Effect of salt concentration on membrane bioreactor (MBR) performances: Detailed organic characterization

详细信息    查看全文

• 作者：M.A.H. Johir ; S. Vigneswaran ; J. K ; asamy ; R. BenAim ; A. Grasmick
• 关键词：AOB ; Ammonia-oxidizing bacteria ; A2O ; Anaerobic/anoxic/oxic ; BOD ; Biological oxygen demand ; COD ; Chemical oxygen demand ; DGGE ; Denaturing gradient gel electrophoresis ; DO ; Dissolved oxygen ; DOC ; Dissolved organic carbon ; DON ; Dissolved organic nitrogen ; F
• 刊名：Desalination
• 出版年：2013
• 出版时间：1 August, 2013
• 年：2013
• 卷：322
• 期：Complete
• 页码：13-20
• 全文大小：644 K

文摘

The gradual increase of salt concentration (0 to 35 g-NaCl/L) on the performance of membrane bioreactor (MBR) was studied. The uptake rate of dissolved organic carbon and ammonia decreased from around 17.0 mg-DOC/g-MLVSS.d to 1.8 mg-DOC/g-MLVSS.d and from 8.2 mg-NH₄-N/g-MLVSS.d to 0 mg-NH₄-N/g-MLVSS.d respectively when salt concentration reached to 35 g-NaCl/L. Similarly the specific oxygen uptake rate (SOUR) reduced from 8 to 9 to around 0.3 mg-O₂/g-MLVSS.h. The removal of bio-polymers, humic acids, building blocks and low molecular weight neutral decreased with increase in salt concentration. The concentration of dissolved organic nitrogen (DON) in bio-polymer increased from 0.05 to 3.31 mg/L when the salt concentration reached to 35 g-NaCl/L. This study provides good information for understanding the effect of continuous increase of salt concentration in treating saline wastewater in a MBR process.