基于J&E/AAM模型的污染场地VOCs风险防控

Q2 Environmental Science

环境科学研究 Pub Date : 2018-06-25 DOI:10.13198/j.issn.1001-6929.2018.01.03

逯雨, 李义连, 杨森, 朱艳, 李泉, 唐志

引用次数: 0

摘要

Volatile organic pollutants in soil or groundwater migrate into buildings through the aeration zone, leading to the accumulation of indoor pollutants and endangering human health. To study the process and influencing factors of site vapor invasion, using benzene as an example, a one-dimensional J&E analytical model and a two-dimensional approximate analytical AAM model were used to explore the influence of soil property parameters on the vapor attenuation coefficient and indoor vapor attenuation coefficient at the bottom plate of polluted site buildings, And analyze the applicable conditions of the two models. The results show that the indoor vapor concentration (Cin) depends on the vapor concentration (Cck) at the building floor and the rate of soil gas entering the room (Qck) Indoor vapor attenuation coefficient in the J&E model（ α Sin) decreases first and then increases as the depth of the foundation increases, while the indoor vapor attenuation coefficient in the AAM model has been showing an upward trend. The presence of capillaries reduces the vapor attenuation coefficient by 1-2 orders of magnitude, and soil moisture can also effectively block the upward diffusion of vapor. Under low permeability soil conditions, the indoor vapor attenuation coefficients calculated by both models are around 10-4; Under high permeability soil conditions, convection is strong at the building floor, and the vapor concentration at the building floor in the J&E model decreases. The indoor vapor attenuation coefficient is around 10-3, and the vapor concentration at the building floor in the AAM model is a constant value. The indoor vapor attenuation coefficient increases linearly with the change of soil permeability coefficient, and is 1-2 orders of magnitude higher than the results of the J&E model. Research shows that, When there is strong convective action at the bottom of buildings in polluted sites or in sandy or loamy soil, it is more reasonable to use the J&E model; In weak convection or in silt or clay, the AAM model can be used instead of the J&E model to simplify the calculation process and facilitate site risk assessment. Pollutant vapors have strong penetration in sandy soil, while clay layers can effectively block the migration of vapors. In actual site risk management, soil replacement or surface covering with clay can be used to block the migration of vapors

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基于J&E/AAM模型的污染场地VOCs风险防控

土壤或地下水中挥发性有机污染物经包气带迁移后进入建筑物，导致室内污染物聚集危害人体健康.为研究场地蒸气入侵的过程及影响因素，以苯为例，借助一维J&E解析模型和二维近似解析AAM模型，探究土壤性质参数对污染场地建筑物底板处蒸气衰减系数和室内蒸气衰减系数的影响，并分析两个模型的适用条件.结果表明，室内蒸气浓度（Cin）取决于建筑物底板处蒸气浓度（Cck）和土壤气体进入室内的速率（Qck）.J&E模型中，室内蒸气衰减系数（αsin）随着地基埋深增加先减后增，而AAM模型中室内蒸气衰减系数一直呈上升趋势.毛细管的存在使蒸气衰减系数降低1~2个数量级，土壤水分也可有效阻挡蒸气向上扩散.在低渗透土壤条件下，两个模型计算的室内蒸气衰减系数均在10-4左右；在高渗透土壤条件下，建筑物底板处对流作用强烈，J&E模型建筑物底板处蒸气浓度减小，室内蒸气衰减系数在10-3左右，AAM模型建筑物底板处蒸气浓度为定值，室内蒸气衰减系数随土壤渗透系数的变化大致呈线性增长，且比J&E模型结果高1~2个数量级.研究显示，当污染场地建筑物底部对流作用强烈或在砂土、壤土类土壤中，采用J&E模型更为合理；对流较弱或在粉土、黏土中，可以采用AAM模型代替J&E模型，简化计算过程，便于进行场地风险评估.污染物蒸气在砂土中穿透力较强，而黏土层可以有效阻挡蒸气的迁移，在实际场地风险管控中，可以采用换土或表层覆盖黏土的方法阻挡蒸气的迁移.

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来源期刊

环境科学研究 Environmental Science-Environmental Science (miscellaneous)

CiteScore

3.80

自引率

0.00%

发文量

6496

期刊介绍：