4.7 Review

Antibiotic resistance genes and heavy metals in landfill: A review

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Impact of different organic matters on the occurrence of antibiotic resistance genes in activated sludge

Xiuwen Zhang et al.

Summary: This study investigated the impact of adding different organic pollutants on the occurrence of antibiotic resistance genes (ARGs) in activated sludge. The results showed that antibiotics not only increased the abundance of ARGs, but also significantly changed their compositions. Gram-negative bacteria were found to be the main carriers of ARGs, and significant co-occurrence relationships between ARGs and mobile genetic elements were observed in the sludge samples.

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Antibiotic degradation dominates the removal of antibiotic resistance genes during composting

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Summary: Analyzing the impact of composting on antibiotic resistance genes (ARGs) and their hosts, the study found that antibiotics directly affected horizontal gene transfer (HGT) while temperature indirectly influenced HGT through antibiotic degradation. BacA was associated only with hosts involved in vertical gene transfer (VGT), potentially explaining its low removal rate.

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Microbes drive changes in arsenic species distribution during the landfill process

Lifang Hu et al.

Summary: This study utilized random matrix theory to construct microbial networks at different stages of landfill ages, showing that landfill age affects network size and microbial structure. About 208 key taxa were identified as keystones for landfill, with Random Forest analysis determining 17, 10 and 14 keystone taxa influencing As species distribution at early, middle, and later landfill stages.

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Mobility and environmental fate of heavy metals in fine fraction of dumped legacy waste: Implications on reclamation and ecological risk

Ayush Singh et al.

Summary: The study evaluated the mobility and chemical speciation of heavy metals in fine fraction collected from a municipal solid waste dumpsite in Mumbai, India. Results showed an increasing trend in heavy metal concentration with waste age, with zinc having the highest concentration. Cadmium was identified as the most polluting and mobile heavy metal, while chromium had the least mobility.

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Article Engineering, Environmental

Mechanisms of the effects of humic acid on antibiotic resistance genes and microbial communities in Cd-contaminated soils

Yanli Fu et al.

Summary: This study investigated the effects of Cd and HA on ARGs, MGEs, and bacterial communities in soil. The results showed that the addition of Cd increased the abundance of ARGs and MGEs, while high concentrations of HA suppressed their expression. Available Cd was found to be the dominant factor influencing ARGs, and Proteobacteria were identified as the main host bacteria. Therefore, adding high concentrations of humic acid to Cd-contaminated soil can reduce the enrichment of ARGs.

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The panorama of antibiotics and the related antibiotic resistance genes (ARGs) in landfill leachate

Hongyuan Liu et al.

Summary: Landfill leachate is a significant source and recipient of antibiotics and antibiotic resistance genes. The composition and concentration of these compounds are influenced by factors such as leachate age, seasonal variation, heavy metal concentrations, and leachate quality parameters.

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Antibiotic resistance genes in landfill leachates from seven municipal solid waste landfills: Seasonal variations, hosts, and risk assessment

Yangqing Wang et al.

Summary: This study reveals the presence of abundant antibiotics and antibiotic resistance genes in landfills and landfill leachate, posing a significant threat to the environment. The study focuses on the seasonal variation of three specific antibiotic resistance genes (sulI, tetO, and tetW) in Chinese municipal solid waste landfill leachates over two years. The study also identifies the bacterial hosts of these resistance genes and evaluates their risk levels. The results demonstrate the high health risk associated with antibiotic resistance in landfills, particularly in genes that are abundant in the human-associated environment, have gene mobility, and possess pathogenicity.

SCIENCE OF THE TOTAL ENVIRONMENT (2022)

Article Engineering, Environmental

Dissemination of antibiotic resistance genes from landfill leachate to groundwater

Fu-Yi Huang et al.

Summary: This study identifies landfill leachate as an important source of antibiotic resistance genes (ARGs) that can penetrate and spread into nearby groundwater. Heavy metals, bacterial community, and mobile genetic elements (MGEs) were found to be the driving factors shaping the patterns of ARGs in water samples, explaining 57% of their variations.

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Bioavailability of potentially toxic elements influences antibiotic resistance gene and mobile genetic element abundances in urban and rural soils

Katie Robins et al.

Summary: The prevalence of antibiotic resistance genes (ARGs) in rural and urban soils is influenced by exposure to potentially toxic elements (PTEs). Urban soils have higher abundances of ARGs and concentrations of PTEs compared to rural soils.

SCIENCE OF THE TOTAL ENVIRONMENT (2022)

Article Engineering, Environmental

Accelerated spread of antibiotic resistance genes (ARGs) induced by non-antibiotic conditions: Roles and mechanisms

Xingdong Shi et al.

Summary: This study investigates the role and mechanisms of non-antibiotic chemicals and environmental factors in the spread of antibiotic resistance genes (ARGs). The results suggest that the impact of antibiotics has been overestimated, while non-antibiotic chemicals and conditions have important influences on ARG dissemination.

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Natural organic matters promoted conjugative transfer of antibiotic resistance genes: Underlying mechanisms and model prediction

Hu Li et al.

Summary: This study reveals the underlying mechanisms for promoting the transfer of antibiotic resistance genes (ARG) by natural organic matter (NOM). Experimental exploration and model prediction demonstrate that NOM with a lower molecular weight and higher concentration can increase the conjugative transfer frequency and maintenance time of plasmids, thereby enhancing the transfer of ARG.

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Distribution and speciation of Sb and toxic metal(loid)s near an antimony refinery and their effects on indigenous microorganisms

Soo-Chan Park et al.

Summary: Although the effects of Sb contamination on surrounding environments and indigenous microorganisms have been studied, the impact of co-contamination of Sb and toxic metal(loid)s remains poorly understood. High Sb levels were found in topsoil samples near the refinery, while high concentrations of As and Pb, along with extremely high Sb contents, were observed in soil samples taken from greater depths near the landfill site. The study also suggested that microbial community compositions were significantly different in samples with high toxic metal(loid)s concentrations, with lower microbial populations, and that Pb may play a major role in controlling microbial community compositions at the site.

JOURNAL OF HAZARDOUS MATERIALS (2021)

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Selective enrichment of antibiotic resistance genes and pathogens on polystyrene microplastics in landfill leachate

Jianhong Shi et al.

Summary: This study found that antibiotic resistance genes (ARGs) on polystyrene microplastics (MPs) were selectively enriched, closely associated with MPs, and pathogens in the surrounding environment were also enriched on MPs. The presence of MPs did not significantly affect the abundances of ARGs, MGEs, and bacterial communities in the surrounding leachate within 60 days.

SCIENCE OF THE TOTAL ENVIRONMENT (2021)

Article Environmental Sciences

Antibiotic resistance contamination in four Italian municipal solid waste landfills sites spanning 34 years

Pinjing He et al.

Summary: This study investigated antibiotic resistance in leachate samples from municipal solid waste landfills in north Italy spanning 34 years, revealing the presence of antibiotics and antibiotic resistance genes. Despite some antibiotics being banned or restricted in Italy, they were still detected in landfills, indirectly contributing to the long-term contamination of antibiotic resistance genes. The complexity of antibiotic resistance in leachate was found to be related synthetically to antibiotics, metals, microbes, and mobile genetic elements, with certain substances positively influencing the contamination of specific antibiotic resistance genes.

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Antibiotic and metal resistance genes are closely linked with nitrogen-processing functions in municipal solid waste landfills

Panliang Wang et al.

Summary: The presence of antibiotic and metal resistance genes in landfill environments is closely related to the concentrations of antibiotics and metals, as well as environmental factors such as nitrogen content. Dominant antibiotic and heavy metal resistance genes show significant correlation with environmental factors like nitrate and pH. The majority of sequenced resistance genes and nitrogen processing genes are hosted by specific bacterial species in leachates, indicating a complex interaction between genes and environmental conditions.

JOURNAL OF HAZARDOUS MATERIALS (2021)

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Effects of landfill refuse on the reductive dechlorination of pentachlorophenol and speciation transformation of heavy metals

Hong-Bao Liu et al.

Summary: The study found that landfill refuse contains a variety of active functional groups, with electron donating capacity higher than electron accepting capacity, mainly achieved through hydroxyl groups; Inorganic minerals and speciation distribution of heavy metals in the refuse were affected, with zinc and nickel showing high migration potential, while chromium, copper, and lead are relatively stable.

SCIENCE OF THE TOTAL ENVIRONMENT (2021)

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Evaluating the physicochemical properties of refuse with a short-term landfill age and odorous pollutants emission during landfill mining: A case study

Ya-nan Wang et al.

Summary: The study found that the chemical properties and physical composition of refuse change with the landfill age, and fresh refuse is more suitable for incineration treatment; the emissions of ammonia and carbon disulfide from 1-2 year-old refuse with high volatile content and calorific value were more significant. Under the conditions of small-scale cleaning and continuous reduction of odor emissions, the pollution intensity can meet the emission standards.

WASTE MANAGEMENT (2021)

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Leaching characteristics of heavy metals in MSW and bottom ash co-disposal landfills

Qian Wang et al.

Summary: The co-disposal of bottom ash affects the leaching behavior of heavy metals in landfills, with concentrations decreasing over time. Leached metals include Zn, Cu, Mn, Pb, Cr, and Cd. The discharge concentration ratio of heavy metals in the leachates follows the order: MSW > BA_L > BA_H > BA.

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Antibiotic resistance genes are enriched with prolonged age of refuse in small and medium-sized landfill systems

Zaiming Chen et al.

Summary: The abundance of antibiotic resistant genes (ARGs) in refuse from landfills increases significantly with the age of the landfill, indicating a potential risk of ARG enrichment in landfill environments.

ENVIRONMENTAL RESEARCH (2021)

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Aged landfill leachate enhances anaerobic digestion of waste activated sludge

Meng Gao et al.

Summary: Anaerobic digestion (AD) is a sustainable method for recovering energy from organic wastes, but the efficiency for waste activated sludge (WAS) is limited due to WAS hydrolysis constraints. This study proposes a strategy to treat WAS and landfill leachate simultaneously, aiming to enhance WAS hydrolysis and organic conversion to methane. The effects of landfill leachate on the different stages of AD of WAS were investigated, showing that appropriate amounts of leachate can promote solubilization, hydrolysis, and acidogenesis, but not methanogenesis. Mechanism studies revealed the beneficial effects of humic acid in leachate on hydrolysis and acidogenesis, and the dose-dependent effects of heavy metals on the AD process. Additionally, microbial community analysis showed an increase in microbes responsible for hydrolysis and acidogenesis with the presence of landfill leachate.

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Diversity, abundance and expression of the antibiotic resistance genes in a Chinese landfill: Effect of deposit age

Sai Xu et al.

Summary: This study assessed the diversity, abundance, and expression of antibiotic resistance genes (ARGs) in a Chinese landfill using high-throughput quantitative PCR. The results showed that the total abundance of ARG transcripts was significantly higher in young refuse compared to old refuse, with heavy metals being the major driver affecting the profile of ARGs. These findings provide new insights into the potential threats posed by ARGs in landfills.

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A systematic review of antibiotics and antibiotic resistance genes in estuarine and coastal environments

Dongsheng Zheng et al.

Summary: This article discusses the sources, spatial patterns, driving factors, and environmental implications of antibiotics and antibiotic resistance genes (ARGs) in global estuarine and coastal environments. Pollution due to antibiotics is higher in low- and middle-income countries than in high-income countries, and ARGs show remarkable latitudinal variations.

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Metagenomics Analysis Reveals the Microbial Communities, Antimicrobial Resistance Gene Diversity and Potential Pathogen Transmission Risk of Two Different Landfills in China

Shan Wan et al.

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