Novel Mathematical Simulation of NOM (Natural Organic Matter) Motion in Bottom Sediment

摘要

Approach of organic material anaerobic biodegradation and species of organic matter in sediment were discussed, then a classifying method of the species was proposed on a new viewpoint. Based on the proposed method, a pore water COD numerical model in bottom sediment system was derived originally, which differs from other ADS model in adding a COD-creating term. The model was validated via microcosm experiment. Then the model was used to mathematically simulate COD concentration of pore water in bottom sediment in order to analyze sensitivity of parameters in the model. The results indicated that COD-creating factor at beginning stage, pore water COD-attenuating factor in bottom sediment are the most important coefficients in the new model, which should be estimated accurately. Results also show that, because of the assumption of sorption/desorption equilibrium, the new model is valid only when vertical velocity of pore water is less than 5 m/d.