[Study of CANON process start-up under aerobic conditions].
The start-up of CANON process was studied to reveal adaptability and how to condense time of start-up with a lab-scale experiment. During start-up stage, temperature was controlled at 35 degrees C +/- 1 degrees C, pH was 7.39-8.01 and free ammonium was 2.89-12.37 mg x L(-1). Partial nitritation was first built up in 60th day and kept steady, nitrite accumulation rate (NO2(-) -N/NO(x) (-) -N) was up to 98%. In the 160th day, the reactor started to show effects of anaerobic ammonium oxidation, and in the 210th day, CANON process was started-up under aerobic conditions successfully, and total nitrogen removal load was 1.22 kg/(m3 x d) and 70% removal rate on average was attained. When using ammonium wastewater without organic carbon sources as influent, there are two signs to indicate the CANON start-up: first, nitrogen gas was produced in carriers; the other one was the ratio of total nitrogen loss and increased nitrate keep steady, and in this study average ratio was 8.61 compared to theoretical value 8.
Fu
Kun-Ming
KM
Key Laboratory of Beijing Water Quality Science and Water Environment Recovery Engineering, College of Architecture and Civil Engineering, Beijing University of Technology, Beijing 100124, China. fukunming@yahoo.com.cn
Zhang
Jie
J
Cao
Xiang-Sheng
XS
Li
Dong
D
Meng
Xue-Zheng
XZ
Zhu
Zhao-Liang
ZL
D000332:Aerobiosis; D000641:Ammonia / Q000302:isolation & purification* / Q000378:metabolism; D019149:Bioreactors / Q000382:microbiology*; D052918:Environmental Restoration and Remediation / Q000379:methods*; D009570:Nitriles / Q000378:metabolism; D009584:Nitrogen / Q000302:isolation & purification* / Q000378:metabolism; D014865:Waste Disposal, Fluid / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000302:isolation & purification / Q000378:metabolism
D009570:Nitriles; D014874:Water Pollutants, Chemical; D000641:Ammonia; D009584:Nitrogen