亚硝化SBR反应器快速启动过程的控制条件优化

INFLUENCING FACTORS OPTIMIZATION OF RAPID START-UP FOR A PARTIAL NITRIFICATION SBR REACTOR

以模拟城市生活污水为处理对象,采用SBR反应器,在低DO浓度条件下,成功快速启动了亚硝化反应工艺,并对启动过程中的影响因素及实现过程进行研究。反应过程中控制反应器主要参数:DO为0.5~0.7 mg/L,pH为7.2~7.5,温度30~33℃,曝气时间6 h,通过循序递增的氨氮浓度(35~85 mg/L)间歇交替进水,经过33天的稳定运行成功实现了亚硝化的快速启动并且实现亚硝态氮积累率90%以上。考察了SBR亚硝化启动过程的影响因素。研究结果表明,DO直接影响亚硝化进程,当DO平均浓度约为0.5 mg/L时,亚硝酸盐氧化菌的活性得到恢复;在SBR周期试验中,pH、DO浓度与短程硝化密切相关,可作为亚硝化过程的控制参数。

The rapid startup for nitrosation was achieved successfully at a low level concentration of DO in the sequencing batch reactor( SBR) with the research object of urban sewage. The Factors of startup for nitrosation and implementation process were obtained. The main parameters of the reactor were controlled as follows: DO was 0. 5g ~ 0. 7 mg /L,pH values kept from 7. 2 to7. 5,temperature maintained in 30 ~ 33 ℃,and aeration time was 6 hours. The rapid startup for nitrosation was realized successfully after 33 days stable operation by the intermittent alternating water with sequentially increasing ammonia concentration(35 ~85 mg/L) and the nitrosation accumulation rate was more than 90%. The effects of these factors on the control of SBR nitrosation were evaluated. The results showed that different concentrations of DO can directly affect the nitrification process. The activity of nitrite oxidizing bacteria( NOB) got recovered gradually when average DO was at about 0. 5 mg /L. The pH value and the concentration of DO can be selected as control parameters in the SBR cycle.