JP2007117902A - Method and apparatus for treating ammonium ion-containing wastewater - Google Patents
Method and apparatus for treating ammonium ion-containing wastewater Download PDFInfo
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- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 title claims abstract description 26
- 238000000034 method Methods 0.000 title claims abstract description 25
- 239000002351 wastewater Substances 0.000 title claims abstract description 25
- -1 nitrite ions Chemical class 0.000 claims abstract description 67
- 238000006243 chemical reaction Methods 0.000 claims abstract description 38
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 32
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 claims abstract description 21
- 229940005654 nitrite ion Drugs 0.000 claims abstract description 20
- 229910017464 nitrogen compound Inorganic materials 0.000 claims abstract description 20
- 150000002830 nitrogen compounds Chemical class 0.000 claims abstract description 20
- 241000894006 Bacteria Species 0.000 claims abstract description 13
- 230000001651 autotrophic effect Effects 0.000 claims abstract description 10
- 238000005259 measurement Methods 0.000 claims abstract description 10
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 33
- 229910052757 nitrogen Inorganic materials 0.000 claims description 15
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 claims description 4
- 238000004065 wastewater treatment Methods 0.000 claims description 4
- 229910002651 NO3 Inorganic materials 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 239000000370 acceptor Substances 0.000 claims 2
- 230000003647 oxidation Effects 0.000 abstract description 3
- 238000007254 oxidation reaction Methods 0.000 abstract description 3
- 238000011068 loading method Methods 0.000 abstract 1
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 15
- LPXPTNMVRIOKMN-UHFFFAOYSA-M sodium nitrite Chemical compound [Na+].[O-]N=O LPXPTNMVRIOKMN-UHFFFAOYSA-M 0.000 description 12
- 241001453382 Nitrosomonadales Species 0.000 description 6
- 235000010288 sodium nitrite Nutrition 0.000 description 6
- JVMRPSJZNHXORP-UHFFFAOYSA-N ON=O.ON=O.ON=O.N Chemical compound ON=O.ON=O.ON=O.N JVMRPSJZNHXORP-UHFFFAOYSA-N 0.000 description 5
- IOVCWXUNBOPUCH-UHFFFAOYSA-N Nitrous acid Chemical compound ON=O IOVCWXUNBOPUCH-UHFFFAOYSA-N 0.000 description 3
- 229910001873 dinitrogen Inorganic materials 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 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 2
- 230000000802 nitrating effect Effects 0.000 description 2
- 241000233866 Fungi Species 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 230000001580 bacterial effect Effects 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000000415 inactivating effect Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 230000001546 nitrifying effect Effects 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 230000001766 physiological effect Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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Abstract
Description
本発明は、アンモニウムイオンを含有した排水の処理に際し、亜硝酸イオンを積極的に添加して嫌気性条件下で独立栄養性細菌と接触させることにより、アンモニウムイオンを電子供与体とし、亜硝酸イオンを電子受容体として脱窒反応を行うアンモニウムイオン含有排水の処理方法および装置に関する。 In the treatment of wastewater containing ammonium ions, the present invention actively adds nitrite ions and makes them contact with autotrophic bacteria under anaerobic conditions, whereby ammonium ions are used as electron donors, and nitrite ions The present invention relates to a method and apparatus for treating ammonium ion-containing wastewater that performs a denitrification reaction using as an electron acceptor.
近年、排水処理の分野においては、微生物の生理活性を利用して排水中の汚濁物質を無害な物質に変化させて処理を行う生物処理が多用されている。一般的なアンモニア性窒素含有排水の処理においては、排水を好気性条件下において独立栄養性のアンモニア酸化細菌および亜硝酸酸化細菌と接触させて亜硝酸イオンもしくは硝酸イオンにまで酸化し、その後無酸素条件下において従属栄養性の脱窒細菌と反応させて窒素ガスにまで還元して系外へ排出する。また近年では、新しい窒素処理プロセスとしてANAMMOX（ANaerobic AMMonium OXidation）法が提唱されている。本手法は排水中のアンモニウムイオンの半量を好気性条件下でアンモニア酸化細菌により亜硝酸イオンにまで酸化し、アンモニウムイオンと亜硝酸イオンをモル比で１：１以上に調整後、嫌気性条件下で独立栄養性のANAMMOX細菌群と接触させて窒素ガスに変化させて系外へ排出するものである。 2. Description of the Related Art In recent years, in the field of wastewater treatment, biological treatment is frequently used in which treatment is performed by changing the pollutant in wastewater to harmless substances using the physiological activity of microorganisms. In general treatment of wastewater containing ammonia nitrogen, the wastewater is contacted with autotrophic ammonia-oxidizing bacteria and nitrite-oxidizing bacteria under aerobic conditions to oxidize to nitrite ions or nitrate ions, and then oxygen-free Under conditions, it reacts with heterotrophic denitrifying bacteria to reduce it to nitrogen gas and discharge it out of the system In recent years, the ANAMMOX (ANaerobic AMMonium OXidation) method has been proposed as a new nitrogen treatment process. In this method, half of the ammonium ions in the wastewater are oxidized to nitrite ions by ammonia-oxidizing bacteria under aerobic conditions, and the ammonium ions and nitrite ions are adjusted to a molar ratio of 1: 1 or more, and then anaerobic conditions are satisfied. In contact with the autotrophic ANAMMOX bacteria group, it is converted into nitrogen gas and discharged out of the system.
ANAMMOX反応を利用した排水の処理方法に関しては、前段の亜硝酸化反応の制御が重要なポイントとなる。通常の硝化反応においては、前述のようにアンモニア酸化細菌と亜硝酸酸化細菌と接触させることにより硝酸にまで酸化するが、本法においては亜硝酸酸化細菌を排除、もしくは不活化することによりアンモニウムイオンを亜硝酸イオンにまで酸化した時点で酸化を止める。 Regarding wastewater treatment using the ANAMMOX reaction, control of the nitritation reaction in the previous stage is an important point. In normal nitrification reaction, as mentioned above, it is oxidized to nitric acid by contacting with ammonia-oxidizing bacteria and nitrite-oxidizing bacteria. In this method, ammonium ions are eliminated by eliminating or inactivating nitrite-oxidizing bacteria. Oxidation is stopped when it is oxidized to nitrite ion.
これらのアンモニア酸化細菌と亜硝酸酸化細菌は、生育の環境条件が非常に似通っており、アンモニア酸化細菌のみを成育させることは容易ではない。また、長期の運転により、亜硝酸型の硝化が崩壊して硝酸型の反応が卓越する場合もあり、運転の安定性という点で問題を有する。さらに、ANAMMOX反応を良好に行うためにはアンモニウムイオンと亜硝酸イオンの濃度をほぼ１：１あるいは１：１以上に制御する必要があり、非常に高度な制御が必要となる。このように生物化学的にアンモニア性窒素を亜硝酸イオンに酸化してANAMMOX反応に供する手法は、コスト的には優位であるものの、安定運転という点では問題が残されている。 These ammonia-oxidizing bacteria and nitrite-oxidizing bacteria have very similar environmental conditions for growth, and it is not easy to grow only ammonia-oxidizing bacteria. In addition, nitrite-type nitrification may be disrupted by long-term operation, and nitric acid-type reactions may be prevalent, which is problematic in terms of operational stability. Furthermore, in order to carry out the ANAMMOX reaction satisfactorily, it is necessary to control the concentration of ammonium ions and nitrite ions to be approximately 1: 1 or 1: 1 or more, and very high control is required. Although the method of biochemically oxidizing ammonia nitrogen to nitrite ion and using it for the ANAMMOX reaction is advantageous in terms of cost, there is still a problem in terms of stable operation.
そこで本発明の課題は、ANAMMOX反応を安定して行わせ、目標とする脱窒処理を確実にかつ円滑に行うことができる、アンモニウムイオン含有排水の処理方法および装置を提供することにある。 Accordingly, an object of the present invention is to provide a method and apparatus for treating ammonium ion-containing wastewater that can stably perform an ANAMMOX reaction and reliably and smoothly perform a denitrification treatment.
上記課題を解決するために、本発明に係るアンモニウムイオン含有排水の処理方法は、アンモニウムイオンを含有する排水に亜硝酸イオンを添加して、嫌気性条件下で独立栄養性細菌と接触させることによりアンモニウムイオンを電子供与体とし、亜硝酸イオンを電子受容体として脱窒反応を行う処理方法であって、被処理水、反応槽内、処理水の少なくとも一箇所において窒素化合物濃度を測定し、その測定結果に基づき亜硝酸イオンの添加量を制御することを特徴とする方法からなる。 In order to solve the above-mentioned problems, the method for treating ammonium ion-containing wastewater according to the present invention comprises adding nitrite ions to wastewater containing ammonium ions and bringing them into contact with autotrophic bacteria under anaerobic conditions. A treatment method in which ammonium ion is used as an electron donor and nitrite ion is used as an electron acceptor to perform a denitrification reaction, and the concentration of nitrogen compounds is measured in at least one place of treated water, in a reaction tank, and treated water, It consists of the method characterized by controlling the addition amount of nitrite ion based on a measurement result.
この処理方法においては、上記窒素化合物が少なくとも全窒素、アンモニウムイオン、亜硝酸イオン、硝酸イオンのいずれかを含むことが好ましい。 In this treatment method, it is preferable that the nitrogen compound contains at least one of total nitrogen, ammonium ion, nitrite ion, and nitrate ion.
また、上記添加量の制御においては、アンモニウムイオンと亜硝酸イオンの比が１：１以上、好ましくは１：１．５以上となるように亜硝酸イオンの添加量を制御することが望ましい。 In addition, in controlling the addition amount, it is desirable to control the addition amount of nitrite ions so that the ratio of ammonium ions to nitrite ions is 1: 1 or more, preferably 1: 1.5 or more.
本発明に係るアンモニウムイオン含有排水の処理装置は、アンモニウムイオンを含有する排水に亜硝酸イオンを添加して、嫌気性条件下で独立栄養性細菌と接触させることによりアンモニウムイオンを電子供与体とし、亜硝酸イオンを電子受容体として脱窒反応を行う処理装置であって、被処理水、反応槽内、処理水の少なくとも一箇所において窒素化合物濃度を測定する濃度測定手段と、その測定結果に基づき亜硝酸イオンの添加量を制御する添加量制御手段とを有することを特徴とするものからなる。 The treatment apparatus for ammonium ion-containing wastewater according to the present invention adds nitrite ions to wastewater containing ammonium ions, and makes ammonium ions an electron donor by contacting with autotrophic bacteria under anaerobic conditions, A treatment apparatus for performing a denitrification reaction using nitrite ions as an electron acceptor, based on a concentration measurement means for measuring a nitrogen compound concentration in at least one place of water to be treated, in a reaction tank, and treated water, And an addition amount control means for controlling the addition amount of nitrite ions.
この処理方法においては、上記窒素化合物が少なくとも全窒素、アンモニウムイオン、亜硝酸イオン、硝酸イオンのいずれかを含むことが好ましい。 In this treatment method, it is preferable that the nitrogen compound contains at least one of total nitrogen, ammonium ion, nitrite ion, and nitrate ion.
また、上記添加量制御手段は、アンモニウムイオンと亜硝酸イオンの比が１：１以上、好ましくは１：１．５以上となるように亜硝酸イオンの添加量を制御することが望ましい。 The addition amount control means preferably controls the addition amount of nitrite ions so that the ratio of ammonium ions to nitrite ions is 1: 1 or more, preferably 1: 1.5 or more.
このように本発明では、処理対象となる被処理水、反応槽内、処理水の少なくともいずれかに含まれる窒素化合物の濃度を測定し、その測定結果に応じてANAMMOX反応に必要な亜硝酸イオンのうち、一部または全部を外部より積極的に添加する。これにより、常に適量の亜硝酸イオンが確保されてANAMMOX反応が効率的に行われ、かつ安定的に運転を行うことが可能とる。 As described above, in the present invention, the concentration of nitrogen compounds contained in at least one of the water to be treated, the reaction tank, and the treated water is measured, and nitrite ions necessary for the ANAMMOX reaction are determined according to the measurement results. Of these, some or all are actively added from the outside. As a result, an appropriate amount of nitrite ions is always ensured, the ANAMMOX reaction is performed efficiently, and stable operation is possible.
本発明に係るアンモニウムイオン含有排水の処理方法および装置を用いることによって、ANAMMOX反応を利用した窒素処理システムを効率的かつ安定的に運転することができる。また、適切な制御を行うことにより、従来必要とされていたANAMMOX反応前段の亜硝酸化槽およびANAMMOX反応後に残存したアンモニウムイオンを硝化するための硝化槽を設置することなく処理を行うことも可能になり、装置設置スペースの大幅な削減がはかれる。 By using the ammonium ion-containing wastewater treatment method and apparatus according to the present invention, a nitrogen treatment system using the ANAMMOX reaction can be operated efficiently and stably. In addition, by performing appropriate control, it is possible to perform treatment without installing a nitrification tank in the previous stage of the ANAMMOX reaction and a nitrification tank for nitrifying the ammonium ions remaining after the ANAMMOX reaction. Therefore, the installation space for the apparatus can be greatly reduced.
以下に、本発明の望ましい実施の形態について詳細に説明する。
ANAMMOX反応は一般的に以下の式で表される。
1.0NH4 + ＋ 1.32NO2 - ＋ 0.066HCO3 - ＋ 0.13H+
→1.02N2＋ 0.26NO3- ＋ 0.066CH2O0.5N0.15＋ 2.03H2O
Hereinafter, preferred embodiments of the present invention will be described in detail.
ANAMMOX reaction is generally expressed by the following formula.
1.0NH 4 + + 1.32NO 2 - + 0.066HCO 3 - + 0.13H +
→ 1.02N 2 + 0.26NO 3- + 0.066CH 2 O 0.5 N 0.15 + 2.03H 2 O
ANAMMOX反応は上記のように、独立栄養性の菌群により無酸素条件下でアンモニア性窒素と亜硝酸性窒素とから窒素ガスを生成する反応であり、通常は原水中のアンモニア性窒素の一部を好気性条件下で独立栄養性細菌であるアンモニア酸化細菌と接触させて亜硝酸イオンにまで変換した後に、ANAMMOX反応に供される。 As described above, the ANAMMOX reaction is a reaction that produces nitrogen gas from ammonia nitrogen and nitrite nitrogen under anoxic conditions by an autotrophic fungus group, and usually a part of ammonia nitrogen in raw water Is converted to nitrite ion by contacting with ammonia-oxidizing bacteria, which are autotrophic bacteria under aerobic conditions, and then subjected to ANAMMOX reaction.
アンモニア性窒素を含有した排水は、ANAMMOX反応槽の流入前もしくは処理後に窒素化合物濃度を測定される。本発明においてはANAMMOX反応に必要な亜硝酸イオンの供給量を算出することが重要であるため、ここで測定される窒素化合物濃度はアンモニア性窒素濃度が最も望ましいが、全窒素濃度やその他の窒素濃度、またはその他の指標によりアンモニア性窒素濃度に換算できる場合には他の指標を用いることもできる。つまり、濃度測定を行う窒素化合物が、少なくとも全窒素、アンモニウムイオン、亜硝酸イオン、硝酸イオンのいずれかを含むものであれば測定可能である。 Wastewater containing ammoniacal nitrogen is measured for nitrogen compound concentration before or after inflow into the ANAMMOX reactor. In the present invention, since it is important to calculate the supply amount of nitrite ions required for the ANAMMOX reaction, the nitrogen compound concentration measured here is most preferably an ammonia nitrogen concentration, but the total nitrogen concentration and other nitrogen concentrations In the case where the ammonia nitrogen concentration can be converted by the concentration or other indicators, other indicators can be used. That is, measurement is possible if the nitrogen compound for which the concentration is measured includes at least any of total nitrogen, ammonium ion, nitrite ion, and nitrate ion.
具体的には、例えば、
（１）ANAMMOX反応槽流入前に窒素化合物の測定を行って制御する場合：
測定項目はアンモニア性窒素、全窒素、亜硝酸性窒素のうちから少なくとも２つ以上を選択する。ただし、原水流量が一定の場合にはアンモニア性窒素、全窒素のうちどちらかを測定することによって亜硝酸イオンの添加量を制御することが可能である。原水中に硝酸性窒素が流入してくる場合には、別途硝酸性窒素の測定を行うか、アンモニア性窒素および亜硝酸性窒素を測定して亜硝酸イオンの添加量を制御することが望ましい。また、亜硝酸イオンの添加においてはANAMMOX反応槽の前段に亜硝酸イオン混合槽を設置する方法が好適に使用できる。
Specifically, for example,
(1) When measuring and controlling nitrogen compounds before entering the ANAMMOX reactor:
As the measurement item, at least two or more are selected from ammonia nitrogen, total nitrogen, and nitrite nitrogen. However, when the raw water flow rate is constant, the amount of nitrite ion added can be controlled by measuring either ammonia nitrogen or total nitrogen. When nitrate nitrogen flows into the raw water, it is desirable to measure nitrate nitrogen separately or to control the amount of nitrite ions added by measuring ammonia nitrogen and nitrite nitrogen. In addition, in the addition of nitrite ions, a method in which a nitrite ion mixing tank is installed in front of the ANAMMOX reaction tank can be suitably used.
（２）ANAMMOX反応槽処理水中窒素化合物の測定を行って制御する場合：
測定項目はアンモニア性窒素、亜硝酸性窒素のうち少なくとも一方を選択する。この場合、亜硝酸イオンの添加量はアンモニア性窒素の濃度が一定の値以下、亜硝酸性窒素の値が一定の範囲、もしくは所定の濃度となるように制御される。
(2) When measuring and controlling nitrogen compounds in ANAMMOX reactor treated water:
As the measurement item, at least one of ammonia nitrogen and nitrite nitrogen is selected. In this case, the amount of nitrite ion added is controlled so that the concentration of ammonia nitrogen is not more than a certain value, and the value of nitrite nitrogen is within a certain range or a predetermined concentration.
亜硝酸の添加量は、アンモニウムイオンと亜硝酸イオンの比が１：１以上となるように前記の測定結果を元に制御される。ただし、亜硝酸イオンの不足によりANAMMOX処理水にアンモニア性窒素が残留するような条件で処理を行った場合、後段に硝化反応槽が必要となるため、亜硝酸イオンは、アンモニウムイオンと亜硝酸イオンの比は１：１．５以上となるように添加することがより望ましい。 The amount of nitrous acid added is controlled based on the measurement result so that the ratio of ammonium ion to nitrite ion is 1: 1 or more. However, if treatment is performed under conditions where ammonia nitrogen remains in ANAMMOX treated water due to lack of nitrite ions, a nitrification reaction tank is required in the latter stage, so nitrite ions are ammonium ions and nitrite ions. It is more desirable to add the ratio of 1: 1.5 or more.
窒素化合物濃度をANAMMOX反応槽内もしくはANAMMOX処理水で測定して亜硝酸イオンの注入量を制御する場合には、アンモニウムイオン、亜硝酸イオンの少なくともひとつを測定することが非常に有効である。この場合、アンモニウムイオンは所定の濃度以上とならないように（たとえば10mgN/L以下）、亜硝酸イオンの場合には所定の濃度以上となるように（たとえば10mg/Ｌ以上）亜硝酸イオンの添加量が制御される。 When the nitrogen compound concentration is measured in the ANAMMOX reactor or with ANAMMOX treated water to control the injection amount of nitrite ions, it is very effective to measure at least one of ammonium ions and nitrite ions. In this case, the amount of nitrite ion added so that the ammonium ion does not exceed the predetermined concentration (for example, 10 mgN / L or less), and in the case of nitrite ion, the concentration exceeds the predetermined concentration (for example, 10 mg / L or more). Is controlled.
いずれの場合においても、アンモニウムイオン含有排水のアンモニウムイオンはその一部を予め公知の方法により亜硝酸イオンに変換することはコストの点からも非常に有効な方法になる。この場合、前述のようにアンモニウムイオンと亜硝酸イオンの比を制御してANAMMOX反応に供するのは非常に煩雑な制御が必要となるため、本発明においては、生物処理における亜硝酸化を前述の反応式における理論比以下に制御し、不足分の亜硝酸イオンを上記の方法により制御することによって安定な運転を達成することが可能になる。 In any case, converting some of the ammonium ions in the ammonium ion-containing wastewater into nitrite ions by a known method in advance is a very effective method from the viewpoint of cost. In this case, as described above, it is necessary to control the ratio of ammonium ions and nitrite ions to be used for the ANAMMOX reaction. Therefore, in the present invention, nitritation in biological treatment is performed as described above. It is possible to achieve stable operation by controlling the reaction ratio below the theoretical ratio in the reaction formula and controlling the deficient nitrite ion by the above method.
以下に本発明を用いて行った実施例を示す。なお、この実施例は本発明の範囲を限定するものではない。 Examples carried out using the present invention are shown below. Note that this example does not limit the scope of the present invention.
実施例１
図１に示すような装置を用いた。図１において、１は被処理水としての処理対象原水を示しており、処理対象原水１が窒素化合物濃度測定槽２に送られ、次いでANAMMOX反応槽３に送られる。窒素化合物濃度測定槽２内には、アンモニウムイオン電極４が配置されており、測定された濃度対応信号が、シーケンサーおよびポンプコントローラー５にて処理され、測定した窒素化合物濃度に基づいて、亜硝酸ナトリウムタンク６中に貯留されていた亜硝酸ナトリウムが、亜硝酸ナトリウム添加ポンプ７により添加量を制御されつつ処理対象原水に添加される。ANAMMOX反応槽３でANAMMOX反応が行われ、処理水８が取り出される。
Example 1
An apparatus as shown in FIG. 1 was used. In FIG. 1,
本実施例においては、ANAMMOX反応槽３として、容量2Lの密閉可能な完全混合槽を用い、その中にANAMMOX活性を有する菌群を付着させた5mm角のポリエチレン製スポンジ担体を投入し、攪拌機を用いて攪拌しつつ下記表１の組成の原水を連続的に通水した。この際、原水水質の変動を考慮するため、原水中のアンモニア性窒素濃度は100〜200mgN/L の間で変動させ、流入水中のアンモニア性窒素濃度をイオン電極を用いて連続的に測定した。測定したデータを用いて亜硝酸ナトリウム添加ポンプをフィードバック制御し、アンモニウムイオン濃度と亜硝酸イオンの比が１：１．５になるように添加した。なお、槽内にpHセンサーを設置し、pHが7.5となるように二酸化炭素ガスの添加を行った。 In this example, as the ANAMMOX reaction tank 3, a 2 L sealable complete mixing tank was used, and a 5 mm square polyethylene sponge carrier to which a bacterial group having ANAMMOX activity was attached was placed therein, and a stirrer was used. The raw water having the composition shown in Table 1 below was continuously passed while stirring. At this time, in order to take into account fluctuations in the raw water quality, the ammoniacal nitrogen concentration in the raw water was varied between 100 and 200 mgN / L, and the ammoniacal nitrogen concentration in the influent water was continuously measured using an ion electrode. Using the measured data, the sodium nitrite addition pump was feedback-controlled so that the ratio of ammonium ion concentration to nitrite ion was 1: 1.5. A pH sensor was installed in the tank, and carbon dioxide gas was added so that the pH was 7.5.
原水および処理水中のアンモニア性窒素濃度、および亜硝酸比率は、図２に示すように推移した。その結果、流入原水中のアンモニア性窒素濃度の変動に対して適切に亜硝酸イオンの添加量が制御され、アンモニア性窒素の処理は安定して達成することができた。 The ammoniacal nitrogen concentration and the nitrous acid ratio in the raw water and treated water changed as shown in FIG. As a result, the amount of nitrite added was appropriately controlled with respect to fluctuations in the ammonia nitrogen concentration in the influent raw water, and the treatment of ammonia nitrogen could be achieved stably.
１ 処理対象原水
２ 窒素化合物測定槽
３ ANAMMOX反応槽
４ アンモニウムイオン電極
５ シーケンサーおよびポンプコントローラー
６ 亜硝酸ナトリウムタンク
７ 亜硝酸ナトリウム添加ポンプ
８ 処理水
1 Raw water to be treated 2 Nitrogen compound measuring tank 3 ANAMMOX reaction tank 4
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| JP2003039092A (en) * | 2001-07-30 | 2003-02-12 | Kurita Water Ind Ltd | Biological denitrification method |
| JP2005246135A (en) * | 2004-03-01 | 2005-09-15 | Kurita Water Ind Ltd | Biological nitrogen removal method |
| JP2006122874A (en) * | 2004-11-01 | 2006-05-18 | Hitachi Plant Eng & Constr Co Ltd | Method and apparatus for treating ammonia-containing liquid |
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| JP2003039092A (en) * | 2001-07-30 | 2003-02-12 | Kurita Water Ind Ltd | Biological denitrification method |
| JP2005246135A (en) * | 2004-03-01 | 2005-09-15 | Kurita Water Ind Ltd | Biological nitrogen removal method |
| JP2006122874A (en) * | 2004-11-01 | 2006-05-18 | Hitachi Plant Eng & Constr Co Ltd | Method and apparatus for treating ammonia-containing liquid |
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| JP2010017639A (en) * | 2008-07-10 | 2010-01-28 | Metawater Co Ltd | Organic raw water denitrification method by control of nitrite-type nitrification |
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