Pollution characteristics of groundwater in an agricultural hormone-contaminated site and implementation of Fenton oxidation process

The groundwater polluted by an agricultural hormone site was taken as the research object, and a total of 7 groundwater samples were collected at different locations in the plant. The main pollutants in the research area were determined to be extractable petroleum hydrocarbons (C-10-C-40); 1,2-dichloroethane; 1,1,2-trichloroethane; carbon tetrachloride; vinyl chloride, and chloroform; the maximum content of these pollutants can reach 271 mg/L, 1.68 x 10(7) mu g/L, 1.56 x 10(4) mu g/L, 9.53 x 10(4) mu g/L, 6.58 x 10(4) mu g/L, and 4.81 x 10(4) mu g/L, respectively. Aiming at the problems of groundwater pollution in this area, two sets of oxidation experiments have been carried out. The addition of NaHSO3 modified Fenton oxidation system was used in this contaminated water, which enhanced (2.2 similar to 46.7%) chemical oxygen demand (COD) removal rate. The highest removal rate of extractable petroleum hydrocarbons (C-10-C-40) can reach 99%. And the degradation rate of chlorinated hydrocarbon pollutants can reach 99% to 100%, which almost achieved the purpose of complete removal. In the NaHSO3 modified Fenton oxidation system, the addition of NaHSO3 accelerates the cycle of Fe3+/Fe2+ and ensures the continuous existence of Fe2+ in the reaction system, thereby producing more center dot OH and further oxidizing and degrading organic pollutants. Our work has provided important insights for this economically important treatment of this type water body and laid the foundation for the engineering of this method.

Automated summary

This study focused on groundwater polluted by an agricultural hormone site. By conducting oxidation experiments using NaHSO3 modified Fenton oxidation system, it was found that the system effectively removed pollutants, including oil hydrocarbons and chlorinated hydrocarbons.