黄土高原地区石油类非点源污染试验研究

An Experimental Study on the Petroleum Pollutants?Runoff Pollution in the Loess Plateau of Northwest China

石油类非点源污染基本特征为污染源分散、污染源作用周期长、暴雨时易于形成高含沙水流以及由此引发的高强度石油类污染。试验结果表明,随土壤石油污染强度的提高,径流量增大,产沙量降低,但水、固两相中的污染物径流污染强度均增大。试验条件下,径流过程释放于水相中的石油类浓度可高达4～7 mg/L。

Sparse distribution of oil contaminated sites, long period effect of the pollution sources, easy formation of high sediment runoff and the followed high intensity of oil pollution are considered the basic characteristics of oil runoff pollution in Yanhe valley. Experimental results show that a higher oil load of petroleum contaminated soils results in a higher runoff volume and a higher intensity of oil runoff pollution, but a lower sediment runoff. Under the experimental conditions, oil concentration in water released from the contaminated sand can highly reach to 4～7mg/L during the runoff pollution.