摘要
为研究潜流人工湿地处理农村生活污水的脱氮效果,实验采用氨氮浓度为20、30、40、50 mg.L-1的人工配置生活污水,通过实验室盆栽法研究7种典型水生植物风车草(Cyperus alternifolius)、花叶芦竹(Arundo donax var.)、再力花(Thalia dealbata)、东方香蒲(Typha orientalis Presl.)、千屈菜(Spiked Loosestrlfe)、黄花鸢尾(Iris pseudacorus)、梭鱼草(Pontederia cordata)的生长状况、发育规律以及对污水中氮的同化吸收作用,结合植物本身的形态指标,对处理农村生活污水的高效脱氮型潜流湿地的植被的脱氮效果进行综合评定。结果表明:植物在20 mg.L-1的处理中长势最好,各植物的形态指标随氨氮浓度的增加而递减;黄花鸢尾(Irispseudacorus)在NH3-N浓度50 mg.L-1以上的条件下不能生长,花叶芦竹(Arundo donax var.)在NH3-N浓度30 mg.L-1以上的条件下不能生长,梭鱼草(Pontederia cordata)在NH3-N浓度20 mg.L-1以上的条件下不能生长;植物脱氮效果随氨氮浓度的增加而递减。综合评定7种植物的脱氮效果,比较好的是再力花(Thalia dealbata)、东方香蒲(Typha orientalis Presl.)、风车草(Cyperus alternifolius)这3种植物。
To study the nitrogen removal efficiency of constructed wetlands for treatment of domestic wastewater,simulated wastewater with different concentration was used in this experiment.Seven plants which were Cyperus alternifolius,Arundo donax var.,Thalia dealbata,Typha orientalis Presl.,Spiked Loosestrlfe,Iris pseudacorus,Pontederia cordata were studied for the growth,and adsorption under the different concentration gradient.Ammonia was assimilated into amino acids when it was absorbed by plants,but if the ammonia concentration was too high,ammonia would accumulate in plants and inhibit the growth of plants,for the excessive ammonia in plants could inhibit the electron transport system in the process of plant respiration.The results showed that it was the best for plants growing at 20 mg·L-1 concentration.It was showed that higher ammonium concentration resulted in lower morphological indicators.The inhibiting nitrogen concentration for plant growth was different depending on plant species.The inhibiting concentrations of Iris pseudacorus,Arundo donax and Pontederia cordata were 50 mg·L-1,30 mg·L-1 and 20 mg·L-1 respectively.As increase of ammonia-nitrogen concentration,the effect of plant on nitrogen removal decreased.Thalia dealbata,Typha orientalis Presl.and Cyperus alternifolius were more effective in nitrogen removal in the 7 species of plants.
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2011年第5期993-1000,共8页
Journal of Agro-Environment Science
基金
国家自然科学基金(40871232)
国家科技支撑项目:城乡统筹生活污染控制和生态建设共性技术与综合示范(2009BADC2B04)
关键词
人工湿地
氨氮
植物筛选
脱氮效果
constructed wetland
ammonia-nitrogen
plant selection
denitrification
