文献类型：期刊文献

英文题名：Preliminary study of groundwater denitrification using a composite membrane bioreactor

作者：Zhang, Lihui[1];Cao, Guomin[1];Fei, Yulei[1];Ding, Hong[1];Sheng, Mei[1];Liu, Yongdi[1]

机构：[1]E China Univ Sci & Technol, Res Inst Environm Engn, Shanghai 200237, Peoples R China

年份：2011

卷号：5

期号：4

起止页码：604

外文期刊名：FRONTIERS OF ENVIRONMENTAL SCIENCE & ENGINEERING IN CHINA

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000297749600014)】；

基金：This research was supported by the Mega-projects of Science Research for Water Environment Improvement (No. 2008ZX07425001-04).

语种：英文

外文关键词：groundwater; nitrate; denitrification; composite membrane bioreactor (CMBR); immobilized cell membrane

摘要：A composite membrane bioreactor (CMBR) integrating the immobilized cell technique and the membrane separation technology was developed for groundwater denitrification. The CMBR had two well mixed compartments with one filled with the nitrate-containing influent and the other with a dilute ethanol solution; the compartments were separated by the composite membrane consisting of a microporous membrane facing the influent and an immobilized cell membrane facing the ethanol solution. Nitrate and ethanol molecules diffused from the respective compartments into the immobilized cell membrane where nitrate was reduced to gaseous nitrogen by the denitrifying bacteria present there with ethanol as the carbon source. The microporous membrane was attached to one side of the immobilized cell membrane for retention of the disaggregated bacteria. Relative to the single dose of external ethanol, the two-dose supplementation produced better treatment results as evidenced by the lower concentrations of NO (3) (-) -N and ethanol (as measured by total organic carbon) of the effluent. The batch treatment in CMBR removed most of the nitrate in the influent and attained a stable denitrification rate of 0.1 g center dot m(-2)center dot h(-1) for most of the 96-h cycles during the 30-cycle study. The effluent was essentially free of ethanol and nitrite nitrogen.