A membrane contact ozone(O3)bubble-free mass transfer technology was developed by assembling hydrophobic polytetrafluoroethylene(PTFE)hollow fiber membrane into membrane contactor.When the stirring speed reached 1000r/min,the mass transfer of membrane mass transfer(apparent mass transfer coefficient KLa=0.0807min-1)was equivalent to that of bubble mass transfer(KLa=0.0791min-1).The single factor experiment and L16(44)orthogonal experiment were carried out to study the effects of inlet flow rate,inlet O3 concentration,pH and phenol concentration on O3 mass transfer in hollow fiber membrane contact reactor.Range analysis,variance analysis,comprehensive balance analysis and weight matrix analysis were used for data processing,and the optimal mass transfer conditions of membrane contact O3 bubble-free mass transfer technology were determined.The results showed that the four experimental factors had a significant effect on the mass transfer effect of O3 without bubbles.The optimized mass transfer conditions were as follows:inlet flow rate 100mL/min,inlet O3 concentration 100mg/L,initial pH was 10 and pollutant concentration 30mg/L.Under the optimized conditions,the O3 mass transfer flux was maintained above 170mg/(m2·min),and the O3 absorption rate reached more than 80％.
维普
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