摘要
针对传统的沸石湿地系统中沸石用量大,与沸石相关的费用高的缺点,提出采用前置沸石和表铺沸石填充方式来改善湿地中的污染物去除效果.对比研究了人工湿地中3种沸石填充方式(底铺、前置和表铺)对农田排灌水中污染物的去除效果.结果表明:茭白-土壤湿地的污染物去除效果优于无植物的土壤湿地系统.沸石-土壤-植物系统比传统的土壤-植物系统有更好的CODCr,总氮和氨氮去除效果.3种不同沸石填充方式中,底铺沸石的总氮和总磷去除效果最好;表铺沸石的总氮、总磷和CODCr去除效果比前置沸石的好,有植物和土壤的湿地系统增加前置沸石段后CODCr的去除率升高3.4%,增加表铺沸石后CODCr去除率提高12.3%.
Aimed at the defect of large consumption of zeolites in traditional zeolites filled wetland systems, top zeolite （TZ） mode and preposition zeolite （PZ） mode were put forward for the contaminants removal in constructed wetland. Three kinds of zeolites filled modes, including bottom zeolite （BZ）, TZ and PZ, were studied in constructed wetland for agricultural drainage and irrigation wastewater treatment. Constructed wetland including Zizania caduciflora and soil had better pollutant removal effect than the control system without helophyte. Constructed wetland with zeolite had better chemical oxygen demand （CODCr）, total nitrogen （TN） and total phosphorus （TP） removal rate than constructed wetland without zeolite. Among three kinds of zeolite filled modes, BZ mode system has best TN and TP removal rate, TZ system has better TN, TP and CODCr removal rate than PZ. CODCr removal rate increased 3.4% while PZ was added to the constructed wetland with hydrophyte and soil. CODCr removal rate increased 12.3% while TZ was added to the constructed wetland with hydrophyte and soil.
出处
《环境科学研究》
EI
CAS
CSCD
北大核心
2006年第3期91-95,共5页
Research of Environmental Sciences
基金
国家重大科技专项(K99-05-35-02)
