摘要
为探究植物和水位对潮汐流人工湿地净化能力的影响,对无植物和不同水位运行的黄菖蒲湿地除污效果、污染物降解动力学和基质酶活性进行了研究。结果表明,黄菖蒲使总氮(TN)和总磷(TP)去除效果分别提高26.56个百分点和21.35个百分点,低水位使铵态氮(NH^(+)_(4)-N)去除效果提高12.77个百分点,饱和黄菖蒲湿地整体除污效果最佳,化学需氧(COD_(Cr))量、NH^(+)_(4)-N、TN和TP平均去除率分别为89.00%±2.68%、68.08%±2.90%、75.23%±2.81%和94.35%±1.18%。COD_(Cr)、NH^(+)_(4)-N和TP在淹没1 h内高效去除,无植物湿地淹没46 h后会发生磷解析,而TN去除需要较长的淹没时间。无植物湿地、半饱和及饱和黄菖蒲湿地脱氮限制路径分别为硝化作用、反硝化作用和硝化/反硝化协同作用。此外,不同基质酶对黄菖蒲和水位响应不同,黄菖蒲能提高脲酶和磷酸酶活性,这2种酶可作为湿地水质净化效果的评价指标,且脲酶对水位较为敏感。
To explore the effects of plants and water level on performance of tidal flow constructed wetland(TFCW)for wastewater treatment,the pollutant removal,contaminants degradation kinetics and substrate enzyme activities were studied under the presence of Iris pseudacorus and different water levels.The results demonstrated that the presence of I.pseudacorus increased total nitrogen(TN)and total phosphorus(TP)removal by 26.56 percentage point and 21.35 percentage point,respectively,while low water level showed 12.77 percentage point increase for ammonium nitrogen(NH^(+)_(4)-N)removal.The saturated TFCW planted I.pseudacorus showed the optimal performance,and the average removal rates of chemical oxygen demand(COD_(Cr)),NH^(+)_(4)-N,TN and TP were 89.00%±2.68%,68.08%±2.90%,75.23%±2.81%and 94.35%±1.18%,respectively.The majority of COD_(Cr),NH^(+)_(4)-N and TP could be decontaminated during one hour flooded time.It was found that the long flood could cause absorbed phosphorus in anaerobic environment return into wastewater,while it benefited TN degradation.The nitrogen removals in unplanted TFCW,unsaturated TFCW and saturated TFCW were mainly affected by microbial nitrification,denitrification and synergistic effect of nitrification/denitrification,respectively.In addition,there were different response of enzyme activities to I.pseudacorus and water level.The presence of I.pseudacorus can improve the activities of urease and phosphatases,and these two enzymes can be used as evaluation indicators for pollutant removal in constructed wetlands.The urease is found to be high sensitivity to water level.
作者
陈鸣
闫春妮
王瑶瑶
黄娟
CHEN Ming;YAN Chun-ni;WANG Yao-yao;HUANG Juan(Nanjing Research Institute of Environmental Protection,Nanjing 210013,China;Department of Municipal Engineering,School of Civil Engineering,Southeast University,Nanjing 210096,China)
出处
《江苏农业学报》
CSCD
北大核心
2021年第4期919-928,共10页
Jiangsu Journal of Agricultural Sciences
基金
国家自然科学基金项目(51479034)。
关键词
潮汐流人工湿地
黄菖蒲
水位
污染物降解
酶活性
tidal flow constructed wetland
Iris pseudacorus
water level
pollutant degradation
enzyme activities
