Experimental Study on Micro-polluted Water Treatment by Intermittent Aeration Bio-contact Oxidation Process

An intermittent aeration biological contact oxidation process was used to treat micro-polluted water in experiment.The removal effect of NH4+-N and CODMn by pulse aeration biological contact oxidation was studied under different intermittent conditions,and superiority of this technology comparing to continuous aeration bio-contact oxidation process was discussed.The results showed that when the intensity of aeration is 4 m3/(m2·h) and the ratio of without aeration time to aeration time is 6:4 to 9:1,the average removal rate of NH4+-N and CODMn achieved 69.49% to 93.51% and 21.12% to 24.29%,respectively,and the biomass of bio-media was 265.53 nmol/m3 to 938.63 nmol/m3.The effect of intermittent aeration biological contact oxidation process to treat micro-polluted water is better than that in continuous aeration biological contact oxidation process when the ratio of without aeration time to aeration time is not less than 8:2 and the dissolved oxygen is not less than 4 mg/L.The intermittent aeration biological contact oxidation process saved 60% to 80% air volume than that of continuous aeration.