Abstract:Completely autotrophic nitrogen removal over nitrite (CANON) has been regarded as an efficient and economical process for nitrogen removal from wastewater. The CANON process was successfully developed in an CSTR (Continuous Stirred-Tank Reactor) which was fed with synthetic wastewater and operated at 30°C and mean DO 0.27mg/L. The experiment lasted for 120 days. Under high ammonium influent, the highest ammonium removal efficiency was 84.4% and the maximum ammonia removal rate was 0.42kg/(m3·d), the highest total nitrogen removal efficiency was 72.0% and the maximum removal rate was 0.35kg/(m3·d). Rising ammonium concentration (76.05~583.93mg/L) in the influent caused the increase of ammonium (2.66~167.52mg/L), and no accumulation of nitrite was found in the reactor. In order to indicate the contribution of nitrifiers to the nitrate production, the ratio of total nitrogen removal and the amount of nitrate generated (△TN/△NO3-) was used. According to the OUR test experiment,the rate of oxygen consumption of the ammonia-oxidizing bacteria was 169.46 mgO2/(gVSS·h) while the rate of nitrite-oxidizing bacteria was 39.63 mgO2/(gVSS·h). Sludge particle size on day 102 (86.36μm) increased by 60% than the size on day 30 (54.09μm). Sludge SEM analysis showed filamentous bacteria decreased while extracellular polymeric substances increased on surface of sludge sample. The experimental results proved that the system had a certain granulation capability, which was beneficial to the start-up and improvement of autotrophic nitrogen removal.
胡石, 甘一萍, 张树军, 韩晓宇, 张亮. 一体化全程自养脱氮(CANON)工艺的效能及污泥特性[J]. 中国环境科学, 2014, 34(1): 111-117.
HU Shi, GAN Yi-Ping, ZHANG Shu-Jun, HAN Xiao-Yu, ZHANG Liang. Performance and sludge characteristics of the CANON process. CHINA ENVIRONMENTAL SCIENCECE, 2014, 34(1): 111-117.