超稠油采出水电絮凝深度除硅影响因素分析

Factor Analysis of Deep Silicon Removal by Electrocoagulation in Super-heavy Oil Produced Water

杨长根 樊玉新 胡远远 朱新建

YANG Changgen，FAN Yuxin，HU Yuanyuan，ZHU Xinjian

以铝板为阴阳极，采用电絮凝方法对超稠油采出水进行深度除硅研究。对电絮凝的影响因素进行了优选，得到最佳聚合氯化铝（PAC）用量、pH 值、电流密度及阴离子聚丙烯酰胺（PAM）用量。结果表明，单独电絮凝不能实现深度除硅。“电絮凝+PAC+PAM”对超稠油采出水除硅具有协同作用。当PAC加量为 200 mg/L、pH 值为8.0、电流密度为 10 mA/cm2、PAM加量为 50 mg/L 时，随着电絮凝时间的增加，SiO2 去除率增加，但增幅减小。当电絮凝时间为13 min时，电絮凝出水中的SiO2 含量为20 mg/L，SiO2去除率为92%，实现深度除硅。

Deep silicon removal of super-heavy oil produced water was developed through electrocoagulation by using aluminum plates as cathode and anode. The influence factor of electrocoagulation was optimized. Then the optimum pH value，current density，polyaluminum chloride（PAC）and anionic polyacrylamide（PAM）dosage were obtained. The results showed that single electrocoagulation could not achieve deep silicon removal. Electrocoagulation together with PAC and PAM had a synergistic effect on the removal of silicon from super-heavy oil produced water. Under the condition of 200 mg/L PAC，8.0 pH value，10 mA/cm2 current density and 50 mg/L PAM，the removal rate of SiO2 increased with increasing electrocoagulation time，but the increment decreased. When the electrocoagulation time was 13 min，the SiO2 content in electrocoagulation effluent was 20 mg/L，meanwhile the SiO2 removal rate was 92%，which achieved deep silicon removal.

10.19346/j.cnki.1000-4092.2022.03.023