By the same authors

From the same journal

Horizontal gene transfer and shifts in linked bacterial community composition are associated with maintenance of antibiotic resistance genes during food waste composting

Research output: Contribution to journalArticle

Author(s)

  • Hanpeng Liao
  • Ville-Petri Friman
  • Stefan Geisen
  • Qian Zhao
  • Peng Cui
  • Xiaomei Lu
  • Zhi Chen
  • Zhen Yu
  • Shungui Zhou

Department/unit(s)

Publication details

JournalScience of the Total Environment
DateAccepted/In press - 23 Dec 2018
DateE-pub ahead of print - 26 Dec 2018
DatePublished (current) - 10 Apr 2019
Volume660
Number of pages10
Pages (from-to)841-850
Early online date26/12/18
Original languageEnglish

Abstract

About 1.3 billion tons of food waste (FW) is annually produced at a global scale. A major fraction of FW is deposited into landfills thereby contributing to environmental pollution and emission of greenhouse gasses. While increasing amounts of FW are recycled more sustainably into fertilizers in industrial-scale composting, very little is known about the antibiotic resistance genes (ARGs) present in FW and how their abundance is affected by composting. To study this, we quantified the diversity and abundance of ARGs, mobile genetic elements (MGEs) and bacterial communities in the beginning, during and at the end of the FW composting. All targeted 27 ARGs and 5 MGEs were detected in every sample suggesting that composted FW remains a reservoir of ARGs and MGEs. While the composting drastically changed the abundance, composition and diversity of bacterial communities, an increase in total ARG and MGE abundances was observed. Changes in ARGs were linked with shifts in the composition of bacterial communities as revealed by a Procrustes analysis (P < 0.01). Crucially, even though the high composting temperatures reduced the abundance and diversity of initially ARG-associated bacterial taxa, ARG abundances were maintained in other associated bacterial taxa. This was likely driven by horizontal gene transfer and physicochemical composting properties as revealed by a clear positive correlation between ARGs, MGEs, pH, NO 3 and moisture. Together our findings suggest that traditional composting is not efficient at removing ARGs and MGEs from FW. More effective composting strategies are thus needed to minimize ARG release from composted FW into agricultural environments.

Bibliographical note

This is an author-produced version of the published paper. Uploaded in accordance with the publisher’s self-archiving policy.

    Research areas

  • Antibiotic resistance genes, Bacterial community composition, Composting physicochemical parameters, Mobile genetic elements, Municipal solid waste

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