A hydrogen-based membrane biofilm reactor （MBfR） using H2 as electron donor was investigated to remove nitrate from groundwater. When nitrate was first introduced to the MBfR, denitrification took place on the shell...A hydrogen-based membrane biofilm reactor （MBfR） using H2 as electron donor was investigated to remove nitrate from groundwater. When nitrate was first introduced to the MBfR, denitrification took place on the shell side of the membranes immediately, and the effluent concentration of nitrate continuously decreased with 100% removal rate on day 45 under the influent nitrate concentration of 5 mg NO3^--N/L, which described the acclimating and enriching process of autohydrogenotrophic denitrification bacteria. A series of short-term experiments were applied to investigate the effects of hydrogen pressures and nitrate loadings on deniWification. The results showed that nitrate reduction rate improved as H2 pressure increasing, and over 97% of total nitrogen removal rate was achieved when the nitrate loading increased from 0.17 to 0.34 g NO3^--N/（m^2.day） without nitrite accumulation. The maximum deniwification rate was 384 g N/（m^3.day）. Partial sulfate reduction, which occurred in parallel to nitrate reduction, was inhibited by denitrififcation due to the competition for H2. This research showed that MBfR is effective for removing nitrate from the contaminated groundwater.展开更多
制备了蒽醌粒子电极,并采用复三维电极生物膜反应器进行生物反硝化反应。通过扫描电镜和红外光谱对粒子电极进行了表征。结果表明,蒽醌活性炭粒子电极结构紧密,内部具有微孔结构,有利于微生物生长;电极表面富含醌基官能团,可有效提高反...制备了蒽醌粒子电极,并采用复三维电极生物膜反应器进行生物反硝化反应。通过扫描电镜和红外光谱对粒子电极进行了表征。结果表明,蒽醌活性炭粒子电极结构紧密,内部具有微孔结构,有利于微生物生长;电极表面富含醌基官能团,可有效提高反硝化速率;复三维电极生物膜反应器具有良好的p H值缓冲能力,当p H值为8、进水流量为110 m L/h、外加电流为15 m A时,填充蒽醌粒子电极的反应器平均电流效率可达到128%,能效较高,且反硝化效果好,硝酸盐氮的去除率为61%,分别是商品活性炭电极反应器和空白粒子电极反应器的2.77和1.22倍。展开更多
基金supported by the National Natural Science Foundation of China (No.50978190)the National High Technology Research and Development Program (863) of China (No.2009AA062902)
文摘A hydrogen-based membrane biofilm reactor （MBfR） using H2 as electron donor was investigated to remove nitrate from groundwater. When nitrate was first introduced to the MBfR, denitrification took place on the shell side of the membranes immediately, and the effluent concentration of nitrate continuously decreased with 100% removal rate on day 45 under the influent nitrate concentration of 5 mg NO3^--N/L, which described the acclimating and enriching process of autohydrogenotrophic denitrification bacteria. A series of short-term experiments were applied to investigate the effects of hydrogen pressures and nitrate loadings on deniWification. The results showed that nitrate reduction rate improved as H2 pressure increasing, and over 97% of total nitrogen removal rate was achieved when the nitrate loading increased from 0.17 to 0.34 g NO3^--N/（m^2.day） without nitrite accumulation. The maximum deniwification rate was 384 g N/（m^3.day）. Partial sulfate reduction, which occurred in parallel to nitrate reduction, was inhibited by denitrififcation due to the competition for H2. This research showed that MBfR is effective for removing nitrate from the contaminated groundwater.
文摘制备了蒽醌粒子电极,并采用复三维电极生物膜反应器进行生物反硝化反应。通过扫描电镜和红外光谱对粒子电极进行了表征。结果表明,蒽醌活性炭粒子电极结构紧密,内部具有微孔结构,有利于微生物生长;电极表面富含醌基官能团,可有效提高反硝化速率;复三维电极生物膜反应器具有良好的p H值缓冲能力,当p H值为8、进水流量为110 m L/h、外加电流为15 m A时,填充蒽醌粒子电极的反应器平均电流效率可达到128%,能效较高,且反硝化效果好,硝酸盐氮的去除率为61%,分别是商品活性炭电极反应器和空白粒子电极反应器的2.77和1.22倍。
