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Frontiers of Environmental Science & Engineering

ISSN 2095-2201

ISSN 2095-221X(Online)

CN 10-1013/X

Postal Subscription Code 80-973

2018 Impact Factor: 3.883

Front Envir Sci Eng Chin    2011, Vol. 5 Issue (4) : 604-609
Preliminary study of groundwater denitrification using a composite membrane bioreactor
Lihui ZHANG, Guomin CAO(), Yulei FEI, Hong DING, Mei SHENG, Yongdi LIU
Research Institute of Environmental Engineering, East China University of Science and Technology, Shanghai 200237, China
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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 NO3--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·m-2·h-1 for most of the 96-h cycles during the 30-cycle study. The effluent was essentially free of ethanol and nitrite nitrogen.

Keywords groundwater      nitrate      denitrification      composite membrane bioreactor (CMBR)      immobilized cell membrane     
Corresponding Authors: CAO Guomin,   
Issue Date: 05 December 2011
 Cite this article:   
Lihui ZHANG,Guomin CAO,Yulei FEI, et al. Preliminary study of groundwater denitrification using a composite membrane bioreactor[J]. Front Envir Sci Eng Chin, 2011, 5(4): 604-609.
Fig.1  Schematic diagram of the CMBR
Fig.2  Profiles of and concentrations in compartment 1 (a) and compartment 2 (b) of the CMBR
Fig.3  Effect of the ethanol solution concentration on the treatment effectiveness
Fig.4  Effect of the ethanol solution concentration on TOC profile of compartment 1
Fig.5  Effect of ethanol supplementation method on the treatment effectiveness
Fig.6  Effect of ethanol supplementation method on TOC profile of compartment 1
Fig.7  Long-term batch treatment performance of CMBR
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