Abstract
The effects of granules-inocula on the start-up of anaerobic reactors treating dairy manure were studied in a batch-fed reactor. The effects of start-up period and ratio of granules to feed were analyzed. Results indicated that the effects of start-up period could be described by Langmuir model, while the Extended Freundlich model could be used to model the effects of ratio of granules to feed on cumulative biogas production. In addition, transmission electron microscopes (TEM) and scanning electron microscope analysis were conducted to elucidate the distribution of microbial population and micro-colonies in granules and manure. From the TEM micrographs analyses, the ratios the Syntrophobacter and methanogens in granule and manure were shown to be 1.57 +/- 0.42 and 0.22 +/- 0.20, respectively. These results demonstrated that granules-inocula could reduce the period required for onset of biogas by 25%.
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