摘要
不设缺氧段,采用生物接触氧化池与生物流化床联合处理实际生活污水,研究溶解氧(DO)浓度对其脱氮效果的影响。实验分为Ⅰ、Ⅱ、Ⅲ3个阶段,3个阶段生物接触氧化池DO质量浓度分别设置为(1.5±0.4)、(2.8±0.6)、(4.6±0.8)mg/L,生物流化床曝气量基本不变。结果表明,3个阶段生物接触氧化池氨氮去除率随DO的升高而升高,但生物流化床中的氨氮浓度降低,不利于厌氧氨氧化反应的进行,并影响最终TN的去除效果,第Ⅰ、Ⅱ、Ⅲ阶段的整体TN去除率分别为73.7%±6.9%、72.0%±2.1%和51.4%±5.6%。可见,生物接触氧化池设置较低的DO既能提升脱氮效果,也能降低曝气能耗。
To study the effects of dissolved oxygen(DO)concentration on nitrogen removal,the method of biological contact oxidation tank combined with biological fluidized bed without anoxic phase to treat actual municipal wastewater was investigated.The experiment was divided into stageⅠ,ⅡandⅢ,and the DO concentrations in biological contact oxidation tank were controlled at(1.5±0.4),(2.8±0.6),and(4.6±0.8)mg/L,respectively,but the aeration rate in biological fluidized bed was basically unchanged.The results indicated that higher DO concentration resulted in higher ammonia nitrogen removal rate in biological contact oxidation tank,leading to less ammonia nitrogen flowing into subsequent biological fluidized bed,where the anaerobic ammonium oxidation was influenced and TN removal rate was affected.The overall TN removal rates of stageⅠ,ⅡandⅢwere 73.7%±6.9%,72.0%±2.1%,and 51.4%±5.6%,respectively.In conclusion,lower DO concentration in the biological contact oxidation tank could improve nitrogen removal and save energy simultaneously.
作者
许德超
朱婷婷
阳立平
张巧
尹雪
谢帮蜜
彭盛华
XU Dechao;ZHU Tingting;YANG Liping;ZHANG Qiao;YIN Xue;XIE Bangmi;PENG Shenghua(Shenzhen Academy of Environmental Sciences,State Environmental Protection Key Laboratory of Drinking Water Source Management and Technology(Shenzhen),Shenzhen Key Laboratory of Emerging Contaminants Detection&Control in Water Environment,Shenzhen Guangdong 518001)
出处
《环境污染与防治》
CAS
CSCD
北大核心
2020年第12期1557-1562,共6页
Environmental Pollution & Control
基金
深圳市科技计划应用示范项目(No.KJYY20170724165404571)。
关键词
溶解氧
生物接触氧化
生物流化床
脱氮
dissolved oxygen
biological contact oxidation
biological fluidized bed
nitrogen removal
