Aquatic environment

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

  • Summary
  • References
  • Related Articles
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.

Copyright © Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V. and Science Press. All rights reserved.京ICP备05002858号-3