Effect of Different Carriers on Anaerobic Ammonium Oxidation Process

To investigate the effect of different carriers on process of anaerobic ammonia oxidation,two types of materials including water-bone polyurethane(WPU) and activated carbon,were used for microbial immobilization in two different UASB reactors.The synthetic wastewater containing ammonia and nitrite was applied as raw water and variation of nitrogen compounds was analyzed.The study verified the possibility of domesticating anaerobic ammonium oxidation bacteria from the environment in biological activated carbon(BAC) system.The comparison of nitrogen removal efficiency in different running stages indicated that the immobilized sludge had no distinct advantage in reactor start-up as it might have become the obstacle of mass transfer,while the activated carbon proved to be an ideal microbial carrier due to synergistic effect of contaminant adsorption,bacterial aggregation and microbial degradation,combined with its protection of microorganisms from deleterious surroundings.