以稳定渗滤液为处理对象,通过对其在山谷型填埋场覆盖层进行亚表面灌溉,研究了不同植被条件下植物的适应性、渗滤液水量削减负荷、COD和氨氮的去除率,以及灌溉对大气环境的影响.研究表明:夹竹桃是最适合进行渗滤液灌溉处理的植被；高羊茅作为草本植物,可作为夹竹桃的替代,也可与夹竹桃复种,形成双层植被；在渗滤液灌溉水力负荷为6 mm/d、COD平均值为890 mg/L、氨氮平均值为240 mg/L的情况下,各灌溉区灌溉水量可削减50％～80％,COD平均去除率在90％以上,氨氮平均去除率在96％以上.%The in-site experiment was conducted to irrigate the cover layer of valley landfill with leachate. The adaptability of different plants, the reduction rates of hydraulic loading, the removal rate of COD and NH3-N were monitored and the effect of leachate sub-surface irrigation on atmosphere was investigated. The results indicated that oleander was the favorite plant in sub-face irrigation! Tall fescue as a kind of herb could be applied as substitution of oleander or multiple planted with oleander to form the double-layer vegetation. Under the irrigation conditions of leachate hydraulic loading 6 mm/d, average COD concentration 890 mg/L and NH3-N concentration 240 mg/L, the reduction rates of leachate hydraulic loading achieved as high as 50%-80%,the COD and NH3-N removal rate was more than 90% and 96%, respectively.
展开▼
