摘要
在低DO条件下对SBR反应器实现快速亚硝化的途径及影响因素进行研究.控制反应器主要参数为:DO 0.15～0.40mg/L,pH值7.52～8.30,温度22.3～27.1℃,曝气时间为8 h.通过高、低氨氮浓度(245.28 mg/L与58.08 mg/L)交替进水的方式,经过57个周期(36 d)的稳定运行成功实现了亚硝化的快速启动,亚硝化率高达100%,并考察了启动过程中亚硝酸盐氮积累的影响因素,分析了不同溶解氧浓度下SBR周期内DO和pH值的变化规律.结果表明,适当提高DO浓度可以提高亚硝化系统的运行效能,当平均DO>0.72 mg/L时,亚硝酸盐氧化菌开始恢复活性;FA浓度可作为控制亚硝化的关键因素,DO浓度则是亚硝化稳定运行的决定性因子.在SBR周期试验中,pH值可作为硝化反应结束的控制参数,而DO浓度在氨氮被降解完毕前快速升高,它不能很好地指示硝化反应的结束.
The approach and factors for realizing the rapid startup of nitrosation were researched at the low level of dissolved oxygen（DO） in sequencing batch reactor（SBR）.The main parameters of the reactor were controlled as follows： DO were 0.15-0.40 mg/L,pH values kept from 7.52 to 8.30,temperature maintained at 22.3-27.1℃,and time of aeration was 8 hours.The purpose of rapid startup for nitrosation was achieved after 57 cycles（36 d） with the alternative influent of high and low ammonium wastewater（the mean values were 245.28 mg/L and 58.08 mg/L respectively） in a SBR,and the nitrosation rate was even 100%.Factors of accumulation of nitrite were investigated and the effects of DO and pH were analyzed during the startup for nitrosation.The results showed that it could improve the efficiency of nitrosation when DO concentration was increased appropriately.The activity of nitrite oxidizing bacteria（NOB） was recovered gradually when DO was higher than 0.72 mg/L.The key factor of controlling nitrosation reaction was the concentration of free ammonia（FA）,while the final factor was the concentration of DO.pH was a desired controlling parameter to show the end of nitrification in a SBR cycle,while DO concentration did not indicate the finishing of SBR nitrification accurately because it increased rapidly before ammonia nitrogen was oxidized absolutely.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2011年第8期2317-2322,共6页
Environmental Science
基金
国家自然科学基金项目(50878003)
北京市自然科学基金项目(8092006)
城市水资源与水环境国家重点实验室开放基金项目(08UWQA08
QAK201005)
国家水体污染控制与治理科技重大专项(2008ZX07208-003-003
2008ZX07420-004-BJUT001
2008ZX07208-005-003)
北京工业大学第八届研究生科技基金项目(ykj-2010-3405
ykj-2010-3480
ykj-2010-3479)
关键词
SBR
亚硝化
PH
游离氨
溶解氧
sequencing batch reactor（SBR）
nitrosation
pH
free ammonia（FA）
dissolved oxygen（DO）
