采用化学氧化法降解贝类养殖水中扑草净残留的研究

Study on degradation of prometryn residue in shellfish aquaculture water by chemical oxidation

摘要:

为去除贝类养殖过程中残留的农药扑草净,研究了不同处理(正常、超声波震荡、紫外线照射和不同pH)条件下高锰酸钾、过氧化氢和次氯酸钠对扑草净的降解效果。结果显示,次氯酸钠对扑草净的降解率最高,其降解效果不受紫外线照射、超声波震荡以及水体pH变化的影响。高锰酸钾和过氧化氢对扑草净的降解率较低,超声波震荡和紫外线照射辅助处理对降解效果没有影响,但当水体pH为10时,高锰酸钾和过氧化氢对扑草净的降解率显著提高。研究还对次氯酸钠降解扑草净的反应动力学进行了探讨,结果表明,扑草净的氧化降解符合二级反应动力学模型。

Abstract:

The efficiency of the degradation of prometryn residue in aquaculture water after oxidizing by potassium permanganate, hydrogen peroxide and sodium hypochlorite were examined under various conditions, including normal conditions, ultraviolet irradiation, ultrasonic treatment and pH, thus providing a feasible approach for degradation and removal of prometryn residue in aquaculture water. The results showed that sodium hypochlorite had the highest oxidation degradation rate and its degradation effect was not affected by ultraviolet irradiation, ultrasonic and pH. Potassium permanganate and hydrogen peroxide had no obvious effect on the degradation of prometryn. Ultrasonic and ultraviolet had no effect on the degradation rate of these two oxidants. However, when the pH value was 10, the removal effect of potassium permanganate and hydrogen peroxide on prometryn was significantly improved. The oxidation of prometryn by sodium hypochlorite was found to obey a second-order reaction kinetics model.