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石化行业产生的腈纶废水是难降解难处理的有机废水之一,经生化工艺处理后均不满足排放要求。比较了微气泡-臭氧工艺和微孔-臭氧工艺对该废水进行深度处理的效果,并对其降解机理进行了分析。结果表明:在COD、UV254、NH3-N的去除及废水可生化性提高方面,微气泡-臭氧工艺优于微孔-臭氧工艺。微气泡-臭氧体系的气含率、臭氧传质系数和臭氧平均利用率分别是微孔-臭氧体系的11倍、3倍和1.5倍,特别是微气泡-臭氧体系的羟基自由基数量和溶解性臭氧浓度均高于微孔-臭氧体系,即前者的氧化能力更强,使含双键和苯环类物质更多地氧化成烯酸、羧酸等小分子有机物,从而改善废水的可生化性。
Acrylic fiber wastewater generated by the petrochemical industry is one of the most difficult organic wastewater to be hard to be degraded. After being treated by biochemical processes, it does not meet the emission requirements. The effects of micro-bubble-ozone process and micropore-ozone process on the wastewater treatment were compared, and the degradation mechanism was analyzed. The results show that micro-bubble-ozone process is better than micro-pore-ozone process in the removal of COD, UV254 and NH3-N and the improvement of wastewater biodegradability. The gas holdup, the ozone mass transfer coefficient and the average ozone utilization of the microbubble-ozone system are 11 times, 3 times and 1.5 times that of the micropore-ozone system, respectively. In particular, the number of hydroxyl radicals and the dissolution of the microbubble-ozone system The ozone concentration is higher than that of the micropore-ozone system, that is, the former has stronger oxidizing ability, so that the double bond and benzene ring-containing substances are more oxidized into small molecule organic substances such as enoic acid and carboxylic acid so as to improve the biodegradability of the wastewater Sex.