Impact of anaerobic digestion and centrifugation/decanting processes in bacterial communities fractions

Journal of Bioscience and Bioengineering
Ana Isabel DíazMario Díaz

Abstract

Sewage sludge can be treated by anaerobic processes that frequently are followed by physical separation processes. In this work, a high-throughput sequencing technology, based on variation in the bacterial 16S rRNA gene, has been used to characterise the bacterial populations present in samples taken from different points of an industrial anaerobic digestion process fed with sewage sludge. Relative abundances of phyla and classes throughout the biological process and the subsequent separation steps were determined. Results revealed that the Bacteroidetes, Firmicutes and Proteobacteria phyla were the most representative. However, significant changes in relative abundance were detected along treatments, showing the influence of operational parameters on the distribution of microorganisms throughout the process. After anaerobic digestion, phylum Firmicutes doubled its relative abundance, which seems to indicate that the anaerobic conditions and the nutrients favoured its growth, in contrast to other phyla that almost disappeared. After centrifugation, Proteobacteria went preferentially to the solid phase, in contrast to Firmicutes which was the dominant phylum in the liquid phase. After decanting the liquid phase during 45 h, an i...Continue Reading

Citations

Nov 12, 2020·Journal of Bioscience and Bioengineering·Elvira E ZiganshinaAyrat M Ziganshin
Aug 18, 2020·Journal of Environmental Management·Ana Isabel DíazMario Díaz

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