JP3736397B2 - Method for treating organic matter containing nitrogen component - Google Patents
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- JP3736397B2 JP3736397B2 JP2001226188A JP2001226188A JP3736397B2 JP 3736397 B2 JP3736397 B2 JP 3736397B2 JP 2001226188 A JP2001226188 A JP 2001226188A JP 2001226188 A JP2001226188 A JP 2001226188A JP 3736397 B2 JP3736397 B2 JP 3736397B2
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Description
【０００１】
【発明の属する技術分野】
本発明は窒素成分を含む有機物の処理方法に係り、特に窒素成分を含む有機性汚濁物質の水熱処理液中の窒素成分を生物脱窒処理により効率的に処理する方法に関する。
【０００２】
【従来の技術】
有機物は、水の存在下で高熱処理することによって、液化ないし低分子化される。この反応は水熱反応と呼ばれており、反応速度が速いことから有機性汚濁物質の処理への応用が検討されている。
【０００３】
水熱反応後の有機物は、反応前よりも生物分解性が向上することが多い。この理由は、
▲１▼ 固形物が液化することで酸素分解を受けやすくなる。
▲２▼ 低分子化されることで加水分解されやすくなる。
ことなどが挙げられる。
【０００４】
このため、従来、水熱反応を利用した有機物の処理プロセスとして、水熱処理と生物処理とを組み合わせたプロセスが報告されている。このうち、好気的な生物処理の報告事例は村上定瞭ら（１９９９）「水熱反応を用いる汚泥消滅型生物法（水熱・生物法）に関する研究」環境技術Vol.28, No.8、嫌気的な生物処理の報告事例はN. Weiszら (2000) “Sludge disintegration with thermal hydrolysis-cases from Norway, Denmark and United Kingdom”、1st World Water Congress of the International Water Association (IWA) Paris 3-7 July 2000がある。
【０００５】
一方、アンモニア性窒素の処理方法として、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微生物」と称す。）を利用し、アンモニア性窒素を亜硝酸性窒素の共存下に反応させて脱窒する方法が提案された。この方法では、従来の硝化脱窒法に対して、有機物の添加が不要であり、酸素供給のための曝気が不要である、余剰汚泥の発生量が少ないといった利点がある。
【０００６】
このＡＮＡＭＭＯＸ微生物を利用する生物脱窒プロセスは、Strous, M. et. al. (1998) Appl. Microbiol. Biotechnol. Vol.50, p.589-596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。
【０００７】
【化１】
この反応では、アンモニア性窒素は、亜硝酸性窒素と共に窒素ガスに分解されるが、同時に亜硝酸性窒素は本反応の阻害剤となる。この阻害についてはStrous, M. et. al. (1999) Appl. Environ. Microbiol. Vol.65, p.3248で報告されているように、亜硝酸性窒素濃度９０ｍｇ−Ｎ／Ｌ以上で顕著となる。
【０００９】
【発明が解決しようとする課題】
窒素成分を含む有機性汚濁物質を水熱処理し、その処理液を生物処理すると、有機物の生物分解に伴って無機窒素成分が生成する。代表的に生成する無機窒素成分はアンモニアであり、この除去にも生物処理を用いることができる。
【００１０】
一方、水熱反応では、逆に、わずかながら生物学的に難分解性の有機物が生成する場合がある。この原因は特定されていないが、特に、炭水化物と蛋白質を含む有機物の水熱反応では顕著である。難分解性の有機物は茶褐色を呈することが多く、これが高濃度になると生物反応を阻害する場合があると言われている。
【００１１】
実際、窒素成分を含む有機性汚濁物質の水熱処理液を更に生物処理して得られるアンモニアを含む生物処理液（以下、水熱処理液を生物処理して得られる液を「水熱・生物処理液」と称す場合がある。）を、上述のＡＮＡＭＭＯＸ微生物で生物脱窒させるには、報告されている亜硝酸性窒素濃度よりも低い濃度に維持する必要があった。
【００１２】
本発明は、このような実情に鑑みてなされたものであって、窒素成分を含む有機物を水熱処理し、水熱処理液中の窒素成分を効率良く生物脱窒させる窒素成分を含む有機物の処理方法を提供することを目的とする。
【００１３】
【課題を解決するための手段】
本発明の窒素成分を含む有機物の処理方法は、窒素成分を含む有機物を水の存在下に熱処理して該有機物を液化及び／又は低分子化する水熱反応工程と、該水熱反応工程から排出される、液化物及び／又は低分子化物を含む処理物を生物処理する生物処理工程と、該生物処理工程から排出されるアンモニア性窒素を含む処理液を、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脱窒微生物の作用により亜硝酸性窒素の存在下に脱窒処理する脱窒処理工程とを有する窒素成分を含む有機物の処理方法であって、前記脱窒処理工程における亜硝酸性窒素の濃度を７０ｍｇ−Ｎ／Ｌ以下とすることを特徴とする。
【００１４】
本発明では、窒素成分を含む有機物の水熱処理液を必要に応じて希釈した後生物処理し、生物処理液を必要に応じて希釈した後、ＡＮＡＭＭＯＸ微生物により脱窒処理することにより、効率的に窒素成分を除去することができる。
【００１５】
この脱窒処理時の亜硝酸性窒素濃度を７０ｍｇ−Ｎ／Ｌ以下とすることにより、反応に対する阻害を防止して、効率的な脱窒処理を行える。
【００１６】
【発明の実施の形態】
以下に本発明の窒素成分を含む有機物の処理方法の実施の形態を詳細に説明する。
【００１７】
本発明においては、まず窒素成分を含む有機物を水熱反応させる。
【００１８】
ここで、処理対象となる窒素成分を含む有機物としては、下水処理汚泥、産業排水処理汚泥、家畜糞尿、生ゴミ等が挙げられる。
【００１９】
このような窒素成分を含む有機物を水熱処理するには、被処理物を、必要に応じて酸化剤、補助燃料、水等と共に反応器内に入れ、高温高圧状態に保つことで、被処理有機物を酸化分解ないし加水分解等により分解して液化又は低分子化する。この水熱処理を行うには、１２０℃以上（０．２ＭＰａ以上）例えば１５０〜２２０℃（０．５〜３．０ＭＰａ）の温度又は圧力条件下で０．２Ｈｒ以上例えば０．５〜１．０Ｈｒ保つことが好ましい。
【００２０】
水熱処理を行う場合、被処理有機物に酸化剤としてＨ２Ｏ２、Ｆｅ２＋、ＮＯＸを１０〜８，０００ｍｇ／Ｌ（０．１〜２００ｍＭ）程度添加してもよい。
【００２１】
水熱反応で得られた水熱処理液は、次いで、生物処理する。この生物処理は、好気性生物処理であっても良く、嫌気性生物処理であっても良く、その両方を行っても良い。ＡＮＡＭＭＯＸ微生物は酸素により阻害を受けることから、一般的には嫌気性生物処理が好ましく、好気性生物処理を行った場合には、脱窒処理に先立ち、生物処理液中の溶存酸素を除去することが好ましい。
【００２２】
この生物処理に際しては、必要に応じて水熱処理液を希釈しても良い。
【００２３】
生物処理液は次いでＡＮＡＭＭＯＸ微生物により脱窒処理する。
【００２４】
ＡＮＡＭＭＯＸ微生物による脱窒処理は、前述の如く、アンモニア性窒素を亜硝酸性窒素の共存下に反応させるものであることから、生物処理液を脱窒処理するに当っては、必要量の亜硝酸性窒素を生物処理液に添加する。
【００２５】
ＡＮＡＭＭＯＸ微生物による脱窒処理は、前述の反応式に従って行われるため、アンモニア性窒素及び亜硝酸性窒素の残留を防止して、脱窒処理液中の窒素成分を低減するために、脱窒処理に供される液中のアンモニア性窒素と亜硝酸性窒素の割合は、モル比でアンモニア性窒素１に対して亜硝酸性窒素０．５〜２、特に１〜１．５とするのが好ましいが、前述の如く、亜硝酸性窒素による反応阻害を防止するために、脱窒工程で共存する亜硝酸性窒素濃度は７０ｍｇ−Ｎ／Ｌ以下とする。
【００２６】
後述の実施例１の結果からも明らかなように、共存する亜硝酸性窒素濃度が７０ｍｇ−Ｎ／Ｌを超えるとＡＮＡＭＭＯＸ微生物が阻害を受け、アンモニア性窒素の除去活性が低下する。亜硝酸性窒素は７０ｍｇ−Ｎ／Ｌ以下であれば良く、液中のアンモニア性窒素濃度との割合が上記範囲となるように調整すれば良い。
【００２７】
なお、生物処理液に添加する亜硝酸性窒素としては、薬品としての亜硝酸ナトリウム等を用いることができるが、亜硝酸性窒素を含む排水を用いても良く、また、アンモニア性窒素を亜硝酸化したものを用いても良い。
【００２８】
脱窒反応槽の型式に特に制限はなく、汚泥懸濁法、固定床、流動床、担体添加法、ＡＮＡＭＭＯＸ微生物のグラニュールを保持するＵＳＢ（Upflow Sludge Bed：上向流汚泥床）式等、各種のものを採用することができる。
【００２９】
なお、この脱窒処理に際しても、必要に応じて水熱・生物処理液を希釈しても良い。
【００３０】
即ち、亜硝酸性窒素による阻害は、水熱反応で生成する難分解性の有機物の溶解性ＣＯＤ成分により助長されるため、水熱・生物処理液中を希釈して溶解性ＣＯＤ成分濃度を低減することが好ましい。このための希釈は生物処理前の水熱処理液に対して行っても同様の効果が得られる。
【００３１】
本発明では、水熱処理液又は水熱・生物処理液を希釈することにより、ＡＮＡＭＭＯＸ微生物による脱窒処理に供する液中の溶解性ＣＯＤ濃度を１，０００ｍｇ／Ｌ以下とすることが好ましい。
【００３２】
希釈液としては、工水、井水、市水等を用いても良く、また、脱窒処理液を用いても良い。更に、別系統の処理水を用いることもできる。
【００３３】
【実施例】
以下に実施例を挙げて本発明をより具体的に説明する。
【００３４】
実施例１
下水の混合生汚泥（初沈汚泥と余剰汚泥をほぼ当量含む汚泥）７，０００ｍｇ−ＴＶＳ／Ｌを１８０℃、１ＭＰａの条件で６０分間水熱処理を行った。この水熱処理液を嫌気的に生物分解させたところ、混合生汚泥単位重量当たり０．３ＮＬ／ｇ−ＴＶＳのメタンガスが生成した。生物処理液には５００ｍｇ−Ｎ／Ｌのアンモニア態窒素、３００ｍｇ−Ｎ／Ｌの溶解性ＣＯＤが含まれていた。
【００３５】
この生物処理液を希釈することなく（Ｎｏ．１）、或いは水で１．５倍（Ｎｏ．２）又は２倍（Ｎｏ．３）に希釈すると共に、更に亜硝酸性窒素として亜硝酸ナトリウムを添加した。このとき、亜硝酸ナトリウムは、液中に共存させる亜硝酸性窒素濃度を種々変えて添加した。各々の液について、ＡＮＡＭＭＯＸ微生物による脱窒処理実験を行った。
【００３６】
実験は、容積２Ｌの密閉反応槽に別の装置から採取したＡＮＡＭＭＯＸ微生物を１ｇ−ＶＳＳ投入し、被処理液を１０Ｌ／ｄａｙで通水し、ｐＨ６〜８．８、温度３０℃で行った。また、Ｎｏ．４として、水熱・生物処理液ではなく、５００ｍｇ−Ｎ／Ｌのアンモニア水溶液について、同様に共存させる亜硝酸性窒素濃度を変えて脱窒処理実験も行った。
【００３７】
得られた処理液の窒素濃度からＮｏ．４における亜硝酸添加濃度３０〜９０ｍｇ／Ｌにおける値に対する各実験のアンモニア窒素除去活性の割合を調べ、結果を図１に示した。
【００３８】
図１より明らかなように、Ｎｏ．４のアンモニア水溶液の場合には、亜硝酸性窒素濃度が９０ｍｇ−Ｎ／Ｌ程度まで阻害を受けることはないが、水熱・生物処理液では、Ｎｏ．１の無希釈の場合も、Ｎｏ．２，３の希釈を行った場合も、亜硝酸性窒素濃度が７０ｍｇ−Ｎ／Ｌを超えると反応阻害によりアンモニア除去活性が低下し、特に、無希釈の場合に、活性低下が顕著に現れる。
【００３９】
従って、水熱・生物処理液のＡＮＡＭＭＯＸ微生物による脱窒処理工程では、共存させる亜硝酸性窒素濃度を７０ｍｇ−Ｎ／Ｌ以下とすることが好ましいことがわかる。
【００４０】
【発明の効果】
以下詳述した通り、本発明の窒素成分を含む有機物の処理方法によれば、窒素成分を含む有機物を水熱処理し、窒素成分を含む有機性汚濁物質の水熱処理液中の窒素成分を生物脱窒処理により効率的に処理することができる。
【図面の簡単な説明】
【図１】実施例１における亜硝酸性窒素濃度とアンモニア除去活性との関係を示すグラフである。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for treating an organic substance containing a nitrogen component, and more particularly to a method for efficiently treating a nitrogen component in a hydrothermal treatment liquid of an organic pollutant containing a nitrogen component by a biological denitrification treatment.
[0002]
[Prior art]
Organic substances are liquefied or reduced in molecular weight by high heat treatment in the presence of water. This reaction is called a hydrothermal reaction, and since its reaction rate is fast, its application to the treatment of organic pollutants is being studied.
[0003]
The organic matter after the hydrothermal reaction is often more biodegradable than before the reaction. The reason is
(1) Oxygen decomposition is easily caused by liquefaction of solids.
(2) It becomes easy to be hydrolyzed by lowering the molecular weight.
And so on.
[0004]
For this reason, conventionally, a process combining hydrothermal treatment and biological treatment has been reported as an organic matter treatment process utilizing a hydrothermal reaction. Among these, a report on aerobic biological treatment is reported by Sadaaki Murakami (1999) “Study on sludge extinguishing biological method using hydrothermal reaction (hydrothermal / biological method)” Environmental Technology Vol.28, No.8 An example of anaerobic biological treatment is reported in N. Weisz et al. (2000) “Sludge disintegration with thermal hydrolysis-cases from Norway, Denmark and United Kingdom”, 1 st World Water Congress of the International Water Association (IWA) Paris 3- There is 7 July 2000.
[0005]
On the other hand, as a method for treating ammonia nitrogen, in recent years, an autotrophic microorganism (hereinafter referred to as “ANAMOX microorganism”) using ammonia nitrogen as an electron donor and nitrite nitrogen as an electron acceptor has been used. A method for denitrification by reacting reactive nitrogen in the presence of nitrite nitrogen was proposed. This method has advantages over the conventional nitrification denitrification method in that it is not necessary to add organic substances, aeration for supplying oxygen is unnecessary, and the generation amount of excess sludge is small.
[0006]
This biodenitrification process using ANAMOX microorganisms has been reported in Strous, M. et. Al. (1998) Appl. Microbiol. Biotechnol. Vol. 50, p.589-596. It is thought that ammonia nitrogen and nitrite nitrogen react and decompose into nitrogen gas.
[0007]
[Chemical 1]
In this reaction, ammonia nitrogen is decomposed into nitrogen gas together with nitrite nitrogen, and nitrite nitrogen simultaneously becomes an inhibitor of this reaction. About this inhibition, as reported in Strous, M. et. Al. (1999) Appl. Environ. Microbiol. Vol.65, p.3248, the inhibition is remarkable at a nitrite nitrogen concentration of 90 mg-N / L or more. Become.
[0009]
[Problems to be solved by the invention]
When an organic pollutant containing a nitrogen component is subjected to a hydrothermal treatment and the treatment liquid is biologically treated, an inorganic nitrogen component is generated along with biodegradation of the organic matter. The inorganic nitrogen component typically generated is ammonia, and biological treatment can also be used for this removal.
[0010]
On the other hand, in the hydrothermal reaction, on the contrary, a slightly biologically indegradable organic substance may be generated. Although the cause of this is not specified, it is particularly remarkable in the hydrothermal reaction of organic substances including carbohydrates and proteins. Refractory organic substances often have a brownish color, and it is said that biological reactions may be inhibited when the concentration is high.
[0011]
Actually, a biological treatment liquid containing ammonia obtained by further biological treatment of a hydrothermal treatment liquid of an organic pollutant containing a nitrogen component (hereinafter, a liquid obtained by biological treatment of the hydrothermal treatment liquid is referred to as “hydrothermal / biological treatment liquid”. In order to perform biodenitrification with the above-described ANAMOX microorganisms, it was necessary to maintain a concentration lower than the reported nitrite nitrogen concentration.
[0012]
The present invention has been made in view of such circumstances, and a method for treating an organic substance containing a nitrogen component that hydrothermally treats an organic substance containing a nitrogen component and efficiently biologically denitrifies the nitrogen component in the hydrothermal treatment liquid. The purpose is to provide.
[0013]
[Means for Solving the Problems]
The method for treating an organic substance containing a nitrogen component according to the present invention includes a hydrothermal reaction step in which an organic substance containing a nitrogen component is heat-treated in the presence of water to liquefy and / or reduce the molecular weight of the organic substance, and the hydrothermal reaction step. A biological treatment process for biologically treating a treated product containing a liquefied product and / or a low molecular weight product that is discharged, and a treatment solution containing ammoniacal nitrogen discharged from the biological treatment step is used as an electron donor. the nitrite nitrogen to a denitrification process and method of processing organic material containing nitrogen component having to be denitrified in the presence of nitrite nitrogen by the action of denitrifying organisms to electron acceptor, the de The concentration of nitrite nitrogen in the nitrogen treatment step is 70 mg-N / L or less .
[0014]
In the present invention, an organic hydrothermal treatment liquid containing a nitrogen component is diluted as necessary, and then biologically treated. After the biological treatment liquid is diluted as necessary, it is efficiently denitrified by the ANAMOX microorganism. The nitrogen component can be removed.
[0015]
By setting the concentration of nitrite nitrogen during this denitrification treatment to 70 mg-N / L or less, inhibition of the reaction can be prevented and efficient denitrification treatment can be performed.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the method for treating an organic substance containing a nitrogen component according to the present invention will be described in detail.
[0017]
In the present invention, an organic substance containing a nitrogen component is first subjected to a hydrothermal reaction.
[0018]
Here, examples of the organic substance containing a nitrogen component to be treated include sewage treatment sludge, industrial wastewater treatment sludge, livestock manure, and garbage.
[0019]
In order to perform hydrothermal treatment of such organic substances containing nitrogen components, the object to be treated is placed in a reactor together with an oxidant, auxiliary fuel, water, etc., if necessary, and kept at a high temperature and high pressure, so that the substance to be treated is treated. Is liquefied or reduced in molecular weight by oxidative decomposition or hydrolysis. In order to perform this hydrothermal treatment, at a temperature or pressure of 120 ° C. or higher (0.2 MPa or higher), for example 150 to 220 ° C. (0.5 to 3.0 MPa), 0.2 Hr or higher, for example 0.5 to 1.0 Hr. It is preferable to keep.
[0020]
When hydrothermal treatment is performed, about 10 to 8,000 mg / L (0.1 to 200 mM) of H 2 O 2 , Fe 2+ , and NO X may be added to the organic material to be treated as oxidizing agents.
[0021]
Next, the hydrothermal treatment liquid obtained by the hydrothermal reaction is biologically treated. This biological treatment may be an aerobic biological treatment, an anaerobic biological treatment, or both. Since ANAMMOX microorganisms are inhibited by oxygen, anaerobic biological treatment is generally preferred. When aerobic biological treatment is performed, dissolved oxygen in the biological treatment solution should be removed prior to denitrification treatment. Is preferred.
[0022]
In this biological treatment, the hydrothermal treatment liquid may be diluted as necessary.
[0023]
The biological treatment solution is then denitrified by the ANAMOX microorganism.
[0024]
As described above, the denitrification treatment by the ANAMOX microorganism is a reaction in which ammonia nitrogen is reacted in the presence of nitrite nitrogen. Therefore, when denitrifying a biological treatment solution, a necessary amount of nitrous acid is used. Sexual nitrogen is added to the biological treatment solution.
[0025]
Since the denitrification treatment by the ANAMOX microorganism is performed according to the above-described reaction formula, in order to prevent the remaining of ammonia nitrogen and nitrite nitrogen and reduce the nitrogen component in the denitrification treatment liquid, the denitrification treatment is performed. The ratio of ammonia nitrogen and nitrite nitrogen in the supplied liquid is preferably 0.5 to 2, particularly 1 to 1.5 nitrite nitrogen with respect to ammonia nitrogen 1 in molar ratio. , as described above, in order to prevent reaction inhibition by nitrite nitrogen, nitrite nitrogen concentration coexist in denitrification are you than 70mg-N / L.
[0026]
As is clear from the results of Example 1 described later, when the coexisting nitrite nitrogen concentration exceeds 70 mg-N / L, the ANMAMOX microorganisms are inhibited, and the ammonia nitrogen removal activity decreases. Nitrite nitrogen should just be 70 mg-N / L or less, and should just adjust it so that a ratio with the ammoniacal nitrogen concentration in a liquid may become the said range.
[0027]
As nitrite nitrogen added to the biological treatment liquid, sodium nitrite as a chemical can be used. However, waste water containing nitrite nitrogen may be used, and ammonia nitrogen may be used as nitrite. It may be used.
[0028]
There are no particular restrictions on the type of denitrification reactor, such as sludge suspension method, fixed bed, fluidized bed, carrier addition method, USB (Upflow Sludge Bed) type that holds granules of ANAMOX microorganisms, etc. Various things can be adopted.
[0029]
In this denitrification treatment, the hydrothermal / biological treatment solution may be diluted as necessary.
[0030]
In other words, the inhibition by nitrite nitrogen is promoted by the soluble COD component of persistent organic matter generated by hydrothermal reaction, so the concentration of soluble COD component is reduced by diluting the hydrothermal / biological treatment liquid. It is preferable to do. Even if dilution for this purpose is performed on the hydrothermal treatment liquid before biological treatment, the same effect can be obtained.
[0031]
In the present invention, it is preferable to dilute the hydrothermal treatment liquid or the hydrothermal / biological treatment liquid so that the soluble COD concentration in the liquid to be subjected to the denitrification treatment by the ANAMMOX microorganism is 1,000 mg / L or less.
[0032]
As the diluent, industrial water, well water, city water, or the like may be used, or a denitrification treatment liquid may be used. Furthermore, the treated water of another system can also be used.
[0033]
【Example】
Hereinafter, the present invention will be described more specifically with reference to examples.
[0034]
Example 1
Mixed raw sludge of sewage (sludge containing approximately the same amount of primary sludge and surplus sludge) was subjected to hydrothermal treatment for 60 minutes under conditions of 180 ° C. and 1 MPa at 7,000 mg-TVS / L. When this hydrothermal treatment liquid was anaerobically biodegraded, 0.3 NL / g-TVS of methane gas was generated per unit weight of the mixed raw sludge. The biological treatment solution contained 500 mg-N / L ammonia nitrogen and 300 mg-N / L soluble COD.
[0035]
Without diluting this biological treatment solution (No. 1), or diluting with water 1.5 times (No. 2) or 2 times (No. 3), sodium nitrite is added as nitrite nitrogen. Added. At this time, sodium nitrite was added with various concentrations of nitrite nitrogen to be coexisted in the liquid. About each liquid, the denitrification process experiment by the ANAMOX microorganism was conducted.
[0036]
The experiment was performed at a pH of 6 to 8.8 and a temperature of 30 ° C. by introducing 1 g-VSS of ANAMMOX microorganisms collected from another apparatus into a 2 L volume closed reaction tank and passing the liquid to be treated at 10 L / day. No. As for No. 4, a denitrification treatment experiment was also conducted on the 500 mg-N / L aqueous ammonia solution instead of the hydrothermal / biological treatment solution while changing the concentration of nitrite nitrogen to coexist in the same manner.
[0037]
From the nitrogen concentration of the obtained treatment liquid, No. 1 was obtained. The ratio of ammonia nitrogen removal activity of each experiment with respect to the value at a nitrous acid addition concentration of 30 to 90 mg / L in Fig. 4 was examined, and the results are shown in Fig. 1.
[0038]
As is clear from FIG. In the case of the aqueous ammonia solution of No. 4, the nitrite nitrogen concentration is not inhibited up to about 90 mg-N / L. No dilution of No. 1 Even when the dilutions of 2 and 3 are performed, when the nitrite nitrogen concentration exceeds 70 mg-N / L, the ammonia removal activity decreases due to reaction inhibition, and particularly in the case of no dilution, the activity decrease remarkably appears.
[0039]
Therefore, it can be seen that in the denitrification treatment step of the hydrothermal / biological treatment solution by the ANAMMOX microorganism, the coexisting nitrite nitrogen concentration is preferably 70 mg-N / L or less.
[0040]
【The invention's effect】
As described in detail below, according to the method for treating an organic substance containing a nitrogen component of the present invention, the organic substance containing the nitrogen component is hydrothermally treated, and the nitrogen component in the hydrothermal treatment liquid of the organic pollutant containing the nitrogen component is biologically removed. It can process efficiently by nitriding.
[Brief description of the drawings]
1 is a graph showing the relationship between nitrite nitrogen concentration and ammonia removal activity in Example 1. FIG.
Claims (1)
該水熱反応工程から排出される、液化物及び／又は低分子化物を含む処理物を生物処理する生物処理工程と、
該生物処理工程から排出されるアンモニア性窒素を含む処理液を、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脱窒微生物の作用により亜硝酸性窒素の存在下に脱窒処理する脱窒処理工程と
を有する窒素成分を含む有機物の処理方法であって、
前記脱窒処理工程における亜硝酸性窒素の濃度を７０ｍｇ−Ｎ／Ｌ以下とすることを特徴とする窒素成分を含む有機物の処理方法。A hydrothermal reaction step in which an organic substance containing a nitrogen component is heat-treated in the presence of water to liquefy and / or reduce the molecular weight of the organic substance;
A biological treatment step for biologically treating a treated product containing a liquefied product and / or a low molecular weight product discharged from the hydrothermal reaction step;
A treatment liquid containing ammonia nitrogen discharged from the biological treatment process is brought into the presence of nitrite nitrogen by the action of a denitrifying microorganism using ammonia nitrogen as an electron donor and nitrite nitrogen as an electron acceptor. A denitrification treatment step for denitrification treatment of an organic substance containing a nitrogen component,
The processing method of the organic substance containing the nitrogen component characterized by making the density | concentration of nitrite nitrogen in the said denitrification process process into 70 mg-N / L or less .
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| JP3894329B2 (en) | 2004-06-18 | 2007-03-22 | 株式会社日立プラントテクノロジー | Method of operating anaerobic ammonia oxidation tank and anaerobic ammonia oxidation apparatus |
| JP4822800B2 (en) * | 2005-10-24 | 2011-11-24 | 公立大学法人大阪府立大学 | Methane fermentation treatment method for garbage or food residue |
| JP4838013B2 (en) * | 2006-02-27 | 2011-12-14 | 国立大学法人静岡大学 | Nitrogen-containing organic substance processing apparatus and processing method |
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| CN118063025B (en) * | 2024-02-05 | 2024-07-30 | 江南大学 | A method for energy conversion and full-scale treatment of high-salt and high-nitrogen hydrothermal carbonization liquid |
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