紫外光高级氧化法处理二级出水中难降解有机物的研究  

Study onRemoval of Refractory Organic Pollutants From Secondary Effluent Organic Matter by Ultraviolet Advanced Oxidation Method

作　　者：李华 LI Hua(Shandong Province Environment Monitoring Center,Jinan Shandong 250101,China)

机构地区：[1]山东省生态环境监测中心,山东济南250101

出　　处：《当代化工》2023年第8期1882-1885,共4页Contemporary Chemical Industry

基　　金：天津市科技创新项目(项目编号:2021KC1567)。

摘　　要：紫外光高级氧化法是处理二级出水中难降解有机物的有效方法。在紫外光作用下,以过一硫酸钾(PMS)、过氧化氢(H2O2)和次氯酸钠(NaClO)为氧化剂,研究了氧化剂类型、浓度和紫外光强度对二级出水中2,4-二硝基苯酚(DNP)和亚硝基二甲胺(NDMA)去除效率的影响。结果表明,NaClO的降解效果最好,当NaClO浓度为1 mmol·L^(-1)、处理时间为60 min时,DNP和DNMA的去除率分别为25%和20%,这是由于在紫外光的照射下,NaClO分解产生HOCl·和OCl·自由基的量子产率高于PMS和H_(2)O_(2)所致;当NaClO初始浓度为2.5 mmol·L^(-1)、处理时间为60 min时,二级出水中DNP和DNMA的去除效率分别达到了50%和35%,DNP去除效率高是由于NaClO分解产生的自由基对芳香族化合物降解活性更高所致。当紫外光强度为6×10^(-11)E·s^(-1)时,DNP和DNMA的去除效率较好,再增加光强度,去除效率增加不明显。Ultraviolet advanced oxidation is an effective method to remove refractory organic pollutants in secondary effluent organic matter(EfOM).Excited by ultraviolet light,using potassium persulfate(PMS),hydrogen peroxide(H_(2)O_(2))and sodium hypochlorite(NaClO)as oxidants,effects of oxidant type,concentration and ultraviolet light strength on the removal efficiency of 2,4-dinitrophenol(DNP)and nitrosodimethylamine(NDMA)in EfOM were researched.The results showed that the NaClO exhibited the best degradation performance.When the concentration of NaClO was 1 mmol·L^(-1)and the treatment time was 60 min,the removal rates of DNP and DNMA were 25% and 20%,respectively.This was because the quantum yields of HOCl·and OCl·radicals produced by the decomposition of NaClO under ultraviolet light were higher than those of PMS and H_(2)O_(2);When the initial concentration of NaClO was 2.5 mmol·L^(-1)and the treatment time was 60 min,the removal efficiency of DNP and DNMA in the EfOM reached 50% and 35% respectively.The high removal efficiency of DNP was due to the higher degradation activity of free radicals generated by the decomposition of NaClO on aromatic compounds.When the intensity of ultraviolet light was 6×10^(-11)E·s^(-1),the removal efficiencies of DNP and DNMA were better,but with further increasing of light intensity,the improvement of removal efficiency was not significant.

关 键 词：紫外光 高级氧化法 二级出水 2 4-二硝基苯酚 亚硝基二甲胺 

分 类 号：O644.1[理学—物理化学]