Abstract: Soil and sediment samples were collected from the sites along the banks of the fourth Liuhe River and in the River in Nanjing Chemical Industrial Park, and, through soil sterilization and the controlling of temperature and 2,4-DCP initial concentration, the degradation dynamics of 2,4-dichlorophenol (2,4-DCP) in the soils and river sediment and related affecting factors were studied. Microbes played dominant roles in degrading 2,4-DCP. Within 45 d, the degradation rate of 2,4-DCP in non-sterilized soils and river sediment was 1.5-3 and 1.4-2.8 times of that in sterilized soils and river sediment, respectively. The microbe-degraded amount of 2,4-DCP in the soils and river sediment was 0.128-0.599 and 0.113-0.718 mg·kg^-1, respectively, and the half-life time of 2,4-DCP was shorter in non-sterilized than in sterilized treatment. Within the range of (10±1) ℃-(30±1) ℃, the degradation of 2,4-DCP was accelerated with increasing temperature. At (30±1) ℃, the residual amount of 2,4-DCP in the soils and river sediment was 0.305 and 0.203 mg·kg^-1, respectively, and the residual amount and half-life time were the smallest and shortest. The degradation speed of 2,4-DCP in the soils and river sediment was the fastest when its initial concentration was 0.5 mg·kg^-1. With the increase of 2,4-DCP initial concentration, the degradation speed of 2,4-DCP had a decreasing trend, and the half-life time became longer.

Key words: Eriocheir sinensis, Gut, Chitin, Digestive bacteria