深床滤池用于污水厂二级出水极限脱氮中试研究  

作　　者：镇祥华 余琴芳 万年红 蔡世颜 程珊 李跃增 

机构地区：[1]中国市政工程中南设计研究总院有限公司

出　　处：《住宅产业》2019年第11期132-137,共6页Housing Industry

摘　　要：研究了污水处理厂二级出水采用深床滤池处理以使出水TN提升至地表Ⅳ类水水质的可行性。当中试系统进水TN、NH4+_N平均值为13.88mg/L、0.68mg/L,碳源(99%乙酸)投加量为60mg/L,空床水力停留时间为15min、30 min时,出水TN平均值、去除率分别为0.81mg/L、94.16%和0.74 mg/L、94.67%,反硝化滤池的平均容积负荷为0.64~1.28 kgNO^3--N/(m^3·d)。当进水TN平均值升高至18.05mg/L,NH4+_N平均值为1.40mg/L,碳源投加量为40mg/L时,同样运行条件下出水TN平均值、去除率分别为5.04mg/L、72.08%和2.36mg/L、86.93%。中试结果表明控制二级处理出水TN在一级A标准15mg/L、NH^4+_N在0.5mg/L以内,空床水力停留时间为30min,碳源投加量(C/N=4.5)足够,在此试验条件下深床滤池反硝化脱氮系统能稳定保证出水TN在地表Ⅳ类水水质1.5mg/L以内。The feasibility of improving TN in secondary effluent of sewage treatment plant to the surface water classⅣcriteria by deep-bed filter was studied.When the average TN and NH^4+-N concentrations in the influent of the pilot-scale system water are 13.88 mg/L and 0.68 mg/L,the carbon source(99%acetic acid)dosage is 60 mg/L,and the empty bed hydraulic retention time is 15 min and 30 min.The average TN concentration and removal rate of the effluent are 0.81 mg/L,94.16%and 0.74 mg/L,94.67%,respectively.The average denitrification volumetric loading rate is 0.64~1.28 kgNO^3--N/(m^3·d).When the average TN and NH^4+-N concentrations of influent increased to 18.05 mg/L and 1.40 mg/L,and the dosage of carbon source is 40 mg/L,the average TN concentration and removal rate of effluent under the same operation conditions were 5.04 mg/L,72.08% and 2.36 mg/L,86.93%,respectively.The results showed that the denitrification system of deep-bed filter can stabilize the effluent TN within 1.5 mg/L of the surface IV water quality by controlling the effluent TN of secondary treatment under the first level A criteria for municipal sewage of 15 mg/L,NH^4+-N of 0.5 mg/L,empty bed hydraulic retention time of 30 min and sufficient carbon(C/N=4.5)source dosage.

关 键 词：二级处理出水 深床滤池 超深度脱氮 Ⅳ类地表水标准 

分 类 号：X70[环境科学与工程—环境工程]