LCA - assisted selection of shale gas extraction flowback - produced water treatment technologies
SU Pei-xing1,2, CHE Zhi-tao1,2, ZHANG Dai-jun1,2, LU Pei-li1,2, DING A-qiang1,2
1. State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China; 2. Department of Environmental Science, Chongqing University, Chongqing, 400044, China
Abstract：Due to the rapid development of China’s shale gas industry in recent years, it is necessary to evaluate impacts of shale gas extraction wastewater treatments on the environment and ecology. According to the two management modes of internal reuse and discharge after the treatment of wastewater from shale gas extraction (i.e. flowback-produced water (FPW) and the idea of life cycle assessment (LCA)), the Simapro tool was used to conduct inventory analysis of typical treatment technologies. Then a case study of a produced water treatment project in a shale gas field in China was designed to evaluate the potential environmental impacts of the selected treatment technology. The results show that the coagulation-flocculation treatment technology used in the internal reuse mode had the least impact on the environment and ecology. For the removal of organic matter in the emission standard mode, the electrocoagulation with iron electrode or biological aerated filter had less impact on the environment and ecology. For desalination of extraction wastewater with low salt content, the ecological environment impact of forward osmosis is lower than that of reverse osmosis, but the desalination effect of reverse osmosis is better. For desalinating salted extraction wastewater, the selected multi-effect evaporation and mechanical vapor recompression technology demonstrated less impact on the environment and ecology.
苏培兴, 车智涛, 张代钧, 卢培利, 丁阿强. 基于生命周期评价的页岩气开采返排-产出水处理技术选择[J]. 中国环境科学, 2022, 42(9): 4433-4443.
SU Pei-xing, CHE Zhi-tao, ZHANG Dai-jun, LU Pei-li, DING A-qiang. LCA - assisted selection of shale gas extraction flowback - produced water treatment technologies. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(9): 4433-4443.
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