LIUJing-miao,BIXue-jun,YANG Xin-ci,et al.Nitrogen Removal Performance of a Pilot?scale Pure Moving Bed Biofilm Reactor System at Low Temperature[J].China Water & Wastewater,2023,39(19):19-26.
Nitrogen Removal Performance of a Pilot?scale Pure Moving Bed Biofilm Reactor System at Low Temperature
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第39卷
Number:
第19期
Page:
19-26
Column:
Date of publication:
2023-10-01
- Keywords:
- moving bed biofilm reactor; low temperature; nitrogen removal; active biomass; microbial community structure
- Abstract:
- This study constructed a pilot?scale two-stage A/O coupled with pure moving bed biofilm reactor (MBBR) system to investigate its biological nitrogen removal performance at low temperature, and analyzed the effect of microbial community structure change on the biological nitrogen removal through molecular biology techniques, so as to solve the bottleneck problem of nitrification of traditional activated sludge at low temperature. When the reaction temperature was 10-12 ℃, the packing rates of the media in the anoxic and aerobic tanks were 40% and 50% respectively, and the volumetric loads of organic matter (SCOD) and ammonia nitrogen were (236.94±42.63) g/(m3·d) and (56.93±2.97) g/(m3·d), respectively, the removal rates of SCOD, NH4+-N and total inorganic nitrogen (TIN) were (71.20±4.64)%, (93.26±2.70)% and (62.30±2.41)%, and their concentrations in the effluent stabilized at (45.29±4.42) mg/L, (2.56±1.02) mg/L and (14.92±1.20) mg/L, respectively. The different properties and structures of available carbon sources led to significant differences in the denitrifying microbial community structure between the pre-anoxic reactor and post?anoxic reactor. Each of the aerobic reactors formed an obvious functional zone and corresponding biofilm structure. The maximum nitrification rate (measured by NH4+-N) on the surface of the packing media was 0.49-1.07 g/(m2·d), and the nitrification rate of each aerobic tank was positively correlated with the autotrophic active biomass and the relative abundance of nitrifying bacteria.
Last Update:
2023-10-01