摘要
陕北是石油工业的发祥地,在石油大规模开采运输过程中,不可避免会造成石油的泄露倾洒,从而对土壤和地下水造成一定程度的污染。为了探讨陕北地区石油污染对土壤水分特性的影响,以3种不同土质土壤(塿土、黄绵土和风沙土)为研究对象,开展了3种土壤在4个不同污染梯度(0.5%、1%、2%和4%)下的土壤润湿性试验和饱和导水率实验,同时以清洁土壤作为对照。结果表明:当土壤受石油污染时,会引起其润湿性发生变化,产生一定程度的斥水性,该变化在风沙土上表现尤为明显;石油污染使3种土壤的饱和导水率均随着污染浓度的增大而呈现下降趋势,饱和导水率虽有降低,但是对于同一土质的土壤来说,均在一个数量级内。
Background, aim, and scope Northern Shaanxi is the birthplace of the oil industry. In the process of large-scale exploitation of oil, it will inevitably lead to leakage of oil spill, which causes a certain degree of pollution of soil and groundwater. In order to investigate the effect of oil pollution on soil water characteristics in northern Shaanxi, we conducted this study. Materials and methods In this study three different soils（Lou soil, Loessial soil and Aeolian sandy soil） were tested for soil wettability and saturated hydraulic conductivity at four different pollution gradients（0.5%, 1%, 2% and 4%）, with clean soil as a control. Results Soil moisture of Lou soil, Loessial soil and Aeolian sandy soil infiltrated quickly at 0% and 0.5% oil contaminated concentration, wetting grade 0, no water repellent. The Lou soil began to show slight water repellency at 4% oil treatment. Starting from 2% oil content, the water repellency of Loessial soil was enhanced. At 1% oil content, the Aeolian sandy soil exhibit strong water repellency and extreme water repellency at 4% oil content. The effect of oil pollution on soil wettability is： Aeolian sandy soil, Loessial soil and Lou soil. The oil pollution has a significant effect on the saturated hydraulic conductivity of the three soils. The saturated hydraulic conductivity of the Lou soil and Loessial soil was on the order of 10-5, the Aeolian sandy soil was on the order of 10-3. At the same pollution concentration, the saturated hydraulic conductivity of Loessial soil is larger than that of Lou soil. The effect of pollution concentration on the saturated hydraulic conductivity of three soils was significant at low oil content. With the increase of oil content, the trend of saturated hydraulic conductivity decreased gradually, and this effect was more significant in Aeolian sandy soil. Discussion Clean soil usually has a certain degree of hydrophilicity, but when the soil is contaminated by oil organic matter, the surface wettability may change from the hydroph
作者
魏样
蔡苗
朱坤
王启龙
WEI Yang;CAI Miao;ZHU Kun;WANG Qilong(Shaanxi Provincial Land Engineering Construction Group Co.Ltd.,Xi＇an 710075,China;College of Resources and Environment,Northwest A ＆ F University,Yangling 712100,China;Institute of Land Engineering ＆ Technology,Shaanxi Provincial Land Engineering Construction Group Co.Ltd.,Xi＇an 710075,China;Key Laboratory of Degraded and Unused Land Consolidation Engineering,Ministry of Land and Resources,Xi＇an 710075,China;Shaanxi Provincial Land Consolidation Engineering Technology Research Center,Xi＇an 710075,China)
出处
《地球环境学报》
CSCD
2018年第3期266-272,共7页
Journal of Earth Environment
基金
陕西省重点科技创新团队计划项目(2016KCT-23)~~
关键词
石油污染
土壤水分
土壤润湿性
饱和导水率
oil pollution
soil water
soil wettability
saturated hydraulic conductivity
