Enhanced nitrification and denitrification by means of backflow without sludge

Journal of Shanghai Normal University (Natural Sciences)

ZHOU Junqing¹  ZHU Xiaohui¹  WU Zhendong¹  LU Qinyuan¹  ZHANG Yongming¹ 

[1] School of Environmental and Geographical Sciences, Shanghai Normal University, Shanghai 200234, China;

关键词: nitrification;    denitrification;    anoxic/oxic (a/o);    backflow;    bioreactor;   

DOI  :  10.3969/J.ISSN.1000-5137.2020.04.012

来源: DOAJ

【 摘 要 】

Municipal wastewater treatments were mainly carried out by activated sludge currently, for which anoxic/oxic(A/O) was widely accepted to enhance nitrogen(N)removals.In this process, wastewater flows back and forth between A and O tanks together with sludge because there is not independent settled tank for A and O tanks.In this work, the conventional backflow was compared with a novel backflow technique without sludge to investigate if nitrification and denitrification could be enhanced, based on a patent "vertical baffled bioreactor"(VBBR) that could realize separation of sludge from wastewater easily. Experimental results showed that nitrification rate increased by 12%, and denitrification rate increased by 2.5 folds compared with the conventional process.The results lay a good theoretical and practical foundation for efficient denitrification in the future municipal wastewater treatment.

【 授权许可】

Unknown