【摘要】 采用规模为20 m³/d的臭氧/陶瓷膜—生物活性炭组合工艺对污水进行深度处理,考察了除污效果以及膜污染控制方式。在臭氧投加量为5 mg/L、陶瓷膜运行通量为80 L/（m²·h）的条件下,臭氧/陶瓷膜单元的处理效果最佳。对比臭氧投加量为5和0 mg/L两种试验工况,臭氧直接作用于陶瓷膜表面能够有效减轻膜污染。在22 h运行期间,臭氧投加量为5 mg/L条件下,跨膜压差比较平稳,而投加量为零时,跨膜压差增加了25 k Pa。3种组合工艺的对比结果表明,臭氧/陶瓷膜—生物活性炭工艺出水水质最好,对COD、COD_Mn、TOC、DOC、UV₂₅₄、色度的去除率分别为53%、63%、44%、38%、71%和100%;其次是臭氧—生物活性炭工艺,相应的去除率分别为39%、41%、30%、30%、56%和84%;最后是陶瓷膜—生物活性炭工艺,去除率分别为35%、41%、27%、21%、51%和85%。臭氧/陶瓷膜—生物活性炭组合工艺存在显著的协同作用,能控制膜污染,提高膜通量,改善处理效果。更多还原

【Abstract】 A pilot-scale study for ozone/ceramic membrane-biological activated carbon（ BAC）combined process was conducted to evaluate the pollutant removal performance and the membrane fouling control for advanced wastewater treatment. The results showed that the treatment efficiency of ozone/ceramic membrane process would be optimal when adding 5 mg/L of ozone and keeping flux at 80 L/（ m²·h）.Moreover,ozonation could alleviate membrane fouling effectively. The transmembrane pressure kept stable during 22 hours operation at the ozone dosage of 5 mg/L. However,the transmembrane pressure would increase by 25 k Pa once ozone dosage was zero. In three combined processes,the effluent quality of ozone/ceramic membrane-BAC was the best,and the removal rates of COD,COD_Mn,TOC,DOC,UV₂₅₄ and chromaticity were 53%,63%,44%,38%,71% and 100% respectively. Followed by ozone-BAC process,the removal rates of the above indicators were 39%,41%,30%,30%,56% and 84%respectively. The removal effect of ceramic membrane-biological activated carbon was the worst,with removal rates of 35%,41%,27%,21%,51% and 85% respectively. There were some synergistic effects in the ozone/ceramic membrane-biological activated carbon,which resulted in alleviation of membrane fouling,higher membrane flux and improved treatment efficiency.更多还原