AI Article Synopsis
- Thermophilic aerobic digestion (TAD) effectively reduced the levels of antibiotic resistance genes (ARGs), heavy metal resistance genes (HMRGs), and class 1 integrons (intI1) in sludge, showing no increase in these genes after treatment.
- The study found very low residual levels of intI1 (0.03) and total ARGs (0.08) after TAD, indicating efficient removal.
- The relative abundance of human bacterial pathogens decreased significantly post-TAD, suggesting this method could reduce biological risks associated with sewage sludge.
Article Abstract
Thermophilic aerobic digestion (TAD) was applied to further reduce ARGs and heavy metal resistance genes (HMRGs) as well as class 1 integrons (intI1) in sludge from anaerobic digestion (AnD). Unlike after AnD, there was no enrichment of ARGs, HMRGs and intI1 after TAD. Residual gene fractions of intI1 and total ARGs (sum of targeted ARGs) were 0.03 and 0.08, respectively. Two kinetic models (Collins-Selleck and first-order) described the decay patterns of targeted genes, revealing rapid removal of intI1 during TAD. After TAD, the relative abundance of human bacterial pathogens (HBPs) and the numbers of HBPs species decreased to approximately 68% and 64% compared to anaerobically digested sludge, respectively. Thus, TAD, subsequent to AnD, may possess high potential for reducing biological risks resulting from ARGs, HMRGs, intI1 and HBPs in sewage sludge.
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| http://dx.doi.org/10.1016/j.biortech.2018.11.027 | DOI Listing |
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