UV-H2O2系统对水中2,4-二氯酚氧化降解研究

研究了用UV-H2O2体系对水中2,4-二氯酚氧化降解。结果表明,UV-H2O2体系中H2O2的投加量主要由UV光强度和有机物初始浓度来确定,酸性和中性条件下有利于UV-H2O2体系对2,4-二氯酚的降解;最佳反应温度在20～25℃;UV-H2O2光氧化技术适用于低浊度水的深度处理,降解效果以浊度6 NTU为分界点。在Fenton试验中,向质量浓度为20mg/L的2,4-二氯酚溶液加入2.0mg/L的Fe2+,同时把H2O2的投加量减为0.204mg/L,pH值3.0左右,此时UV-H2O2-Fenton体系对2,4-二氯酚的氧化效率大大提高,比单纯Fenton体系的降解率提高1倍,达到95.6%。用UV-Fenton体系去除有机污染物在效果和经济上均具有明显的优越性。

Oxidation and degradation of 2,4-dichlorophenol in water by UV-H2O2 system

The oxidation and degradation of 2,4-dichlorophenol in water by UV-H2O2 system was studied.The results indicated that,the dosage of H2O2 in UV-H2O2 system mainly depended on the strength of UV radiation and the initial concentration of organic contaminants,acid and neutral conditions were in favor of the degradation of 2,4-dichlorophenol by UV-H2O2 system;the optimal reaction temperature was ranged between 20-25 ℃;UV-H2O2 photo-oxidation technology was only available for the advanced treatment of low-turbidity water with a critical limitation of 6 NTU turbidity.In the Fenton experiment,under the condition that,2.0 mg/L of Fe2+ was added into the 2,4-dichlorophenol solution with the mass concentration of 20 mg/L,the dosage of H2O2 decreased to 0.204 mg/L,the pH value was about 3.0,the efficiency of the UV-H2O2-Fenton system on 2,4-dichlorophenol oxidation was improved greatly;the degradation rate of 2,4-dichlorophenol by the said system was twice higher than by Fenton system only,reached 95.6%.It was proved that UV-Fenton system had obvious superiority both in effect and in economic benefits for removal of the organic contaminants.