Study On Using Two Phase Partitioning Bioreactor To Remove Styrene:Experiment And CFD Simulation

Two phase partitioning bioreactor（TPPB）with Non-aqueous phase（NAP）can enhance mass transfer of VOCs.In this study,silicone oil was used as NAP to construct TPPB,and OLPB comparative studied,circulating liquid p H,and for styrene removal performance.TPPB optimum technological conditions was discussed by using response surface optimization.Based on mass transfer mathematical model fitting for two bioreactors and biodegradation process,FLUENT was used to simulate the mass transfer performance as well as the velocity,concentration and turbulence situation.The results showed that:1)Compared with OLPB,ECand η of TPPB were higher under the same condition.When C_in was 200～400 mg·m^-3,η of both reactors was stable.Removal efficiency of TPPB reached 94% on average.TPPB had strong adaptability to the change of C_in.Maximum removal capacity of styrene under the conditions of this experiment was 46.00g·m^-3·h^-1.2)The optimal of OLPB and TPPB was 37.5 s,the p H of circulating liquid was 7,and L/G was 0.25.Response surface method was used to optimize the TPPB,and the optimal TPPB process conditions were obtained:was 45.77 s,circulating fluid p H was 7.26,and L/G was 0.25.The η was 96% after verification experiments under this condition.3)The β*_s in TPPB was higher at the same,and the mass transfer process of TPPB was more superior.The change of the EC was highly correlated with the Michaelis-Menten model.EC_max and K_s was higher in TPPB at the same.From the perspective of β*_s and EC_max,TPPB was more effective.4)CFD simulation of OLPB and TPPB was carried out by using FLUENT.By studying the continuous gas phase velocity distribution,styrene concentration distribution and flow field turbulence intensity in the two reactors,it was proved that the addition of silicone oil enhanced the mass transfer process of styrene,and improved the removal efficiency of styrene.