[Degradation of 2, 4-dichlorophenol in aqueous solution by ZVI/EDDS/air system].

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.