Department of Environmental Science and Engineering, Sichuan University, Sichuan Research Center for Soil Environment Protection Engineering and Technology, Chengdu, 610065, China.
Department of Environmental Engineering, Chengdu University, Chengdu, 610106, China.
Chemosphere. 2022 Mar;291(Pt 1):132711. doi: 10.1016/j.chemosphere.2021.132711. Epub 2021 Oct 26.
Drilling cuttings, the primary byproduct from the exploration and mining of shale gas, are potentially hazardous wastes that are associated with the serious depletion of land resources and environmental safety problems. In this work, the distribution of polycyclic aromatic hydrocarbons (PAHs) in oil-based residues of shale gas drilling cuttings was studied. Furthermore, a column leaching test was carried out to investigate the leaching behaviour of PAHs. The results showed that (1) the concentrations of 4-ring PAHs were highest among the PAH concentrations detected from the oil-based residues, and the concentration of PAHs decreased with increasing particle size of the residues. (2) The PAH concentration in leachates from all the tested residues differed during the leaching process, and the cumulative amount of each leached PAH accounted for 1.50-3.20% of the total PAHs. (3) The first-order diffusion model (FRDM) was the most applicable model for describing the leaching characteristics of the PAHs, and the leaching rate was initially controlled by surface wash-off and then by diffusion.
钻井岩屑是页岩气勘探和开采过程中的主要副产物，属于潜在危险废物，与土地资源的严重耗竭和环境安全问题密切相关。在这项工作中，研究了油基岩屑中多环芳烃（PAHs）的分布情况。此外，还进行了柱浸出试验以研究 PAHs 的浸出行为。结果表明：（1）在油基岩屑中检测到的 PAH 浓度中，4 环 PAH 的浓度最高，且 PAH 浓度随岩屑粒径的增大而降低。（2）所有测试岩屑的浸出液中 PAH 浓度在浸出过程中存在差异，每种浸出 PAH 的累积量占总 PAHs 的 1.50-3.20%。（3）一级扩散模型（FRDM）最适用于描述 PAHs 的浸出特征，浸出速率最初受表面冲刷控制，然后受扩散控制。
