Xu Zhen, Yang Zhao-Hui, Zeng Guang-Ming, Xu Zheng-Yong, Wang Rong-Juan, Sun Sai-Wu
College of Environmental Science and Engineering,Hunan University, Changsha 410082, China.
Huan Jing Ke Xue. 2008 Jul;29(7):1860-6.
At the high level of dissolved oxygen (DO) in sequencing batch biofilm reactor (SBBR), the approach and mechanism for realizing shortcut nitrification were researched. Landfill leachate was used as handling of object, the mainly environment parameters of the reactor were controlled as follow: DO 5 mg/L, pH 7.0, temperature 25 degrees C, adopted all drainage mode and 12-hour cycle influent. Through mathematical derivation and modeling analysis, determined free ammonia (FA), CO2 and HNO2 as the direct control factors, whereas the influent cycle time was the indirect one, shortcut nitrification was achieved effectively in SBBR. When the volume load of ammonia (NH4(+) -N) was 0.52 kg/(m3 x d) and NaHCO3 was 1.5 mg/L in the reactor, the shortcut nitrification effect was apparent as NH4(+) -N conversion rate was 89% and NO2(-) -N accumulation rate achieved 83% at the same time. With adequate oxygen supply, the key factors of achieving NO2(-) -N accumulation is FA concentration, and as the carbon source of ammonia-oxidizing bacteria, CO2 can upgrade the reactor performance further.
在序批式生物膜反应器（SBBR）中高溶解氧（DO）水平下，研究了实现短程硝化的途径和机制。以垃圾渗滤液为处理对象，将反应器的主要环境参数控制如下：溶解氧5mg/L，pH值7.0，温度25℃，采用全排水模式和12小时周期进水。通过数学推导和模型分析，确定游离氨（FA）、二氧化碳和亚硝酸为直接控制因素，而进水周期时间为间接控制因素，在SBBR中有效实现了短程硝化。当反应器中氨氮（NH4(+) -N）的体积负荷为0.52kg/(m3·d)且碳酸氢钠为1.5mg/L时，短程硝化效果明显，此时NH4(+) -N转化率为89%，NO2(-) -N积累率同时达到83%。在充足的氧气供应下，实现NO2(-) -N积累的关键因素是FA浓度，并且作为氨氧化细菌的碳源，二氧化碳可进一步提升反应器性能。
