JPS6372397A - Biological denitrification of waste water - Google Patents
Biological denitrification of waste waterInfo
- Publication number
- JPS6372397A JPS6372397A JP12980787A JP12980787A JPS6372397A JP S6372397 A JPS6372397 A JP S6372397A JP 12980787 A JP12980787 A JP 12980787A JP 12980787 A JP12980787 A JP 12980787A JP S6372397 A JPS6372397 A JP S6372397A
- Authority
- JP
- Japan
- Prior art keywords
- denitrification
- denitrifying
- wastewater
- aerobic
- medium
- 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
- 239000002351 wastewater Substances 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 claims abstract description 64
- 241000894006 Bacteria Species 0.000 claims abstract description 40
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 15
- 230000007423 decrease Effects 0.000 claims abstract description 11
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 7
- 208000035404 Autolysis Diseases 0.000 claims description 14
- 206010057248 Cell death Diseases 0.000 claims description 14
- 230000028043 self proteolysis Effects 0.000 claims description 14
- 230000029087 digestion Effects 0.000 claims description 8
- 239000007788 liquid Substances 0.000 claims description 5
- 238000001514 detection method Methods 0.000 claims description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 3
- 239000001301 oxygen Substances 0.000 claims description 3
- 229910052760 oxygen Inorganic materials 0.000 claims description 3
- 230000003287 optical effect Effects 0.000 claims 1
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 abstract description 30
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 15
- 238000012546 transfer Methods 0.000 abstract description 8
- 230000018044 dehydration Effects 0.000 abstract description 3
- 238000006297 dehydration reaction Methods 0.000 abstract description 3
- 229910002651 NO3 Inorganic materials 0.000 abstract 3
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 abstract 3
- 238000000354 decomposition reaction Methods 0.000 abstract 1
- 238000006396 nitration reaction Methods 0.000 abstract 1
- 230000000644 propagated effect Effects 0.000 abstract 1
- 230000001580 bacterial effect Effects 0.000 description 6
- 238000007796 conventional method Methods 0.000 description 3
- 230000001546 nitrifying effect Effects 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 238000004065 wastewater treatment Methods 0.000 description 2
- 244000061354 Manilkara achras Species 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000010800 human waste Substances 0.000 description 1
- 239000010842 industrial wastewater Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 229910017464 nitrogen compound Inorganic materials 0.000 description 1
- 150000002830 nitrogen compounds Chemical class 0.000 description 1
- 238000006864 oxidative decomposition reaction Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 230000002062 proliferating effect Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
Landscapes
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、下水、し尿、産業廃水、その他の排水などの
有機性廃水を生物学的に浄化処理する方法、特に脱窒工
程の粒状媒体上に付着した脱窒素菌を利用して脱窒する
廃水の生物学的脱窒法に関するものである。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for biologically purifying organic wastewater such as sewage, human waste, industrial wastewater, and other wastewater, and in particular to a granular medium for the denitrification process. This relates to a biological denitrification method for wastewater that utilizes denitrifying bacteria attached to the wastewater.
この生物学的脱窒法は活性汚泥法と活性炭、砂などを媒
体としてこれに微生物を付着して利用する生物固定床法
に大別されるが、設置面積に制限のある処理施設では、
硝化菌、脱窒素菌を純粋かつ高濃度に維持でき、装置の
縮小が可能な固定床法が実用化されている。従来の固定
床法の脱窒処理は通常廃水中の窒素化合物、例えばＮＨ
，を硝化工程でＮＯ□あるいはＮ０１（以下ＮＯｘとす
る）に硝化したのち、脱窒素菌が付着した粒状媒体によ
って固定層あるいは流動層の形成されている脱窒工程で
ＮＯ８をＮ２ガスにまで還元分解（脱窒）するものであ
る。This biological denitrification method is broadly divided into the activated sludge method and the biological fixed bed method, which uses activated carbon, sand, etc. as a medium and attaches microorganisms to it, but in treatment facilities with limited installation space,
A fixed bed method has been put into practical use that allows nitrifying bacteria and denitrifying bacteria to be maintained in a pure and highly concentrated manner and allows for downsizing of equipment. Conventional fixed bed denitrification treatment usually removes nitrogen compounds in wastewater, such as NH
, is nitrified to NO□ or NO1 (hereinafter referred to as NOx) in the nitrification process, and then NO8 is reduced to N2 gas in the denitrification process in which a fixed bed or fluidized bed is formed using granular media to which denitrifying bacteria are attached. It decomposes (denitrifies).
この従来方法で発生する余剰菌の処理は、粒状媒体を再
利用するため、媒体を脱窒工程より引抜いた後、前記媒
体に付着した菌体と媒体とを分離し、媒体は脱窒工程に
返送し、一方菌体は脱水、乾燥、焼却されるが、この方
法は媒体に対する菌体の付着が強力なため剥離に大きな
エネルギーを必要とするし、また剥離された菌体は純粋
培養化されているので極めて脱水性が悪い等の欠点があ
る。In order to reuse the granular media in this conventional method, after the media is pulled out from the denitrification process, the bacteria adhering to the medium are separated from the media, and the media is sent to the denitrification process. The bacterial cells are then dehydrated, dried, and incinerated, but this method requires a large amount of energy to detach the bacterial cells because they adhere strongly to the medium, and the detached bacterial cells are not converted into pure cultures. Because of this, it has drawbacks such as extremely poor dehydration properties.
また嫌気的消化法を利用して、媒体上の菌体を可溶化し
、媒体より分離する方法でも菌体の可溶化に長時間を要
するうえ消化脱離液の再処理が必要であるという欠点を
存する。いずれにしてもこのような従来の余剰閏の処理
法は操作が煩雑であるうえ前記欠点があり当業界にとっ
て憂慮されている問題であった。とりわけ余剰脱窒素菌
の処理法の改良が大きな問題となっているが、これは、
利用する硝化菌の増殖量が０．１増殖菌ｆｔ／ＮＨ４−
Ｎ（ｇ／ｇ）であるのに対し、脱窒素菌の増殖量は、菌
体収率の小さいメタノール資化性脱窒素菌でも０．４増
殖菌量／ＮＯゴーＮ （ｇ／ｇ）と、除去窒素あたり硝
化菌の４倍量にも達するためである。In addition, the method of using anaerobic digestion to solubilize the bacterial cells on the medium and separate them from the medium has the disadvantage that it takes a long time to solubilize the bacterial cells and that the digestion solution must be reprocessed. exists. In any case, such conventional methods for disposing of surplus threads are complicated in operation and have the above-mentioned drawbacks, which are problems that are of concern to the industry. In particular, improving the treatment method for surplus denitrifying bacteria is a major issue;
The growth rate of the nitrifying bacteria used is 0.1 ft/NH4-
N (g/g), whereas the growth rate of denitrifying bacteria is 0.4 amount of proliferating bacteria/NOgoN (g/g) even with methanol-assimilating denitrifying bacteria with a small bacterial cell yield. This is because the amount of nitrogen removed reaches four times that of nitrifying bacteria.
また、脱窒素剤としてのメタノールは窒素分の流入変動
に対処しろるように過剰に添加されるが、残留するメタ
ノールは処理水のＢＯＤ成分となるため、これをさらに
工程を設けて除去しなければならない等欠点があった。In addition, methanol as a denitrifying agent is added in excess to cope with fluctuations in nitrogen inflow, but the remaining methanol becomes a BOD component of the treated water, so it must be removed in an additional process. There were some drawbacks, such as not being able to do so.
本発明は、これら従来法の諸欠点を解消するものであり
、脱窒処理水の浄化と余剰菌体の処理処分とを極めて闇
単に行うことのできる好効な廃水の生物学的脱窒法を提
供することを目的とするものである。The present invention solves the various drawbacks of these conventional methods, and provides an effective biological denitrification method for wastewater that can purify denitrified water and process and dispose of surplus bacteria in an extremely simple manner. The purpose is to provide
本発明は粒状媒体に付着した脱窒菌を利用して酸化態窒
素（ＮＯＸ Ｎ）を廃水中から除去するに際し、廃水
を嫌気的条件下にある脱窒工程の次に好気的自己消化工
程を経て処理すると共に、前記脱窒工程及び／又は好気
的消化工程の粒状媒体の層高の増減を検知し、その検知
によって前記脱窒工程の粒状媒体に付着した余剰脱窒素
菌を好気的自己消化工程に移送し８亥脱窒素菌を空気（
酸素）存在下で脱窒素菌の持つ自己消化能力で酸化分解
したのち、粒状媒体を前記脱窒工程へ返送することを特
徴とする廃水の生物学的脱窒法である。The present invention utilizes denitrifying bacteria attached to granular media to remove oxidized nitrogen (NOX N) from wastewater, and the wastewater is subjected to an aerobic autolysis step after a denitrification step under anaerobic conditions. At the same time, an increase or decrease in the layer height of the granular media in the denitrification process and/or aerobic digestion process is detected, and by this detection, excess denitrifying bacteria attached to the granular media in the denitrification process are aerobically treated. The denitrifying bacteria were transferred to the autolysis process and exposed to air (
This is a biological denitrification method for wastewater, which is characterized in that the granular medium is oxidized and decomposed by the self-extinguishing ability of denitrifying bacteria in the presence of oxygen) and then returned to the denitrification process.
次に本願発明の実施Ｂ様を第１図及び第２図を参照して
説明すると、ＮＨｆｆを含有する廃水１は全部又は一部
が硝化工程２でＮＯｌに硝化され、ＮＯ３のみを含有す
る硝化水３は、メタノール４とともに脱窒工程５に流入
し脱窒され、漏洩するメタノール４′は好気的自己消化
工程６で酸化除去され、窒素も ＢＯＤ成分も除去され
た処理水９は放流される。この場合、前記廃水１は必要
に応じその一部又は全部がバイパス流路１′で直接前記
脱窒工程５に流入して処理することができる。Next, implementation B of the present invention will be explained with reference to FIGS. 1 and 2. The wastewater 1 containing NHff is nitrified in whole or in part to NOl in the nitrification step 2, and the wastewater 1 containing only NO3 is nitrified. Water 3 flows into denitrification process 5 together with methanol 4 and is denitrified, leaked methanol 4' is oxidized and removed in aerobic autolysis process 6, and treated water 9 from which both nitrogen and BOD components have been removed is discharged. Ru. In this case, part or all of the wastewater 1 can be directly flowed into the denitrification process 5 through the bypass channel 1' and treated, if necessary.
一方前記脱窒工程５で増殖した余剰の脱窒素菌は粒状媒
体とともに流出水に同伴して媒体移送管７を経て好気的
自己消化工程６に移送され、残留するメタノール４の除
去と同時に自己酸化分解によって媒体上の脱窒素菌は次
第にその量を減少する。この脱窒素菌の減少した媒体は
媒体移送管８を経て好気的自己消化工程６から前記脱窒
工程５に移送される。このように媒体上の脱窒素菌は脱
窒工程５と好気的自己消化工程６とを経由しながら増加
、減少を操り返し、脱窒工程５の脱窒素菌を定量的に保
持することができ、水質良好な処理水９として好気的自
己消化工程６から効率よく得られるものである。On the other hand, excess denitrifying bacteria grown in the denitrification process 5 are transported to the aerobic autolysis process 6 through the medium transfer pipe 7 along with the granular medium in the outflow water, and at the same time the remaining methanol 4 is removed and the denitrification bacteria are removed. Due to oxidative decomposition, the amount of denitrifying bacteria on the medium gradually decreases. This medium containing denitrifying bacteria is transferred from the aerobic autolysis process 6 to the denitrification process 5 via the medium transfer pipe 8. In this way, the denitrifying bacteria on the medium increase and decrease through the denitrification process 5 and the aerobic autolysis process 6, and the denitrifying bacteria in the denitrification process 5 can be quantitatively retained. The treated water 9 with good water quality can be efficiently obtained from the aerobic autolysis step 6.
なお、前記脱窒工程５の粒状媒体の移送は、脱窒工程流
出水とともに行うと便利であり、その時期は粒状媒体の
層高を監視し、層高が増大して媒体が溢流する前に手動
的移送を行ってもよいが、このような肉眼による手動的
移送の他に、長期間無人運転をする場合には自動移送、
例えば脱窒工程、好気的消化工程の媒体の層高（固液界
面）の増減を光の透過率あるいは他の手段による界面計
その他のセンサーを用いて検知し、移送するのが都合が
よい。Note that it is convenient to transfer the granular media in the denitrification process 5 together with the denitrification process effluent, and at that time, the bed height of the granular media should be monitored, and before the bed height increases and the medium overflows. However, in addition to such manual transfer with the naked eye, automatic transfer,
For example, it is convenient to detect the increase or decrease in the layer height (solid-liquid interface) of the medium in the denitrification process or aerobic digestion process using an interfacial meter or other sensor based on light transmittance or other means, and then transport the medium. .
いずれにしてもこれら検知によって送液流量制御するよ
うにして好気的自己消化工程６に移送するようにする。In any case, the flow rate of the liquid is controlled based on these detections, and the liquid is transferred to the aerobic autolysis step 6.
また、前記好気的自己消化工程６からの移送は、脱窒素
菌の減少による層高の低下を検知して脱窒工程５へ移送
すればよい。Moreover, the transfer from the aerobic autolysis step 6 may be performed by detecting a decrease in the layer height due to a decrease in denitrifying bacteria and transferring to the denitrifying step 5.
本発明は、粒状媒体に付着した脱窒菌を利用して酸化態
窒素（ＮＯＸ−Ｎ）を廃水中から除去するに際し、廃水
を嫌気的条件下にある脱窒工程の次に好気的自己消化工
程を経て処理すると共に、前記脱窒工程及び／又は好気
的消化工程の粒状媒体の層高の増減を検知しその検知に
よって、前記脱窒工程の粒状媒体に付着した余剰脱窒素
菌を好気的自己消化工程に移送し該脱窒素菌を空気（酸
素）存在下で脱窒素閑の持つ自己消化能力で酸化分解し
たのち、粒状媒体を前記脱窒工程へ返送することにより
必要に応し長期間無人運転も可能となり、脱窒処理水の
浄化が著しく高効率にでき、その廃水処理に余剰菌体の
分離装置、脱水、乾燥装置、焼却炉などの菌体の処理設
備も不要となり、しかも余剰脱窒素菌の処理は媒体を好
気的自己消化工程に移送するだけなので極めて簡単であ
って運転管理も容易で余剰脱窒素菌の処理と同時に脱窒
処理水の浄化も行うことができるので、余剰脱窒素菌の
処理処分に付随する従来の欠点を解消し、大幅に改良化
された脱窒処理法とすることができ、余剰脱窒素菌と残
留メタノールの合理的処理と経済的な処理が可能である
。The present invention utilizes denitrifying bacteria attached to granular media to remove oxidized nitrogen (NOX-N) from wastewater. In addition to processing through the steps, an increase or decrease in the layer height of the granular media in the denitrification step and/or aerobic digestion step is detected, and by this detection, surplus denitrifying bacteria attached to the granular media in the denitrification step are eliminated. After transferring the denitrifying bacteria to the pneumatic autolysis process and oxidizing and decomposing the denitrifying bacteria in the presence of air (oxygen) using the self-extinguishing ability of the denitrifier, the granular medium is returned to the denitrifying process to perform treatment as necessary. Unmanned operation for long periods of time is possible, and the purification of denitrified water becomes extremely efficient, eliminating the need for equipment for separating excess bacteria, dehydration, drying equipment, incinerators, and other bacteria treatment equipment for wastewater treatment. Moreover, the treatment of surplus denitrifying bacteria is extremely simple as it only involves transferring the medium to the aerobic autolysis process, and operation management is also easy, and the denitrification treated water can be purified at the same time as the treatment of surplus denitrifying bacteria. Therefore, the conventional drawbacks associated with the treatment and disposal of surplus denitrifying bacteria can be eliminated, and a significantly improved denitrification treatment method can be created, allowing for the rational treatment and economical treatment of surplus denitrifying bacteria and residual methanol. Processing is possible.
〔実施例］ 次に本発明の実施例を示す。〔Example] Next, examples of the present invention will be shown.
実験装置
流動層式脱窒塔 ５０１ 円筒カラム ２本（φ２００
ｍｍ、高さ１６００ｍｍ を効容積５０．２１２）実
験条件
実験廃水 人工硝化液 Ｎ０２−Ｎ ３０■／ｉ？
（脱塩素水道水にｊｌａＮＯｉを添加して調整したもの
）
廃水処理量 １０００β／日
流動層媒体 砂
流動層面■は流動層層高をもって増減をみた実験開始時
の流動層層高
脱 窒 塔 ４００龍
好気的消化塔 １０００ｍ
メタノール添加量 ９０ｇ／日
以丁余白
実験拮果
表−１
の媒体をそれぞれに移送したことを表わす。Experimental equipment Fluidized bed denitrification tower 501 2 cylindrical columns (φ200
mm, height 1600mm effective volume 50.212) Experimental conditions Experimental wastewater Artificial nitrification liquid N02-N 30■/i?
(Adjusted by adding jlaNOi to dechlorinated tap water) Wastewater treatment amount 1000β/day Fluidized bed medium Sand fluidized bed surface ■ changes with fluidized bed height Fluidized bed high denitrification tower at the start of the experiment 400 Aerobic digestion tower 1000m Methanol addition amount 90g/day This indicates that the medium shown in Table 1 was transferred to each of the towers.
註−２，実験猜寵串べｍ符鰭附は諭内の媒体は十分に付
着したものである。Note 2: Experimental skewers with fins are those in which the medium is sufficiently attached.
図面は本発明方法の実施例を示し、第１図は系統説明図
、第２図は他の実施例の系統説明図である。
１・・・廃水、２・・・硝化工程、３・・・硝化水、４
．４′・・・メタノール、５・・・脱窒工程、６・・・
好気的自己消化工程、７．８・・・媒体移送管、９・・
・処理水。
特許出願人 荏原インフィルコ株式会社代理人
弁理士 高 木 正 行代理人弁理士
依 １） 孝 次 部第１図
Ｌ′
筑２図The drawings show an embodiment of the method of the present invention, with FIG. 1 being a system explanatory diagram and FIG. 2 being a system explanatory diagram of another embodiment. 1... Wastewater, 2... Nitrification process, 3... Nitrified water, 4
．． 4'...methanol, 5...denitrification process, 6...
Aerobic autolysis process, 7.8... Media transfer tube, 9...
- Treated water. Patent applicant: Ebara Infilco Co., Ltd. Representative Patent Attorney Masayuki Takagi Representative Patent Attorney
1) Takatsugu Part 1 Figure L' Chiku 2 Figure
Claims (3)
（ＮＯ＿ｘ−Ｎ）を廃水中から除去するに際し、廃水を
嫌気的条件下にある脱窒工程の次に好気的自己消化工程
を経て処理すると共に、前記脱窒工程及び／又は好気的
消化工程の粒状媒体の層高の増減を検知しその検知によ
って、前記脱窒工程の粒状媒体に付着した余剰脱窒素菌
を好気的自己消化工程に移送し該脱窒素菌を空気（酸素
）存在下で脱窒素菌の持つ自己消化能力で酸化分解した
のち、粒状媒体を前記脱窒工程へ返送することを特徴と
する廃水の生物学的脱窒法。(1) When removing oxidized nitrogen (NO_x-N) from wastewater using denitrifying bacteria attached to granular media, the denitrification process in which the wastewater is placed under anaerobic conditions is followed by an aerobic self-digestion process. At the same time, an increase or decrease in the layer height of the granular media in the denitrification process and/or aerobic digestion process is detected, and by this detection, excess denitrifying bacteria attached to the granular media in the denitrification process are aerobically removed. The wastewater is transferred to a denitrification process, where the denitrification bacteria are oxidized and decomposed in the presence of air (oxygen) by the autolysis ability of the denitrification bacteria, and then the granular medium is returned to the denitrification process. Biological denitrification method.
を返送するのに、該脱窒工程及び／又は好気的消化工程
の粒状媒体の層高の増減を検知して行われるものである
特許請求の範囲第１項記載の廃水の脱窒法。(2) Returning the granular media from the aerobic autolysis step to the denitrification step is carried out by detecting an increase or decrease in the layer height of the granular media in the denitrification step and/or aerobic digestion step. A method for denitrifying wastewater according to claim 1.
媒体の層高の増減を検知し、送液流量制御を自動的に行
うものである特許請求の範囲第１項又は第２項記載の廃
水の脱窒法。(3) In the step of transferring the granular medium, an increase or decrease in the layer height of the medium is detected by an optical system means, and the liquid feeding flow rate is automatically controlled. Wastewater denitrification method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12980787A JPS6372397A (en) | 1987-05-28 | 1987-05-28 | Biological denitrification of waste water |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12980787A JPS6372397A (en) | 1987-05-28 | 1987-05-28 | Biological denitrification of waste water |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10041479A Division JPS5626591A (en) | 1979-08-07 | 1979-08-07 | Biological denitrifying method for waste water |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6372397A true JPS6372397A (en) | 1988-04-02 |
| JPS6354440B2 JPS6354440B2 (en) | 1988-10-27 |
Family
ID=15018709
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12980787A Granted JPS6372397A (en) | 1987-05-28 | 1987-05-28 | Biological denitrification of waste water |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6372397A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008023485A (en) * | 2006-07-24 | 2008-02-07 | Japan Organo Co Ltd | Biological denitrification method and apparatus therefor |
-
1987
- 1987-05-28 JP JP12980787A patent/JPS6372397A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008023485A (en) * | 2006-07-24 | 2008-02-07 | Japan Organo Co Ltd | Biological denitrification method and apparatus therefor |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6354440B2 (en) | 1988-10-27 |
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