高浓度COD及含汞气田水的电化学处理研究  

Electrochemical Treatment of Wastewater Containing High Concentration COD and Mercury from Gas Field

作　　者：谢亮 杨萍萍 贺焕婷[2] 曾玉彬[3] 李凤新 万霞 XIE Liang;YANG Pingping;HE Huanting;ZENG Yubin;LI Fengxin;WAN Xia(Xinjiang Petroleum Engineering Co.,Ltd.,CNPC;Qinghai Oilfield Drilling and Production Technology Research Institute;School of Power and Mechanical Engineering,Wuhan University)

机构地区：[1]中油(新疆)石油工程有限公司 [2]青海油田钻采工艺研究院 [3]武汉大学动力与机械学院

出　　处：《油气田地面工程》2021年第8期31-35,共5页Oil-Gas Field Surface Engineering

摘　　要：含汞气田采出水具有含重金属、高COD、高盐、高硬度,同时含有硫化物、挥发酚、悬浮物和石油类等复杂的水质特点,对生态环境构成极大危害。采用电化学氧化方法对气田高浓度COD及含汞采出水进行处理,探究了电极材料、电解时间、电解电流密度、极板间距等因素对COD和汞去除效果的影响。结果表明:电催化的电解时间为3 h,极板间距2 cm,电流密度100 mA/cm2,原水pH值条件下,COD去除率为100%,汞的去除率为69.8%;COD和汞的去除过程符合一级反应动力学特征。将电化学氧化进一步与电絮凝及生物质碳吸附结合,处理后的污水能满足GB 8978—1996《污水综合排放标准》二级排放标准的要求。The mercury-containing produced water from the gas field has the characteristics of heavy metal,high COD,high salt,high hardness,and also contains sulfide,volatile phenol,suspended matter and petroleum,which poses great harm to the ecological environment.In this paper,high con-centration COD and mercury-containing produced water from the gas field are treated by electrochemi-cal oxidation method,and the effects of electrode materials,electrolytic time,electrolytic current density,electrode plate spacing and other factors on COD and mercury removal are investigated.The results show that under the condition of the electrolysis time is 3 h,the plate spacing is 2 cm,the cur-rent density is 100 mA/cm2,the removal rate of COD and mercury can achieve 100%and 69.8%re-spectively under the pH value of raw water.Moreover,the removal process of COD and mercury con-forms to the first-order reaction kinetics.By further combining electrochemical oxidation with electro flocculation and biomass carbon adsorption,the treated wastewater can meet the requirements of the second-level discharge standard of GB8978-1996“Comprehensive Sewage Discharge Standard”.

关 键 词：气田水 电化学氧化法 汞 COD 去除率 

分 类 号：X741[环境科学与工程—环境工程]