冻融作用对垃圾填埋场防渗层性能的影响

Influences of the Freezing and Thawing Action on the Performance of Landfill Liners

建立系列模拟实验研究了冻融作用对垃圾填埋场防渗层防渗和去污性能的影响。实验结果表明:冻融作用对垃圾填埋场防渗层有一定的破坏作用,对渗透系数和污染物的去除能力均有重要影响;冻融前的渗透系数均低于国家标准(1.0×10-7 cm/s),冻融后防渗层的渗透系数增加2～6倍;防渗层对COD、Cl-和NH4+的去除率分别从冻融前的68.6%、31.6%和70.5%变为86.2%、18.2%和23.0%。

A series of simulated experiments were conducted to investigate the influences of the freezing and thawing action on the performance and pollutants removal efficiency of landfill liners.The experimental results indicated that the freezing and thawing action could destroy the landfill liners,and had adverse effects on the permeability and pollutants removal efficiency.The permeability of liners without the freezing and thawing action were lower than national standard（1.0×10-7 cm/s）.However,freezing and thawing process could make the permeability of landfill liners increase 2-6 times;the removal efficiency of COD,NH＋4 and Cl-varied from the initial 68.6%,31.6% and 70.5% to 86.2%,18.2% and 23%,respectively.