 - Water denitrification treatment method - Google Patents
Water denitrification treatment methodInfo
- Publication number
- JP2552991B2 JP2552991B2 JP20758292A JP20758292A JP2552991B2 JP 2552991 B2 JP2552991 B2 JP 2552991B2 JP 20758292 A JP20758292 A JP 20758292A JP 20758292 A JP20758292 A JP 20758292A JP 2552991 B2 JP2552991 B2 JP 2552991B2
- Authority
- JP
- Japan
- Prior art keywords
- treatment
- treatment tank
- denitrification
- tank
- aerobic
- 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 - Fee Related
Links
- 238000011282 treatment Methods 0.000 title claims description 65
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims description 21
- 238000000034 method Methods 0.000 title claims description 15
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 24
- 239000002984 plastic foam Substances 0.000 claims description 10
- 239000006260 foam Substances 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 241000894006 Bacteria Species 0.000 description 4
- 238000004891 communication Methods 0.000 description 4
- 229910052757 nitrogen Inorganic materials 0.000 description 4
- 238000001914 filtration Methods 0.000 description 3
- 230000001546 nitrifying effect Effects 0.000 description 3
- 238000011001 backwashing Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000010840 domestic wastewater Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 235000006481 Colocasia esculenta Nutrition 0.000 description 1
- 240000004270 Colocasia esculenta var. antiquorum Species 0.000 description 1
- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 description 1
- 239000003830 anthracite Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 238000012851 eutrophication Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000000852 hydrogen donor Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 230000000813 microbial effect Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 210000002700 urine Anatomy 0.000 description 1
- 239000011800 void material 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
Landscapes
- Biological Treatment Of Waste Water (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は水の脱窒処理方法に関
し、特に、生活排水中の窒素の除去を行うための水の脱
窒処理方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water denitrification treatment method, and more particularly to a water denitrification treatment method for removing nitrogen in domestic wastewater.
【０００２】[0002]
【従来の技術】近年、富栄養化防止の面から、生活排水
中の窒素の除去が重要視されている。ＢＯＤ・ＣＯＤ・
ＳＳ・Ｐの除去に有効であるプラスチック発泡体浮遊層
による水中の異物の分離法では、ＮＨ4−ＮやＮＯ3−Ｎ
等の窒素分の除去ができない。また、アンスラサイトろ
過や無機発泡体による脱窒処理が試みられているが、こ
れらの方法では、下向き流処理のためや、比重が重いこ
とによる逆流の頻度増大と難易性とから、高密度生物膜
処理が難しく、ＢＯＤ値を１０ｍｇ／リットル以下まで
に処理することが困難である。2. Description of the Related Art In recent years, removal of nitrogen in domestic wastewater has been emphasized from the viewpoint of preventing eutrophication. BOD / COD /
In the method of separating foreign matter in water by the plastic foam floating layer, which is effective for removing SS / P, NH 4 -N and NO 3 -N are used.
It is not possible to remove the nitrogen content. In addition, anthracite filtration and denitrification treatment with inorganic foams have been attempted.However, in these methods, due to the downward flow treatment and due to the increased frequency of backflow and the difficulty due to heavy specific gravity, high density organisms Membrane treatment is difficult, and it is difficult to treat BOD value up to 10 mg / liter or less.
【０００３】一方、プラスチックろ材の流動層による好
気処理も行われているが、高密度生物膜ろ過の作用が働
かないため、同様にＢＯＤ値を１０ｍｇ／リットル以下
にするまでには、滞留時間を長時間（例えば４乃至５時
間）取らなければならず、生物処理後の凝集沈澱も必要
で経済性に問題がある。また、脱窒のために硝化菌をペ
レット内に封じ込め、硝化促進をする包括法も行われて
いるが、流動床であるため、生物膜ろ化作用が働かず、
前処理の問題も不完全であり、装置が大型化となり、装
置が高騰化し、特殊な場合にのみ採用し得るという問題
がある。On the other hand, although aerobic treatment with a fluidized bed of a plastic filter medium is also performed, since the action of high-density biofilm filtration does not work, similarly, a residence time is required until the BOD value becomes 10 mg / liter or less. Is required for a long time (for example, 4 to 5 hours), and coagulation and precipitation after biological treatment is also required, which is a problem in economic efficiency. In addition, a comprehensive method of encapsulating nitrifying bacteria in the pellets for denitrification and promoting nitrification is also performed, but since it is a fluidized bed, biofilm filtration action does not work,
The problem of pretreatment is also incomplete, and there is a problem that the apparatus becomes large in size, the apparatus rises in price, and can be used only in special cases.
【０００４】[0004]
【発明が解決しようとする課題】このような従来技術の
問題点に鑑み、本発明の主な目的は、ＢＯＤ値をより一
層低減しかつ脱窒処理を行うべく改良された水の脱窒方
法を提供することにある。SUMMARY OF THE INVENTION In view of the above problems of the prior art, the main object of the present invention is to improve the denitrification method of water by further reducing the BOD value and performing denitrification treatment. To provide.
【０００５】[0005]
【課題を解決するための手段】このような目的は、本発
明によれば、原水を好気処理を行うべくプラスチック発
泡体浮遊層を設けた第１の処理槽に上向き流で通過させ
る過程と、前記第１の処理槽を通過した処理水を好気性
及び嫌気性の中間状態にて硝化処理を行うべくプラスチ
ック発泡体浮遊層を設けた第２の処理槽に上向き流で通
過させる過程と、前記第２の処理槽を通過した処理水を
プラスチック発泡体浮遊層を設けた第３の処理槽に送る
途中でメタノールを混入する過程と、前記メタノールを
混入された処理水を嫌気性状態にて脱窒処理を行うべく
前記第３の処理槽に上向き流で通過させる過程と、前記
第３の処理槽を通過した処理水を放流する過程とを有す
ることを特徴とする水の脱窒処理方法を提供することに
より達成される。According to the present invention, such an object is achieved by allowing raw water to pass in an upward flow to a first treatment tank provided with a plastic foam floating layer for aerobic treatment.
That the excessive degree, the first treated water aerobic passing through the treatment bath
And an over extent that is passed in upflow to the second treatment tank having a Plasti <br/> click foam floating layer in order to perform the nitrification treatment was provided in an anaerobic intermediate state, the second treatment tank A process of mixing methanol in the middle of sending the treated water that has passed through to a third treatment tank having a plastic foam floating layer, and performing denitrification treatment of the treated water mixed with the methanol in an anaerobic state. br /> the steps of Ru passed in upflow to the third treatment tank, wherein
Is achieved by providing a denitrification process how the water; and a step of discharge of the treated water which has passed through the third treatment tank.
【０００６】[0006]
【作用】このようにすれば、第１の処理槽においてプラ
スチック発泡体浮遊層で好気処理が行われてＢＯＤ値を
低下させることができると共に、高密度硝化菌の育成と
接触効率の良い脱窒処理とを組み合わせることができ
る。好気処理槽に於て逆洗の頻度を少なくし、高密度生
物膜を形成するために、発泡体の粒子形・表面積・空間
率を適切化することにより、プラスチック発泡体浮遊層
に上向き流処理により第２の処理槽における好気性及び
嫌気性の中間状態による処理と第３の処理槽における嫌
気処理とを行って脱窒処理を行うことができる。By doing so, aerobic treatment is carried out in the plastic foam floating layer in the first treatment tank to reduce the BOD value, and at the same time, to grow high-density nitrifying bacteria. It can be combined with denitrification treatment with good contact efficiency . In order to reduce the frequency of backwashing in an aerobic treatment tank and form a high-density biofilm, by optimizing the particle shape, surface area, and porosity of the foam, the upward flow to the plastic foam floating layer. aerobic in the second treatment tank Ri by the processing and
It is possible to perform the denitrification process by performing a disgusting <br/> gas processing in that by the intermediate state of the anaerobic treatment and the third treatment tank.
【０００７】[0007]
【実施例】以下、本発明の好適実施例を添付の図面につ
いて詳しく説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will now be described in detail with reference to the accompanying drawings.
【０００８】図１は、本発明に基づく水用脱窒装置を模
式的に示す図である。図１に於て、タンク１からポンプ
２で組み上げられた原水が、本装置の第１の処理槽３の
下部に送水されるようになっている。本装置は、第１の
処理槽３・第２の処理槽４・第３の処理槽５をこの順に
連結・配設してなり、各処理槽３〜５内に、プラスチッ
ク発泡体を浮遊させたろ層３ａ〜５ａをそれぞれ設けら
れている。FIG. 1 is a diagram schematically showing a denitrification apparatus for water according to the present invention. In FIG. 1, raw water assembled by a pump 2 from a tank 1 is sent to the lower part of a first treatment tank 3 of this device. This apparatus comprises a first processing tank 3, a second processing tank 4, and a third processing tank 5 which are connected and arranged in this order, and a plastic foam is suspended in each of the processing tanks 3 to 5. Taro layers 3a to 5a are provided, respectively.
【０００９】第１の処理槽３の下部に送り込まれた原水
は、第１の処理槽３内のろ層３ａを上向き流にて通過
し、第１の処理槽３の上部から連通管６を介して第２の
処理槽４の下部に送られる。第２の処理槽４でも、上記
と同様にそのろ層４ａを上向き流にて通過し、第２の処
理槽４の上部から連通管７を介して第３の処理槽５の下
部に送られ、第３の処理槽５でもそのろ層５ａを上向き
流にて通過し、第３の処理槽５の上部から河川等に放流
される。なお、第２の処理槽４と第３の処理槽５との間
の連通管７には図示されないメタノール供給装置から、
所定量のメタノールが送り込まれるようになっている。
また、第１の処理槽３のろ層３ａの下方には、上方に向
けてエアを吹き出し得るエアノズル８が設けられてい
る。The raw water sent to the lower portion of the first treatment tank 3 passes through the filter layer 3a in the first treatment tank 3 in an upward flow, and flows from the upper portion of the first treatment tank 3 to the communication pipe 6. It is sent to the lower part of the second processing tank 4 via the. In the second treatment tank 4 as well, as in the above, it passes through the filter layer 4a in an upward flow, and is sent from the upper portion of the second treatment tank 4 to the lower portion of the third treatment tank 5 via the communication pipe 7. The third treatment tank 5 also passes through the filter layer 5a in an upward flow and is discharged from the upper portion of the third treatment tank 5 into a river or the like. In addition, a communication pipe 7 between the second processing tank 4 and the third processing tank 5 is provided with a methanol supply device (not shown),
A predetermined amount of methanol is sent in.
An air nozzle 8 that can blow air upward is provided below the filter layer 3a of the first processing tank 3.
【００１０】上記各ろ層３ａ〜５ａを構成するプラスチ
ック発泡体は、その粒子形を不定形とし、ろ材表面積を
８００ｍ2／ｍ3以上とし、かつ空間率を８０％程度にす
ると良い。このようにしてなる脱窒装置では、第１の処
理槽３に於いて好気処理が行われ、第２の処理槽４に於
いて、通常は若干の溶存酸素を例えば３ｐｐｍ程度含む
好気性と嫌気性との中間の雰囲気で硝化処理が行われ、
第３の処理槽５に於いて嫌気性雰囲気で脱窒処理が行わ
れる。The plastic foam forming each of the filter layers 3a to 5a preferably has an indefinite particle shape, a filter medium surface area of 800 m 2 / m 3 or more, and a porosity of about 80%. In the denitrification device thus constructed, aerobic treatment is carried out in the first treatment tank 3, and in the second treatment tank 4, it is normally aerobic containing a small amount of dissolved oxygen, for example, about 3 ppm. Nitrification is performed in an atmosphere between anaerobic and
Denitrification is performed in the third treatment tank 5 in an anaerobic atmosphere.
【００１１】好気処理が行われる第１の処理槽３のろ層
３ａの下部の流水部はＳＳや微生物フロックの濃縮層と
なり、余剰の汚泥を排出しやすくなる。更に、ろ層内で
は高密度のろ層を形成しながら目詰まりが少なく、かつ
気液接触も効率良く行われて、ＢＯＤ値が５ｍｇ／リッ
トル以下の脱窒の前処理としての条件もＢＯＤ負荷３乃
至７kg/m2/日と高負荷で達成することができる。この
際、処理水の沈澱層も不要となる利点も合わせ持つ。The flowing water portion below the filter layer 3a of the first treatment tank 3 in which the aerobic treatment is performed serves as a concentrated layer of SS and microbial flocs, which makes it easy to discharge excess sludge. Furthermore, while forming a high-density filter layer in the filter layer, there is little clogging, and gas-liquid contact is also performed efficiently, and the BOD value is 5 mg / liter or less as the pretreatment for denitrification and the BOD load. It can be achieved at a high load of 3 to 7 kg / m 2 / day. At this time, it also has an advantage that a precipitation layer of treated water is unnecessary.
【００１２】本発明による脱窒性能の比較を一般の嫌気
処理である標準循環法の組合せの場合と比較した表を表
１に示す。Table 1 shows a comparison of the denitrification performance according to the present invention with the case of the combination of the standard circulation method which is a general anaerobic treatment.
【００１３】[0013]
【表１】 [Table 1]
【００１４】表１に示されるように、本発明に基づく脱
窒方法によれば、従来の標準循環法に対して、差異が明
らかである。As shown in Table 1, the denitrification method according to the present invention clearly shows a difference from the conventional standard circulation method.
【００１５】またＴ−Ｎ値が５２ｍｇ／リットルを示す
し尿排水に対して、本装置を用いたＴ−Ｎの除去結果を
測定した。この時の各処理槽の寸法は、その直径と高さ
が３００mm×４５００mmであり、ろ層３ａの厚さが３ｍ
であり、第２の処理槽の直径と高さが４５０mm×４５０
０mmであり、そのろ層４ａの厚さが３ｍであり、第３の
処理槽の直径と高さが４５０mm×４５００mmであり、そ
のろ層５ａの厚さが３ｍであった。そして図１に示され
るように第３の処理槽５の入口では、水素供与体として
メタノールを注入した。その処理結果は、表１に示され
るように、Ｔ−Ｎ値が５２から４．２（ｍｇ／リット
ル）まで処理された。Further, the removal result of TN using this apparatus was measured for urine drainage showing a TN value of 52 mg / liter. At this time, the size of each processing tank is 300 mm × 4500 mm in diameter and height, and the thickness of the filter layer 3 a is 3 m.
And the diameter and height of the second processing tank are 450 mm x 450
The thickness of the filter layer 4a was 3 m, the diameter and height of the third treatment tank was 450 mm × 4500 mm, and the thickness of the filter layer 5a was 3 m. Then, as shown in FIG. 1, methanol was injected as a hydrogen donor at the inlet of the third treatment tank 5. As the result of the treatment, as shown in Table 1, the TN value was treated from 52 to 4.2 (mg / liter).
【００１６】上記した好気処理でのＢＯＤとＳＳの除去
性能を上げると、硝化層での逆洗が不要となり、増殖ス
ピードの遅い硝化の育成のためにＳＲＴを大きくするこ
とができる。このことが前提となり次層での高密度硝化
菌の育成が達成され、かつ第３層を使用して高密度脱窒
菌の育成が実現できる。これら好気・嫌気の組合せは、
前記した第１実施例に示す、第３処理槽５を設け、メタ
ノール等のＢＯＤ源の注入による脱窒法で良い。 If the performance of removing BOD and SS in the above aerobic treatment is improved, backwashing in the nitrification layer becomes unnecessary, and the SRT can be increased to grow nitrification with a slow growth rate. Based on this, the growth of high-density nitrifying bacteria in the next layer can be achieved, and the growth of high-density denitrifying bacteria can be realized by using the third layer. The combination of aerobic and anaerobic is
Shown in the first embodiment described above, the third treatment tank 5 is provided, not good in denitrification by injection of BOD sources such as methanol.
【００１７】いずれにしても、ＮＨ4−ＮをＮ2まで処理
する過程で、いずれの部分もプラスチック浮遊層でろ材
の径を３乃至１５mm、空間率を８０％近く、ろ材を不定
形とした条件を満たし、上向き流処理槽の連結に特徴が
ある。また、この条件を満たすものでなければ、まず好
気処理でのＢＯＤ値が５ｍｇ／リットル以下にするため
には長時間（例えば１０時間以上）の処理を必要とし、
硝化・脱窒処理も同様であり、装置の大型化が不可欠
で、経済性に劣ることになる。In any case, in the process of treating NH 4 -N up to N 2 , the diameter of the filter medium is 3 to 15 mm, the porosity is close to 80%, and the filter medium is indefinite shape in any part. It is characterized by satisfying the conditions and connecting the upward flow treatment tank. If this condition is not satisfied, first, a long-time treatment (for example, 10 hours or more) is required to reduce the BOD value in aerobic treatment to 5 mg / liter or less.
The same applies to nitrification and denitrification, and it is inevitable that the equipment will be large in size, which is not economical.
【００１８】[0018]
【００１９】[0019]
【００２０】このようにして、本発明装置により、高性
能でありかつコンパクトな脱窒装置が提供される。な
お、プラスチック発泡体の浮遊層の空間率が９０％以上
の場合には、本発明のような効率の良い脱窒処理を行う
ことができない。Thus, the device of the present invention provides a high-performance and compact denitrification device. When the void ratio of the floating layer of the plastic foam is 90% or more, the efficient denitrification treatment as in the present invention cannot be performed.
【００２１】[0021]
【発明の効果】このように、本発明によれば、前処理と
しての好気処理によるＢＯＤを所定値（例えば５ｍｇ／
リットル）以下にする処理時間の短縮化が可能であり、
次段以降での硝化・脱窒処理も同様であり、極めて効率
良くかつ経済性に優れた脱窒処理を行うことができる。As described above, according to the present invention, the BOD by the aerobic treatment as the pretreatment is set to a predetermined value (for example, 5 mg /
It is possible to shorten the processing time to less than
The same applies to nitrification and denitrification treatments in the subsequent stages, and denitrification treatments can be performed extremely efficiently and economically.
【図１】本発明に基づく脱窒処理装置を模式的に示す
図。FIG. 1 is a diagram schematically showing a denitrification treatment apparatus according to the present invention.
１ タンク ２ ポンプ ３ 第１の処理槽 ４ 第２の処理槽 ５ 第３の処理槽 ３ａ〜５ａ ろ層 ６・７ 連通管 ８ エアノズル DESCRIPTION OF SYMBOLS 1 Tank 2 Pump 3 1st processing tank 4 2nd processing tank 5 3rd processing tank 3a-5a Filter layer 6 and 7 Communication pipe 8 Air nozzle
Claims (1)
発泡体浮遊層を設けた第１の処理槽に上向き流で通過さ
せる過程と、前記第１の処理槽を通過した処理水を好気
性及び嫌気性の中間状態にて硝化処理を行うべくプラス
チック発泡体浮遊層を設けた第２の処理槽に上向き流で
通過させる過程と、前記第２の処理槽を通過した処理水
をプラスチック発泡体浮遊層を設けた第３の処理槽に送
る途中でメタノールを混入する過程と、前記メタノール
を混入された処理水を嫌気性状態にて脱窒処理を行うべ
く前記第３の処理槽に上向き流で通過させる過程と、前
記第３の処理槽を通過した処理水を放流する過程とを有
することを特徴とする水の脱窒処理方法。And 1. A excessive extent that allowed <br/> pass of upward flow in the first treatment tank provided with a plastic foam floating layer in order to perform the aerobic treatment of the raw water, the first treatment tank passage Treated water is aerobic
An over extent that is passed in upflow to the second treatment tank having a positive <br/> tic foam floating layer in order to perform the nitrification treatment by sex and anaerobic intermediate state, the second treatment tank The process of mixing methanol in the middle of sending the treated water that has passed through to the third treatment tank provided with the plastic foam floating layer and the denitrification treatment of the treated water mixed with the methanol in an anaerobic state should be performed.
Ku said third step of the treatment tank Ru passed in upflow, before
And a step of discharging the treated water that has passed through the third treatment tank .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20758292A JP2552991B2 (en) | 1992-07-09 | 1992-07-09 | Water denitrification treatment method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20758292A JP2552991B2 (en) | 1992-07-09 | 1992-07-09 | Water denitrification treatment method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0639394A JPH0639394A (en) | 1994-02-15 |
| JP2552991B2 true JP2552991B2 (en) | 1996-11-13 |
Family
ID=16542148
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20758292A Expired - Fee Related JP2552991B2 (en) | 1992-07-09 | 1992-07-09 | Water denitrification treatment method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2552991B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100784934B1 (en) * | 2007-06-01 | 2007-12-11 | (주)이엔바이오21 | Recirculating Nutrients Processing Equipment Using Floating Media |
| EP2632862A4 (en) * | 2010-10-27 | 2016-01-27 | Univ Beijing | TREATMENT SYSTEM AND PROCESS FOR PROCESSING WASTE |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS615102A (en) * | 1984-06-19 | 1986-01-10 | 日立プラント建設株式会社 | Monorail branching device |
| JPH0694036B2 (en) * | 1989-12-20 | 1994-11-24 | 荏原インフイルコ株式会社 | Organic wastewater biological treatment equipment |
| JPH0461993A (en) * | 1990-06-28 | 1992-02-27 | Ebara Infilco Co Ltd | Method and apparatus for biological nitration and denitrification of organic polluted water |
-
1992
- 1992-07-09 JP JP20758292A patent/JP2552991B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0639394A (en) | 1994-02-15 |
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