JPH09314184A - Nitrogen removing process for organic sewage - Google Patents
Nitrogen removing process for organic sewageInfo
- Publication number
- JPH09314184A JPH09314184A JP13516296A JP13516296A JPH09314184A JP H09314184 A JPH09314184 A JP H09314184A JP 13516296 A JP13516296 A JP 13516296A JP 13516296 A JP13516296 A JP 13516296A JP H09314184 A JPH09314184 A JP H09314184A
- Authority
- JP
- Japan
- Prior art keywords
- ammonia
- denitrification
- section
- zeolite
- nitrogen
- 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.)
- Pending
Links
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 34
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 17
- 238000000034 method Methods 0.000 title claims description 32
- 239000010865 sewage Substances 0.000 title abstract description 11
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 70
- 239000010802 sludge Substances 0.000 claims abstract description 46
- 229910021529 ammonia Inorganic materials 0.000 claims abstract description 35
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 25
- 238000005342 ion exchange Methods 0.000 claims abstract description 18
- 239000002002 slurry Substances 0.000 claims abstract description 16
- 239000000126 substance Substances 0.000 claims abstract description 15
- 239000002351 wastewater Substances 0.000 claims description 8
- 239000007788 liquid Substances 0.000 claims description 7
- 230000001172 regenerating effect Effects 0.000 claims description 3
- 238000000926 separation method Methods 0.000 claims description 3
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 claims 1
- 239000007787 solid Substances 0.000 claims 1
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 abstract description 36
- 239000010457 zeolite Substances 0.000 abstract description 34
- 229910021536 Zeolite Inorganic materials 0.000 abstract description 32
- MMDJDBSEMBIJBB-UHFFFAOYSA-N [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] Chemical compound [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] MMDJDBSEMBIJBB-UHFFFAOYSA-N 0.000 abstract description 10
- 241000894006 Bacteria Species 0.000 abstract description 9
- 238000004062 sedimentation Methods 0.000 abstract description 5
- 239000010419 fine particle Substances 0.000 abstract description 3
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 abstract description 2
- 229910002651 NO3 Inorganic materials 0.000 abstract 2
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 abstract 2
- -1 for example Chemical compound 0.000 abstract 1
- 238000006396 nitration reaction Methods 0.000 abstract 1
- 230000001546 nitrifying effect Effects 0.000 description 6
- 238000000855 fermentation Methods 0.000 description 5
- 238000001556 precipitation Methods 0.000 description 4
- 238000001179 sorption measurement Methods 0.000 description 4
- 238000007796 conventional method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 238000005273 aeration Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 244000005700 microbiome Species 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 230000008929 regeneration Effects 0.000 description 2
- 238000011069 regeneration method Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 101000713585 Homo sapiens Tubulin beta-4A chain Proteins 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 1
- 102100036788 Tubulin beta-4A chain Human genes 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012851 eutrophication Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 150000007524 organic acids Chemical class 0.000 description 1
- 235000005985 organic acids Nutrition 0.000 description 1
- 239000012492 regenerant Substances 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 238000005063 solubilization Methods 0.000 description 1
- 230000007928 solubilization Effects 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Landscapes
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は下水などのアンモニ
ア含有汚水を高度に浄化する技術に関し、特に窒素成分
を従来技術よりも著しく高い除去率で除去可能で、余剰
汚泥発生量が少ない新規窒素除去技術に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technology for highly purifying ammonia-containing wastewater such as sewage, and in particular, a novel nitrogen removal method capable of removing nitrogen components at a significantly higher removal rate than the conventional technology and producing less excess sludge. Regarding technology.
【０００２】[0002]
【従来の技術】下水などの汚水の窒素を除去する方法と
して最も代表的な技術は、図１に示す硝化液循環型生物
学的硝化脱窒素法である。この技術は有機性汚水を生物
学的脱窒素部に供給し、その脱窒素液を硝化部に供給し
てアンモニアを硝化し、硝化液の一部を脱窒素部に循環
し他部を沈殿槽に供給し活性汚泥を分離し処理水を得る
ものである。硝化部に硝化菌を固定化したグル担体を投
入する技術も最近実用化されている。この方法は下水を
処理する場合窒素除去率８０％程度が得られ、処理水に
はアンモニアはほとんど残らず硝酸性窒素が残留する。
しかし、この方法では窒素除去率を９０％以上にするこ
とは原理的に不可能であり放流水域の富栄養化を防止す
るには不十分であった。また余剰活性汚泥発生量が除去
ＢＯＤ量の３０〜４０％程度と多く、汚泥処理コストが
多額であった。また、アンモニアの化学的除去法として
ゼオライトによる選択的イオン交換吸着法が公知である
が、ゼオライトのアンモニア吸着容量が非常に少なく頻
繁な再生が必要であるほか再生廃液が大量に発生し、こ
の処分も極めて困難であった。そのため実用化された例
は無かった。2. Description of the Related Art The most typical technique for removing nitrogen from wastewater such as sewage is the nitrification solution circulation type biological nitrification denitrification method shown in FIG. This technology supplies organic wastewater to the biological denitrification section, supplies the denitrification solution to the nitrification section to nitrify ammonia, circulates part of the nitrification solution to the denitrification section, and the other part to a precipitation tank. The activated sludge is separated and the treated water is obtained. Recently, a technique of introducing a glu carrier in which nitrifying bacteria are immobilized into the nitrification section has been put into practical use. In this method, when treating sewage, a nitrogen removal rate of about 80% is obtained, and almost no ammonia remains in the treated water, but nitrate nitrogen remains.
However, it is impossible in principle to raise the nitrogen removal rate to 90% or more by this method, and it was insufficient to prevent eutrophication in the discharge water area. In addition, the amount of surplus activated sludge generated was as large as about 30 to 40% of the removed BOD amount, and the sludge treatment cost was large. Also, a selective ion exchange adsorption method using zeolite is known as a method for chemically removing ammonia, but the ammonia adsorption capacity of the zeolite is very small and frequent regeneration is required, and a large amount of regeneration waste liquid is generated, and this disposal Was extremely difficult. Therefore, there were no cases where it was put to practical use.
【０００３】[0003]
【発明が解決しようとする課題】本発明は生物学的窒素
除去法、化学的窒素除去法の欠点を解決し、利点を活用
した新規技術を確立し、安定して窒素除去率９０％以上
を得ることが可能で汚泥発生量も著しく少なくできる新
システムを提供することを課題とする。The present invention solves the drawbacks of the biological nitrogen removal method and the chemical nitrogen removal method, establishes a new technique utilizing the advantages, and stably achieves a nitrogen removal rate of 90% or more. It is an object of the present invention to provide a new system that can be obtained and can significantly reduce the amount of sludge generated.
【０００４】[0004]
【課題を解決するための手段】本発明者は、生物学的脱
窒素法のプロセス構成を変革して選択的イオン交換法を
新規な態様で組み込むことにより上記課題を達成できる
ことを見いだした。即ち、本発明は、アンモニア性窒素
含有有機性排水を生物学的硝化脱窒素法で処理する方法
において、アンモニアに対する選択的イオン交換能を有
する物質を生物処理槽内の活性汚泥に共存せしめ、原水
を生物学的脱窒素部に供給し、該脱窒素部スラリを硝化
部及び固液分離槽に導き活性汚泥を固液分離し、分離汚
泥の一部を生物学的硝化部に返送しアンモニアを吸着し
たアンモニアに対する選択的イオン交換能を有する物質
を生物学的に再生するとともに、沈殿汚泥の他部を嫌気
性発酵せしめたのち脱窒素槽に返送することを特徴とす
る窒素除去方法によって達成されたものである。The present inventor has found that the above object can be achieved by changing the process constitution of the biological denitrification method and incorporating the selective ion exchange method in a novel manner. That is, the present invention, in the method of treating the organic wastewater containing ammoniacal nitrogen by the biological nitrification denitrification method, a substance having a selective ion exchange capacity for ammonia is allowed to coexist in the activated sludge in the biological treatment tank, and the raw water is treated. Is supplied to the biological denitrification section, the slurry of the denitrification section is introduced to the nitrification section and the solid-liquid separation tank, and the activated sludge is subjected to solid-liquid separation, and part of the separated sludge is returned to the biological nitrification section to remove ammonia. A method for removing nitrogen, which is characterized by biologically regenerating a substance having a selective ion exchange capacity for adsorbed ammonia and anaerobically fermenting the other part of the precipitated sludge and then returning the same to a denitrification tank. It is a thing.
【０００５】[0005]
【発明の実施の形態】従来の生物学的脱窒素法は図１に
示すように処理水にアンモニアを残留させないことを基
本的考え方としているため硝化部からの流出スラリを沈
殿槽に導き硝酸性窒素を含む処理水を得ることを必須と
している。これに対し本発明は従来とは逆に、図２に示
すように脱窒素部から流出スラリを沈殿槽に導き、かつ
硝酸性窒素が生物学的脱窒素される脱窒素部にアンモニ
アに対する選択的イオン交換能を有する物質として、例
えば、粉末ゼオライトを共存させ脱窒素部に存在するア
ンモニアを選択的イオン交換吸着して除去し、アンモニ
アおよび硝酸性窒素の両者が高度に除去された処理水を
得ることを基本思想としている。なお図１の従来技術の
脱窒素部、もしくは硝化部にゼオライトを添加しても本
発明の効果はまったく得られず沈殿槽からは硝酸性窒素
が残留する処理水が流出してしまう。アンモニアに対す
る選択的イオン交換能を有する物質（例えば、ゼオライ
ト）の粒径は、生物処理槽内で曝気、攪拌で容易に流動
し、槽底に沈殿してしまわない小粒径（およそ５０ミク
ロン以下）が好適であり、粉末状のゼオライトを使用す
るのが好ましい。BEST MODE FOR CARRYING OUT THE INVENTION The conventional biological denitrification method is based on the basic idea that ammonia is not left in treated water as shown in FIG. It is essential to obtain treated water containing nitrogen. Contrary to the conventional method, the present invention, on the other hand, guides the effluent slurry from the denitrification section to the settling tank as shown in FIG. 2 and selects ammonia for the denitrification section where nitrate nitrogen is biologically denitrified. As a substance having an ion-exchange capacity, for example, coexistence of powdered zeolite is used to selectively remove the ammonia present in the denitrification section by ion-exchange adsorption to obtain treated water in which both ammonia and nitrate nitrogen are highly removed. That is the basic idea. Even if zeolite is added to the denitrification section or the nitrification section of the prior art shown in FIG. 1, the effect of the present invention is not obtained at all, and treated water in which nitrate nitrogen remains remains flows out from the precipitation tank. The particle size of a substance having a selective ion exchange capacity for ammonia (for example, zeolite) has a small particle size (about 50 microns or less that does not settle at the bottom of the tank because it easily flows by aeration and stirring in the biological treatment tank). ) Is preferred and it is preferred to use powdered zeolites.
【０００６】しかして図２の本発明の脱窒素部及び沈殿
槽から硝化槽に循環されるスラリには活性汚泥とアンモ
ニアに対する選択的イオン交換能を有する物質として、
例えば、ゼオライトが共存しているが、硝化部の好気的
雰囲気下で、ゼオライトに吸着されているアンモニアが
ゼオライト粒子の表面に付着している硝化菌によって生
物学的に硝化されて再生され再びアンモニア吸着能を持
つようになる。 図２において原水中のアンモニアの大
部分は生物学的に硝化脱窒素されるのでゼオライトによ
ってイオン交換除去すべきアンモニア濃度は大幅に減少
している。従ってアンモニアの吸着容量が少ないゼオラ
イトでも充分実用化できることを見いだした。なお、本
発明にいう「アンモニアに対する選択的イオン交換能を
有する物質」としては、ゼオライト、モルデナイト、ク
リノプチライト、合成ゼオライトなどのゼオライト系鉱
物であることが好ましい。Therefore, the slurry circulated from the denitrification section and the precipitation tank of the present invention of FIG. 2 to the nitrification tank is a substance having a selective ion exchange capacity for activated sludge and ammonia.
For example, although zeolite coexists, in the aerobic atmosphere of the nitrification section, the ammonia adsorbed on the zeolite is biologically nitrified and regenerated by the nitrifying bacteria adhering to the surface of the zeolite particles. It has the ability to adsorb ammonia. In FIG. 2, most of the ammonia in the raw water is biologically nitrified and denitrified, so that the concentration of ammonia to be ion-exchanged and removed by the zeolite is greatly reduced. Therefore, it was found that even zeolite having a small adsorption capacity for ammonia can be put to practical use. The "substance having a selective ion-exchange ability for ammonia" according to the present invention is preferably a zeolite-based mineral such as zeolite, mordenite, clinoptite or synthetic zeolite.
【０００７】図２を参照して本発明の作用を更に詳しく
説明する。下水などの汚水１は生物学的硝化部２から循
環される硝化スラリ３とともに生物学的脱窒素部４に供
給される。脱窒素部４には脱窒素菌を含む活性汚泥とア
ンモニアに対する選択的イオン交換能を有する物質とし
て、例えば、ゼオライト微粒子が共存して懸濁してい
る。その結果硝化スラリ３中の硝酸性窒素は汚水１のＢ
ＯＤを利用して生物学的に脱窒素され、汚水１中のアン
モニアはゼオライトに吸着されて除去される。硝化スラ
リ循環流量と返送汚泥流量の合計をＱ、汚水流入量を
ｑ、汚水中のアンモニア濃度をＣとすると脱窒素部４の
アンモニア濃度はおよそＣｑ／Ｑに減少しているので、
ゼオライトで吸着除去すべきアンモニア量は大きく減少
できる。The operation of the present invention will be described in more detail with reference to FIG. Sewage 1 such as sewage is supplied to a biological denitrification section 4 together with a nitrifying slurry 3 circulated from a biological nitrification section 2. In the denitrification section 4, for example, zeolite fine particles are coexisting and suspended as a substance having a selective ion exchange capacity for activated sludge containing denitrifying bacteria and ammonia. As a result, the nitrate nitrogen in the nitrification slurry 3 was changed to B in the wastewater 1.
The OD is used to biologically denitrify, and the ammonia in the wastewater 1 is adsorbed by the zeolite and removed. Assuming that the total flow rate of the nitrifying slurry circulation and the returned sludge flow rate is Q, the inflow amount of sewage is q, and the ammonia concentration in the sewage is C, the ammonia concentration in the denitrification section 4 is reduced to about Cq / Q.
The amount of ammonia to be adsorbed and removed by zeolite can be greatly reduced.
【０００８】ゼオライト共存活性汚泥の大部分は脱窒素
スラリ５として硝化部２に循環され、ここでアンモニア
を吸着したゼオライトが硝化菌によって生物学的に再生
される。（ゼオライト内部のアンモニアが硝化菌により
硝酸に酸化されゼオライトから脱着しゼオライトが再生
される） 脱窒素部４からの脱窒素スラリ５の残部６は沈殿槽７に
導かれゼオライト共存活性汚泥が沈殿分離され硝酸性窒
素、アンモニア性窒素の両者が高度に除去された処理水
８となる。分離汚泥９の大部分１０は硝化部２または脱
窒素部４に返送される。分離汚泥の残り１１の余剰汚泥
相当量の２〜４倍量を嫌気性発酵１１させて汚泥を生物
学的に可溶化し脱窒素槽に返送する。この可溶化汚泥は
活性汚泥によって炭酸ガス、水に分解される。この方法
によって系外に排出される余剰汚泥量はほとんど無くな
る。この結果余剰汚泥に混入して排出されるゼオライト
粒子量は無視少となり、新たなゼオライト添加量を極め
て少なくすることができる。また、本発明においては、
嫌気性微生物（酸生成菌、硫酸還元菌など）によって汚
泥が腐敗可溶化し汚泥から有機酸が生成し、微生物に資
化されやすい低分子有機物が生成するので、可溶化汚泥
を脱窒素槽に添加すると脱窒素菌のための有機炭素源効
果的に与えられ脱窒素反応が円滑に進む。Most of the zeolite coexisting activated sludge is circulated to the nitrification section 2 as a denitrification slurry 5, where the ammonia-adsorbed zeolite is biologically regenerated by nitrifying bacteria. (Ammonia inside the zeolite is oxidized to nitric acid by nitrifying bacteria and desorbed from the zeolite to regenerate the zeolite.) The remaining portion 6 of the denitrification slurry 5 from the denitrification section 4 is guided to the settling tank 7 to precipitate and separate the zeolite coexisting activated sludge. The treated water 8 is obtained by highly removing both nitrate nitrogen and ammonia nitrogen. Most of the separated sludge 9 is returned to the nitrification section 2 or the denitrification section 4. The sludge is biologically solubilized by anaerobic fermentation 11 with 2 to 4 times the amount of the excess sludge equivalent to the remaining 11 of the separated sludge, and the sludge is returned to the denitrification tank. The solubilized sludge is decomposed into carbon dioxide gas and water by the activated sludge. With this method, the amount of excess sludge discharged to the outside of the system is almost eliminated. As a result, the amount of zeolite particles mixed into the excess sludge and discharged becomes negligible, and the amount of new zeolite added can be made extremely small. In the present invention,
Anaerobic microorganisms (acid-producing bacteria, sulfate-reducing bacteria, etc.) rot-solubilize sludge and produce organic acids from sludge, which produces low-molecular organic substances that are easily assimilated by microorganisms. When added, the organic carbon source for the denitrifying bacteria is effectively provided and the denitrification reaction proceeds smoothly.
【０００９】さらに、ゼオライト微粒子を添加した活性
汚泥はゼオライトがおもりとなって沈降濃縮性が向上
し、硝化槽、脱窒素槽内の活性汚泥ＭＬＳＳを高濃度に
維持できるようになり、硝化、脱窒素速度が向上するほ
か汚泥令が長くなり、余剰汚泥発生量が減少する効果が
認められた。このほかの本発明の実施態様として次のよ
うな方法が挙げられる。 １．硝化部、または脱窒素部に粒状グルなどの微生物固
定化担体を共存させる方法。これにより、より効率的に
脱窒素処理、硝化処理が可能となる。 ２．脱窒素槽と沈殿槽の間に短時間の曝気槽を設け、脱
窒素槽でＢＯＤが少量残留する場合、残留ＢＯＤを除去
する方法。これにより、処理水のＢＯＤの悪化を確実に
防止することができる。Further, the activated sludge containing the zeolite fine particles has a weight of zeolite to improve the sedimentation / concentration property, and the activated sludge MLSS in the nitrification tank and the denitrification tank can be maintained at a high concentration. In addition to the improvement of nitrogen velocity, the sludge age became longer, and the effect of reducing the amount of excess sludge generated was recognized. Other embodiments of the present invention include the following methods. 1. A method in which a microorganism-immobilized carrier such as granular glue is allowed to coexist in the nitrification section or the denitrification section. This enables more efficient denitrification treatment and nitrification treatment. 2. A method in which a short-time aeration tank is provided between the denitrification tank and the precipitation tank, and when a small amount of BOD remains in the denitrification tank, residual BOD is removed. As a result, it is possible to reliably prevent deterioration of the BOD of the treated water.
【００１０】[0010]
【実施例】以下、実施例により本発明を更に具体的の説
明するが、本発明がこれらに限定されるものではない。
図２の工程に従って下水（平均水質を表１に示す）を対
象に本発明の実証試験を行なった。ゼオライトにはジ−
クライト工業（株）の製品である山形県板谷鉱山産出の
粉末ゼオライト（平均粒径５５ミクロン）を使用した。
試験条件を表２に示した。The present invention will be described in more detail with reference to the following examples, but the present invention is not limited thereto.
A verification test of the present invention was conducted on sewage (average water quality is shown in Table 1) according to the process of FIG. Zeolites are
Powder zeolite (average particle size: 55 microns) produced by Itaya Mine, Yamagata Prefecture, which is a product of Crite Industry Co., Ltd. was used.
The test conditions are shown in Table 2.
【００１１】表１ 水温 ２４度 ｐＨ ７．２ ＳＳ １３０ｍｇ／リットル ＢＯＤ １２０ｍｇ／リットル Ｔ−Ｎ ３７ｍｇ／リットル ＮＨ3 −Ｎ ２９ｍｇ／リットルTable 1 Water temperature 24 degrees pH 7.2 SS 130 mg / liter BOD 120 mg / liter T-N 37 mg / liter NH 3 -N 29 mg / liter
【００１２】 表２ 下水処理量 ２４リットル／ｄ 脱窒素部容積 ３リットル 硝化部容積 ４リットル 硝化部への脱窒素スラリ循環量 ７２リットル／ｄ ゼオライト共存活性汚泥ＭＬＳＳ濃度 ６０００ｍｇ／リットル 粉末ゼオライト懸濁濃度 ３０００ｍｇ／リットル 沈殿槽水面積負荷 ３５ｍｍ／ｍｉｎ ゼオライトメイクアップ量 ５０ｍｇ／リットル 嫌気性発酵槽容積 ０．８リットル 嫌気性発酵槽温度 ５０℃Table 2 Sewage treatment amount 24 liters / d Denitrification part volume 3 liters Nitrification part volume 4 liters Denitrification slurry circulation amount to the nitrification part 72 liters / d Zeolite coexisting activated sludge MLSS concentration 6000 mg / l Powder zeolite suspension concentration 3000 mg / liter sedimentation tank water surface load 35 mm / min Zeolite make-up amount 50 mg / liter Anaerobic fermentation tank volume 0.8 liter Anaerobic fermentation tank temperature 50 ° C
【００１３】実験の結果、処理が定常状態になってから
の沈殿槽からの表３の処理水水質のように高度に窒素が
除去されており、Ｔ−Ｎ除去率９０％以上が安定して得
られた。As a result of the experiment, nitrogen is highly removed like the treated water quality of Table 3 from the settling tank after the treatment has reached a steady state, and the TN removal rate of 90% or more is stable. Was obtained.
【００１４】表３ ＳＳ ５ｍｇ／リットル ＢＯＤ ４ｍｇ／リットル Ｔ−Ｎ ２．２ｍｇ／リットル ＮＨ3 −Ｎ ０．６ｍｇ／リットル ＮＯX −Ｎ ０．６５ｍｇ／リットル 運転開始後１年間に渡り、汚泥を余剰汚泥として系外に
排出する必要が無かった。Table 3 SS 5 mg / liter BOD 4 mg / liter T-N 2.2 mg / liter NH 3 -N 0.6 mg / liter NO X -N 0.65 mg / liter Surplus sludge for one year after the start of operation It was not necessary to discharge it as sludge outside the system.
【００１５】[0015]
【発明の効果】本発明の方法により、下記のような効果
が得られる。 １．生物学的硝化脱窒素技術とアンモニアに対する選択
的イオン交換能を有する物質（例えば、ゼオライト）に
よる選択的イオン交換反応を新規な態様で結合したので
処理水に硝酸性窒素が残留せず（従来法では第２脱窒素
槽を設けないと必ず硝酸性窒素が処理水中に残留す
る）、高度の窒素除去率が安定して得られる。 ２．アンモニアに対する選択的イオン交換能を有する物
質（例えば、ゼオライト）を生物学的に再生できる該物
質の再生薬液（食塩水など）は不要である。再生廃液の
処分も不要である。 ３．活性汚泥の沈降濃縮性が向上し、系内の活性汚泥濃
度を高く維持できる。 ４．嫌気性発酵による汚泥可溶化工程を組み込んだので
余剰汚泥がほとんど発生しない。 従って、本発明によれば、汚泥処理を著しく合理化する
ことができる。According to the method of the present invention, the following effects can be obtained. 1. Since the biological nitrification and denitrification technology and the selective ion exchange reaction by a substance having a selective ion exchange capacity for ammonia (for example, zeolite) are combined in a novel manner, nitrate nitrogen does not remain in the treated water (conventional method). However, nitrate nitrogen will always remain in the treated water unless a second denitrification tank is provided), and a high degree of nitrogen removal can be stably obtained. 2. It is not necessary to use a regenerant liquid (such as saline) capable of biologically regenerating a substance having a selective ion exchange ability with respect to ammonia (for example, zeolite). There is no need to dispose of recycled waste liquid. 3. The sedimentation concentration of activated sludge is improved, and the activated sludge concentration in the system can be maintained high. 4. Since the sludge solubilization process by anaerobic fermentation is incorporated, almost no excess sludge is generated. Therefore, according to the present invention, sludge treatment can be significantly streamlined.
【図１】従来の方法の工程図である。FIG. 1 is a process diagram of a conventional method.
【図２】本発明の方法の工程図である。FIG. 2 is a process drawing of the method of the present invention.
１ 原水 ２ 硝化槽 ３ 硝化スラリ ４ 脱窒素槽 ５ 脱窒素スラリ ６ 脱窒素スラリ５の残部 ７ 沈殿槽 ８ 処理水 ９ 分離汚泥 １０ 返送汚泥 １１ 嫌気性発酵 １２ ゼオライト微粒子 1 raw water 2 nitrification tank 3 nitrification slurry 4 denitrification tank 5 denitrification slurry 6 rest of denitrification slurry 5 settling tank 8 treated water 9 separated sludge 10 returned sludge 11 anaerobic fermentation 12 zeolite particles
Claims (1)
学的硝化脱窒素法で処理する方法において、アンモニア
に対する選択的イオン交換能を有する物質を生物処理槽
内の活性汚泥に共存せしめ、原水を生物学的脱窒素部に
供給し、該脱窒素部スラリを硝化部及び固液分離槽に導
き活性汚泥を固液分離し、分離汚泥の一部を生物学的硝
化部に返送しアンモニアを吸着したアンモニアに対する
選択的イオン交換能を有する物質を生物学的に再生する
とともに、沈殿汚泥の他部を嫌気性発酵せしめたのち脱
窒素槽に返送することを特徴とする有機性汚水の窒素除
去方法。1. A method for treating ammoniacal nitrogen-containing organic wastewater by a biological nitrification and denitrification method, wherein a substance having a selective ion exchange capacity for ammonia is allowed to coexist in activated sludge in a biological treatment tank to obtain raw water. It is supplied to the biological denitrification section, the slurry of the denitrification section is guided to the nitrification section and the solid-liquid separation tank, the activated sludge is separated into solid and liquid, and part of the separated sludge is returned to the biological nitrification section to adsorb ammonia. Method for removing nitrogen from organic wastewater, which comprises biologically regenerating a substance having a selective ion-exchange ability for ammonia, and anaerobically fermenting the other part of the precipitated sludge, and then returning it to a denitrification tank .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13516296A JPH09314184A (en) | 1996-05-29 | 1996-05-29 | Nitrogen removing process for organic sewage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13516296A JPH09314184A (en) | 1996-05-29 | 1996-05-29 | Nitrogen removing process for organic sewage |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09314184A true JPH09314184A (en) | 1997-12-09 |
Family
ID=15145281
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13516296A Pending JPH09314184A (en) | 1996-05-29 | 1996-05-29 | Nitrogen removing process for organic sewage |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09314184A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117923709A (en) * | 2024-01-24 | 2024-04-26 | 上海电力大学 | Efficient denitrification and N-type sewage treatment device2O recovery method and system |
-
1996
- 1996-05-29 JP JP13516296A patent/JPH09314184A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117923709A (en) * | 2024-01-24 | 2024-04-26 | 上海电力大学 | Efficient denitrification and N-type sewage treatment device2O recovery method and system |
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