三维电极法处理盐酸四环素废水的条件分析及优化

Condition Analysis and Optimization of Tetracycline Hydrochloride Wastewater Treatment by Three-Dimensional Electrode Method

为解决三维电极法处理污水在实际工程运行过程中运行成本高、能耗大的问题,通过探讨不同水平的初始pH、反应电压、曝气强度、电解质投加量、极板间距对反应效果的影响并分析对成本及能耗造成影响的原因。为在解决这一问题的基础上充分兼顾实际应用价值,研究计算系统去除单位质量COD所消耗的电能、单位有效极板面积降解量、电流效率,获取最适宜实际工程应用的极板间距为6.5 cm,符合实际工程运行的最佳反应条件为:反应电压7 V、曝气强度1 L·min^(-1)、电解质投加量2.5g·L^(-1)、初始pH=4,在此条件下盐酸四环素的降解率为100%,COD的降解率为83.47%。实验选用的粒子电极为载铁活性炭电极,反应装置为自制有机玻璃反应器,选用的分析指标为盐酸四环素降解率及COD降解率。

In order to solve the problems of high operating cost and high energy consumption in the practical engineering operation of sewage treatment by three-dimensional electrode method,the effects of different levels of initial pH,reaction voltage,aeration intensity,electrolyte dosage and electrode spacing on the reaction effect were discussed,and the reasons that affected the cost and energy consumption were analyzed.In order to solve this problem and give full consideration to the practical application value,the power consumption,degradation per unit effective electrode area and current efficiency of the system for removing COD were studied and calculated.The most suitable electrode spacing for practical engineering application was 6.5 cm,and the best reaction conditions for practical engineering operation were as follows:reaction voltage 7 V,aeration intensity 1 L·min^(-1),electrolyte dosage 2.5 g·L^(-1),and initial pH=4.Under these conditions,the degradation rate of tetracycline hydrochloride was 100%,and the degradation rate of COD was 83.47%.The particle electrode used in the experiment was iron-loaded activated carbon electrode,and the reaction device was self-made plexiglass reactor.The selected analytical indexes were tetracycline hydrochloride degradation rate and COD degradation rate.