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低温下A2/O-BAF反硝化除磷脱氮特性
摘要点击 202  全文点击 76  投稿时间:2018-02-24  修订日期:2018-04-08
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中文关键词  低温  低C/N  曝气量  有效填料高度  反硝化除磷脱氮比例(ΔPO43-/ΔNO3--N)  曝气生物滤池
英文关键词  low temperature  low C/N  aeration flow  effective packing height  ratio of denitrifying phosphorus to nitrogen (ΔPO43-/ΔNO3--N)  biological aerated filter (BAF)
作者单位E-mail
黄剑明 兰州交通大学环境与市政工程学院, 兰州 730070 595303540@qq.com 
赵智超 兰州交通大学环境与市政工程学院, 兰州 730070  
郑隆举 兰州城市学院培黎机械工程学院, 兰州 730070  
邵兆伟 兰州交通大学环境与市政工程学院, 兰州 730070  
安芳娇 兰州交通大学环境与市政工程学院, 兰州 730070  
陈永志 兰州交通大学环境与市政工程学院, 兰州 730070 476411589@qq.com 
中文摘要
      在11~14℃低温下,采用A2/O-BAF系统处理低C/N生活污水,研究了污染物去除特性、反硝化除磷过程中除磷脱氮比例(ΔPO43-/ΔNO3--N)以及BAF中曝气量和有效填料高度对硝化反应的影响.结果表明,在COD、NH4+-N、TN和PO43-的平均进水浓度分别为193.1、58.6、60.3和5.1mg·L-1时,平均出水浓度分别为46.3、2.5、13.4和0.3mg·L-1,达到国家城镇污水处理厂污染物排放标准一级A标准.对ΔPO43-/ΔNO3--N进行线性拟合,比值分布在0.47~1.75之间;运用正态分布对ΔPO43-/ΔNO3--N进行数理统计,其均值为1.20,标准差0.29.BAF中曝气量为60 L·h-1和100 L·h-1,出水NH4+-N浓度小于5.0mg·L-1时所需填料高度分别为1.8 m和1.0 m;继续增大BAF中曝气量为120 L·h-1时,气水流冲击导致生物膜脱落,造成出水NH4+-N大于5.0mg·L-1.
英文摘要
      Low C/N domestic sewage was treated by an A2/O-biological aerated filter (BAF) system at low temperatures (11-14℃). The characteristics of pollutant removal, the ratio of denitrifying phosphorus to nitrogen (ΔPO43-/ΔNO3-N) and effects of aeration flow and effective packing height on nitrification in BAF were studied. The results showed that when the average influent concentrations of COD, NH4+-N, TN and PO43- were 193.1, 58.6, 60.3 and 5.1 mg·L-1 respectively, their effluent concentrations were 46.3, 2.5, 13.4 and 0.3 mg·L-1 respectively, which met the first level A criteria specified in the discharge standard of pollutants for municipal wastewater treatment plant (GB 18918-2002). The linear fitting of ΔPO43-/ΔNO3--N was between 0.47 and 1.75. The normal distribution of mathematical statistics was applied-and the average standard deviation for ΔPO43-/ΔNO3--N were 1.20 and 0.29 respectively. When the aeration flows were 60 L·h-1 and 100 L·h-1, the effluent concentration of NH4+-N was less than 5.0 mg·L-1, corresponding to the effective packing heights in the BAF of 1.8 m and 1.0 m respectively. However, when the aeration flow was increased to 120 L·h-1, the air-water flow led to biofilm detachment, which caused the effluent concentration of NH4+-N to increase beyond 5.0 mg·L-1.

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