纳米Fe3O4/微生物联合体系对2,4-D和阿特拉津降解的研究

采用纳米Fe3O4/微生物联合体系降解溶液中2,4-D和阿特拉津，考察了不同2,4-D和阿特拉津初始浓度、微生物接种量、纳米Fe3O4投加量、溶液ｐＨ值等对降解效果的影响。结果表明，纳米Fe3O4/微生物联合体系对2,4-D和阿特拉津的降解率显著高于纳米Fe3O4和微生物单一体系；2,4-D和阿特拉津初始浓度在0～10 mg·L^-1、微生物接种量在0～12 mg·L^-1、纳米Fe3O4的投加量在0～200 mg·L^-1范围内，2,4-D和阿特拉津的降解率随其初始浓度、微生物接种量和纳米Fe3O4 投加量的增大而增加。溶液pH3．0左右、2,4-D和阿特拉津初始浓度10 mg·L^-1、微生物接种量12 mg·L^-1、纳米Fe3O4投加量200 mg·L^-1，是反应的最佳条件，此实验条件下反应7 d，2,4-D和阿特拉津的残留率分别降低至35．7％和54．0％。

Degradation of 2,4-D and Atrazine by Nanoscale Fe3O4 and Microorganism Integrated Treatment System

The degradation of 2,4-D and atrazine in solution with a combination of nanoscale Fe3O4 and microorganism were studied. The influences of initial concentration of 2,4-D and atrazine, microbial inoculation amount, the dosage of nanoseae Fe3O4 and solution pH value were investigated using batch experiments. The results showed that the degradation rates of 2,4-D and atrazine increased with increases the initial concentration of 2,4-D and atrazine from 0 to 10 mg·L^-1, and increases the microbial inoculation amount from 0 to 12mg·L^-1, as well as increases the dosage of nanoseale Fe3O4 from 0 to 200mg·L^-1. The optimum reaction conditions for 2,4-D and atrazine removal were as follows：pH 3.0 of the solution, the initial concentration 10 mg·L^-1 of 2,4-D and atrazine, the inoculation amount 12 mg·L^-1 of microorganism, and the doesge 200mg·L^-1 of nanoscale Fe3O4. After the reaction time of 7 days in this condition, the residual rates of 2,4-D and atrazine were reduced to 35.7% and 54.0%. As a result, a combination of nanoscale Fe3O4 and microorganism could accelerate the dechlorination of 2,4-D and atrazine compared to the individual use. It suggested that there were significant synergistic effects between nanoscae Fe3O4 and microorganism for the degradation of 2,4-D and atrazine.