Pollution characteristics of solid waste in shale gas mining drilling
WU Na1,2, NIE Zhi-qiang2, LI Kai-huan2, SUN Ying-jie1, CAI Hong-ying3, ZHANG Man-li3, ZHOU Qiong3, HUANG Qi-fei2
1. School of Environmental and Municipal Engineer, Qingdao University of Technology, Qingdao 266033, China; 2. State Key Laboratory of Environmental Criteria and Risk Assessment, Soil and Solid Waste Environmental Research Institute, Chinese Research Academy of Environmental Sciences, Beijing 100012, China; 3. Chongqing Solid Waste Management Center, Chongqing 401147, China
Abstract:Three shale gas fields in Chongqing were selected. The pollution characteristics of heavy metals, polycyclic aromatic hydrocarbons (PAHs) and petroleum hydrocarbons in wastewater-based and waste oil-based drilling cuttings from the shale gas mining of five drilling platforms were studied. The concentration of Ba in wastewater-based and waste oil-based drilling cuttings was significantly higher than that of other heavy metals. Zn, Ba, Cr, Ni, Cu and Pb were the main heavy metals in the wastewater-based drilling cuttings. While Ni, Cu, Zn, Pb, Ba, As, Cr were the main heavy metals in the waste oil-based drilling cuttings and among which the concentration of Ni, Cu, Zn and Pb exceeded the corresponding limit. The concentration of PAHs in wastewater-based and waste oil-based drilling cuttings were 1.74~14.8mg/kg and 302~595mg/kg, respectively, which did not exceed the limit of the identification standards for hazardous wastes-identification for toxic substance content. The concentration of the petroleum hydrocarbon in waste oil-based drilling cuttings was 112~213g/kg, which was much higher than the limit of the identification standards for hazardous wastes-identification for toxic substance content. At the same time, the concentration of BaP in the wastewater-based and waste oil-based drilling cuttings was higher than the limit of the soil environmental quality-risk control standard for soil contamination of agricultural land; the concentration of BaP, BbF, BkF and DahA in the waste oil-based drilling cuttings were higher than the screening values of the soil environmental quality-risk control standard for soil contamination of development land and the concentration of the petroleum hydrocarbons in the drilling cuttings were much higher than the intervention values.
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