Simultaneous removal of COD and nitrogen using a novel carbon-membraneaerated biofilm reactor
HU Shaowei , YANG Fenglin , SUN Cui , ZHANG Jianye , WANG Tonghua
DOI:
Received April 09, 2007,Revised July 24, 2007, Accepted , Available online
Volume 20,2008,Pages 142-148
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A membrane aerated biofilm reactor is a promising technology for wastewater treatment. In this study, a carbon-membrane aerated
biofilm reactor (CMABR) has been developed, to remove carbon organics and nitrogen simultaneously from one reactor. The results
showed that CMABR has a high chemical oxygen demand (COD) and nitrogen removal e ciency, as it is operated with a hydraulic
retention time (HRT) of 20 h, and it also showed a perfect performance, even if the HRT was shortened to 12 h. In this period, the
removal e ciencies of COD, ammonia nitrogen (NH4
+-N), and total nitrogen (TN) reached 86%, 94%, and 84%, respectively. However,
the removal e ciencies of NH4
+-N and TN declined rapidly as the HRT was shortened to 8 h. This is because of the excessive growth
of biomass on the nonwoven fiber and very high organic loading rate. The fluorescence in situ hybridization (FISH) analysis indicated
that the ammonia oxidizing bacteria (AOB) were mainly distributed in the inner layer of the biofilm. The coexistence of AOB and
eubacteria in one biofilm can enhance the simultaneous removal of COD and nitrogen.
