Bioreduction of nitrate and perchlorate from aqueous solution using hydrogen/carbon dioxide membrane aeration biofilm reactor
YANG Xiao-xiao, WANG Zuo-wei, XIA Si-qing
State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tong ji University, Shanghai 200092, China
Abstract：A hydrogen-based membrane aeration biofilm reactor (H2-MBfR) with carbon dioxide as the sole carbon source was applied for biodegradation of two typical oxidized pollutants (NO3--N and ClO4-) in simulative groundwater. In order to overcome the secondary pollution and high operation cost, CO2 was supplied through the membrane aeration as carbon source and to control the pH during denitrification. The experimental results showed that the reactor effluent pH can be controlled relatively stable through the adjustment of H2 and CO2 pressure. In first two opreation stages, the CO2 pressure was 0.05 MPa and 0.08 MPa, respectively, and the average influent concentrations of NO3--N and ClO4- were 20.73mg/L and 10.57mg/L, respectively, thus the average effluent pH was 8.45 and 8.06, respectively, and the removal rates of NO3--N and ClO4- were both higher than 95%; When the CO2 pressure increased to 0.12 MPa in the third stage, the average effluent pH was dropped to 6.93, and the average surface loadings of NO3--N and ClO4- surface have decreased significantly. And methanation was caused owing to excess CO2 under the condition of partial acid, which leads to the low reduction rates of goal pollutants. Therefore, reasonable control of the CO2 pressure was conducive to high efficiencies of NO3--N and ClO4- reduction.
杨潇潇, 汪作炜, 夏四清. 双膜曝气生物膜反应器除水中硝氮和高氯酸盐[J]. 中国环境科学, 2016, 36(10): 2972-2980.
YANG Xiao-xiao, WANG Zuo-wei, XIA Si-qing. Bioreduction of nitrate and perchlorate from aqueous solution using hydrogen/carbon dioxide membrane aeration biofilm reactor. CHINA ENVIRONMENTAL SCIENCECE, 2016, 36(10): 2972-2980.
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