| 摘要: |
| 如何妥善处理油基岩屑已成为制约页岩气绿色效益开发的关键瓶颈问题。采用油基岩屑热脱附处理后剩余固相替代矿粉制备沥青面层具有可行性,当剩余固相掺加量不高于4.8wt%时,制备出的沥青路面面层试块各项性能指标均符合《公路沥青路面施工技术规范》(JTG/T F40-2004)标准要求。采用GB/T 30810-2014和EANEN 7375方法,研究沥青面层试块中重金属的释放特性,结果表明沥青面层试块浸出液中11种重金属(砷、钡、钴、铜、铬、锰、钼、镍、铅、钒、锌)释放率均低于1%,其迁移污染地下水环境风险较低。沥青面层试块中各重金属释放机理具有差异,其中砷、铬的释放机理主要为溶解作用,钡、钴、锰、镍、铅的释放机理主要为表面冲刷,剩余重金属受到扩散作用控制,且各重金属释放速率呈现钡＜钴＜锌＜锰＜镍＜铬＜砷＜铅＜铜的规律。 |
| 关键词: 油基岩屑 脱油残渣 沥青面层 重金属 有效释放量 累计释放量 扩散系数 释放速率 |
| DOI： |
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| Research on release characteristics of heavy metals and performance of asphalt pavement surface prepared by soilds produced from oil-based cuttings utilization |
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yujinlei1, jiangguobin1, zhouxin2, lijichuan1, zhaoliang1, mengtian1, wanghongjuan1
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1.Safety, Environment and Technology Supervision Research Institute of PetroChina Southwest Oil and Gas Field Company;2.Construction Project Management Center，PipeChina Southwest Pipeline Co. Ltd
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| Abstract: |
| How to treat oil-based cuttings properly has become a key bottleneck that restricting the development of shale gas with green benefits. It is feasible to use solids produced from the thermal desorption of oil-based cuttings to replace the mineral powder to prepare the asphalt pavement surface. The performance indicators of the prepared asphalt pavement test block meet the requirements of the "Technical Specification for Highway Asphalt Pavement Construction" (JTG/T F40-2004) when the content of the remaining solid phase is not higher than 4.8wt%. The release characteristics of heavy metals in the asphalt surface test block were studied by the methods of GB/T 30810-2014 and EANEN 7375. The results showed that the release rates of 11 heavy metals (Arsenic, Barium, Cobalt, Copper, Chromium, Manganese, Molybdenum, Nickel, Lead, Vanadium, Zinc) were all less than 1%. And the risk of its migration and pollution to the groundwater environment was low. The release mechanisms of heavy metals in the asphalt surface test blocks were different. The release mechanism of arsenic and chromium is mainly dissolution, the release mechanism of barium, cobalt, manganese, nickel and lead is mainly surface scouring, and the remaining heavy metals are controlled by diffusion. The release rates of heavy metals showed the pattern of barium < cobalt < zinc < manganese < nickel < chromium < arsenic < lead < copper. |
| Key words: Oil-based cuttings Deoiling residue Asphalt surface Heavy metals Effective release Cumulative release Diffusion coefficient Release rate |
