A model to predict the effect of ionic composition on the thermal properties of energetic ionic liquids was developed by quantitative structure-property relationship modeling,which predicted the detonation velocity,pr...A model to predict the effect of ionic composition on the thermal properties of energetic ionic liquids was developed by quantitative structure-property relationship modeling,which predicted the detonation velocity,pressure,and melting temperature of energetic ionic liquids.A hybrid approach was used to determine the optimal subset of descriptors by combining regression with the genetic algorithm as an optimization method.The model showed the high accuracy,reaching a correlation factor of R^(2) as 0.71,0.73 and 0.68 for the correlation between the calculated detonation velocity,pressure and melting temperature against reported values.It was validated extensively and compared to the Kamlet–Jacobs equation.The effect of ion composition on the thermal properties of energetic ionic liquids could be quantitatively analyzed through the developed model,to give an insight for the design of new energetic ionic liquids.展开更多
Anoxic gas recirculation system was applied to control the membrane fouling in pilot-scale 4- stage anoxic membrane bioreactor （MBR）. In the anaerobic-anoxic-anoxic-aerobic flow scheme, hydrophilic polytetrafluoroet...Anoxic gas recirculation system was applied to control the membrane fouling in pilot-scale 4- stage anoxic membrane bioreactor （MBR）. In the anaerobic-anoxic-anoxic-aerobic flow scheme, hydrophilic polytetrafluoroethylene （PTFE） membrane （0.2 μm, 7.2 m2/module） was submerged in the second anoxic zone. During 8 months operation, the average flux of the membrane was 21.3 L/（m2.hr）. Chemical cleaning of the membrane was conducted only once with sodium hydroxide and sodium hypochlorite. Dissolved oxygen （DO） concentration in the second anoxic zone was maintained with an average of 0.19 ± 0.05 mg/L. Gas chromatography analysis showed that the headspace gas in the second anoxic reactor was mainly consisted of N2 （93.0% ± 2.5%）, O2 （3.8% ± 0.6%）, and CO2 （3.0% ± 0.5%）, where the saturation DO concentration in liquid phase was 1.57 mg/L. Atmospheric 02 content （20.5% ± 0.8%） was significantly reduced in the anoxic gas. The average pH in the reactor was 7.2 ± 0.4. As a result, the recirculation of the anoxic gas was successfully applied to control the membrane fouling in the anoxic MBR.展开更多
基金This research was also supported by the Global Research Laboratory(GRL)through the National Research Foundation of Korea(NRF)funded by the Ministry of Science,ICT and Future Planning(no.2016K1A1A2912753).
文摘A model to predict the effect of ionic composition on the thermal properties of energetic ionic liquids was developed by quantitative structure-property relationship modeling,which predicted the detonation velocity,pressure,and melting temperature of energetic ionic liquids.A hybrid approach was used to determine the optimal subset of descriptors by combining regression with the genetic algorithm as an optimization method.The model showed the high accuracy,reaching a correlation factor of R^(2) as 0.71,0.73 and 0.68 for the correlation between the calculated detonation velocity,pressure and melting temperature against reported values.It was validated extensively and compared to the Kamlet–Jacobs equation.The effect of ion composition on the thermal properties of energetic ionic liquids could be quantitatively analyzed through the developed model,to give an insight for the design of new energetic ionic liquids.
文摘Anoxic gas recirculation system was applied to control the membrane fouling in pilot-scale 4- stage anoxic membrane bioreactor （MBR）. In the anaerobic-anoxic-anoxic-aerobic flow scheme, hydrophilic polytetrafluoroethylene （PTFE） membrane （0.2 μm, 7.2 m2/module） was submerged in the second anoxic zone. During 8 months operation, the average flux of the membrane was 21.3 L/（m2.hr）. Chemical cleaning of the membrane was conducted only once with sodium hydroxide and sodium hypochlorite. Dissolved oxygen （DO） concentration in the second anoxic zone was maintained with an average of 0.19 ± 0.05 mg/L. Gas chromatography analysis showed that the headspace gas in the second anoxic reactor was mainly consisted of N2 （93.0% ± 2.5%）, O2 （3.8% ± 0.6%）, and CO2 （3.0% ± 0.5%）, where the saturation DO concentration in liquid phase was 1.57 mg/L. Atmospheric 02 content （20.5% ± 0.8%） was significantly reduced in the anoxic gas. The average pH in the reactor was 7.2 ± 0.4. As a result, the recirculation of the anoxic gas was successfully applied to control the membrane fouling in the anoxic MBR.
