AI Article Synopsis
- Manures can lead to antibiotic resistance genes (ARGs) that pollute soil and water, posing risks to human health.
- Recent research explored how adding chitosan, compared to zeolite, affects the reduction of antibiotics and ARGs in chicken manure composting.
- Adding chitosan significantly lowered antibiotic levels and ARG abundance, altering bacterial communities and suggesting a new strategy for mitigating ARG risks during composting.
Article Abstract
Manures, storages for antibiotic resistance genes (ARGs), pollute soil and water as well as endanger human health. Recently, we have been searching a better solution to remove antibiotics and ARGs during aerobic composting. Here, the dynamics of chitosan addition on the profiles of 71 ARGs, bacterial communities, chlortetracycline (CTC), ofloxacin (OFX) were investigated in chicken manure composting and compared with zeolite addition. Chitosan addition effectively reduces antibiotics contents (CTC under detection limit, OFX 90.96%), amounts (18) and abundance (56.7%, 11.1% higher than zeolite addition) of ARGs and mobile genetic elements (MGEs) after 42 days composting. Network analysis indicated that a total of 27 genera strains assigned into 4 phyla (Firmicutes, Proteobacteria, Actinobacteria and Bacteroidetes) were the potential hosts of ARGs. Redundancy analysis (RDA) demonstrated that bacterial community succession is the main contributor in the variation of ARGs. Overall, chitosan addition may effect bacterial composition by influencing physic-chemical properties and the concentration of antibiotics, Cu, Zn to reduce the risk of ARG transmission. This study gives a new strategy about antibiotics and ARGs removal from composting on the basis of previous studies.
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| http://dx.doi.org/10.1016/j.scitotenv.2021.148381 | DOI Listing |
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