非平衡吸附条件下双分子反应性溶质运移规律研究  

Migration of bimolecular reactive solutes considering nonequilibrium sorption

作　　者：王浩越 陈宏信 冯世进[1,2] 王文韬 WANG Haoyue;CHEN Hongxin;FENG Shijin;WANG Wentao(Department of Geotechnical Engineering,Tongji University,Shanghai 200092,China;Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education,Shanghai 200092,China)

机构地区：[1]同济大学地下建筑与工程系,上海200092 [2]同济大学岩土及地下工程教育部重点实验室,上海200092

出　　处：《岩土工程学报》2023年第12期2547-2555,共9页Chinese Journal of Geotechnical Engineering

基　　金：国家重点研发计划项目(2020YFC1808103);国家自然科学基金项目(41725012,41931289,42077250,42277148);上海市青年科技启明星计划(22QA1409700)。

摘　　要：针对溶质非平衡吸附特征,建立了非平衡吸附条件下双分子反应性溶质一维运移模型,考虑了在对流、弥散、吸附(平衡和非平衡)、反应(氧化反应和自然需氧量反应)耦合作用下的溶质运移过程,选用COMSOL对模型进行数值求解。研究结果表明:①非平衡吸附条件下污染物去除的第一阶段为氧化反应主导的快速修复,第二阶段为非平衡吸附主导的慢速修复;②考虑非平衡吸附可以更加精准刻画污染物拖尾效应;③化学反应速率影响数k、平衡吸附比例影响数f以及非平衡吸附速率影响数a均对污染物的去除效率产生显著影响,且a的影响程度与平衡吸附占总吸附比例f相关,佩克莱数Pe影响较小;④在k,a,f较小且Pe较大的情况下,拖尾效应较为严重,必须考虑非平衡吸附。A one-dimensional transport model for bimolecular reactive solutes under nonequilibrium sorption is developed for the characteristics of solute nonequilibrium sorption.The transport process of bimolecular reactive solutes under advection,dispersion,sorption(equilibrium and nonequilibrium)and reaction(oxidation and natural oxygen demand)is considered,and the COMSOL Multiphysics is used to solve the model numerically.The most important results are as follows:(1)The first stage of pollutant removal under nonequilibrium sorption conditions is the rapid remediation dominated by oxidation reactions,and the second stage is the slow remediation dominated by nonequilibrium sorption.(2)Considering nonequilibrium sorption can describe the pollutant tailing more accurately.(3)The chemical reaction rate k,equilibrium sorption ratio f and nonequilibrium sorption rate a significantly influence the removal efficiency of pollutants,and the impact of a is related to the rate of equilibrium sorption to total sorption f.The effects of the Peclet number are less obvious.(4)In cases of small k,a,f and large Pe,the tailing effects are more serious,and nonequilibrium sorption must be considered.

关 键 词：非平衡吸附 两点模型 双分子反应 溶质运移 拖尾效应 

分 类 号：TU43[建筑科学—岩土工程]