反硝化过程中亚硝酸盐积累特性分析  

Analysis of Nitrite Accumulation During Denitrification

作　　者：葛士建[1] 王淑莹[1] 杨岸明[1,2] 彭永臻[1] 甘一萍[2] 曹旭[1] 

机构地区：[1]北京工业大学北京市水质科学与水环境恢复重点实验室,北京100124 [2]北京城市排水集团有限责任公司,北京100038

出　　处：《土木建筑与环境工程》2011年第1期140-146,共7页Journal of Civil,Architectural & Environment Engineering

基　　金："城市水资源与水环境国家重点实验室"开放基金项目(QAK201006);国家"十一.五"重大科技专项课题(2008ZX07317-007-105);北京工业大学第八届研究生科技基金(ykj-2010-3738)

摘　　要：在分段进水工艺处理城市废水实现深度脱氮(TN<5 mg.L-1)研究中,采用SBR反应器,分别以甲醇或葡萄糖为碳源研究了反硝化过程中亚硝酸盐(NO2--N)的积累情况、pH和ORP变化规律及动力学特性。结果表明,2种碳源系统、不同碳氮比(C/N)条件下反硝化过程均出现明显的NO2--N积累。相同C/N下,在NO2--N积累阶段,葡萄糖碳源系统的NO2--N积累浓度明显大于甲醇碳源,但2种碳源的NO3--N还原速率均大于NO2--N还原速率,且随C/N增加NO2--N的积累浓度逐渐增加,积累时间逐渐缩短。而高C/N下葡萄糖碳源的NO3--N还原速率及NO2--N积累浓度却呈现出下降的趋势。此外,pH和ORP变化规律可很好地表征反硝化过程中NO2--N积累的特征点,通过pH和ORP曲线的第2个拐点可指示反硝化过程的"真正"结束。To realize the purpose of enhanced nitrogen removal（TN5 mg·L-1） in step feed process treating urban wastewater,by using SBR reactor,the nitrite accumulation,variation of pH and ORP as well as dynamic properties during denitrification with methanol and glucose as the sole carbon sources are investigated in details.The results show that for both carbon sources,serious nitrite accumulations are observed during denitrification under different ratios of nitrogen and carbon（C/N）.With identical C/N,when glucose is used as carbon source there is more maximum NO2——N accumulation concentration.However,NO3——N reduction rate is faster than NO2——N reduction rate for both carbon sources.Furthermore,with the increase of C/N,the maximum NO2——N concentration increases and the time in which the NO2——N achieves the highest concentration is accordingly shortened.For glucose,however,under high C/N ratio（C/N=29.3） both the denitrification rate and NO2——N accumulation concentration decrease.Besides,the changes of pH and ORP reflect the variation of NO2——N accumulation concentration well because pH and ORP have the significant relationship with NO2——N concentration.The second inflexion on curves indicates the real end of denitrification process.

关 键 词：甲醇 葡萄糖 亚硝酸积累 反硝化 碳氮比 分段进水 

分 类 号：X703.1[环境科学与工程—环境工程]