摘要
采用MUCT工艺处理低ρ(C)/ρ(N)比实际城市生活污水,研究在短程硝化稳定运行的基础上实现亚硝酸型同步硝化反硝化(simultaneous nitrification and denitrification,SND).反应器在(28±2)℃下运行177 d,试验结果表明:通过控制溶解氧(DO)质量浓度为0.3～0.6 mg/L、水力停留时间(HRT)为6 h实现了短程硝化,亚硝酸盐积累率(nitrite accumulation rate,NAR)达到90%以上,短程硝化反硝化稳定运行118 d.在短程硝化的基础上,好氧区低氧运行实现了亚硝酸型SND,通过亚硝酸型SND途径的总氮去除率平均33%,最高达到56%.亚硝酸型SND途径下氨氮、总氮、磷的去除率明显提高,无外加碳源时分别达到99%、83%和96%.因此,MUCT工艺实现亚硝酸型SND是低碳源污水处理的一种有效的运行方式,能充分利用原水中的有机碳源,总氮去除率的提高和碳源的节省保证了磷的去除效果.
Nutrients removal by simultaneous nitrification and denitrification （SND） via nitrite pathway was investigated in a lab-scale modified University of Cape Town （MUCT） process treating real domestic wastewater with low p （C）/p （N） ratio. The experimental results of 177 days at （28± 2） ℃ showed that nitritation was achieved when hydraulic retention time （HRT） was controlled at 6h and dissolved oxygen （DO） concentration was at 0.3 -0.6 mg/L. Nitritation was stably operated for 118 days with an average nitrite accumulation rate （NAR） of above 90%. Based on maintenance of nitritation, SND via nitrite pathway was achieved due to low DO operation at aerobic zone. An average removal efficiency of total nitrogen （TN） by SND via nitrite pathway was 33%, and the highest was up to 56%. Due to the operation of SND via nitrite pathway, the removal efficiencies of ammonia nitrogen, TN and phosphorus were improved and reached 99% , 83% and 96% , respectively, even though without addition of external carbon sources. Consequently, MUCT process with SND via nitrite pathway is an effective operation for the treatment of limiting carbon source wastewater. Under SND via nitrite pathway, the limiting carbon sources in raw wastewater can be fully utilized as well as the improved TN removal and savings of carbonsource favors the phosphorus removal.
出处
《北京工业大学学报》
CAS
CSCD
北大核心
2013年第5期754-760,共7页
Journal of Beijing University of Technology
基金
国家自然科学基金资助项目(51278007)
国家高技术研究发展计划资助项目(2012AA063406)
教育部新世纪优秀人才支持计划资助项目(NCET-11-0891)
关键词
短程硝化
亚硝酸型SND
MUCT工艺
生活污水
nitritation simultaneous nitrification and denitrification （SND） via nitrite pathway
modified University of Cape Town （MUCT） process
domestic wastewater
