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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Microbial structure and diversity in non-sanitary landfills and association with physicochemical parameters

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Author(s):
Morita, Alice Kimie Martins [1] ; Sakamoto, Isabel Kimiko [1] ; Varesche, Maria Bernadete Amancio [1] ; Wendland, Edson [1]
Total Authors: 4
Affiliation:
[1] Univ Sao Paulo, Sao CarlosSch Engn EESC, Ave Trabalhador Sao Carlense 400, BR-13566590 Sao Carlos, SP - Brazil
Total Affiliations: 1
Document type: Journal article
Source: Environmental Science and Pollution Research; JUL 2020.
Web of Science Citations: 0
Abstract

This study assessed the bacterial populations in a non-sanitary landfill around Guarani Aquifer recharge zone in Brazil. Samples from two different positions (sites 1 and 2) at three different depths were evaluated, totaling six solid waste samples; two samples from an impacted stream were also collected. 16S rRNA sequencing was performed using the Ion S5TM XL platform; 3113 operational taxonomic units (OTUs) and 52 phyla were identified. Proteobacteria (37%) and Firmicutes (28%) were the most abundant phyla in the landfill, whereas Proteobacteria (similar to 50%) and Bacteroidetes (similar to 10%) were more profuse in surface water samples. Canonical correlation analysis (CCA) enabled us to clearly separate the samples according to their spatial location (site 1 or 2) or environmental matrix (surface water or solid waste samples), showing that microbiological populations are strongly associated with site-specific conditions and the kind of environmental matrix they come from. Environmental factors that mostly influenced the microbial communities were organic matter, oxidation-reduction potential, moisture, alkalinity, nitrogen (TKN), sodium, potassium, and zinc. Exiguobacterium (phylum Firmicutes) was overwhelmingly dominant at site 1 and was associated with higher concentrations of organic matter and potassium. Differently, site 2 did not present such dominant genera and was more diverse having lower concentrations of organic matter and nutrients. Distinct environments co-exist inside the same waste deposit, including zones which are representative of active and closed landfills and the occurrence of considerable physicochemical and microbiological shifts within short distances. Those shifts indicate that microbial populations are well adapted to the heterogeneity typical of urban solid waste, which is possibly beneficial to contaminant degradation. (AU)

FAPESP's process: 15/03806-1 - Water availability and quality threats in a Guarani Aquifer System outcrop zone
Grantee:Edson Cezar Wendland
Support type: Program for Research on Bioenergy (BIOEN) - Thematic Grants
FAPESP's process: 18/24615-8 - Effects of partial capping in the contaminants mobilization and microbial degradation in a closed waste deposit
Grantee:Alice Kimie Martins Morita
Support type: Scholarships in Brazil - Doctorate