Research For Removal Of Benazolin In Water With Persulfate/Peroxymonosulfate Oxidants

The pesticides in the aquatic environment and drinking water has attracted extensive concern from researchers all over the world,and it have already threatened people's health.Advanced oxidation technology as a new type of water treatment technology,it degradation of pollutants thoroughly,needs less equipment investment,simple operation,is a hot research topic in the current water treatment technologies.This paper selected benazolin to remove the object,one of research using persulfate advanced oxidation degradation of grass in addition to the spirit.Mainly based on uv activation of advanced oxidation system are studied and advanced oxidation system based on thermal activation,from the perspective of influence factor,dynamic model and contrast examines the system the performance degradation and its mechanism of benazolin,for advanced oxidation process in the actual application to provide theoretical basis for water treatment.In UV/PS and UV/PMS systems and heat activated persulfate system were selected in the initial concentration,oxidant benazolin dosing quantity,pH value,concentration of humic acid as influence factor is studied,and the UV/PS and thermal heat activated PS system to study the influences of common anions in water in the system.The main conclusions of this study are as follows: the UV/PS,UV/PMS and heat activated PS process can effectively degrade grass in addition to the spirit,and in the UV/PS,UV/PMS and heat activated PS under various working conditions,the degradation of benazolin reaction always composite pseudo first order reaction kinetics.All systems with the reduction of benazolin initial concentration in the degradation of benazolin rates are rising,and first order kinetics constant kobs value and grass in addition to the exponential relationship between the initial concentration.Increase the concentration of oxidant in all the system can make the biodegradation rate of benazolin increased,and the concentration of oxidant and grass except the spirit of the level of degradation rate constant kobs values and present linear relationship.In the UV/PS system,for acidic or alkaline solution pH on the degradation rate of benazolin a certain degree,under neutral condition of benazolin degradation efficiency of the worst.In the UV/PMS system,pH of grass rate effect is not obvious,except the spirit of the degradation rate of the whole in acidic condition better than neutral and alkaline conditions.On the heat activated PS system,under the condition of neutral grass except the spirit of thedegradation rate of the slowest,and in alkaline and acidic conditions in rate have rise,and under the condition of alkaline degradation effect is better than acidic conditions.In the presence of a high concentration of humic acid in all system will create a competitive relationship and grass in addition to the degradation of the spirit,but in the heat activated PS system found in low concentration of humic acid can promote the degradation of benazolin.By cic and associates to the system and EtOH,found in the UV/PS system is the main work,OH,OH,in the UV/PMS system and the SO₄^-who work at the same time.In the thermal activation system,acidic conditions exist in the system of free radicals mainly for SO₄^-·,in alkaline conditions mainly OH · free radicals that exist in the system.In the UV/PS system and system of the heat activated PS system,adding the different concentrations of Cl^-,NO₃^-,HCO₃^-after consistent with first order kinetics model,and adding the Cl^-,NO₃^-,HCO₃^-all can inhibit grass in different degree in addition to the degradation of the spirit,the degree of inhibition of benazolin conforms to the law of HCO₃^->Cl^-> NO₃^-.