游离氨对硝化过程的影响与定量表征  

Effect and quantitative characterization of free ammonia on nitrification process

作　　者：张彬 邓佳 陈杨武 孟丹 谭周亮[3,4] ZHANG Bin;DENG Jia;Chen Yangwu;MENG Dan;TAN Zhouliang(School of Civil Engineering and Construction and Environment of Xihua University,Chengdu 610039,China;School of Food and Biotechnology of Xihua University,Chengdu 610039,China;Key Laboratory of Environmental and Applied Microbiology,Chengdu Institute of Biology,Chinese Academy of Sciences,Chengdu 610041,China;Environmental Microbiology Key Laboratory of Sichuan Province,Chengdu Institute of Biology,Chinese Academy of Sciences,Chengdu 610041,China;School of Earth Sciences and Environmental Engineering of Southwest Jiaotong University,Chengdu 610039,China)

机构地区：[1]西华大学土木建筑与环境学院,成都610039 [2]西华大学食品与生物工程学院,成都610039 [3]中国科学院环境与应用微生物重点实验室,成都610041 [4]四川省环境微生物重点实验室,成都610041 [5]西南交通大学地球科学与环境工程学院,成都610039

出　　处：《应用与环境生物学报》2020年第5期1260-1267,共8页Chinese Journal of Applied and Environmental Biology

基　　金：中国科学院科技服务网络计划(STS计划)区域重点项目(KFJ-STS-QYZD-098);教育部春晖计划项目(191650[2018-93]);西华大学青年学者(2019);西华大学研究生创新基金项目(ycjj2018127)资助。

摘　　要：游离氨(FA)是影响微生物脱氮效果的关键因素之一,其浓度取决于NH4+-N浓度、pH值以及温度.为探究不同NH4+-N浓度、pH和温度条件下FA对整个硝化过程的影响,从NH4+-N浓度、pH值、温度3个方面分别考察硝化污泥在不同FA(2.9-170.2 mg/L)胁迫下,硝化菌群的比氨氧化速率(SAOR)、比NO3--N积累速率(SNaAR)、NO2--N积累率(NiAR)、代谢活性ATP响应情况,并建立底物抑制动力学模型.结果显示,不同NH4+-N浓度、pH、温度,SAOR、SNaAR、比ATP水平(SATP)受到抑制时对应的初始FA浓度不同,说明这3个影响因素对FA影响不同.皮尔森相关分析结果表明,SATP与SAOR、SNaAR密切相关,总体相关系数r大于0.8.Haldane抑制动力学模型适合描述FA对硝化细菌活性的抑制影响,NH4+-N浓度和pH的抑制常数分别为41.869、61.833 mg/L(氨氧化菌)和5.511、21.670 mg/L(亚硝酸盐氧化菌),其相关系数R2均大于0.92.本研究表明在NH4+-N浓度、pH、温度不同单因素条件下,FA对硝化细菌的抑制作用大小顺序为NH4+-N浓度>pH>温度;因此,在描述硝化细菌受FA抑制程度时指明NH4+-N浓度、pH、温度条件是有必要的;该结果可为不同因子作用下FA对硝化过程的抑制影响提供参考依据.(图3表7参40附图1)Free ammonia(FA) is one of the key factors affecting nitrogen removal in biological denitrification systems, and the concentration of FA depends on the comprehensive function of NH4+-N, pH, and temperature. This paper explored the effects of FA on the nitrification process under different NH4+-N concentrations, pH, and temperature conditions, respectively. In this paper, the specific ammonia-oxidizing rate(SAOR), the specific nitrate accumulating rate(SNaAR), the nitrite-accumulating ratio, and the ATP content of nitrifying bacteria under different FA concentrations(2.9-170.2 mg/L), which are influenced by NH4+-N concentration, pH value, and temperature respectively were investigated. Meanwhile, the substrate inhibition kinetics models were established. When ammonia concentration, pH, or temperature plays the role of the main driving factor, the initial FA concentrations corresponding to the inhibition effects on SAOR and SNaAR of nitrifying microorganisms were different, indicating that these three factors had varied effects on FA. A Pearson’s correlation analysis showed that the SATP level was closely related to SAOR, SNaAR(correlation coefficient R > 0.8). The Haldane inhibition kinetic model was suitable for describing the inhibitory effects of FA on the activity of nitrifying bacteria(R2 > 0.92). The inhibition constants of NH4+-N concentration and pH were 41.869 mg/L, 61.833 mg/L for ammonia-oxidizing bacteria, and 5.511 mg/L, 21.670 mg/L for nitrite-oxidizing bacteria, respectively. Concerning NH4+-N, pH, and temperature, the order of inhibition effects of FA on nitrifying microorganisms was NH4+-N concentration > pH > temperature. Therefore, it is necessary to specify the conditions of NH4+-N concentrations, pH, and temperature when describing the extent to which nitrifying bacteria are inhibited by FA.

关 键 词：游离氨 硝化细菌 比氨氧化速率 比硝氮积累速率 抑制动力学 

分 类 号：X703[环境科学与工程—环境工程]