Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 304, Issue -, Pages 343-351Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2015.10.057
Keywords
Antibiotic resistance genes; Treatment performance; Granular sequencing batch reactor; Microbial aggregates; Granule size
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Funding
- National Natural Science Foundation of China [51408604, 51108456]
- Tianjin Research Program of Application Foundation and Advanced Technology [15JCZDJC40300]
- National High Technology Research and Development Program of China [2009AA06Z312]
- Science and Technology Program of Tianjin [11JCYBJC14700]
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Antibiotic resistance genes (ARGs) have emerged as key factors in wastewater environmental contaminants and continue to pose a challenge for wastewater treatment processes. With the aim of investigating the performance of granular sludge system when treating wastewater containing a considerable amount of ARGs, a lab-scale granular sequencing batch reactor (GSBR) where flocculent and granular sludge coexisted was designed. The results showed that after inoculation of donor strain NH4+-N purification efficiency diminished from 94.7% to 32.8% and recovered to 95.2% after 10 days. Meanwhile, RP4 plasmid had varying effects on different forms of microbial aggregates. As the size of aggregates increased, the abundance of RP4 in sludge decreased. The residence time of RP4 in granules with particle size exceeding 0.9 mm (14 days) was far shorter than that in flocculent sludge (26 days). Therefore, our studies conclude that with increasing number of ARGs being detected in wastewater, the use of granular sludge system in wastewater treatment processes will allow the reduction of ARGs transmissions and lessen potential ecological threats. (C) 2015 Elsevier B.V. All rights reserved.
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