OAO水生蔬菜型人工湿地工艺对农村无序排放污水中氮磷的去除效果  

Effect of OAO Process by Aquatic Vegetable Constructed Wetland on Nitrogen and Phosphorus Removal for Unordered Discharge Sewage Treatment in Rural Villages

作　　者：陈太飞 韩群 翟志东 吴磊[1] 李先宁[1] 耿冰 Chen Taifei;Han Qun;Zhai Zhidong;Wu Lei;Li Xianning;Geng Bing(School of Energy and Environment,Southeast University,Nanjing 210096,China;Shanghai National Engineering Research Center of Urban Water Resources Co.,Ltd.,Shanghai 200082,China)

机构地区：[1]东南大学能源与环境学院,江苏南京210096 [2]上海城市水资源开发利用国家工程中心有限公司,上海200082

出　　处：《净水技术》2018年第11期120-128,共9页Water Purification Technology

基　　金：国家水体污染控制与治理科技重大专项(2012ZX07101-005)

摘　　要：为了考察OAO水生蔬菜型人工湿地对村落无序排放污水中氮磷的净化效果,户外自然条件下,采用人工模拟试验的方法,在不同水力负荷、进水浓度和C/N比及氮源形式的单因素影响条件下,对湿地进出水中氮磷浓度进行监测。试验结果表明:当水力负荷从0. 1 m^3/(m^2·d)提高到0. 5 m^3/(m^2·d)时,氮磷的去除率呈下降趋势,去除负荷先升高后降低。综合考虑,选取该湿地最佳水力负荷为0. 3 m^3/(m^2·d),此时氨氮、硝态氮、总氮和总磷的去除率分别为70. 17%、88. 48%、69. 13%和75. 33%,相应的去除负荷分别为1. 22、0. 52、1. 5 g/(m^2·d)和0. 098 g/(m^2·d)。在一定的浓度范围内,氨氮、硝态氮、总氮和总磷的去除率随着进水浓度的增加而增加,当超过一定的浓度后,去除率会趋于稳定甚至有所下降。当进水中的C/N由2增加到8时,总氮去除率由35%提高到65%;而当C/N由8增加到20时,总氮去除率仅由65%提高到80%,增加幅度相对较小。当进水中的硝氮比例增加时,总氮的去除率较高。冬季时,湿地对氮磷的去除率有所降低,氮的去除效果降低明显,对磷的去除影响较小。In order to study the effect of OAO process by aquatic vegetable constructed wetland, on nitrogen and phosphorus removal for unordered discharge sewage treatment in rural villages, the method of artificial simulation experiments was applied to study different hydraulic loads, influent concentration, C/N and nitrogen sources, under the outdoor natural conditions. Nitrogen and phosphorus concentrations in the inflow and outflow of wetland were monitored. The results showed when hydraulic load increased from 0. 1 m^3/（ m^2· d） to 0. 5 m^3/（ m^2·d） , removal rates of nitrogen and phosphorus decreased. The removal load increased first and then decreased. Considering comprehensively, optimal hydraulic load of the wetland was 0. 3 m^3/（ m^2·d） , and removal rates of NH3-N. NO3-N,TN and TP were 70. 17%,88.48%,69. 13% and 75.33%, corresponding removal loads were 1.22,0. 52,1.5 g/（m^2 ·d） and 0. 098 g/（ m^2· d）. In a certain concentration range, removal rates of NH3-N. NO3 -N,TN and TP increased with the increasing of influent concentration. When the concentration exceeded a eertain level, the removal rate tended to be stable or even declined. When C/N ratio in the ilffluent water increased from 2 to 8, TN removal rate increased from 35% to 65%. When C/N ratio increased from 8 to 20, TN removal rate only increased from 65% to 80%. The increase was relatively small. When the ratio of NO3-N in the water increased, the removal rate of TN was higher. In winter, removal rates of nitrogen and phosphorus in wetlands decreased, the removal efficiency of nitrogen decreased significantly, but the removal of phosphorus was not obvious.

关 键 词：好氧/厌氧/好氧工艺 水生蔬菜型人工湿地 水力负荷 进水浓度 碳氮比 氮磷去除率 

分 类 号：TU992.3[建筑科学—市政工程]