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以VUV/air(vacuum ultraviolet,真空紫外)降解模拟废水中的苯甲羟肟酸为研究对象,考察了废水pH、曝气量、污染物初始浓度及共存阴离子等因素对VUV/air降解苯甲羟肟酸效果的影响。实验结果表明:在VUV光源功率10W、苯甲羟肟酸初始浓度30mg/L、废水初始pH=4、曝气量0.6L/min、反应时间120min的条件下,VUV/air对苯甲羟肟酸模拟废水的降解效果最好,降解率为78.89%;其中共存阴离子对VUV/air降解苯甲羟肟酸的影响作用大小顺序依次为:SiO32->HCO3->CO32->SO42->Cl-。通过对VUV/air降解苯甲羟肟酸的机理分析研究发现,VUV/air降解苯甲羟肟酸的过程中起主要作用的是直接光降解和真空紫外产生的羟基自由基氧化分解。VUV/air降解废水中苯甲羟肟酸的行为符合一级动力学方程ln(Ct/C0)=-kt。
The degradation of benzohydroxamic acid in simulated wastewater by VUV / air (vacuum ultraviolet) was studied. The effects of wastewater pH, aeration, initial concentration of pollutants and coexisting anions on the degradation of benzo Effect of hydroxamic acid effect. The experimental results show that VUV / air has a good effect on the degradation of p-hydroxybenzimidazole under the conditions of 10W of VUV light source, initial concentration of benzohydroxamic acid of 30mg / L, initial pH of wastewater of 4, aeration of 0.6L / min and reaction time of 120min. The degradation efficiency of acid simulated wastewater was the best, with a degradation rate of 78.89%. The effects of coexisting anions on the degradation of benzohydroxamic acid by VUV / air were as follows: SiO32-> HCO3-> CO32-> SO42-> Cl- . Through the mechanism analysis of the degradation of benzoyl hydroxamic acid by VUV / air, it was found that the main role of VUV / air degradation of benzoyl hydroxamic acid is the direct photodegradation and hydroxyl radical oxidation and decomposition by vacuum ultraviolet. The degradation of benzohydroxamic acid in VUV / air was in accordance with the first order kinetic equation ln (Ct / C0) = - kt.