山谷型填埋场渗滤液现场实验研究

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6mm/d、COD平均值为890mg/L、氨氮平均值为240mg/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。

In-site experimental study of leachate sub-surface irrigation in valley landfill

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.