Effect of external carbon addition and enrofloxacin on the denitrification and microbial community of sequencing batch membrane reactor treating synthetic mariculture wastewater

Zhang, Xue; Chen, Jin; Gu, Baiming; Ji, Junyuan; Zhao, Yangguo; Gao, Mengchun; She, Zhigang

doi:10.1016/j.jenvman.2022.116155

Cited by 8 publications

(1 citation statement)

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“…Large amounts of ENR antibiotic residues have been reported to be frequently found in contaminated water in aquaculture areas at concentrations ranging from 0.2 to 0.5 μg/L . In some mariculture areas, the detection rate of ENR has reached 100%, and even high concentrations (mg/L) of ENR are frequently detected , Efficient removal of ENR from aquaculture wastewater is a challenge, as it may lead to resistance of a large number of pathogenic bacteria, organism inhibition, and even genotoxicity after prolonged exposure . Therefore, eliminating the accumulation of ENR is highly important for reducing potential ecological risks in aquatic environments.…”

Section: Introductionmentioning

confidence: 99%

In Situ Simultaneous Generation and Activation of Hydrogen Peroxide by the ZVI-Mn Catalyst for the Degradation of Enrofloxacin

Wu,

Lin,

Chen

2024

ACS EST Water

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Fenton oxidation is highly efficient for removing pollutants from wastewater. However, the low utilization efficiency of oxidants increases operating costs and limits their application in water treatment. To address these issues, this study designed a novel Fenton-like catalyst: zerovalent iron/amorphous manganese composites (ZVI-Mn). This catalyst can activate O 2 in situ to generate H 2 O 2 and simultaneously activate H 2 O 2 to produce free radicals, achieving a 96.3% removal efficiency of enrofloxacin (ENR) from water. Radical quenching experiments showed that superoxide radicals (•O 2− ) (46%) play a dominant role in ENR removal, while hydroxyl radicals (•OH) (28.2%) and singlet oxygen ( 1 O 2 ) (25.8%) also participate. Liquid chromatography− mass spectrometry (LC−MS), density functional theory (DFT) calculations, and toxicity estimations demonstrated effective ENR degradation and significant toxicity reduction of the intermediates, primarily through decarboxylation and ring opening. Additionally, ZVI-Mn achieved a 90.1% removal efficiency of ENR in aquaculture wastewater. This study proposes a new Fenton oxidation technique based on the in situ generation of H 2 O 2 , providing a meaningful research basis for environmentally friendly water treatment technologies.

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