School of Resources and Environment, Yangtze University, Wuhan, 430100, China.
Key Laboratory of Exploration Technologies for Oil and Gas Resources, Ministry of Education, Yangtze University, Wuhan, China.
Environ Sci Pollut Res Int. 2021 Jun;28(23):29919-29930. doi: 10.1007/s11356-021-12830-z. Epub 2021 Feb 12.
Cost-efficient and environmentally friendly treatment of hydraulic fracturing effluents is of great significance for the sustainable development of shale gas exploration. We investigated the synergistic effects of plant-microbial treatment of shale gas fracturing waste fluid. The results showed that illumination wavelength and temperature are direct drivers for microbial treatment effects of COD and BOD, while exhibit little effects on nitrogen compounds, TDS, EC, and SS removals as well as microbial species and composition. Plant-microbial synergism could significantly enhance the removal of pollutants compared with removal efficiency without plant enhancement. Additionally, the relative abundance and structure of microorganisms in the hydraulic fracturing effluents greatly varied with the illumination wavelength and temperature under plant-microbial synergism. 201.24 g water dropwort and 435 mg/L activated sludge with illumination of 450-495 nm (blue) at 25 °C was proved as the best treatment condition for shale gas fracturing waste fluid samples, which showed the highest removal efficiency of pollutants and the lowest algal toxicity in treated hydraulic fracturing effluents. The microbial community composition (36.73% Flavobacteriia, 25.01% Gammaproteobacteria, 18.55% Bacteroidia, 9.3% Alphaproteobacteria, 4.1% Cytophagia, and 2.83% Clostridia) was also significantly different from other treatments. The results provide a potential technical solution for improved treatment of shale gas hydraulic fracturing effluents.
从经济和环保角度出发，高效处理水力压裂废水对于页岩气勘探的可持续发展具有重要意义。本研究考察了植物-微生物联合处理页岩气压裂废液的协同效应。结果表明，光照波长和温度是 COD 和 BOD 微生物处理效果的直接驱动因素，而对氮化合物、总溶解固体、电导率和悬浮物去除率以及微生物种类和组成的影响较小。与无植物增强的去除效率相比，植物-微生物协同作用可显著提高污染物的去除率。此外，在植物-微生物协同作用下，水力压裂废水中的微生物相对丰度和结构随光照波长和温度的变化而显著变化。在光照波长为 450-495nm（蓝光）、温度为 25°C 时，添加 201.24g 水芹和 435mg/L 活性污泥，被证明是页岩气压裂废液样品的最佳处理条件，该条件下污染物去除效率最高，处理后的水力压裂废水中藻类毒性最低。微生物群落组成（36.73%黄杆菌、25.01%γ-变形菌、18.55%拟杆菌、9.3%α-变形菌、4.1%噬细胞菌和 2.83%梭菌）也明显不同于其他处理。本研究结果为改进页岩气水力压裂废水处理提供了一种潜在的技术解决方案。
