摘要
针对西北地区低C/N值城镇污水处理厂二级出水,采用两级A/O生物滤池与微絮凝过滤组合工艺强化脱氮除磷效果。结果表明,生物膜形成后,在溶解氧、水力负荷、流量分配比分别为4 mg/L、1.2 m^(3)/(m^(2)·h)、70%∶30%的条件下,该工艺对COD、NH_(4)^(+)-N的平均去除率分别为85%、94%,出水平均浓度分别为19.86、0.48 mg/L,达到《地表水环境质量标准》(GB 3838-2002)Ⅲ类水标准;对TP的去除率为75%,平均出水TP浓度为0.22 mg/L,达到Ⅳ类水标准;对TN的去除率为72%,平均出水TN浓度为6.77 mg/L,远低于《城镇污水处理厂污染物排放标准》(GB 18918-2002)一级A排放标准。组合工艺在保证COD去除效果的基础上实现了脱氮除磷。
A combined process of two-stage A/O biofilter and micro-flocculation filtration was applied to treat the secondary effluent with low C/N ratio from a municipal wastewater treatment plant in Northwest China, and the enhanced performance of nitrogen and phosphorus removal was investigated.After biofilm formation, when dissolved oxygen, hydraulic load and flow distribution ratio were 4 mg/L, 1.2 m^(3)/(m^(2)·h) and 70%∶30%, the average removal efficiencies of COD and NH_(4)^(+)-N were 85% and 94%,respectively, and their average concentrations in the effluent were 19.86 mg/L and 0.48 mg/L,respectively, which met the class Ⅲ criteria specified in Environmental Quality Standards for Surface Water(GB 3838-2002). The removal efficiency of TP was 75%, and its average concentration in the effluent was 0.22 mg/L, which met the class Ⅳ criteria specified in GB 3838-2002. The removal efficiency of TN was 72%, and its average concentration in the effluent was 6.77 mg/L, which was much lower than the first level A criteria specified in the Dischange Standard of Pollutants for Municipal Wastewater Treatment Plant(GB 18918-2002). The combined process not only achieved a good COD removal performance but also realized nitrogen and phosphorus removal.
作者
王宏伟
张国珍
武福平
马宏琛
闵芮
严婉铒
WANG Hong-wei;ZHANG Guo-zhen;WU Fu-ping;MA Hong-chen;MIN Rui;YAN Wan-er(School of Environmental and Municipal Engineering Lanzhou Jiaotong University Lanzhou 730070,China;Key Lxiboratory of Yellow River Water Environment in Gansu Province,Lanzhou 730070,China;Nanjing Metro Group Co.Ltd.,Nanjing 210008,China)
出处
《中国给水排水》
CAS
CSCD
北大核心
2022年第5期65-69,共5页
China Water & Wastewater
基金
国家自然科学基金资助项目(51768031)
甘肃省重点研发计划项目(17YF1NA056)。
关键词
两级A/O生物滤池
微絮凝
二级出水
低C/N值
脱氮除磷
two-stage A/O biofilter
micro-flocculation
secondary effluent
low carbonnitrogen ratio
nitrogen and phosphorus removal
