[Implement of completely autotrophic nitrogen removal in EGSB reactor and its operation optimization].
An expanded granular sludge bed (EGSB) reactor inoculated simultaneously with aerobic ammonium oxidation sludge and anaerobic ammonium oxidation sludge were start-up to enrich completely autotrophic nitrogen removal granular sludge. Total nitrogen (TN) removal rate reached 0.101 kg x (m3 x d)(-1). Based on hypothesis of boundary layer, the transfer process between granular sludge and bulk liquid was modified, which was coupled with substance transfer process in granular sludge and aerobic ammonium oxidation, anaerobic ammonium oxidation, nitrite oxidation process, and completely autotrophic nitrogen removal model was found. The model was validated with the experimental results. According to simulation results, the operation of the reactor was optimized, TN removal efficiency and TN removal rate were increased from 52% to 61% and 0.103 kg x (m3 x d)(-1) to 0.114 kg x (m3 x d)(-1) respectively.
Ren
Hong-Yang
HY
Department of Environmental Science, Chongqing University, Chongqing 400030, China. yonkee1980@163.com
Zhang
Dai-Jun
DJ
Cong
Li-Ying
LY
D019149:Bioreactors / Q000382:microbiology*; D008962:Models, Theoretical; D009566:Nitrates / Q000737:chemistry / Q000378:metabolism; D009576:Nitrobacter / Q000378:metabolism; D009584:Nitrogen / Q000737:chemistry / Q000302:isolation & purification* / Q000378:metabolism; D009606:Nitrosomonas / Q000378:metabolism; D010084:Oxidation-Reduction; D000644:Quaternary Ammonium Compounds / Q000737:chemistry / Q000302:isolation & purification* / Q000378:metabolism; D014865:Waste Disposal, Fluid / Q000379:methods*
D009566:Nitrates; D000644:Quaternary Ammonium Compounds; D009584:Nitrogen