Nitrogen removal process in low C/N ratio wastewater treatment using a biofilm reactor coupled with embedded ferric tannate
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
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 1.38kg/(m3·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.
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LIU Chun, WANG Cong-cong, LIU Ying, ZHANG Rui-na, CHEN Xiao-xuan, ZHANG Jing, ZHANG Lei. Nitrogen removal process in low C/N ratio wastewater treatment using a biofilm reactor coupled with embedded ferric tannate. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(5): 1993-1999.
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