环境工程学报2025，Vol.19Issue(4)：932-940,9.DOI:10.12030/j.cjee.202403168
石油烃污染物在黄土高原包气带土壤中的环境行为及其对地下水污染的风险
The environmental behavior of petroleum hydrocarbon pollutants in the vadose zone soils of the Loess Plateau and their risk of groundwater contamination
摘要
Abstract
During the oil extraction process,a potential risk of groundwater contamination caused by oil spills would be occurrence.In order to protect groundwater resources,based on the investigation of hydrogeology and soil physicochemical properties in an oil extraction field in northern Shaanxi of China,a water flow and solute transport model was constructed using the Hydras software to explore the environmental behavior of petroleum hydrocarbon pollutants in the unsaturated zone of the Loess Plateau and the risk of groundwater pollution.The results showed that when the fixed water level was 20 cm and continuous leakage of 100 mg·L-1 oily wastewater,the penetration period for petroleum pollutants to the silty soil layer(0～22.13 m soil layer)was 1 119 days,the periods for penetration the sandy soil layer(22.13～27.20 m)was 1 168 days,and the final concentration entering the groundwater is 52.79 mg·L-1.When the fixed water level was 50 cm,the period for petroleum pollutants to penetrate the silty soil layer and the sandy soil layer were 1 103 and 1 152 days,respectively.The petroleum concentration entering the groundwater was 53.24 mg·L-1.The initial penetration concentration of petroleum hydrocarbons into the aquifer was 0.01 mg·L-1,and the reduction coefficient of petroleum in the soil layer was 0.57 with a reduction rate of 42.53％～57.90％under continuous leakage condition.Under the scenario of rainfall evaporation,the peak concentration of petroleum entering the soil gradually moved downwards,and the petroleum content in the soil was less than 35.9 mg·kg-1 during 1 825 days of pollution.The petroleum pollutant was mainly trapped at a depth of 0～20 cm on the surface of silty loam soil that are difficult to pass through the aeration zone and enter groundwater.The Hydrus-1D model prediction results indicated that 100 mg·L-1 of oily wastewater posed a potential pollution risk to groundwater under continuous leakage conditions,while the groundwater pollution risk is relatively low under rainfall evaporation conditions in the Loess Plateau region.关键词
石油污染/地下水/Hydrus模型/定水头连续泄露/降雨蒸发Key words
oil pollution/groundwater/hydras model/fixed water level continuous leakage/rainfall evaporation分类
资源环境引用本文复制引用
严子浩,冯爽,吴蔓莉,高敬华,杨钊,徐会宁..石油烃污染物在黄土高原包气带土壤中的环境行为及其对地下水污染的风险[J].环境工程学报,2025,19(4):932-940,9.基金项目
国家自然科学基金资助项目(52070154) （52070154）
陕西省科技厅重点研发计划项目(2023-YBNY-251) （2023-YBNY-251）
