摘要
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 which is one of the most refractory wastewater because of its poor biodegradability,can hardly satisfy the discharge standard only by biochemical treatment.In this study,microbubble-ozone process and microporeozone process for advanced treatment of the wastewater were compared.The gas holdup,ozone transfer efficiency,and average ozone utilization rate of microbubble-ozone process were 11 times,3 times,and 1.5 times that of micropore-ozone process,respectively.Furthermore,microbubble-ozone process also had much more hydroxyl radicals and higher dissolved ozone concentration,and thus the oxidation ability was stronger.Consequently,organic matters with double bond or with benzene ring were more likely to be oxidized to small molecule organic materials such as olefine acid or carboxylic acid.Therefore,microbubble-ozone process was significantly better than micropore-ozone process based on the removal efficiency of COD,UV254,and NH3-N and biodegradability improvement.
出处
《环境工程》
CAS
CSCD
北大核心
2014年第8期53-58,共6页
Environmental Engineering
基金
北京市自然科学基金(8112021)
关键词
微气泡-臭氧工艺
微孔-臭氧工艺
腈纶废水
microbubble-ozone process
micropore-ozone process
acrylic fiber wastewater
