pH值对短程反硝化及N_2O释放特性影响
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摘要
以普通活性污泥为种泥,控制COD/N为2,通过逐步提升NO_2~--N浓度(由15上升至200mg/L)的方式在小试SBR反应器中实现了短程反硝化的启动;稳定运行期间,NO_2~--N的平均去除率达99.5%.在此基础上,通过批式试验考察了不同进水pH值(7.1、8.2和9.3)对短程反硝化及N_2O释放特性的影响.结果表明,随着进水pH值的升高,平均反硝化速率由0.087 9上升至0.094 1和0.107 2 mg/(min·gSS);反硝化效率先降后升,分别为98.70、96.52和99.10%;而N_2O的释放量随pH值升高呈降低的趋势,pH值为7.1时的释放量分别是8.2和9.3时的2.82和8.04倍.因此,适当提升进水pH值可大幅降低短程反硝化过程N_2O的释放量.
Shortcut denitrification was successfully started up in a sequencing batch reactor(SBR) by evaluating nitrite nitrogen concentration from 15 to 200 mg/L. Batch experiments were conducted to investigate the effect of pH values(7.1, 8.2 and 9.3) on the denitrification rate and nitrous oxide(N_2O) emission. The results show that the nitrite removal rate increased from 0.087 9 to 0.094 1 and 0.107 2 mg/(min·gSS), and then decreased with the increase of pH. While the removal efficiency of nitrite firstly decrease from 98.70 to 96.52 and then increased to 99.10%. The amount of N_2O emission decreased with the increase of pH values, and the N_2O emission amount at pH 7.1 was 7.04 times more than that at pH 9.3. The results demonstrated that the N_2O emission can be decreased significantly by increasing the influent pH value during shortcut denitrification.
Shortcut denitrification was successfully started up in a sequencing batch reactor(SBR) by evaluating nitrite nitrogen concentration from 15 to 200 mg/L. Batch experiments were conducted to investigate the effect of pH values(7.1, 8.2 and 9.3) on the denitrification rate and nitrous oxide(N_2O) emission. The results show that the nitrite removal rate increased from 0.087 9 to 0.094 1 and 0.107 2 mg/(min·gSS), and then decreased with the increase of pH. While the removal efficiency of nitrite firstly decrease from 98.70 to 96.52 and then increased to 99.10%. The amount of N_2O emission decreased with the increase of pH values, and the N_2O emission amount at pH 7.1 was 7.04 times more than that at pH 9.3. The results demonstrated that the N_2O emission can be decreased significantly by increasing the influent pH value during shortcut denitrification.
引文
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[3]LYongtao,JU Kai,WANG Lei,et al.Effect of pHon nitrous oxide production and emissions from a partial nitritation reactor under oxygen-limited conditions[J].Process Biochemistry,2016,51:765-771．
[4]KAMPSCHREUR M J,TEMMINK H,KLEEREBEZEMR,et al.Nitrous oxide emission during wastewater treatment[J].Water Research,2009,43(17):4093-4103．
[5]李鹏章，王淑莹，彭永臻，等．COD/N与pH值对短程硝化反硝化过程中N2O产生的影响[J]．中国环境科学，2014,34(8):2003-2009.LI Pengzhang,WANG Shuying,PENG Yongzhen,et al.Effect of COD/N ratios and pH on N2O production during nitrite denitrification process[J].China Environmental Science,2014,34(8):2003-2009．
[6]袁林江，彭党聪，王志盈．短程硝化-反硝化生物脱氮[J]．中国给水排水，2000,16(2):29-31.YUAN Linjiang,PENG Dangcong,WANG Zhiying.Shortrange nitrification-denitrification of nitrifying organisms[J].China Water&Wastewater,2000,16(2):29-31．
[7]ADOUANI N,LENDORMI T,LIMOUSY L,et al.Effect of the carbon source on N2O emissions during biological denitrification[J].Resources,Conservation and Recycling,2010,54(5):299-302．
[8]ADOUANI N,LIMOUSY L,LENDORMI T,et al.N2O and NO emissions during wastewater denitrification step:Influence of temperature on the biological process[J].Comptes Rendus Chimie,2015,18(1):15-22．
[9]王心芳．水和废水监测分析方法[M]．北京：中国环境科学出版社，2002:258-284.WANG Xinfang.Determination methods for examination of water and wastewater[M].Beijing:China Environmental Science Press,2002:258-284．
[10]JU Kai,WANG Lei,LYongtao,et al.Nitrous oxide emission in autotrophic partial nitritation system:Macro-and microanalyses[J].Journal of Bioscience&Bioengineering,2015,120(4):419-425．
[11]KIMOCHY Y.Nitrogen removal and N2O emission in a full scale domestic waste water treatment plant with intermittent aeration[J].J.Ferment.Bioeng,1998,86:202-206．
[12]NI S Q,LEE P H,SUNG S.The kinetics of nitrogen removal and biogas production in an anammox nonwoven membrane reactor[J].Bioresour Technol,2010,101:5767-5773．
[13]BO G,FRETTE L,Westermann P.Dynamics of N2Oproduction from activated sludge[J].Water Research,1998,32(7):2113-2121．
[14]ZHOU Yan,PI J M,RAYMOND J,et al.Free nitrous acid inhibition on nitrous oxide Reduction by a denitrifying-enhanced biological phosphor removal sludge[J].Environmental Science Technology,2008,42(22):8260-8265.