电催化氧化脱除气田采出水中硫化物  被引量:2

Removing Sulfide in Gas Field Produced Water by Electrooxidation

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作  者:张舸[1] 金艳 李丽[1] 韩昫身 高荔 于建国[1] ZHANG Ge;JIN Yan;LI Li;HAN Xushen;GAO Li;YU Jianguo(Engineering Research Center of Resources(Salt Lake)Process Engineering,Ministry of Education,East China University of Science and Technology,Shanghai 200237,China;Suzhou Juzhi Tongchuang Environmental Technology Co.Ltd,Changshu 215513,Jiangsu,China;Qindao Technical College,Qindao 266071,Shandong,China)

机构地区:[1]华东理工大学资源(盐湖)过程工程教育部工程研究中心,上海200237 [2]苏州聚智同创环保科技有限公司,江苏常熟215513 [3]青岛职业技术学院,山东青岛266071

出  处:《华东理工大学学报(自然科学版)》2022年第5期565-575,共11页Journal of East China University of Science and Technology

基  金:中国石油科技创新基金(2020D-5007-0502);上海市青年科技英才扬帆计划(20YF1409500);中央高校基本科研业务费专项基金(50321022017008)。

摘  要:采用污染小、效率高的电化学氧化法对高盐度、高硬度气田采出水的脱硫过程进行研究。选用Ti/RuO_(2)-SnO_(2)-IrO_(2)阳极材料,在极板间距为5 cm、电流密度为200 A/m^(2)、曝气量为1 L/min、初始pH为9~10的条件下,对模拟气田采出水(硫化物质量浓度为300 mg/L,NaCl质量分数为2.50%)处理35 min后,脱硫率高达99.2%以上,平均单位能耗为55.2 kW·h/kg(以每千克S^(2−)计,全文同)。研究还发现,针对高硬度体系下的阴极结垢问题,利用倒极方法可有效去除结垢物,保证装置稳定运行。Certain amounts of sulfide are present in gas field produced water,which brings negative effects on the environment and human health.Since the electrochemical oxidation method has the advantages of high efficiency without secondary pollution,we introduce it into the sulfide removal process under the conditions of high salinity and hardness.Based on the cyclic voltammetry characteristics,sulfide removal efficiency,and economic analysis,Ti/RuO_(2)-SnO_(2)-IrO_(2) was selected as the anode.The removal of sulfide by two-dimensional electrochemical oxidation followed zero-order kinetics,which was namely that residual sulfide concentration in solution had a linear relationship with time in all reaction stages.Sulfide existed in the form of HS−in the solution.For the reason that H+would be released when HS−was oxidized,it was necessary to select a suitable initial pH and control the reaction time.The sulfide removal ratio and corresponding energy consumption of simulated gas field produced water with 300 mg/L sulfide and 2.50%(mass fraction)NaCl were above 99.2%and 55.2 kW·h(calculated by S^(2−) of per kilogram),respectively,with the electrode distance of 5 cm,current density of 200 A/m^(2),aeration rate of 1 L/min,the initial pH of 9−10,and running time of 35 min.Moreover,reversing cathode and anode was found to effectively solve the problem of scaling on cathode caused by high Ca^(2+)and Mg^(2+)concentration.

关 键 词:气田采出水 硫化物 电氧化 金属氧化物涂层钛电极 阴极结垢 

分 类 号:X741[环境科学与工程—环境工程]

 

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