Study On The Operation Effect And The Removal Mechanism Of Pollutants Of Microbubble Aeration-Aerobic Biological System

The conventional biological treatment methods are deficient in dissolved oxygen,low removal efficiency,insignificant microbial growth and low bioactivity.In this study,a microbubble aeration-biological packing aerobic biological system was constructed to improve the treatment effect of biofilm on phenol-containing industrial wastewater and domestic sewage by comparing the biofilm system under suspended filler and bionic aquatic filler.At the same time,the removal mechanism and microbial characteristics of pollutants in the reaction system were discussed,and the degradation of phenolic organic compounds and SND kinetic equations were further derived.The results show that:under the continuous and stable operation,the treatment effect,impact resistance load capacity,oxygen mass transfer efficiency,HRT,DO and so on based on treatment of suspended filler and bionic aquatic filler under microbubble aeration were better than that of conventional aeration.The treatment of biomimetic aquatic plants under microbubble aeration,the highest COD,NH₄^{+_</sup>N,and TN removal rates were 92.4%,85.6%,and 80.4%,respectively,and the HRT was 8 hours.The gas-liquid mass transfer efficiency increased with the increase of air flow and influent concentration,while increased the decomposition rate of pollutants.The analysis of the biofilm thickness,biomass and biological activity on the filler showed that biological bio-enrichment of the the microbubble aeration has obvious advantages,and the biomass and biological activity are increased by 40%50%compared to the conventional aeration.Therefore,microbubble aeration can improve the growth of denitrifying bacteria and nitrifying bacteria,so as to improve the removal of biofilm reactor nitrogen pollutants.The SND effect was the best when DO of the suspended aerobic biological system was controlled at 23mg·L-1,the C/N was at 68,and the pH was at 7.07.5.In the same condition,the SND kinetic model of bionic aquatic filler aerobic biological system is consistent with the concentration of ammonia and nitrogen in and out of water.It shows that simultaneous short-cut nitrification and denitrification can be realized in the reactor.The degradation test of phenol-containing wastewater shows that through the microbubble aeration and bioaugmentation,the removal rate is higher than that of the control group;the pollutant removal effect is obvious under the optimum working conditions,,The average removal rates of COD,phenol,TN in the suspended filler reactor were 87.3%,90.3%,and 57.6%,respectively.The average removal rates of COD,phenol,and TN in the bionic aquatic filler reactor were 91.1%,95.5%,and 69.5%..COD and TN removal rates were higher than those of suspended filler showed that oxidation of biological system consisting of the bionic aquatic filler are more capable of redox and SND.A kinetic model of phenol degrading bacteria was established.The predicted value of the curve was similar to that of the experimental results,which indicated that the model could explain the experimental results and phenomena,and the pseudo-unicellular bacteria has strong phenol degradation ability.}