强化电絮凝系统构建及其深度处理机制研究
Construction of an enhanced electrocoagulation system and investigation of its advanced treatment mechanisms
针对淀粉废水深度处理问题,采用电絮凝与空气电极耦合工艺,实现低能耗下淀粉废水二级出水的深度处理。通过优化阴极制备工艺,采用酸化炭黑与聚四氟乙烯(PTFE)以1.2∶1的质量比制备复合空气阴极,其H2O2产率达14.73 mg/(h·cm2),电流效率为86%。在电流密度20 mA/cm2、pH 4.0条件下,与传统电絮凝系统相比,空气阴极电絮凝系统对化学需氧量(COD)和浊度的去除效率分别提升了20%和10%。机理研究表明,该系统除电絮凝过程产生的羟基自由基(·OH)外,空气阴极电化学反应额外贡献了16%的COD去除率。在能耗方面,该系统表现出显著优势,空气阴极电絮凝系统单位能耗为1.58 kW·h/m3,较传统系统降低约34%,为高浊度有机废水深度处理提供了高效、低耗的解决方案。
For the issue of advanced treatment of starch wastewater,an electrocoagulation process coupled with an air-breathing cathode was employed to achieve advanced treatment of starch wastewater secondary effluent under low energy consumption.Through optimized cathode fabrication,a composite air cathode was prepared using acidified carbon black and polytetrafluoroethylene (PTFE) at a mass ratio of 1.2∶1,achieving an H2O2 production rate of 14.73 mg/(h·cm2) with a current efficiency of 86%.Under operational conditions of 20 mA/cm2 current density and pH 4.0,the air-cathode electrocoagulation system demonstrated 20% and 10% higher removal efficiencies for COD and turbidity,respectively,compared to conventional electrocoagulation systems.Mechanistic investigations revealed that,in addition to hydroxyl radicals (·OH) generated during the electrocoagulation process,the electrochemical reactions at the air cathode contributed an additional 16% to COD removal.The system exhibited significant energy efficiency advantages,with a specific energy consumption of 1.58 kW·h/m3,representing an approximate 34% reduction compared to traditional systems.This innovative approach provides an efficient and energy-saving solution for the treatment of high-turbidity organic wastewater.
water treatment technology / modified electrode / enhanced electrocoagulation technology
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河南省重点研发专项(221111320900)
河南省交通厅科技项目(2023-4-4)
黄河流域生态保护和高质量发展联合研究一期资助项目(2022-YRUC-01-050208-04)
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