文章摘要
聚硅酸盐混凝剂处理压裂返排液的效果及影响因素
Effect and Influence Factors of Poly-silicic-cation Coagulant in Fracturing Flowback Fluids Treatment
  
DOI:10.19346./j.cnki.1000-4092.2017.04.027
中文关键词: 聚硅酸盐  压裂返排液  混凝  响应面  交互作用
英文关键词: poly-silicic-cation  fracturing flowback fluids  coagulation  response surface  interaction
基金项目:国家自然科学基金“半固化小球藻混养处理压裂返排液的污染物去除及代谢调控机理研究”(项目编号51504192),陕西省自然科学基础研究计划“微藻处理压裂返排液的污染物去除机理及产能耦合机制研究”(项目编号2016JQ5102),陕西省高校科协青年人才托举计划项目“页岩气压裂返排液处理与回用关键技术研究”(项目编号20160119),陕西省教育厅专项科研计划项目“页岩气压裂返排液处理与回用技术研究”(项目编号17JK1605)。
作者单位
李冉,潘杰,张丽,屈肖,杨江,秦文龙 西安石油大学石油工程学院陕西西安710065 
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中文摘要:
      为提高压裂返排液化学处理效率、降低后续深度处理工艺负荷,采用自制聚硅酸盐混凝剂(PSiC)对返排液进行混凝预处理,利用Box-Behnken 设计建立连续变量曲面模型进行Si 浓度、聚合pH、Si/(Al+Fe)摩尔比(Fe/Al摩尔比9∶1)3 因素3 水平实验设计,考察了这3 种因素对PSiC 混凝效果的影响,确定出合适的制备参数。进一步利用统计软件Design Expert 对实验数据进行多元回归拟合,并通过三维立体图像揭示三种因素交互作用规律。研究结果表明,Si/(Al+Fe)摩尔比对PSiC 混凝效果和稳定性影响较大,当Si 浓度、Si/(Fe+Al)比和pH值分别取3.41%、1.3、1.8 时,PSiC 具有最佳的混凝性能,投加量为130 mg/L(以铁铝和计)时压裂返排液的浊度去除率和COD去除率分别为88.52%和70.35%。Si 浓度、聚合pH、Si/(Al+Fe)摩尔比与处理效果之间的二次多项回归模型方程显著、可靠。Si 浓度和Si/(Fe+Al)比交互作用不显著,Si 浓度和pH有一定的交互作用,Si/(Fe+Al)比和pH交互作用较显著。图9表5 参12
英文摘要:
      In order to improve the efficiency of chemical treatment of fracturing flowback fluids,and reduce the load of subsequent treatment process,the poly-silicic-cation coagulant(PSiC)was prepared to treat fracturing flowback fluids. Through Box-Behnken experiment design and response surface analysis,optimization grouping of Si concentration,polymerization pH,Si/(Al+Fe)molar ratio was realized,a quadratic response surface model and optimum level values were obtained. The experimental data were multivariable regression fitting by the statistical software Design Expert. Three-dimensional images were used to reveal interaction between three factors. The results showed that coagulation performances and stability were significantly influenced by the Si/(Fe+Al)molar ratio. It was found that the optimization grouping of the main influence factors for coagulation were as following:Si concentration,pH value and Si/(Al+Fe)molar ratio being of 3.39%,1.3 and 1.8,respectively,and the removal rate of turbidity and COD were 88.52% and 70.35% ,respectively,with the active ingredient (Fe + Al) dosage of 130 mg/L. The quadratic polynomial regression equation model of Si concentration,polymerization pH,Si/(Al+Fe)molar ratio and treatment effect was significant and reliable. The interaction between Si concentration and Si/(Al+Fe)molar ratio was not significant,and there was some kind of interaction between Si concentration and pH,while the interaction between Si/(Al + Fe)molar ratio and pH was significant.
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