The degradation of LAE (linear alcohol ethoxylate) for aerobic treatment systems has been extensively studied. However, this removal of LAE is due probably to the phenomena of degradation and sorption on biological sludge. Only a few studies on the degradation of LAE in anaerobic conditions. In Brazil, recent research has been conducted in the LPB-EESC-USP with horizontal anaerobic fixed bed and fluidized bed reactor fed with synthetic wastewater and LAS (linear alkylbenzene sulfonate). Thus, the motivation of this work lies in the possibility to evaluate the removal and degradation of LAE, through the application of current technology and efficient. In this paper, we studied the anaerobic degradation of LAE in anaerobic fluidized bed reactor in a bench scale (1.2 L) filled with sand as support material and operated continuously. The reactor is inoculated with sludge from a UASB reactor used in the treatment of effluent and swine manure is fed with synthetic substrate plus LAE. Microscopic examination will be conducted to assess the microbial growth support medium. Physic-chemical and chromatographic routine monitoring will be carried out in reactor. Changes in the concentration of LAE present in synthetic wastewater define the stages of reactor operation. Phases of stabilization, at the end of each stage of reactor operation, samples of the biofilm will be to identify cell using sequences of rRNA 16S. Through this experiment we intend, at the end of the work, indicate the alternative anaerobic technology for the removal of LAE, and especially to identify populations of the biofilm.
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