摘要
基于稳态情形下的解析解,得到污染物浓度及渗流速度随时间变化的非稳态情形下的近似解,并与稳态情形下的计算结果进行验证分析.计算表明,随时间离散间距减小,所得近似解的精确度显著提高.算例分析表明,阻滞因子对污染物吸附量有较大影响,随解吸因子与吸附因子差值的增大,污染物的吸附量逐渐增大.例如,当吸附因子为1.7,解吸因子为1时,污染物吸附量可达到30%.而且,随吸附因子的增大,污染物穿透曲线的峰值减小,而峰值出现时刻也相应滞后.弥散度对吸附量的影响较小,但对污染物的穿透曲线形态有较大影响.随弥散度增大,污染物穿透过程延长,且污染物迁移过程主要受渗流速度影响.
A theoretical solution suitable for the variable concentration of contaminant and seepage velocity with time wasdeduced using an analytical solution for steady-state situation.The proposed model was verified by comparing with theanalytical solution in the case of steady state.Analytical results indicated that the calculation precision increases with thedecrease of the interval of discrete time.A typical case showed that retardation factor had an obvious influence on theadsorption effect of contaminant.For example,when absorption factor was1.7and desorption factor was1,the rate ofadsorbed contaminant within porous medium could reach30%.Moreover,the adsorption capacity of porous mediumincreased with the increase of the difference between adsorption factor and desorption factor.The peak value of thebreakthrough curve of contaminant decreased with the increase of adsorption factor,and its occurrence time was relativelylagged.The degree of dispersion had little effect on the adsorption capacity,but had an apparent influence on the shapes ofpenetration curves.
作者
郭志光
白冰
GUO Zhi-guang;BAI Bing(School of Civil Engineering, Beijing Jiaotong University, Beijing 100044,China)
出处
《中国环境科学》
EI
CAS
CSSCI
CSCD
北大核心
2017年第2期613-619,共7页
China Environmental Science
基金
国家自然科学基金资助项目(51678043
51478034)
关键词
污染物运移
非稳定流
非均衡吸附
多孔介质
迁移过程
transport of contaminant
unsteady flow
non-equilibrium adsorption
porous medium
migration process
