The role of media type on the performance of the moving bed biofilm reactor in removal of ۴-nitrophenol from wastewater

Oily pollutants, such as ۴-nitrophenol, are unavoidable problems. One of the methods employed for treating wastewater polluted with ۴-nitrophenol is the use of moving bed biofilm reactors (MBBRs). The present research compared, for the first time, the two common types of media (Kaldness K۱ and Bee Cell ۲۰۰۰) in MBBR for treating wastewater polluted with ۴-nitrophenol, and determined and reported the optimum conditions for media types and heat. A biofilm layer was first formed on the surface of the media in each reactor, and then the microorganisms were acclimatized to the contaminants. Following that, changes in efficiency with variations in initial COD concentration (۴۰۰-۲,۵۰۰ mg/l), retention time (۸, ۱۲, ۲۴, and ۴۸ h), and filling ratio (۳۰, ۵۰, and ۷۰ %) in the two reactors were determined and compared. The highest efficiencies (۸۴ and ۸۰ percent for the reactor with Bee Cell ۲۰۰۰ media and that with Kaldness K۱ media, respectively) were observed. Both reactors containing Bee Cell ۲۰۰۰ media and Kaldness K۱ media were very capable of treating wastewater polluted with ۴-nitrophenol at ۲۰ °C. Still, the reactor that included the Bee Cell ۲۰۰۰ media yielded better results compared to that containing the Kaldness K۱ media.

کلیدواژه ها:

Petroleum pollutant ، ۴-nitrophenol ، Retention time ، moving bed biofilm reactor ، media type