【摘要】 为降低液相中有机污染负荷,采用烧杯实验和气相色谱-质谱联用技术研究和分析了混凝-吸附法联用预处理页岩气压裂返排液的可行性。结果表明:精制硅藻土（硅藻土J）投加有利于污染物的去除,联用顺序和吸附反应时间可以影响处理效果;先投加硅藻土J 8 mg·L^-1,反应30 min后再投加PAC 2 000 mg·L^-1,COD和浊度去除率分别达到57%和87%;混凝-吸附联用能去除水中22种有机污染物,大部分烷烃类、醇类、邻苯二甲酸二丁酯和卤代烃得到很好的去除。PAC和硅藻土J联用比传统混凝/吸附可以更高效地降低溶液有机负荷物,可以作为一种页岩气压裂返排液预处理的方法。更多还原

【Abstract】 In this study, to reduce the organic pollution load in the liquid phase, the feasibility of the coagulation-adsorption for hydraulic fracturing flow-back fluid of shale gas pre-treatment was analyzed and discussed by Jar tests and gas chromatography-mass spectrometry. The results showed that the addition of refined diatomite（diatomite J） was beneficial to pollutants removal, and the addition sequence and adsorption reaction time had effects on the treatment results. When first dosing diatomite J at 8 mg·L^-1 and 30 minutes reaction, then dosing PAC at 2 000 mg·L^-1, the removal efficiencies of COD and turbidity were 57% and 87%,respectively. Coagulation-adsorption integrated process could remove 22 organic pollutants in fluid, and most of the alkanes, alcohols, dibutyl phthalate and halogenated hydrocarbons. This indicated that joint of PAC and diatomite J was more efficient to reduce the organic pollutants in fluid than traditional coagulation/adsorption method, and it can be used as an effective method for treating hydraulic fracturing flow-back fluid of shale gas.更多还原