摘要:
采用电絮凝技术处理高温超稠油采出水,考察了反应时间、电流密度和极板间距对电絮凝处理效果的影响,通过响应面法对电絮凝处理超稠油采出水工艺条件进行了优化,并对电絮凝过程净化机理和电极钝化的影响因素进行了研究。研究表明,电絮凝技术能有效去除高温超稠油采出水中的油、COD和SiO2,反应时间对COD和SiO2去除率影响极显著。当反应时间为27.2 min,电流密度为8.6 mA/cm2,极板间距为1.8 cm时,COD和SiO2去除率分别为81.0%和100%。电絮凝对采出水起净化作用的是铝离子与OH-结合生成的多核羟基铝络合物胶体。采出水中Cl-含量的增加使铝板的钝化程度略有减弱,而SO4 2-和HCO3 -含量的增加使铝板的钝化程度增加;当采出水呈中性时,铝板的钝化程度最高。
关键词:
高温超稠油采出水,
电絮凝,
响应面法,
钝化
Abstract:
Electrocoagulation was used to treat the high temperature super-heavy oil produced water. The effects of relevant factors were studied, including reaction time, current density and plate distance. The response surface methodology was used to optimize the process conditions. The mechanisms of purification in electrocoagulation and factors affecting electrode passivation were also studied. The results showed that the electrocoagulation could effectively remove oil, COD, and SiO2 from high temperature super-heavy oil produced water. Reaction time had a significant impact on the removal rate of COD and SiO2. When the reaction time was 27.2 min, the current density was 8.6 mA/cm2, and the electrode distance was 1.8 cm, the removal rates of COD and SiO2 were 80.95% and 100% respectively. Electrocoagulation played an important role in the removal of organic matter, which was the multinuclear hydroxy aluminum complex colloid generated by the combination of aluminum ions and OH-. The increase of Cl- in the produced water slightly weakened the passivation of aluminum plates. The increase of SO4 2- and HCO3 - increased the passivation of aluminum plates. When the produced water was neutral, the passivation of aluminum plate was the highest.
Key words:
high temperature super-heavy oil produced water,
electrocoagulation,
response surface methodology,
passivation
中图分类号:
谢亮, 石姝彤, 郑帅, 吴隽玮, 孙鑫格, 张琦, 杨萍萍, 曾玉彬. 高温超稠油采出水的电絮凝实验及机理分析[J]. 工业水处理, 2024, 44(6): 101-110.
Liang XIE, Shutong SHI, Shuai ZHENG, Junwei WU, Xin'ge SUN, Qi ZHANG, Pingping YANG, Yubin ZENG. Experiment and mechanism analysis of electrocoagulation for high temperature super-heavy oil produced water[J]. Industrial Water Treatment, 2024, 44(6): 101-110.