准好氧填埋场渗滤液重金属变化特性

为提高渗滤液中重金属的去除率,进行了模拟准好氧填埋场中试试验,分别对渗滤液pH值、氨氮和溶解氧等对准好氧填埋场渗滤液重金属变化特性的影响进行了研究.结果表明,渗滤液pH值和溶解氧等对重金属在填埋场中的迁移转化起重要作用.pH值较低时,渗滤液中重金属的浓度普遍较大;溶解氧对重金属浓度的影响取决于重金属在垃圾体中的存在形态;渗滤液中的Cr,N i和Pb在经过250 d准好氧填埋后,去除率分别达到76.5%,94.3%和91.4%.

Characteristics of Heavy Metals in Semi-aerobic Landfill Leachate

To raise the removal rates of heavy metals in leachate,pilot-scale expedments of semi-aerobic landfill were carried out,the factors influencing the characteristics of heavy metals in semi-aerobic landfill leachate,such as pH value,ammonia nitrogen and dissolved oxygen(DO),were investigated.The results show that pH value and DO play an important role in the attenuation of heavy metals.When pH value is small,the concentration of heavy metals is great.The influence of DO is decided mainly by the states of heavy metals in waste.After 250 d,the removal rates of Cr,Ni and Pb are 76.5%.94.3%and 91.4%respectively.