The effects of feed temperature and pH value on the removal of aqueous phenol wastewater by vacuum membrane distillation process are studied by experiments employing micro porous membranes of poly vinylidene fluoride ...The effects of feed temperature and pH value on the removal of aqueous phenol wastewater by vacuum membrane distillation process are studied by experiments employing micro porous membranes of poly vinylidene fluoride (PVDF) and ploy tetrafluoro ethylene (PTFE) with nominal average pore sizes 0.22 mm and 0.20 mm, respectively. It is found that the optimal feed temperature for PVDF membrane is 50 ℃; and for PTFE membrane, 60 ℃. The pH value of the feed has little influence on the membrane fluxes and ion rejection ratios, while it influenced considerably on the selectivity. Increase of pH value of the feed is conducive to the increase of selectivity. In the same experimental conditions, PTFE membrane shows better separation performance than PVDF membrane does.展开更多
The wastewater discharged from the 1.0 Mt/a ethylene unit at Maoming Petrochemical Company was separated according to its quality, and a major part ofwastewater with better quality was properly treated via the process...The wastewater discharged from the 1.0 Mt/a ethylene unit at Maoming Petrochemical Company was separated according to its quality, and a major part ofwastewater with better quality was properly treated via the process of＂IRABF ＋ high-efficiency fiber filtering ＋ disinfection＂ to make the wastewater quality comply with the quality of recycled cooling water, so that the technique for reused petrochemical wastewater was more reliable technically and more reasonable economically,展开更多
文摘The effects of feed temperature and pH value on the removal of aqueous phenol wastewater by vacuum membrane distillation process are studied by experiments employing micro porous membranes of poly vinylidene fluoride (PVDF) and ploy tetrafluoro ethylene (PTFE) with nominal average pore sizes 0.22 mm and 0.20 mm, respectively. It is found that the optimal feed temperature for PVDF membrane is 50 ℃; and for PTFE membrane, 60 ℃. The pH value of the feed has little influence on the membrane fluxes and ion rejection ratios, while it influenced considerably on the selectivity. Increase of pH value of the feed is conducive to the increase of selectivity. In the same experimental conditions, PTFE membrane shows better separation performance than PVDF membrane does.
文摘The wastewater discharged from the 1.0 Mt/a ethylene unit at Maoming Petrochemical Company was separated according to its quality, and a major part ofwastewater with better quality was properly treated via the process of＂IRABF ＋ high-efficiency fiber filtering ＋ disinfection＂ to make the wastewater quality comply with the quality of recycled cooling water, so that the technique for reused petrochemical wastewater was more reliable technically and more reasonable economically,
