消除芬顿溶液中的H_(2)O_(2)及氧化过程pH、ORP的响应  

Elimination of H_(2)O_(2) in Fenton Solution and Response of pH and ORP During Oxidation Process

作　　者：沈伟 李虎 刘利娟 SHEN Wei;LI Hu;LIU Lijuan(Sichuan Greence Environmental Technology Co.Ltd.,Meishan Sichuan 620000,China)

机构地区：[1]四川高绿平环境科技有限公司,四川眉山620000

出　　处：《辽宁化工》2025年第2期223-229,共7页Liaoning Chemical Industry

摘　　要：芬顿氧化是污水处理中常用的高级氧化法。当测定芬顿溶液中COD时,残留的过氧化氢会消耗重铬酸钾,造成测定结果偏高。为分析过氧化氢影响COD测定的原因,探讨亚硫酸钠消除样品中残留过氧化氢以及空气氧化消除样品中的SO_(3)^(2-)、Fe^(2+)的可行性。结果表明:过氧化氢、SO_(3)^(2-)、Fe^(2+)的浓度与COD之间存在有较好的线性关系。亚硫酸钠能消除样品残留的过氧化氢。样品初始pH值为8.0、c_0(SO_(3)^(2-))/c_0(Fe^(2+))=2.0时,控制搅拌转速=600 r·min^(-1),并结合pH值与氧化还原电位(ORP)共同判断空气氧化的终点,SO_(3)^(2-)/Fe^(2+)脱除率可达96.87%以上,基本消除了样品中的SO_(3)^(2-)、Fe^(2+),确保了COD测定值的准确性。Fenton oxidation is a commonly used advanced oxidation method in wastewater treatment.When measuring COD in Fenton's solution,residual hydrogen peroxide consumes potassium dichromate,resulting in a higher measured result.The reasons for the influence of hydrogen peroxide on COD determination were analyzed,and the feasibility of eliminating residual hydrogen peroxide in samples by sodium sulfite and removing SO_(3)^(2-)and Fe^(2+)in samples by air oxidation was explored.The experiment results show that:there is a good linear relationship between the concentrations of hydrogen peroxide,SO_(3)^(2-),Fe^(2+)and COD.Sodium sulfite can eliminate residual hydrogen peroxide in the sample.When the initial pH of the sample is 8.0 and the c0(SO_(3)^(2-))/c0(Fe^(2+))ratio is 2.0,the stirring speed is controlled at r=600 r·min-1,and the endpoint of air oxidation is determined by combining pH and oxidation reduction potential(ORP).The SO_(3)^(2-)/Fe^(2+)removal rate can reach over 96.87%,which basically eliminates SO_(3)^(2-)and Fe^(2+)in the sample,ensuring the accuracy of COD measurement.

关 键 词：亚硫酸钠 过氧化氢 空气氧化 COD 

分 类 号：TQ016[化学工程]