JPS649078B2 - - Google Patents
Info
- Publication number
- JPS649078B2 JPS649078B2 JP3476881A JP3476881A JPS649078B2 JP S649078 B2 JPS649078 B2 JP S649078B2 JP 3476881 A JP3476881 A JP 3476881A JP 3476881 A JP3476881 A JP 3476881A JP S649078 B2 JPS649078 B2 JP S649078B2
- Authority
- JP
- Japan
- Prior art keywords
- denitrification
- tank
- water
- nitrogen
- treated 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.)
- Expired
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 31
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 25
- 238000011282 treatment Methods 0.000 claims description 21
- 238000005273 aeration Methods 0.000 claims description 15
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 10
- 229910052757 nitrogen Inorganic materials 0.000 claims description 10
- 239000010802 sludge Substances 0.000 claims description 8
- 229910001873 dinitrogen Inorganic materials 0.000 claims description 5
- 238000013019 agitation Methods 0.000 claims description 2
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 12
- 239000007789 gas Substances 0.000 description 9
- 241000894006 Bacteria Species 0.000 description 8
- 230000029058 respiratory gaseous exchange Effects 0.000 description 6
- 238000003756 stirring Methods 0.000 description 6
- 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 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 4
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 238000007796 conventional method Methods 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 239000000852 hydrogen donor Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000005416 organic matter Substances 0.000 description 2
- 238000012805 post-processing Methods 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 239000003513 alkali Substances 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000010800 human waste Substances 0.000 description 1
- 230000003834 intracellular effect Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000001546 nitrifying effect Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- -1 raw human waste Chemical compound 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 230000001954 sterilising effect Effects 0.000 description 1
- 238000004659 sterilization and disinfection Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Landscapes
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Description
〔産業上の利用分野〕
本発明は、アンモニア性窒素分及び活性汚泥を
含む処理水を第１脱窒槽とこれに続く硝化槽とか
ら成る循環曝気式窒素除去装置に供給して、循環
流動させながら硝化脱窒処理した後に第２脱窒槽
に供給し、処理水中の窒素分を窒素ガスとして除
去する脱窒用水処理方法に関するものである。な
お、この脱窒用水処理方法は、第１脱窒槽で遊離
されるアルカリを硝化槽で再利用できることや、
第１脱窒槽に添加すべき水素供与体として、処理
水中の有機物が利用できること等の点で優れた方
法であることが既に知られている。
〔従来の技術〕
上記の水処理方法における第２脱窒槽におい
て、従来では、槽を密閉して槽内を嫌気性状態に
保つとともに、スカムや沈澱物が生成して処理効
率が低下するとの問題は、槽内発生ガスを循環さ
せて処理水を撹拌し、脱窒素菌と処理水との接触
効率を高めることで解決している。また、従来で
は、脱窒素効率を向上させるためにメタノール等
の有機炭素源を第２脱窒槽内の処理水に添加して
いた。
〔発明が解決しようとする問題点〕
第２脱窒槽の完全な密閉が困難であるところか
ら、従来の方法では、前述の槽内ガスによる撹拌
に伴つて空気が処理水中に多量に混入して嫌気状
態が維持できず、完全嫌気条件下においてのみ脱
窒素機能が旺盛な脱窒素菌の内生呼吸（脱窒素菌
自身の細胞内物質を水素供与体として利用する反
応）による脱窒素作用が望めない。従つて、従来
では、脱窒効率向上のためにメタノール等の有機
炭素源を第２脱窒槽に添加していたのであるが、
この従来の方法では、メタノール等の添加に要す
る経済的負担が大きかつた。また、槽内ガスによ
る撹拌では、ガス中にCO2が含まれるため（脱窒
による有機物の分解にてCO2が発生する）、ガス
の循環に伴つて処理水のPHが低下し、脱窒素菌の
活性が低下する問題があつた。
本発明は、前記第２脱窒槽に有機炭素源を添加
することなしに脱窒素をおこなう、脱窒用水処理
方法を提供せんとするものである。
〔問題点を解決するための手段〕
上記問題を解決するために本発明が講じた技術
的手段は、前記第２脱窒槽内で非強制撹拌状態に
維持されている硝化処理水に対し、長時間間隔お
きに短時間の曝気処理を行うことである。
〔作 用〕
非強制撹拌状態を長時間維持することによつ
て、硝化処理水中への空気の混入が防がれ、嫌気
状態が維持される。嫌気条件下において、脱窒素
菌はその内生呼吸により処理水中の窒素分を窒素
ガスに還元処理する。また、長時間間隔おきにお
こなう短時間の曝気処理によつて、処理水の混合
とCO2ガスのストリツピングとがおこなわれる。
脱窒素菌の内生呼吸によつて、わずかにアンモニ
ア性窒素が液中に溶出するが、このアンモニア性
窒素は、曝気のために供給する酸素含有ガスによ
つて硝化処理を受ける。
〔発明の効果〕
本発明による技術的手段によれば、第２脱窒槽
を密閉する必要がなく、構造的に簡簡単になると
ともに、脱窒素菌の内生呼吸による脱窒素が可能
であるからメタノール等の有機炭素源の添加を必
要とせず、システム全体として経済的である。ま
た、スカムや沈澱物の生成を抑制したり、CO2を
ストリツピングすることによつて、脱窒素菌にと
つて好ましい生活環境を維持できる。しかも、脱
窒素菌の内生呼吸によれば、後述する実施例中で
も述べているように、除去硝酸性窒素分の約20％
相当のアンモニア性窒素が溶出して脱窒効率に限
界を生じるが、上記アンモニア性窒素を曝気のた
めの酸素含有ガスで硝化処理することにより、第
２脱窒槽における総窒素除去率を向上できる利点
がある。
〔実施例〕
次に本発明の実施例を説明する。
生し尿、浄化槽汚泥、あるいは、それらを混合
したもの等のアンモニア性窒素分を含む処理水
を、第１脱窒槽１と硝化槽２から成る循環曝気式
窒素除去装置３に供給し、処理水を第１脱窒槽１
と硝化槽２とにわたつて循環流動させ、処理水中
のアンモニア性窒素分を硝化処理すると共に、硝
化されたあるいは処理水中に混入していた硝酸性
窒素分の一部を活性汚泥により還元脱窒処理す
る。
前記窒素除去装置３からの硝化処理水を第２脱
窒槽４に供給し、強制的に撹拌することの無い状
態を維持しながらも、酸素含有ガス供給装置５を
通じて、例えば、２時間おきに10分間曝気処理す
る等、長時間間隔おきに短時間の曝気処理を行わ
せて12時間以上滞留し、硝酸性窒素分を還元処理
し、窒素ガスとして除去する。
しかる後、処理水を再曝気槽６に供給し、空気
の供給により活性汚泥に付着した窒素ガスを分離
した後、沈澱槽７に供給して汚泥を沈降分離し、
分離液は殺菌等の後処理装置８に供給して処理し
た後に放流し、他方、汚泥は、一部を脱水、乾
燥、焼却等の後処理装置９に供給して処理し、大
部分を第１脱窒槽１に返送する。
次に、本発明案出の基となつた実験結果につい
て説明する。
嫌気条件下での第２脱窒槽４における除去硝酸
性窒素分（NOx−Ｎ）濃度及び溶出アンモニア
性窒素分（NH4−Ｎ）濃度夫々について測定し
たところ第２図のググフで示す結果を得た。
即ち、除去硝酸性窒素分の約20％程度のアンモ
ニア性窒素分が、嫌気性汚泥の内性呼吸に起因し
て分解生成されることがわかり、上述曝気処理に
よつてこれら分解生成されたアンモニア性窒素分
を硝化処理するのである。
又、曝気処理時間と脱窒濃度との相関について
測定してみたところ、MLSSを15000ppmとして
次表に示す結果を得た。
[Industrial Application Field] The present invention supplies treated water containing ammonia nitrogen and activated sludge to a circulating aeration type nitrogen removal device consisting of a first denitrification tank and a nitrification tank following it, and causes the water to circulate and flow. The present invention relates to a denitrification water treatment method in which the water is supplied to a second denitrification tank after being subjected to nitrification and denitrification treatment, and the nitrogen content in the treated water is removed as nitrogen gas. In addition, this denitrification water treatment method has the following advantages: alkali liberated in the first denitrification tank can be reused in the nitrification tank;
It is already known that this method is excellent in that organic matter in the treated water can be used as a hydrogen donor to be added to the first denitrification tank. [Prior Art] Conventionally, in the second denitrification tank in the water treatment method described above, the tank is sealed to maintain the tank interior in an anaerobic state, and scum and sediment are generated, reducing treatment efficiency. This problem is solved by circulating the gas generated in the tank and stirring the treated water to increase the efficiency of contact between the denitrifying bacteria and the treated water. Furthermore, conventionally, an organic carbon source such as methanol has been added to the treated water in the second denitrification tank in order to improve denitrification efficiency. [Problems to be Solved by the Invention] Since it is difficult to completely seal the second denitrification tank, in the conventional method, a large amount of air gets mixed into the treated water due to the agitation by the gas in the tank. The denitrifying effect is expected to occur through endogenous respiration (a reaction in which the denitrifying bacteria's own intracellular substances are used as hydrogen donors), which cannot maintain an anaerobic state and is only active in denitrifying functions under completely anaerobic conditions. do not have. Therefore, in the past, organic carbon sources such as methanol were added to the second denitrification tank to improve denitrification efficiency.
In this conventional method, the economical burden required for adding methanol etc. was large. In addition, when stirring with gas in the tank, the gas contains CO 2 (CO 2 is generated by the decomposition of organic matter through denitrification), so as the gas circulates, the PH of the treated water decreases, resulting in denitrification. There was a problem that the activity of bacteria decreased. The present invention aims to provide a denitrification water treatment method that performs denitrification without adding an organic carbon source to the second denitrification tank. [Means for Solving the Problems] The technical means taken by the present invention to solve the above problems is that the nitrified water, which is maintained in a non-forced stirring state in the second denitrification tank, is This means performing short aeration treatment at time intervals. [Function] By maintaining the non-forced stirring state for a long time, air is prevented from entering the nitrified water and an anaerobic state is maintained. Under anaerobic conditions, denitrifying bacteria reduce nitrogen in the treated water to nitrogen gas through endogenous respiration. In addition, mixing of treated water and stripping of CO 2 gas are performed by short-time aeration treatments performed at long intervals.
Due to the endogenous respiration of denitrifying bacteria, a small amount of ammonia nitrogen is eluted into the liquid, but this ammonia nitrogen is nitrified by the oxygen-containing gas supplied for aeration. [Effects of the Invention] According to the technical means of the present invention, there is no need to seal the second denitrification tank, and the structure is simple and denitrification is possible through endogenous respiration of denitrifying bacteria. It does not require the addition of organic carbon sources such as methanol, and the system as a whole is economical. In addition, by suppressing the formation of scum and precipitates and stripping CO 2 , a favorable living environment for denitrifying bacteria can be maintained. Furthermore, according to the endogenous respiration of denitrifying bacteria, approximately 20% of the nitrate nitrogen removed is
Although a considerable amount of ammonia nitrogen is eluted, which limits the denitrification efficiency, the advantage is that the total nitrogen removal rate in the second denitrification tank can be improved by nitrifying the ammonia nitrogen with oxygen-containing gas for aeration. There is. [Example] Next, an example of the present invention will be described. Treated water containing ammonia nitrogen, such as raw human waste, septic tank sludge, or a mixture thereof, is supplied to a circulating aeration type nitrogen removal device 3 consisting of a first denitrification tank 1 and a nitrification tank 2, and the treated water is First denitrification tank 1
and nitrification tank 2 to nitrify the ammonia nitrogen content in the treated water, and reduce and denitrify a part of the nitrate nitrogen content that has been nitrified or mixed in the treated water using activated sludge. Process. The nitrified water from the nitrogen removal device 3 is supplied to the second denitrification tank 4, and while maintaining a state without forcible stirring, it is fed through the oxygen-containing gas supply device 5, for example, every 2 hours for 10 minutes. Short-time aeration treatment is performed at long intervals, such as aeration treatment for 1 minute, and the mixture is retained for 12 hours or more to reduce nitrate nitrogen and remove it as nitrogen gas. After that, the treated water is supplied to the reaeration tank 6, and after separating the nitrogen gas adhering to the activated sludge by supplying air, it is supplied to the settling tank 7, where the sludge is sedimented and separated.
The separated liquid is supplied to a post-processing device 8 such as sterilization, treated, and then released.On the other hand, a part of the sludge is supplied to a post-processing device 9, such as dehydration, drying, incineration, etc., for treatment, and most of it is 1 Return to denitrification tank 1. Next, the experimental results that are the basis for devising the present invention will be explained. When the removed nitrate nitrogen (NOx-N) concentration and the eluted ammonia nitrogen ( NH4 -N) concentration were measured in the second denitrification tank 4 under anaerobic conditions, the results shown in the graphs in Figure 2 were obtained. Ta. In other words, it was found that about 20% of the ammonia nitrogen content of the removed nitrate nitrogen content was decomposed and produced due to endogenous respiration of the anaerobic sludge, and that the ammonia produced by decomposition by the above-mentioned aeration treatment The nitrogen content is nitrified. We also measured the correlation between the aeration treatment time and the denitrification concentration, and obtained the results shown in the following table with an MLSS of 15,000 ppm.
【表】
ここで、脱窒槽４の混合液濃度は、非強制撹拌
状態に維持されるため、薄いと沈澱分離するため
脱窒効率が低下する。その為、MLSS濃度は最低
5000ppm以上は必要であり、好ましくは
10000ppm以上が必要である。
即ち、時間間隔を長くする程脱窒濃度が大にな
ることが明らかである。しかし、時間間隔を長く
すればする程、スカムや沈澱物の生成量が増加す
るものであり、それらの相対関係から、本発明を
実施するに２時間おきに10分間の曝気処理を行う
ことが、好適な結果を得る上で望ましいことがわ
かつた。[Table] Here, since the concentration of the mixed liquid in the denitrification tank 4 is maintained in a non-forced stirring state, if it is too thin, precipitation will occur and the denitrification efficiency will decrease. Therefore, the MLSS concentration is the lowest
5000ppm or more is necessary, preferably
10000ppm or more is required. That is, it is clear that the longer the time interval, the higher the denitrification concentration. However, as the time interval becomes longer, the amount of scum and precipitates produced increases, and from the relative relationship between them, it is recommended to carry out aeration treatment for 10 minutes every two hours when implementing the present invention. , was found to be desirable in obtaining favorable results.
図面は本発明に係る脱窒用水処理方法の実施例
を示し、第１図はフローシート、第２図はグラフ
である。
１……第１脱窒槽、２……硝化槽、３……循環
曝気式窒素除去装置、４……第２脱窒槽。
The drawings show an embodiment of the denitrification water treatment method according to the present invention, with FIG. 1 being a flow sheet and FIG. 2 being a graph. 1... First denitrification tank, 2... Nitrification tank, 3... Circulating aeration type nitrogen removal device, 4... Second denitrification tank.
Claims (1)
水を第１脱窒槽１とこれに続く硝化槽２とから成
る循環曝気式窒素除去装置３に供給して、循環流
動させながら硝化脱窒処理した後に第２脱窒槽４
に供給し、処理水中の窒素分を窒素ガスとして除
去する脱窒用水処理方法において、前記第２脱窒
槽４内で非強制撹拌状態に維持されている硝化処
理水に対し、長時間間隔おきに短時間の曝気処理
を行うことを特徴とする脱窒用水処理方法。 ２ 前記第２脱窒槽４において、２時間おきに10
分間の曝気処理を行うことを特徴とする特許請求
の範囲第１項に記載の脱窒用水処理方法。[Claims] 1. Treated water containing ammonia nitrogen and activated sludge is supplied to a circulating aeration type nitrogen removal device 3 consisting of a first denitrification tank 1 and a nitrification tank 2 following it, while circulating and flowing it. After nitrification and denitrification treatment, the second denitrification tank 4
In the denitrification water treatment method in which the nitrogen content in the treated water is removed as nitrogen gas, the nitrified water that is maintained in a non-forced agitation state in the second denitrification tank 4 is fed at long intervals. A water treatment method for denitrification characterized by performing aeration treatment for a short time. 2 In the second denitrification tank 4, 10
2. The denitrification water treatment method according to claim 1, wherein the aeration treatment is performed for 1 minute.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3476881A JPS57150495A (en) | 1981-03-10 | 1981-03-10 | Treatment of water for denitrification |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3476881A JPS57150495A (en) | 1981-03-10 | 1981-03-10 | Treatment of water for denitrification |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57150495A JPS57150495A (en) | 1982-09-17 |
| JPS649078B2 true JPS649078B2 (en) | 1989-02-16 |
Family
ID=12423479
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3476881A Granted JPS57150495A (en) | 1981-03-10 | 1981-03-10 | Treatment of water for denitrification |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57150495A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11330944B2 (en) | 2009-03-13 | 2022-05-17 | Omachron Intellectual Property Inc. | Portable surface cleaning apparatus |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4409435C2 (en) * | 1994-03-19 | 1995-06-14 | Ott Peter | Process for the simultaneous biological removal of phosphorus and nitrogen from waste water |
-
1981
- 1981-03-10 JP JP3476881A patent/JPS57150495A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11330944B2 (en) | 2009-03-13 | 2022-05-17 | Omachron Intellectual Property Inc. | Portable surface cleaning apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57150495A (en) | 1982-09-17 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP2003126887A (en) | Method and device for treating water containing phosphorus and ammonia | |
| JP2970730B2 (en) | Sewage treatment method | |
| JPS6254075B2 (en) | ||
| JPS6117558B2 (en) | ||
| JPS649078B2 (en) | ||
| JP4085436B2 (en) | Drainage treatment apparatus and method | |
| JP3769772B2 (en) | Method for treating selenium-containing water | |
| JP3944981B2 (en) | Method for treating selenium and nitrogen-containing water | |
| JP3837757B2 (en) | Method for treating selenium-containing water | |
| JPH08141552A (en) | Method for treating nitrogen in wastewater | |
| JPS6222678B2 (en) | ||
| JPH03275196A (en) | Nitrous acid type nitrifying and denitrifying treatment device | |
| JPS6052880B2 (en) | Biological denitrification and dephosphorization equipment for wastewater | |
| JPH01215400A (en) | Biological denitrifying and dephosphorizing method for waste water | |
| JPS61197097A (en) | Method for denitrifying waste water | |
| JP2002273476A (en) | Treatment of waste water containing high-concentration nitrogen | |
| JPH05154495A (en) | Method for nitrifying and denitrifying organic waste water | |
| JPS586558B2 (en) | Sewage treatment method | |
| JPH03229693A (en) | Treatment of organic waste water | |
| JPH08141596A (en) | Nitrogen treatment method for waste water containing ammonia nitrogen and oxide nitrogen | |
| JPS5939199B2 (en) | Biological denitrification method of wastewater | |
| JPS61230793A (en) | Biological treatment of waste water | |
| JPS6331224B2 (en) | ||
| JPH0218155B2 (en) | ||
| JPH0679714B2 (en) | Organic wastewater treatment method |