Journal
BIORESOURCE TECHNOLOGY
Volume 258, Issue -, Pages 135-141Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2018.03.005
Keywords
Antibiotic resistance genes; Swine manure; Anaerobic digestion; Heavy metal resistance genes; Additives
Funding
- National Major Science & Technology Projects for Water Pollution Control and Management of China [2015ZX07203-007]
- State Key Joint Laboratory of Environmental Simulation and Pollution Control of China [16Z04ESPCR]
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This study investigated the fate of antibiotic resistance genes (ARGs) during mesophilic (mAD) and thermophilic digestion (tAD) of swine manure through zero valent iron (ZVI), natural zeolite and Dnase addition. Changes of microbial community, intI1, heavy metal resistance genes (MRGs) and virulence factors (VFs) were followed to clarify the influencing factors to ARGs reduction. Results showed that AD could realize ARGs reduction with tAD superior to mAD, and ZVI and natural zeolite could further enhance the reduction, especially for natural zeolite addition at mAD. The reduction efficiency of the relative abundance of ARGs was increased by 33.3% and 138.5% after ZVI and natural zeolite addition, respectively, but Dnase deteriorated ARGs reduction at mAD. Most of ARGs could be reduced effectively except sulII and tetM. Network analysis and partial redundancy analysis indicated that co-occurrence of MRGs followed by microbial community contributed the most to the variation of ARGs fate among treatments.
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