Elimination of antibiotic resistance genes in waste activated sludge by persulfate treatment during the process of sludge dewatering. (September 2020)

• Record Type: Journal Article
• Authors: Duan, Wan-Jun; Gao, Jing-Feng; Zhang, Wen-Zhi; Wang, Yu-Wei; Liu, Jie
• Is Part Of: Bioresource technology. Volume 311(2020)
• Publication Date: 2020-09
• Subjects: Persulfate treatment -- Ginkgo biloba L. leaf modified nanoscale zero-valent iron -- Dewatering of waste activated sludge -- Antibiotic resistance genes -- Regeneration -- Bacterial community structure; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2020.123509
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: PT could remove ARGs from sludge and water phase and achieve WAS dewatering. SRF value of WAS decreased from 1.04 × 10 8 to 6.47 × 10 6 m/kg after PT for 9 min. Abundances of genes decreased 2-4/3-6 orders of magnitude in sludge/water phase. No regeneration of ARGs and MGEs was observed in treated samples incubated for 36 h. In sludge and water, impact on ARGs decreased as following: bacteria > time > SRF. Abstract: Two sludge conditioning modes (nanoscale zero valent iron modified by Ginkgo biloba L. leaf (G-nZVI)/sodium persulfate (PS) conditioning with different ratios (1:0, 1:0.1, 1:1 and 1:10) and G-nZVI/PS conditioning with continuous addition) in reducing the specific resistance of filtration (SRF) and removing antibiotic resistant genes (ARGs) were investigated. After 3 min, the SRF values decreased in following order: 2.45 × 10 8 m/kg (1:10) > 5.95 × 10 6 m/kg (1:0.1) > 3.72 × 10 6 m/kg (1:0) > 4.92 × 10 5 m/kg (1:1). In the continuous addition (1:1), the SRF value decreased from 1.04 × 10 8 m/kg to 6.47 × 10 6 m/kg at 9 min. Removal efficiency of ARGs was 2–6 orders of magnitude and no regeneration of ARGs was observed in sludge and water phase. When treated samples were incubated for 36 h, dominant microflora was negatively correlated with ARGs. This study revealed persulfate treatment could achieve dewatering and remove ARGs, simultaneously.