Study on Migration and Transformation Rule of Organic Pollutants (COD) in Aerated Zone

摘要

Collecting waste water with a certain concentration of organic pollutants COD (chemical oxygen demand), static adsorption, static biodegradation and dynamic soil column experiments were made in laboratory, we researched migration and transformation of COD in aerated zone, and put forward a mathematical model showing the process. The results show that adsorption of organism in aerated zone is linear, which is represented by Henry's law s=K_dc+s_d, adsorption coefficient K_d =0. 069 3; biodegradation diagram accord basically with first-order kinetics equation c=c_0e~(-K_(1~t)), biodegradation coefficient K_1 = 0.049 9 d~(-1); dispersion coefficient D= 0. 002 42 m~2/d in experiments. The migration and transformation of organic pollutants (COD) in aerated zone jointly result from many factors such as dispersion, adsorption and biodegradation etc..