Enterobactérias em sistemas de tratamento aeróbio de resíduos sólidos orgânicos domiciliares
DOI:
https://doi.org/10.6008/CBPC2179-6858.2021.005.0008Keywords:
Environment, Composting, Bacteria, Solid Waste, Organic compostAbstract
This research aimed to evaluate the presence of enterobacteria in aerobic treatment systems for household solid organic waste. The work was carried out in five stages: contact with families that practice selective collection; structuring and assembly of the experimental area; development and adaptation of technology for aerobic biological treatment of organic solid waste; collection of solid organic residues in homes; treatment of organic solid waste. Two models of treatment technology were adopted: rectangular aluminum composter (CAR) and cylindrical polyethylene composter (CPC). During the treatment it was verified the constant presence of Gram-negative bacteria group of the group of Gram negative bacteria belonging to the Enterobacteriaceae family that persisted until the last stages of composting. This represents a high capacity to adapt to different environmental conditions. Nine genera and fifteen species were identified: Citrobacter (25.9%), Enterobacter (14.1%) Escherichia (11.7%), Klebsiella (5.9%), Morganella (1.2%) Proteus (35.4%), Providencia (1.2%), Serratia (2.3%), Salmonella (2.3%). It was observed that the highest growth rates of enterobacteria occurred in the mesophilic phase. The variations in density and diversity of Enterobacteria followed in line with changes in the physical and chemical characteristics of the substrate during composting. Therefore, according to the data collected, it was found that there is diversity of enterobacteria in the different phases of aerobic treatment of household solid organic waste, correlating with the physical and chemical changes of the substrate.
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