摘要
采用生物膜反应器耦合包埋型单宁酸铁处理低C/N比废水,考察其脱氮性能,分析了生物脱氮过程功能菌群的变化,以及单宁酸铁强化脱氮的作用机制.结果表明,生物膜反应器耦合包埋型单宁酸铁,具有低C/N比废水高效脱氮性能.进水C/N比为1:2.7时,TN平均去除率可达80.0%,TN平均去除负荷为1.38kg/(m^3·d).生物膜反应器内随着进水C/N比降低,优势脱氮过程从同步硝化-反硝化过程向同步短程硝化-厌氧氨氧化-反硝化(SNAD)过程转变,厌氧氨氧化过程对TN去除的贡献率逐渐升高至76.2%,亚硝化菌群和厌氧氨氧化菌群成为优势生物脱氮功能菌群.包埋型单宁酸铁在生化处理后,通过吸附-催化氨氧化作用同步去除氨氮和亚硝酸盐氮,进一步提高TN去除性能.因此,耦合单宁酸铁强化生物膜反应器SNAD脱氮过程,是实现低C/N比废水高效脱氮新的有效途径.
A biofilm reactor coupled with embedded ferric tannate was used to treat low C/N ratio wastewater and its nitrogen removal performance was investigated. The biological nitrogen removal process and the corresponding functional bacterial populations in the biofilm were also analyzed. The enhanced nitrogen removal by ferric tannate and its mechanism were also discussed. The results showed that the efficient nitrogen removal for low C/N ratio wastewater could be achieved in the biofilm reactor coupled with embedded ferric tannate. When the influent C/N ratio was 1:2.7, the average total nitrogen(TN) removal efficiency was 80.0%, and the average TN loading rate removed was 1.38 kg/(m^3·d). The dominant biological nitrogen removal process was converted from simultaneous nitrification-denitrification to simultaneous partial nitrification, ANAMMOX and denitrification(SNAD) process in the biofilm reactor when the influent C/N ratio decreased. As a result, the contribution of ANAMMOX process to TN removal increased up to 76.2% in the biofilm reactor. The populations of nitrosate bacteria and anammox bacteria became dominant for biological nitrogen removal. The ammonia nitrogen and nitrite nitrogen could be removed simultaneously by embedded ferric tannate due to the adsorption-catalytic ammonia oxidation process after biological treatment,resulting in further improvement of TN removal. Therefore, the enhancement of SNAD process by ferric tannate in a biofilm reactor is a new and effective solution for efficient nitrogen removal of low C/N ratio wastewater.
作者
刘春
王聪聪
刘颖
张瑞娜
陈晓轩
张静
张磊
LIU Chun;WANG Cong-cong;LIU Ying;ZHANG Rui-na;CHEN Xiao-xuan;ZHANG Jing;ZHANG Lei(Pollution Prevention Biotechnology Laboratory of Hebei Province,School of Environmental Science and Engineering,Hebei University of Science and Technology,Shijiazhuang 050018,China)
出处
《中国环境科学》
EI
CAS
CSCD
北大核心
2019年第5期1993-1999,共7页
China Environmental Science
基金
国家自然科学基金资助项目(51808186)
关键词
生物膜反应器
包埋型单宁酸铁
脱氮
SNAD过程
催化氨氧化
biofilm reactor
embedded ferric tannate
nitrogen removal
SNAD process
catalytic ammonia oxidation
