Study On The Mechanism Of Organic Matter Removal And Kinetic By Biological Activated Carbon Follwing Ozonation

In this paper,experimental investigations were conducted to treat the P-hydroxybenzoic acid by Ozone and Granular Activated Carbon(O₃—GAC),Ozone and Biological Ceramic Filter(O₃—BCF),and Ozone and Biological Activated Carbon(O₃—BAC),by comparing the microbial biological activity of BAC and BCF filter bed,the quantitative method of adsorption and biological degradation in the process of removal organic matter by O₃—BAC was established,and the kinetics was studied.The results show that the mechanism of organic matters removal by O₃-BAC is a synergic effect of ozonation,adsorption and biodegradation,of which biodegradation played a major role.With the raw water after ozonation followed by BAC,52%of reduction of P-hydroxybenzoic acid was due to biodegradation and 48%was due to adsorption,while the raw water without ozonation followed by BAC,42%of reduction of P-hydroxybenzoic acid was due to biodegradation and 58%was due to adsorption.The results show that the effective running time of BAC filter bed was extended,with the raw water after ozonation followed by BAC.In this study,comparison the regularity of organic matter removal by the BCF with homology microbe,then based on the basic equations of microbial growth dynamics-the Monod equation,we deduce the biodegradation kinetics equation of BAC filter bed.To sum up the above arguments,we draw the conclusion that the biodegradation kinetics model of the O₃-BAC filter bed coincides with high matrix density organic matter degeneration model, which is a first order reaction.According to this equation,we have studied the adsorption performance of biological activated carbon bed,and found that as the microbe deducing in the bed,its adsorption is gradually enhanced.