Olasanmi Ibukun O, Thring Ronald W
Environmental Science and Engineering, University of Northern British Columbia, Prince George, BC V2N 4Z9, Canada.
J Adv Res. 2019 Aug 1;21:79-90. doi: 10.1016/j.jare.2019.07.003. eCollection 2020 Jan.
Environmental pollution by petroleum hydrocarbons (PHCs) is a severe and widespread problem impacting human health and the environment. To combat this issue, innovative and sustainable treatment methods are required. This research study investigated rhamnolipid-enhanced washing of drill cuttings and petroleum-contaminated soil obtained from northeastern British Columbia in Canada. The efficiency of PHC reduction was analysed and quantified via a Gas Chromatography equipped with a Flame Ionization Detector. Optimum washing conditions for both drill cuttings and petroleum-contaminated soil were temperature of ∼23.5 °C (room temperature), rhamnolipid concentration of 500 mg/L, and a washing time of 30 min. The optimum stirring speed and solution-to-sample ratio for drill cuttings and petroleum-contaminated soil were 100 rpm; 1:1, and 200 rpm; 4:1 respectively. The maximum PHC reduction recorded for total petroleum hydrocarbon and PHC fractions - F2, F3 and F4 were 76.8%, 85.4%, 71.3% and 76.9% respectively for drill cuttings and 58.5%, 48.4%, 63.5% and 59.8% respectively for petroleum-contaminated soil. The results strongly suggest that soil washing is an effective step in the reduction of PHC and can be used as a first step in the treatment of drill cuttings and petroleum-contaminated soils.
石油烃（PHCs）造成的环境污染是一个严重且广泛存在的问题，影响着人类健康和环境。为应对这一问题，需要创新且可持续的处理方法。本研究调查了鼠李糖脂强化清洗从加拿大不列颠哥伦比亚省东北部获取的钻屑和石油污染土壤的效果。通过配备火焰离子化检测器的气相色谱仪分析并量化了石油烃减少的效率。钻屑和石油污染土壤的最佳清洗条件均为温度约23.5°C（室温）、鼠李糖脂浓度500mg/L以及清洗时间30分钟。钻屑和石油污染土壤的最佳搅拌速度和液固比分别为100rpm；1:1和200rpm；4:1。钻屑中总石油烃和石油烃组分 - F2、F3和F4记录的最大石油烃减少率分别为76.8%、85.4%、71.3%和76.9%，石油污染土壤的相应减少率分别为58.5%、48.4%、63.5%和59.8%。结果有力地表明，土壤清洗是减少石油烃的有效步骤，可作为处理钻屑和石油污染土壤的第一步。
