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采用电化学法处理油田开发三次采油过程中产生的聚驱采油废水,考察了pH值、反应时间、电流强度对污染物降解效果的影响。结果表明,pH=3.25时,COD和HPAM去除率最高,分别达到83.03%和98.66%;电流强度为0.8 A时,COD及HPAM去除率最高,为85.24%和99.63%;pH=3.25、电流强度为0.8 A时,COD及HPAM去除率随时间延长而增大,反应30 min后去除率基本不变。研究了处理过程中电流效率的变化,发现反应前10 min内电流效率最高,达23.63%;并通过投加与电化学溶出的新生态铁等量的铁盐絮凝剂(FeSO_4)分析了电化学中电絮凝作用的贡献,酸性条件下电化学过程对COD去除率为83.79%,同等条件下,FeSO_4混凝的COD去除率为70.31%,电化学作用过程中氧化、气浮及电场作用对COD的去除率贡献最高为13.48%,因此,电化学法处理聚驱采油废水的主要作用机理为电絮凝作用。研究表明,电化学法能有效降解聚驱采油废水。
Electrochemical treatment of polymer flooding wastewater generated during the third oil recovery was used to investigate the effect of pH value, reaction time and current intensity on pollutant degradation. The results showed that the removal rates of COD and HPAM reached 83.03% and 98.66% at pH = 3.25 and 85.24% and 99.63%, respectively at the current intensity of 0.8 A, pH = 3.25, When 0.8 A, the removal rates of COD and HPAM increased with time, and the removal rate basically remained unchanged after 30 min reaction. The change of current efficiency during the treatment was studied. The highest current efficiency reached 23.63% within 10 min before the reaction. The ferric salt flocculant (FeSO 4) In the same condition, the COD removal rate of FeSO_4 coagulation was 70.31%. The effects of oxidation, air flotation and electric field on the electrochemical reaction of COD The highest contribution to the removal rate of 13.48%, therefore, the main role of electrochemical treatment of polymer flooding wastewater wastewater treatment mechanism for the role of electro-flocculation. Research shows that the electrochemical method can effectively degrade polymer flooding wastewater.