低溶解氧环境下全程硝化活性污泥的特性  

The characteristic of activated sludge in nitrifying low-DO reactor

作　　者：高瑶远 彭永臻[1] 包鹏[1] 郭思宇[1] 王淑莹[1] GAO Yao-yuan;PENG Yong-zhen;BAO Peng;GUO Si-yu;WANG Shu-ying(National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Engineering Research Center of Beijing , Beijing University of Technology, Beijing 100124, China)

机构地区：[1]北京工业大学国家工程实验室,北京市污水脱氮除磷处理与过程控制工程技术研究中心,北京100124

出　　处：《中国环境科学》2017年第5期1769-1774,共6页China Environmental Science

基　　金：国家自然科学基金资助项目(51478013);北京市教委资助项目

摘　　要：为了了解低溶解氧下硝化活性污泥的特性以及相关微生物的种群结构,以人工配水模拟实际生活污水,在SBR反应器中,培养驯化低溶解氧硝化活性污泥,溶解氧浓度为0.3~0.5mg/L,成功驯化后检测其种群数量及结构并对其进行影响因素的分析.结果表明,低氧驯化的硝化活性污泥最适温度为25℃,最适pH值为8.5;在pH值为7.5,温度为20℃,溶解氧在0.5~4mg/L的条件下,比氨氧化速率和比亚硝氧化速率基本保持在0.3和0.6mg N/(mg MLSS×d)左右.通过高通量测序,低氧驯化的硝化反应器中主要亚硝酸氧化微生物为Nitrospira菌属,占总菌属的33%;主要氨氧化微生物为Nitrosomonas菌属,占总菌属的7%.The characteristics and microbial community of nitrifying bacteria cultivated at the low DO concentration of0.3~0.5mg/L in a sequencing batch reactor(SBR)was investigated in this study.The bacterial abundance and diversity were analysed with different influencing factors after successful cultivation of the active sludge.Results showed that,the optimum temperature for low-DO nitrifying bacteria was25℃,and the optimum pH was8.5.Under the condition of pH7.5at20℃,specific ammonia oxidate rate and specific nitrite oxidate rate were0.3and0.6mgN/(mgMLSS?d)with DO of0.5~4mg/L,respectively.High throughput sequencing analysis revealed that Nitrospira genus was the dominant nitrite oxidizing bacteria(NOB)accounting for33%of whole community,and Nitrosomonas was the major ammonium oxidizing bacteria(AOB)accounting for7%in the low-DO nitrification reactor.

关 键 词：低溶解氧 硝化细菌 温度 PH值 

分 类 号：X703.5[环境科学与工程—环境工程]