Implications for mitigation of antibiotic resistance: Differential response of intracellular and extracellular antibiotic resistance genes to sludge fermentation coupled with thermal hydrolysis

Cai, Chen; Hui, Xuesong; Yang, Wan; Yu, Hua; Liu, Huiling; Dai, Xiaohu

doi:10.1016/j.watres.2021.117876

Cited by 27 publications

(1 citation statement)

References 62 publications

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“…Excess sludge containing high organic matter contents is a poorly utilized resource (Fang et al, 2020). Indeed, sludge fermentation products, obtained through appropriate operation, generally contain abundant short‐chain fatty acids (SCFAs) (Bahreini et al, 2020; Zheng et al, 2013), which could be used as an alternative source of organic carbon to enhance nutrient removal rates (Cai et al, 2021; Xu et al, 2022). Several authors have demonstrated excellent biological nutrient removal performances and sludge reduction following the addition of sludge fermentation products (Huang et al, 2020; Li et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Advanced nutrient removal and external sludge reduction: Demonstration in a pilot‐scale sequencing batch reactor

Yang

Chang

Peng

et al. 2023

Water Environment Research

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Although the addition of excess sludge fermentation products to improve nutrient removal from sewage is cost‐effective, its application has rarely been demonstrated. In this study, the external sludge was first collected and fermented under a sludge retention time of 10 days, then introduced into SBR with a 1:15 sewage ratio. The results revealed a gradual increase in the nitrite accumulation ratio to 34.7% in the SBR at the end of the oxic stage after 64 days of adding fermented sludge products. In addition, the average effluent total nitrogen and phosphorous decreased to 7.3 and 0.5 mg/L, corresponding to removal efficiencies of 86.7% and 95.5%, respectively. On the other hand, the use of the fermented sludge products as external organic carbon sources in the SBR increased the external sludge reduction ratio to 42.5%. High‐throughput sequencing demonstrated that the increase in the endogenous denitrifier community, polyphosphate‐accumulating organisms, and fermentation bacteria were the main factors contributing to the increase in nutrient removal and excess sludge reduction. The economic evaluation indicated that the operational cost of the pilot‐scale system saves 0.011$/m3 of sewage treated. Practitioner Points Fermented sludge addition effectively enhanced nutrient removal in pilot‐scale SBR. Average effluent TN and PO43−–P decreased to 7.3 and 0.5 mg/L, respectively. Highest external sludge reduction rate was 42.5% in pilot‐scale reactor. Sewage treatment cost can save 0.011$/m3 under advanced nutrient removal.

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