Application of Markov Chain Model on Environmental Fate of Phenanthrene in Soil and Groundwater

Based on the indoor physical models and the theories of Markov Chain Model the thesis scientifically depicts the migration and transformation of phenanthrene in soil and groundwater system. Phenanthrene is devided into two states in Markov Chain Model: absorption state (photolytic degradation, biological degradation, volatilization and migration output of groundwater) and transfer state (in soil and groundwater).The use of Matlab6.5 to simulate Markov Chain Model is revealed in the temporal migration and transformation of phenanthrene of the indoor physical model. The values of photolytic degradation, biological degradation, volatilization and migration of phenanthrene in surface soil layer are respectively 4.39630 mol, 5.16179 mol, 0.49147 mol, and 71.58263 mol. The values of biological degradation and migration of phenanthrene in vadose zone are respectively 51.18468 mol and 44.78492 mol. The values of biological degradation and migration of phenanthrene in acquifer are 0.08960 mol and 0.09102 mol.The results show that (1) various environmental fate states influencing the migration and transformation in different zone systems function differently; (2) that phenanthrene withholding capacity in unsaturated zone is about 4-5 times that in saturated zone; (3) that phenanthrene contents occurred in the liquid phase is much greater than that in the solid phse in terms of the steady phenanthrene distribution contents of various layers; (4)that it takes about 140 days for phenanthrene in surface soil layer to reach the steady state, 55 days and 20 day in sub-vadose zone and acquifer respectively.