presents the variations in DCA concentrations in four groups of aerobic microcosms during the 40-day incubation period. In the live control (intrinsic biodegradation) microcosms, a significant decrease in DCA concentrations was detected immediately after the start of operation. Results indicate that DCA could serve as the primary substrate, and indigenous soil bacteria could biodegrade DCA under aerobic conditions. Studies have reported that DCA could be biodegraded through hydrolytic dehalogenation and oxidation mechanisms under aerobic conditions using DCA as the primary substrate