摘要
氨氮是垃圾渗滤液中最具代表性的污染物之一,但其在土工合成黏土衬垫(GCL)中的扩散行为至今尚未得到重视。开展批式吸附试验和扩散试样浸提试验测定氨氮在GCL中的吸附分配系数;进行扩散试验测定氨氮在GCL中的扩散系数;基于试验得到的吸附分配系数和扩散系数,使用数值软件POLLUTE v7.0对氨氮在GCL中的运移行为进行模拟。试验结果表明,氨氮在膨润土上的吸附分配系数为0.017L/g,在GCL中的扩散系数约为9.0×10^(-11)m^(2)/s。POLLUTE v7.0的模拟结果显示,当考虑扩散存在时,氨氮将提前30 a击穿GCL。
Ammonium is a typical pollutant encountered in municipal solid waste landfill leachate.However,there have been no researches about the diffusion behavior of ammonium in a geosynthetic clay liner(GCL)until now.A series of batch adsorption tests and diffusion specimen leaching tests are conducted to measure the distribution coefficient of ammonium onto bentonite.In addition,the diffusion tests are conducted to estimate the diffusion coefficient of ammonium in the GCL.Both the adsorption and diffusion coefficients are used in the POLLUTE v7.0 to simulate the mass transfer of ammonium through the GCL.The test results show that the distribution coefficients of ammonium onto bentonite is 0.017 L/g,and the diffusion coefficient through the GCL is 9.0×10^(-11) m^(2)/s.The simulated results obtained by the POLLUTE v7.0 show that the ammonium will break through the GCL about 30 years earlier when the diffusion behavior is considered.
作者
王宝
王泽峰
窦桐桐
赵亚峰
葛碧洲
WANG Bao;WANG Ze-feng;DOU Tong-tong;ZHAO Ya-feng;GE Bi-zhou(School of Environmental&Municipal Engineering,Xi'an University of Architecture and Technology,Xi'an 710055,China;Shaanxi Key Laboratory of Geotechnical and Underground Space Engineering,Xi'an University of Architecture and Technology,Xi'an 710055,China;School of Civil Engineering,Xi'an University of Architecture and Technology,Xi'an 710055,China)
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2021年第1期140-146,共7页
Chinese Journal of Geotechnical Engineering
基金
国家自然科学基金青年基金项目(41602291)。
关键词
土工合成黏土衬垫
氨氮
扩散
吸附
geosynthetic clay liner
ammonium
diffusion
adsorption
