Nitrogen removal and simultaneous nitrification and denitrification in a fluidized bed step-feed process.
For urban wastewater treatment, we conducted a novel four-stage step-feed wastewater treatment system combined with a fluidized bed laboratory experiment to investigate chemical oxygen demand (COD), NH(4+)-N, and total nitrogen (TN) removal performance. The removal rates of COD, NH(4+)-N and TN were 88.2%, 95.7%, and 86.4% with effluent concentrations of COD, NH(4+)-N and TN less than 50, 8, and 10 mg/L, respectively. Biomass and bacterial activities were also measured, with results showing more nitrobacteria in the activated sludge than in the biofilm; however, bacterial activity of the biofilm biomass and the activated sludge were similar. Nitrogen concentrations during the process were also detected, with simultaneous nitrification and denitrification found to be obvious.
State Key Laboratory of Urban Water Resources and Environment (SKLUWRE), Harbin Institute of Technology, Harbin 150090, China. wangbing8835829@163.com
Bing
B
Wang
Wei
W
Wang
Hongjun
H
Han
Hongbo
H
Hu
Haifeng
H
Zhuang
D018533:Biomass; D019149:Bioreactors / Q000382:microbiology; D058440:Denitrification; D005240:Feasibility Studies; D058465:Nitrification; D009584:Nitrogen / Q000302:isolation & purification*; D018505:Waste Management / Q000379:methods*
D009584:Nitrogen