工业废水水质对微气泡臭氧化深度处理影响

Influence of Industrial Wastewater Quality on Advanced Treatment of Microbubble Ozonation

采用微气泡臭氧化深度处理实际制药废水和制革废水,比较处理性能并分析废水水质对处理性能的影响.结果表明,微气泡臭氧化可有效氧化降解实际制药废水和制革废水中主要有机污染物并去除COD,其深度处理COD去除量与臭氧消耗量之比分别为0.77和1.02,同时明显提高可生化性并降低生物毒性.废水中有机污染物类型影响微气泡臭氧化处理性能,制药废水中存在较多难降解复杂芳香族有机污染物,臭氧化降解难度较大,因而微气泡臭氧化深度处理制药废水性能不及制革废水.废水中无机阴离子不利于臭氧气液传质和分解以及·OH产生,进而影响微气泡臭氧化反应效率以及可生化性改善,降低阴离子浓度有助于提高微气泡臭氧化处理性能.

The treatment performance of microbubble ozonation used for advanced treatment of actual pharmaceutical wastewater and tannery wastewater was investigated and compared to show the influence of complicated wastewater quality.The results showed that most organic pollutants in pharmaceutical wastewater and tannery wastewater could be degraded by microbubble ozonation effectively.and COD was removed simultaneously.In addition,the biodegradability was improved and the bio-toxicity was eliminated significantly.The ratios of COD amount removed and ozone amount consumed were 0.77 and 1.02,respectively,in such advanced treatment of pharmaceutical wastewater and tannery wastewater,indicating different ozone oxidation efficiencies between pharmaceutical wastewater and tannery wastewater.The main types of organic pollutants in pharmaceutical wastewater and tannery wastewater were determined by GC-MS and 3 D-EEM,which showed the influence on treatment performance of microbubble ozonation.More refractory complex aromatic organic pollutants were found in pharmaceutical wastewater,which seemed more difficult to undergo degradation by microbubble ozone oxidation.As a result,the microbubble ozone oxidation of pharmaceutical wastewater was less efficient than that of tannery wastewater.The inorganic anions in both kinds of wastewater were unfavorable for ozone mass transfer,ozone decomposition,and·OH generation,which reduced the reaction efficiency of microbubble ozonation as well as biodegradability improvement.The lower concentrations of inorganic anions were better for microbubble ozonation.