铁碳芬顿耦合处理硫氰酸盐废水及其机理探究  

Treatment of Thiocyanate Wastewater by Iron-Carbon Microelectrolysis-Fenton Process and Study of Its Mechanism

作　　者：何茂林 岳正波[1,2,3] 詹欣源 张敏 徐武松 王进[1,2,3] HE Maolin;YUE Zhengbo;ZHAN Xinyuan;ZHANG Min;XU Wusong;WANG Jin(School of Resources and Environmental Engineering,Hefei University of Technology,Hefei 230009,China;Anhui Engineering Research Center of Industrial Wastewater Treatment and Resource Recovery,Hefei University of Technology,Hefei 230009,China;Key Laboratory of Nanominerals and Pollution Control of Anhui Higher Education Institutes,Hefei University of Technology,Hefei 230009,China)

机构地区：[1]合肥工业大学资源与环境工程学院,安徽合肥230009 [2]合肥工业大学安徽省工业废水处理与资源化工程研究中心,安徽合肥230009 [3]合肥工业大学纳米矿物与污染控制安徽普通高校重点实验室,安徽合肥230009

出　　处：《环境科学与技术》2024年第7期148-155,共8页Environmental Science & Technology

基　　金：国家自然科学基金面上项目(52070062);安徽省自然科学基金资助项目(2308085QE187)。

摘　　要：工业废水中硫氰酸盐是一种危害环境和人类健康的有毒物质,因难以降解等特性增加了废水处理难度。文章通过将微电解与芬顿耦合,并优化工艺参数,实现硫氰酸盐(SCN^(-))废水的高效处理。在微电解曝气量为1.5 L/min条件下,将pH值控制在3~4之间反应90 min,之后向出水中加入8 mL/L 30%H_(2)O_(2)溶液,磁力搅拌反应30 min,可使SCN^(-)浓度从508.3 mg/L降低至16.8 mg/L,去除率达到96.7%,继续反应至60 min可完全去除SCN^(-)。反应机理为:微电解产生的少量·OH将部分Fe^(2+)氧化为Fe^(3+),与SCN^(-)形成配合物Fe(NCS)_(6)^(3-),经氧化形成微量CN^(-),进一步矿化为NH_(3)和CO_(2)并挥发。芬顿阶段生成的大量·OH,将剩余CN^(-)及SCN^(-)全部氧化为CNO^(-),最终形成NO_(3)^(-)和N_(2)。该研究揭示了铁碳芬顿处理硫氰酸根的降解机制,为含硫氰酸盐废水提供了一种新的处理方法。Thiocyanate in industrial wastewater is a toxic substance that jeopardizes the environment and human health,and its characteristics such as difficult degradation increase the difficulty of wastewater treatment.In the article,the efficient pretreatment of thiocyanate(SCN^(-))wastewater was achieved by coupling iron-carbon micro-electrolysis with Fenton oxidation and optimizing the process parameters.Through the methods of one-factor experiment and kinetic analysis,it was determined that the SCN^(-)concentration could be reduced from 508.3 mg/L to 16.8 mg/L by controlling the pH of the reaction system between 3 and 4 for 90 min at the aeration of iron-carbon micro-electrolysis of 1.5 L/min,removing the water at the end of the reaction and adding 8 mL/L of 30%H_(2)O_(2)solution,and magnetically stirring the reaction for 30 min.The SCNconcentration was reduced from 508.3 mg/L to 16.8 mg/L with a removal rate of 96.7%,and the SCN^(-)was completely removed by continuing the reaction for 60 min.The small amount of·OH generated by micro-electrolysis oxidized part of Fe^(2+)to Fe^(3+),formed the complex Fe(NCS)_(6)^(3-)with SCN^(-),which was oxidized to form a trace amount of CN^(-),which was further mineralized to NH_(3)and CO_(2).The large amount of·OH generated in the Fenton stage oxidized the remaining CN^(-)and all SCN^(-)to CNO^(-),and finally mineralized to NO_(3)-and N_(2).This study provides a new pretreatment method for thiocyanate-containing wastewater,revealing the mechanism of the enhanced pretreatment of thiocyanate by iron-carbon Fenton technology.mechanism of pretreatment of thiocyanate.

关 键 词：铁碳芬顿耦合工艺 硫氰酸根 工业废水 反应动力学 降解机制 

分 类 号：X703[环境科学与工程—环境工程]