Degradation of 4-Nitrophenol Using a Coupled Photocatalytic-Biological Aerated Filter Process

作者：Huang Donggen^*; Zhang Feng; Tu Zhibin; Yang Qing; Quan Shuiqing; Liu Lei

来源：Environmental Engineering Science, 2011, 28(10): 677-685.

DOI：10.1089/ees.2010.0039

• photocatalysis
• pretreatment
• biological aerated filter
• degradation
• 4-nitrophenol

4-Nitrophenol (4-NP) was degraded using a coupled photocatalytic-biological aerated filter (BAF) process. Effects of different initial 4-NP concentrations on its degradation by using solo photocatalytic oxidation or BAF process are discussed. Degradation efficiency of 4-NP using BAF process after a short-duration photocatalytic pretreatment (PC) were studied in detail. Intermediates of 4-NP degradation were characterized by UV-vis spectrophotometry, high-performance liquid chromatography, high-performance liquid chromatography/mass spectrometry, and ion chromatography. Possible mechanisms of 4-NP degradation using photocatalytic-BAF process were discussed. Short-duration PC was used to decrease chemical oxygen demand and improve biodegradability of 4-NP. It was found that PC of 4-NP for 2.5 h, during which period about 20%-50% chemical oxygen demand removal occurred, could be coupled to second-stage biological treatment for achieving enhanced biodegradation of 4-NP. The as-prepared N-TiO(2)/gamma-Al(2)O(3) granules were used as photocatalyst, photocatalytic-BAF technique was used to degrade 4-NP, and then the catalyst separated from wastewater automatically after photoreaction, which addressed the problem of in catalyst separation. Results indicated that this comprehensive process was simple and effective for the treatment of this typical nonbiodegradable nitrophenols wastewater.

• 出版日期2011-10
• 单位南昌大学