municipal landfill
Recently Published Documents


TOTAL DOCUMENTS

383
(FIVE YEARS 70)

H-INDEX

44
(FIVE YEARS 4)

2022 ◽  
Vol 423 ◽  
pp. 127146
Author(s):  
Qianqian Jin ◽  
Danyang Tao ◽  
Yichun Lu ◽  
Jiaji Sun ◽  
Chun Ho Lam ◽  
...  

Author(s):  
Ingrid Dávalos-Peña ◽  
Rosa Fuentes-Rivas ◽  
Reyna Fonseca-Montes de Oca ◽  
José Ramos-Leal ◽  
Janete Morán-Ramírez ◽  
...  

Sanitary landfills are considered one of the main sources of contamination of water resources due to the generation of leachate with a high content of dissolved organic matter (DOM), inorganic material, and toxic elements. This study aimed to determine the influence of leachate on the physicochemical quality and hydrogeochemical processes which determine the chemical composition of groundwater in an area near a municipal sanitary landfill site. In situ parameters (pH, temperature, electrical conductivity, dissolved oxygen, ORP), physicochemical parameters (HCO3−, PO43−, Cl−, NO3−, SO42−, NH4+, Ca2+, Mg2+, Na+, K+), and dissolved organic matter were analyzed. The content of dissolved organic matter (DOM) was determined by 3D fluorescence microscopy. The presence of Cl−, NO3−, NH4+, PO43−, BOD, and COD indicated the presence of contamination. The significant correlation between NO3− and PO43− ions (r = 0.940) and DOM of anthropogenic origin in the 3D fluorescence spectra confirm that its presence in the water is associated with the municipal landfill site in question. The type of water in the area is Mg-HCO3, with a tendency to Na-HCO3 and Na-SO+-Cl. The water-rock interaction process predominates in the chemical composition of water; however, significant correlations between Na+ and Ca2+ (r = 0.876), and between K+ and Mg2+ (r = 0.980) showed that an ion exchange process had taken place. Likewise, there is enrichment by HCO3− and SO42− ions due to the mineralization of the organic matter from the leachate. The groundwater quality that supplies the study area is being affected by leachate infiltration from the sanitary landfill.


Author(s):  
Anjali Bhagwat ◽  
Rajat Kumar ◽  
Chandra Shekhar Prasad Ojha ◽  
Mukesh Kumar Sharma ◽  
Apourv Pant ◽  
...  

Author(s):  
Rebecca Co ◽  
Laura A Hug

Abstract Landfills are engineered, heterogeneously contaminated sites containing large reservoirs of paper waste. Cellulose degradation is an important process within landfill microbial ecology, and these anoxic, saturated environments are prime locations for discovery of cellulases that may offer improvements on industrial cellulose degradation efforts. We sampled leachate from three locations within a municipal landfill, a leachate collection cistern, and groundwater from an adjacent aquifer to identify cellulolytic populations and their associated cellulases. Metagenomic sequencing identified wide-spread and taxonomically diverse cellulolytic potential, with a notable scarcity of predicted exocellulases. 16S rRNA amplicon sequencing detected nine landfill microorganisms enriched in a customized leachate medium amended with microcrystalline cellulose or common paper stocks. Paper-enrichment cultures showed three competition dynamics in response to the specific composition (lignin: hemi-cellulose: cellulose) of the different paper stocks. From leachate biomass, four novel cellulolytic bacteria were isolated, including two with the capacity for cellulolysis at industrially-relevant temperatures. None of the isolates demonstrated exocellulase activity, consistent with the metagenome-based predictions. However, there was very little overlap between metagenome-derived predicted cellulolytic organisms, organisms enriched on paper sources, or the isolates, suggesting the landfill cellulolytic community is at low abundance but able to rapidly respond to introduced substrates.


2021 ◽  
Vol 54 ◽  
pp. 102202
Author(s):  
Adriana Ciurli ◽  
Letizia Modeo ◽  
Alberto Pardossi ◽  
Carolina Chiellini

Sign in / Sign up

Export Citation Format

Share Document