Sawaittayothin Variga, Polprasert Chongrak
School of Environment, Resources and Development, Asian Institute of Technology (AIT), PO Box 4, Klong Luang, Pathumthani 12120, Thailand.
Bioresour Technol. 2007 Feb;98(3):565-70. doi: 10.1016/j.biortech.2006.02.002. Epub 2006 Mar 20.
Experiments were conducted to investigate the feasibility of applying constructed wetlands to treat a sanitary landfill leachate containing high nitrogen and bacterial contents. Under a tropical condition (temperature of about 30 degrees C), the constructed wetland units operating at the hydraulic retention time of 8d yielded the best treatment efficiencies with BOD(5), TN and fecal coliforms removal of 91%, 96% and more than 99%, respectively. Cadmium removal in the SFCW bed was 99.7%. Mass balance analysis, based on total nitrogen contents of the plant biomass and dissolved oxygen and oxidation-reduction potential values, suggested that 88% of the input total nitrogen were uptaken by the plant biomass. Fluorescence in situ hybridization results revealed the predominance of bacteria, including heterotrophic and autotrophic, responsible for BOD(5) removal. Nitrifying bacteria was not present in the constructed wetland beds.
开展了实验以研究应用人工湿地处理含有高氮和高细菌含量的垃圾渗滤液的可行性。在热带条件下（温度约为30摄氏度），水力停留时间为8天运行的人工湿地单元产生了最佳处理效率，生化需氧量（BOD₅）、总氮和粪大肠菌群的去除率分别为91%、96%和超过99%。垂直潜流复合床（SFCW）中镉的去除率为99.7%。基于植物生物量的总氮含量以及溶解氧和氧化还原电位值的质量平衡分析表明，输入总氮的88%被植物生物量吸收。荧光原位杂交结果显示，负责去除BOD₅的细菌（包括异养菌和自养菌）占主导地位。人工湿地床中不存在硝化细菌。
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