STUDY ON THE MIGRATION PATTERNS OF COD CONTAMINANT IN AERATION ZONE OF A POWER PLANT BASED ON HYDRUS-1D

Aiming at the impact of pollutants on the aeration zone environment, this article establish the hydrogeological model by Hydrus-1D software and conduct numerical simulation of contaminant transport in aeration zone with numerical simulation method by taking the COD of a power plant as the predictor. The simulation results reflect the rules of contaminant transport and the conclusion show that under the condition that contaminant discharge is simplified as a constant point source, the pollution in aeration zone move downward with time, the closer to the infiltration point position, pollutant concentration is higher; the farther to the infiltration point position, the lower the concentration of pollutants. In soil profile, along with the depth increase, the pollutant concentration change rate increase.