Bacterial diversity associated with biodegradation of urban solid waste

ABSTRACT

The knowledge of bacterial populations responsible for the biodegradation of solid waste disposed of in landfills can lead to the development of feasible technological alternatives for the treatment and stabilization of residues, resulting in positive impacts for the operation of landfills, energy recovery, public health and the environment. The objective of this work is to characterize the bacterial diversity associated to the biodegradation of grounded MSW in an experimental Cell in the city of Campina Grande-PB. The study covered the stages of construction, statistical planning of the districts of Campina Grande-PB for collection and filling of the experimental Cell with MSW. The DNA samples of the bacteria found in the MSW were extracted with the Power Soil DNA Isolation Kit, then the genetic analysis was performed with universal primers for bacteria via PCR and DGGE, and finally, genetic sequencing (16S RNA region). Following the microbiological examination, the main bacteria associated to the taxons were: Uncultured Pseudomonas sp, Uncultured bacterium, Enterobacter sp., Klebsiella pneumoniae, Uncultured Bacillus sp., suggesting that in the MSW there are still unknown and/or non-isolated representatives that are related to hydrolysis, acidogenesis and acetogenesis in the anaerobic digestion of the residues.

Keywords:
municipal solid waste; biodegradation; bacteria