Effect of External Carbon Source on Denitrification in Biofilter at Low Temperature
The aim of this study is to investigate the denitrification efficiency enhancement and to evaluate the denitrification potential at the condition of lower temperature.Three identical biofilter were operated in parallel at batch tests.Results showed that the denitrification potential can be substantially increased by addition of ethanol and hydrolysate of sludge as external carbon sources compared with raw sewage.The mean denitrification rates of ethanol and hydrolysate reached up to 0.058 and 0.08 mgN/(g MLVSSh),respectively,while that of raw sewage was only 0.041 mgN/(g MLVSS·h).The denitrification potential increased respectively from 0.76 to 1.54 and 5.3 mg NO3-N/L owing to ethanol and hydrolysate addition.By comparison,hydrolysate of sludge was found to be the better carbon source for denitrification considering strengthening denitrification performance and price.This study provides evidence for external carbon sources choice of sewage plant and surplus sludge reutilization.
external carbon addition denitrification denitrification potential denitrification rate surplus sludge
HAN Hong-Jun LI Yu-Fei HU Hong-Bo WANG Bing
State Key Laboratory of Urban Water Resources and Environment (SKLUWRE),Harbin Institute of Technolo State Key Laboratory of Urban Water Resources and Environment (SKLUWRE),Harbin Institute of Technolo
国际会议
哈尔滨
英文
1358-1362
2010-07-24（万方平台首次上网日期，不代表论文的发表时间）