ZVI/EDDS/Air体系降解水中2,4-二氯酚的研究

Degradation of 2,4-Dichlorophenol in Aqueous Solution by ZVI/EDDS/Air System

建立零价铁(ZVI)、乙二胺二琥珀酸(EDDS)和曝气三者组成的类Fenton(ZVI/EDDS/Air)处理体系,考察了初始EDDS浓度、铁粉投加量、曝气速率、2,4-二氯酚(2,4-DCP)浓度、初始pH以及反应温度等对水溶液中2,4-DCP降解的影响.结果表明,该体系能有效降解2,4-DCP,并且其降解规律符合准一级动力学方程.在2,4-DCP质量浓度100 mg·L-1、EDDS浓度0.80 mmol.L-1、铁粉投加量20 g·L-1、曝气速率为2 L.(min.L)-1的最佳实验条件下室温反应1 h,2,4-DCP的降解率达到99%.ZVI/EDDS/Air体系对氯酚的降解较ZVI/EDTA/Air体系具有环境友好、反应条件温和,而且对2,4-DCP的降解效果好等优点.

A new oxidation system of Fenton-like system（ZVI/EDDS/Air） has been developed to degrade 2,4-chlorophenols（2,4-DCP） in aqueous solution.The influences of initial conditions,i.e.,EDDS concentration,iron dosage,aeration rate,2,4-DCP concentration and pH as well as reaction temperature on the degradation of 2,4-DCP were studied.The results demonstrated that this ZVI/EDDS/Air system was able to effectively degrade 2,4-DCP in aqueous solution,and the degradation of 2,4-DCP conforms to the pseudo-first-order reaction kinetics equation.Removal of above 99% 2,4-DCP was achieved in ZVI/EDDS/Air system at room temperature and pressure after 1 h reaction when the initial conditions were 2,4-DCP 100 mg·L^-1,EDDS 0.80 mmol·L^-1,ZVI 20 g·L^-1,aeration rate 2 L·（min·L）-1.Compared with ZVI/EDTA/Air system,ZVI/EDDS/Air system showed higher efficiency in the degradation of 2,4-DCP at ambient circumstance and was more environmentally benign.