JP5292658B2 - A method for nitrification of ammonia nitrogen-containing water - Google Patents
A method for nitrification of ammonia nitrogen-containing water Download PDFInfo
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Abstract
Description
【発明の属する技術分野】
本発明は、アンモニア性窒素含有水をアンモニア酸化細菌の存在下に曝気して硝化する方法に係り、特に、この硝化処理における曝気風量を的確に制御して硝化槽内の溶存酸素（ＤＯ）濃度を低く保ち、亜硝酸型硝化を行うアンモニア性窒素含有水の硝化方法に関する。
BACKGROUND OF THE INVENTION
The present invention relates to a method for aeration by nitrifying ammonia nitrogen-containing water in the presence of ammonia-oxidizing bacteria. In particular, the concentration of dissolved oxygen (DO) in the nitrification tank is controlled by accurately controlling the amount of aeration air in this nitrification treatment. The present invention relates to a nitrification method for ammonia-containing water containing nitrite-type nitrification.
【従来の技術】
排液中に含まれるアンモニア性窒素は河川、湖沼及び海洋などにおける富栄養化の原因物質の一つであり、排液処理工程で効率的に除去する必要がある。一般に、排水中のアンモニア性窒素は、アンモニア性窒素をアンモニア酸化細菌により亜硝酸性窒素に酸化し、更にこの亜硝酸性窒素を亜硝酸酸化細菌により硝酸性窒素に酸化する硝化工程と、これらの亜硝酸性窒素及び硝酸性窒素を従属栄養性細菌である脱窒菌により、有機物を電子供与体として利用して窒素ガスにまで分解する脱窒工程との２段階の生物反応を経て窒素ガスにまで分解される。
[Prior art]
Ammonia nitrogen contained in the effluent is one of the causative substances of eutrophication in rivers, lakes and oceans, and it is necessary to remove it efficiently in the effluent treatment process. In general, ammonia nitrogen in wastewater is oxidized by ammonia oxidizing bacteria to nitrite nitrogen, and nitrifying nitrogen is oxidized to nitrate nitrogen by nitrite oxidizing bacteria. Nitrite nitrogen and nitrate nitrogen are denitrified bacteria, which are heterotrophic bacteria, and are converted into nitrogen gas through a two-stage biological reaction with a denitrification process that decomposes organic matter into nitrogen gas using an electron donor. Disassembled.
しかし、このような従来の硝化脱窒法では、脱窒工程において電子供与体としてメタノールなどの有機物を多量に必要とし、また硝化工程では多量の酸素が必要であるため、ランニングコストが高いという欠点がある。
However, such a conventional nitrification denitrification method requires a large amount of organic matter such as methanol as an electron donor in the denitrification step, and also requires a large amount of oxygen in the nitrification step, so that the running cost is high. is there.
これに対して、近年、アンモニア性窒素を電子供与体とし、亜硝酸性窒素を電子受容体とする独立栄養性微生物（以下「ＡＮＡＭＭＯＸ菌」と称す場合がある。）を利用し、アンモニア性窒素と亜硝酸性窒素とを反応させて脱窒する方法が提案された。この方法であれば、有機物の添加は不要であるため、従属栄養性の脱窒菌を利用する方法と比べて、コストを低減することができる。また、独立栄養性の微生物は収率が低く、汚泥の発生量が従属栄養性微生物と比較すると著しく少ないので、余剰汚泥の発生量を抑えることができる。更に、従来の硝化脱窒法で観察されるＮ２Ｏの発生がなく、環境に対する負荷を低減できるといった特長もある。
On the other hand, in recent years, by using an autotrophic microorganism (hereinafter sometimes referred to as “ANAMMOX bacteria”) having ammonia nitrogen as an electron donor and nitrite nitrogen as an electron acceptor, ammonia nitrogen is used. A method of denitrification by reacting nitrous acid with nitrite nitrogen was proposed. If this method is used, it is not necessary to add an organic substance, so that the cost can be reduced as compared with a method using heterotrophic denitrifying bacteria. Moreover, since the yield of autotrophic microorganisms is low and the amount of sludge generated is significantly less than that of heterotrophic microorganisms, the amount of surplus sludge generated can be suppressed. Furthermore, there is also a feature that there is no generation of N 2 O observed by the conventional nitrification denitrification method, and the burden on the environment can be reduced.
このＡＮＡＭＭＯＸ菌を利用する生物脱窒プロセスは、Strous, M, et al., Appl. Microbiol. Biotecnol., 50, p.589-596 (1998) に報告されており、以下のような反応でアンモニア性窒素と亜硝酸性窒素が反応して窒素ガスに分解されると考えられている。
This biological denitrification process using ANAMOX bacteria has been reported in Strous, M, et al., Appl. Microbiol. Biotecnol., 50, p.589-596 (1998). It is believed that reactive nitrogen and nitrite nitrogen react and decompose into nitrogen gas.
【化１】
このＡＮＡＭＭＯＸ菌を利用する生物脱窒方法において処理対象となる原水は、アンモニア性窒素及び亜硝酸性窒素を含む水である。この原水はアンモニア性窒素を含む液と亜硝酸性窒素を含む液を混合したものであってもよい。例えば、アンモニア性窒素を含む排水をアンモニア酸化細菌の存在下に曝気して好気性処理を行い、アンモニア性窒素の一部、好ましくはその１／２を亜硝酸に部分酸化したものを原水とすることができる。更には、アンモニア性窒素を含む排水の一部をアンモニア酸化細菌の存在下に曝気して好気性処理を行い、アンモニア性窒素を亜硝酸に酸化し、アンモニア性窒素を含む排水の残部と混合したものを原水としても良い。
In the biological denitrification method using the ANAMOX bacteria, raw water to be treated is water containing ammonia nitrogen and nitrite nitrogen. This raw water may be a mixture of a liquid containing ammonia nitrogen and a liquid containing nitrite nitrogen. For example, a waste water containing ammonia nitrogen is aerated in the presence of ammonia oxidizing bacteria and subjected to aerobic treatment, and a part of ammonia nitrogen, preferably 1/2 of which is partially oxidized to nitrous acid, is used as raw water. be able to. In addition, a portion of the wastewater containing ammonia nitrogen was aerated in the presence of ammonia-oxidizing bacteria for aerobic treatment, oxidizing the ammonia nitrogen to nitrous acid and mixing it with the remainder of the waste water containing ammonia nitrogen. Goods can be used as raw water.
従って、ＡＮＡＭＭＯＸ菌を利用した生物脱窒処理を行うためには、排水中のアンモニア性窒素をアンモニア酸化細菌により処理するにあたり、硝酸にまで酸化することなく、酸化を亜硝酸で止める亜硝酸型硝化を行う必要がある。
Therefore, in order to perform biological denitrification treatment using ANAMMOX bacteria, nitrite type nitrification that stops oxidation with nitrous acid without oxidizing it to nitric acid when treating ammonia nitrogen in wastewater with ammonia oxidizing bacteria Need to do.
一般に、アンモニア性窒素の硝化反応は、ＤＯ濃度を低く制御することにより亜硝酸型となり、亜硝酸を蓄積させることができることが知られている。すなわち、アンモニア性窒素を亜硝酸性窒素にするに必要な量だけの酸素を供給し、亜硝酸性窒素から硝酸性窒素への酸化反応を抑制することにより亜硝酸型硝化を行うものである。この場合には、例えばＤＯセンサにより反応槽内のＤＯ濃度を計測しつつ、この値に基いて曝気風量を制御すれば良い。
In general, it is known that the nitrification reaction of ammoniacal nitrogen becomes a nitrite type by controlling the DO concentration to be low, and nitrite can be accumulated. That is, nitrite-type nitrification is performed by supplying only the amount of oxygen necessary to turn ammonia nitrogen into nitrite nitrogen and suppressing the oxidation reaction from nitrite nitrogen to nitrate nitrogen. In this case, for example, the aeration air volume may be controlled based on this value while measuring the DO concentration in the reaction tank using the DO sensor.
【発明が解決しようとする課題】
しかし、容積の小さな実験装置では、ＤＯ濃度の正確な制御が可能であり、亜硝酸型硝化を実現することができるが、実際の水処理装置では曝気が行われている反応槽内においてＤＯ濃度に分布が生じ、一方でＤＯセンサは一般に精密な連続計測が困難である。このため実装置におけるＤＯ濃度の制御では、反応槽内のＤＯ濃度を長期にわたり、例えば０．１ｍｇ／Ｌ単位で低濃度にむらなく制御して、亜硝酸型硝化を確実に行うことはできず、過剰曝気により亜硝酸の一部が硝酸にまで酸化されてしまう。
[Problems to be solved by the invention]
However, in an experimental apparatus with a small volume, the DO concentration can be accurately controlled, and nitrite type nitrification can be realized. However, in an actual water treatment apparatus, the DO concentration is in a reaction vessel where aeration is performed. On the other hand, the DO sensor is generally difficult to perform precise continuous measurement. For this reason, in the control of the DO concentration in the actual apparatus, the DO concentration in the reaction tank cannot be controlled uniformly over a long period of time, for example, in units of 0.1 mg / L, and the nitrite type nitrification cannot be reliably performed. In addition, a part of nitrous acid is oxidized to nitric acid by excessive aeration.
本発明は上記従来の問題点を解決し、アンモニア性窒素含有水をアンモニア酸化細菌の存在下に曝気して硝化するにあたり、曝気風量を的確に制御して硝化槽内のＤＯ濃度を低く保ち、長期にわたり安定な亜硝酸型硝化を行うアンモニア性窒素含有水の硝化方法を提供することを目的とする。
The present invention solves the above-mentioned conventional problems, and aeration of ammoniacal nitrogen-containing water in the presence of ammonia-oxidizing bacteria to nitrify, the aeration air volume is accurately controlled to keep the DO concentration in the nitrification tank low, It is an object of the present invention to provide a nitrification method of ammonia nitrogen-containing water that performs stable nitrite type nitrification over a long period of time.
【課題を解決するための手段】
本発明のアンモニア性窒素含有水の硝化方法は、アンモニア性窒素含有水をアンモニア酸化細菌の存在下に曝気して硝化する硝化槽に導入して硝化する方法であって、該硝化槽の曝気風量を調節して硝化を制御するアンモニア性窒素含有水の硝化方法において、該硝化槽内の液ｐＨは５〜９、亜硝酸イオン濃度が５０〜１００００ｍｇ−Ｎ／Ｌ、温度が１０〜４０℃、窒素負荷が０．１〜３ｋｇ−Ｎ／ｍ ３ ・ｄａｙであり、該硝化槽内の硝化液又は硝化槽から流出する硝化液中のアンモニア性窒素濃度を測定し、この測定値に基いて、該硝化槽内の硝化液又は硝化槽から流出する硝化液中のアンモニア性窒素濃度が２０〜１００ｍｇ／Ｌとなるように曝気風量を調節して亜硝酸型硝化を行うことを特徴とする。
[Means for Solving the Problems]
The nitrification method of ammonia nitrogen-containing water of the present invention is a method of nitrifying by introducing ammonia nitrogen-containing water into a nitrification tank that aerates and nitrifies in the presence of ammonia-oxidizing bacteria, and the aeration air volume of the nitrification tank In the nitrification method of ammonia nitrogen-containing water that controls nitrification by adjusting the pH, the liquid pH in the nitrification tank is 5-9, the nitrite ion concentration is 50-10000 mg-N / L, the temperature is 10-40 ° C., The nitrogen load is 0.1 to 3 kg-N / m 3 · day, the ammonia nitrogen concentration in the nitrification liquid in the nitrification tank or the nitrification liquid flowing out of the nitrification tank is measured, and based on this measurement value, The nitrite type nitrification is performed by adjusting the amount of aeration air so that the ammoniacal nitrogen concentration in the nitrification liquid in the nitrification tank or the nitrification liquid flowing out of the nitrification tank is 20 to 100 mg / L.
本発明によれば、硝化槽内又は硝化槽から流出する硝化槽中に残留するアンモニア性窒素濃度に基いて、この残留アンモニア性窒素濃度が２０〜１００ｍｇ／Ｌとなるように曝気風量を調節することにより、亜硝酸型硝化を安定かつ確実に行うことができる。
According to the present invention, based on the ammonium nitrogen concentration remaining in nitrification tank flowing out from the nitrification tank or the nitrification tank, aeration amount as residual concentration of ammonium nitrogen this is 20 to 100 mg / L By adjusting the nitrite, nitrite type nitrification can be performed stably and reliably.
【発明の実施の形態】
以下に図面を参照して本発明の実施の形態を詳細に説明する。
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
図１は本発明のアンモニア性窒素含有水の硝化方法の実施の形態を示す系統図である。
FIG. 1 is a system diagram showing an embodiment of the nitrification method for ammonia nitrogen-containing water according to the present invention.
図１（ａ），（ｂ）において、１は硝化槽（曝気槽）でありブロワ３から供給される空気を曝気する散気管２が設けられている。
1A and 1B, reference numeral 1 denotes a nitrification tank (aeration tank), which is provided with an air diffuser 2 for aeration of air supplied from a
図１（ａ）では、硝化槽１の処理水が導入される処理水槽４にＮＨ４−Ｎ濃度測定装置５が設けられ、図１（ｂ）では、硝化槽１にＮＨ４−Ｎ濃度測定装置５が設けられている。いずれの場合も、ＮＨ４−Ｎ濃度測定装置５の測定結果に基いて、ブロワ３の曝気風量が制御されるように構成されている。
In FIG. 1A, an NH 4 -N concentration measuring device 5 is provided in a treated water tank 4 into which treated water in the nitrification tank 1 is introduced, and in FIG. 1B, an NH 4 -N concentration measurement is performed in the nitrifying tank 1. A device 5 is provided. In either case, the aeration air volume of the
このＮＨ４−Ｎ濃度測定装置５としては、隔膜型イオン電極等を用いることができる。
As the NH 4 —N concentration measuring device 5, a diaphragm ion electrode or the like can be used.
本発明においては、図１（ａ）に示す如く、硝化槽１の処理水のＮＨ４−Ｎ濃度の測定結果、又は、図１（ｂ）に示す如く、硝化槽１中の硝化液のＮＨ４−Ｎ濃度の測定結果に基いて、硝化槽１の曝気風量を調節する。
In the present invention, as shown in FIG. 1A, the measurement result of the NH 4 -N concentration of the treated water in the nitrification tank 1, or the NH of the nitrification liquid in the nitrification tank 1 as shown in FIG. The amount of aeration air in the nitrification tank 1 is adjusted based on the measurement result of the 4- N concentration.
この曝気風量の調節は、硝化を亜硝酸性窒素で止め、硝酸性窒素の生成を抑えて亜硝酸型硝化を行うために、ＮＨ４−Ｎ濃度の測定値が２０ｍｇ／Ｌ以上となるように曝気風量を調節する。ＮＨ４−Ｎ濃度の測定値が２０ｍｇ／Ｌ未満であると硝酸性窒素が生成するようになり、亜硝酸型硝化を行えなくなる。
Regulation of the aeration amount is stopped nitrifying with nitrite nitrogen, in order to perform the nitrite type nitrification suppressing the production of nitrate nitrogen, such that the measurement of NH 4 -N concentration of 20 mg / L or more adjust the aeration air quantity to. When the measured value of the NH 4 -N concentration is less than 20 mg / L, nitrate nitrogen is generated, and nitrite type nitrification cannot be performed .
亜硝酸型硝化を行って、原水中のアンモニア性窒素を高い転換率で亜硝酸性窒素に酸化する場合、硝化槽中の硝化液又は処理水中のＮＨ４−Ｎ濃度が２０〜１００ｍｇ／Ｌ、特に２０〜５０ｍｇ／Ｌとなるように曝気風量を調節する。
Performing nitrite type nitrification, raw water ammonia nitrogen high conversion rate in situ oxidized to nitrite nitrogen if, nitrification liquid or processing NH 4 -N concentration in water in the
このようにして得られる亜硝酸性窒素濃度の高い処理水は、所定の割合でアンモニア性窒素を含有する排水と混合して、前述のＡＮＡＭＭＯＸ菌による生物脱窒処理の原水とすることができる。
The treated water having a high concentration of nitrite nitrogen obtained in this manner can be mixed with wastewater containing ammonia nitrogen at a predetermined ratio to be used as the raw water for the biological denitrification treatment by the above-mentioned ANAMMOX bacteria.
また、原水中のアンモニア性窒素をある程度残留させて、そのまま前述のＡＮＡＭＭＯＸ菌による生物脱窒処理の原水とすることができるような処理水を得る場合には、硝化槽中の硝化液又は処理水中のＮＨ４−Ｎ濃度が２０ｍｇ／Ｌ以上であって、原水のＮＨ４−Ｎ濃度の約１／２程度となるように曝気風量を調整すれば良い。
In addition, when obtaining treated water that leaves ammonia nitrogen in the raw water to some extent and can be used as it is as the raw water for the biological denitrification treatment by the above-mentioned ANAMMOX bacteria, the nitrification solution or the treated water in the nitrification tank is obtained. a is NH 4 -N concentration of 20 mg / L or more, may be adjusted aeration amount to approximately about 1/2 of NH 4 -N concentration of the raw water.
なお、本発明において、硝化槽の形式には特に制限はなく、汚泥懸濁式、固定床、流動床、グラニュール法、スポンジなどの担体添加法など、いずれの形式のものも採用することができる。
In the present invention, the type of the nitrification tank is not particularly limited, and any type such as a sludge suspension type, a fixed bed, a fluidized bed, a granule method, and a carrier addition method such as a sponge may be adopted. it can.
本発明においては、アンモニア性窒素濃度に基く曝気風量の調節で、亜硝酸型硝化を安定かつ確実に行うことができるため、硝化処理条件としては、亜硝酸型硝化のための厳密な制限を行う必要はないが、好ましくは、アンモニア酸化細菌の活性を高く維持し、かつ亜硝酸酸化細菌の活性が低くなるように、硝化槽内の液ｐＨは５〜９、好ましくは７〜８、亜硝酸イオン濃度が５０〜１００００ｍｇ−Ｎ／Ｌ、好ましくは２００〜３０００ｍｇ−Ｎ／Ｌ、温度が１０〜４０℃、好ましくは２０〜３５℃、窒素負荷が０．１〜３ｋｇ−Ｎ／ｍ３・ｄａｙ、好ましくは０．２〜１ｋｇ−Ｎ／ｍ３・ｄａｙになるように制御する。 In the present invention, nitrite type nitrification can be performed stably and reliably by adjusting the amount of aeration air based on the ammoniacal nitrogen concentration. Therefore, the nitrification treatment conditions are strictly limited for nitrite type nitrification. Although it is not necessary, the liquid pH in the nitrification tank is preferably 5 to 9, preferably 7 to 8, so that the activity of ammonia oxidizing bacteria is kept high and the activity of nitrite oxidizing bacteria is low. The ion concentration is 50 to 10,000 mg-N / L, preferably 200 to 3000 mg-N / L, the temperature is 10 to 40 ° C., preferably 20 to 35 ° C., and the nitrogen load is 0.1 to 3 kg-N / m 3 · day. preferably that controls so as to 0.2~1kg-N / m 3 · day .
【実施例】
以下に実験例及び実施例を挙げて本発明をより具体的に説明する。
【Example】
Hereinafter, the present invention will be described in more detail with reference to experimental examples and examples.
実験例１
容積５Ｌの曝気槽に、下水汚泥由来の活性汚泥を投入し、嫌気性硝化槽の脱離液（濃度約５００ｍｇ−Ｎ／Ｌ）を５倍希釈したもの（ｐＨ８．０，温度３０℃）を原水として供給した。このときの窒素負荷は０．７〜１．３ｋｇ−Ｎ／ｍ３・ｄａｙである。
Experimental example 1
Activated sludge derived from sewage sludge into an aeration tank with a volume of 5 L and a 5-fold dilution of anaerobic nitrification tank desorption liquid (concentration of about 500 mg-N / L) (pH 8.0,
処理開始後、曝気槽内液中にＤＯが十分に存在する場合には、硝化反応は硝酸まですすみ、亜硝酸の蓄積は起こらなかった。
When DO was sufficiently present in the liquid in the aeration tank after the start of the treatment, the nitrification reaction was completed with nitric acid, and accumulation of nitrous acid did not occur.
処理開始から１５日後に、ＤＯ濃度を曝気槽の散気球の上部で約０．４ｍｇ／Ｌとなるように曝気風量を調整したところ、系内に亜硝酸が蓄積するようになった。
After 15 days from the start of the treatment, when the aeration air volume was adjusted so that the DO concentration was about 0.4 mg / L at the upper part of the aeration tank in the aeration tank, nitrous acid accumulated in the system.
しかし、原水の汚泥濃度が変動したため、時折酸素が供給過剰となり、硝酸が生成された。
However, since the sludge concentration in the raw water fluctuated, oxygen was occasionally oversupplied and nitric acid was produced.
このときの流入原水のＮＨ４−Ｎ濃度と処理水のＮＨ４−Ｎ濃度、ＮＯ２−Ｎ濃度及びＮＯ３−Ｎ濃度の経時変化を図２に示す。
FIG. 2 shows changes over time in the NH 4 -N concentration of the inflow raw water and the NH 4 -N concentration, the NO 2 -N concentration, and the NO 3 -N concentration of the treated water at this time.
また、各測定日のデータを、横軸に処理水のＮＨ４−Ｎ濃度、縦軸に処理水のＮＯ３−Ｎ濃度を取ってプロットしたものを図３に示す。
In addition, FIG. 3 shows the data plotted for each measurement day with the horizontal axis representing the NH 4 —N concentration of the treated water and the vertical axis representing the NO 3 —N concentration of the treated water.
図３より、処理水中のＮＨ４−Ｎ濃度が２０ｍｇ／Ｌ以上であれば、処理水中には硝酸が殆ど検出されず、亜硝酸型硝化が行われていることがわかる。
FIG. 3 shows that when the NH 4 —N concentration in the treated water is 20 mg / L or more, nitric acid is hardly detected in the treated water, and nitrite type nitrification is performed.
実施例１
実験例１の結果から、実験例１において、処理水を受ける処理水槽にアンモニア性窒素濃度の測定装置として隔膜型イオン電極を設け、この測定値が２０〜４０ｍｇ／Ｌとなるように曝気風量を調節して処理を行ったところ、得られた処理水はＮＯ２−Ｎ濃度は８０〜１００ｍｇ／Ｌ、ＮＯ３−Ｎ濃度は５ｍｇ／Ｌ以下となり、長期に亘り安定な亜硝酸型硝化を行うことができた。
Example 1
From the result of Experimental Example 1, a diaphragm type ion electrode is provided as a measuring device for ammonia nitrogen concentration in the treated water tank that receives treated water in Experimental Example 1, and the aeration air volume is adjusted so that the measured value is 20 to 40 mg / L. When the treatment was carried out by adjusting, the obtained treated water had a NO 2 -N concentration of 80 to 100 mg / L and a NO 3 -N concentration of 5 mg / L or less, and stable nitrite type nitrification was performed over a long period of time. I was able to.
【発明の効果】
以上詳述した通り、本発明のアンモニア性窒素含有水の硝化方法によれば、アンモニア性窒素含有水をアンモニア酸化細菌の存在下に曝気して硝化するにあたり、曝気風量を的確に制御して硝化槽内のＤＯ濃度を低く保ち、長期にわたり安定な亜硝酸型硝化を行うことができる。
【Effect of the invention】
As described above in detail, according to the nitrification method for ammonia nitrogen-containing water of the present invention, when the ammonia nitrogen-containing water is aerated in the presence of ammonia-oxidizing bacteria and nitrified, the amount of aeration air is precisely controlled to nitrify. The DO concentration in the tank can be kept low, and stable nitrite type nitrification can be performed over a long period of time.
本発明の方法で得られる、アンモニア性窒素が亜硝酸性窒素に硝化され、硝酸性窒素濃度の低い処理水は、ＡＮＡＭＭＯＸ菌を用いる生物脱窒処理の原水として効率的に処理することができる。
【図面の簡単な説明】
【図１】
本発明のアンモニア性窒素含有水の硝化方法の実施の形態を示す系統図である。
【図２】
実験例１における原水のＮＨ４−Ｎ濃度と処理水水質の経時変化を示すグラフである。
【図３】
実験例１における処理水のＮＨ４−Ｎ濃度とＮＯ３−Ｎ濃度との関係を示すグラフである。
【符号の説明】
１ 硝化槽
２ 散気管
３ ブロワ
４ 処理水槽
５ ＮＨ４−Ｎ濃度測定装置
Treated water obtained by the method of the present invention, in which ammoniacal nitrogen is nitrified to nitrite nitrogen and has a low nitrate nitrogen concentration, can be efficiently treated as raw water for biological denitrification treatment using ANAMOX bacteria.
[Brief description of the drawings]
[Figure 1]
It is a systematic diagram which shows embodiment of the nitrification method of ammonia nitrogen containing water of this invention.
[Figure 2]
Is a graph showing changes with time of the treated water quality and NH 4 -N concentration of the raw water in Experimental Example 1.
[Fig. 3]
It is a graph showing the relationship between the NH 4 -N concentration and NO 3 -N concentration in the treated water in Experimental Example 1.
[Explanation of symbols]
1 nitrification tank 2
Claims (1)
該硝化槽内の液ｐＨは５〜９、亜硝酸イオン濃度が５０〜１００００ｍｇ−Ｎ／Ｌ、温度が１０〜４０℃、窒素負荷が０．１〜３ｋｇ−Ｎ／ｍ ３ ・ｄａｙであり、
該硝化槽内の硝化液又は硝化槽から流出する硝化液中のアンモニア性窒素濃度を測定し、この測定値に基いて、該硝化槽内の硝化液又は硝化槽から流出する硝化液中のアンモニア性窒素濃度が２０〜１００ｍｇ／Ｌとなるように曝気風量を調節して亜硝酸型硝化を行うことを特徴とするアンモニア性窒素含有水の硝化方法。 Ammonia nitrogen-containing water is introduced into a nitrification tank where it is aerated in the presence of ammonia-oxidizing bacteria and then nitrified, and nitrification is performed, and ammonia nitrogen-containing water that controls nitrification by adjusting the amount of aeration air in the nitrification tank In the nitrification method of
The liquid pH in the nitrification tank is 5 to 9, the nitrite ion concentration is 50 to 10,000 mg-N / L, the temperature is 10 to 40 ° C., and the nitrogen load is 0.1 to 3 kg-N / m 3 · day.
Ammonia nitrogen concentration in the nitrification liquid in the nitrification tank or in the nitrification liquid flowing out from the nitrification tank is measured, and based on this measurement value, the ammonia in the nitrification liquid in the nitrification tank or the nitrification liquid flowing out from the nitrification tank A method for nitrifying ammonia-containing nitrogen, characterized in that nitrite-type nitrification is performed by adjusting the amount of aeration air so that the nitrogenous concentration is 20 to 100 mg / L.
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| JP2005131451A (en) * | 2003-10-28 | 2005-05-26 | Kobelco Eco-Solutions Co Ltd | Nitrification method for ammonia nitrogen-containing wastewater |
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