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- W4283359767 abstract "• Homogenous–heterogeneous hybrid catalysts were developed for DOM degradation. • Utilization of SO 4 2- in waste acid to electrogenerate persulfate/SO 4 •− was achieved. • Electrolysis (EC)/SO 4 2- /tourmaline system could generate • OH and SO 4 •− radicals. • EC/SO 4 2- /tourmaline system could significantly reduce the COD in real waste acid. • EC/SO 4 2- /tourmaline system was compatible with subsequent activated sludge process. Treatment of organic contaminants in waste acid via electrochemical oxidation process has drawn sustained attention. Inspired by the electro-generation of persulfate from homogeneous sulfate (SO 4 2- ) in waste acid and the catalytic activity of heterogeneous tourmaline, this study aimed to investigate the feasibility of in-situ persulfate electro-generation and activation via utilizing homogeneous–heterogeneous hybrid catalysts system (SO 4 2- /tourmaline) for organic contaminants removal in high chemical oxygen demand (COD) sulfate-containing waste acid. p -Aminodiphenylamine (RT-Base) was selected as a model organic contaminant to explore the mechanism of electrolysis/SO 4 2- /tourmaline system. No RT-Base was detected after 60 min reaction in electrolysis/SO 4 2- /tourmaline system. The formation of • OH and SO 4 •− in electrolysis/SO 4 2- /tourmaline system made contributions to the RT-Base degradation. Degradation intermediates of RT-Base were identified and possible degradation pathway was proposed. Additionally, the application of electrolysis/SO 4 2- /tourmaline system in treating the real RT-Base waste acid, which contained high COD and SO 4 2- , was explored. Results showed that the COD removal rate was 67.94% under the optimal conditions, and the electrolysis/SO 4 2- /tourmaline system could enhance the biodegradability of RT-Base waste acid. Furthermore, the electrolysis/SO 4 2- /tourmaline system followed by the activated sludge process achieved a high COD removal efficiency (99.09%). Microbial DNA analysis suggested that Bacteroidetes, Proteobacteria, and Actinobacteria were the dominant bacterial phyla in the activated sludge; and metabolism was the predominant microbial function. In-situ electro-generation of persulfate/SO 4 •− for organics degradation achieved efficient utilization of waste sulfate. Electrochemical oxidation process with activated sludge process as a post-treatment showed great potential in the treatment of organics in high-sulfate waste acid." @default.
- W4283359767 created "2022-06-25" @default.
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- W4283359767 date "2022-12-01" @default.
- W4283359767 modified "2023-09-24" @default.
- W4283359767 title "Mechanism and practical application of homogeneous–heterogeneous hybrid catalysts in electrolytic system for high COD chemical waste acid treatment" @default.
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- W4283359767 doi "https://doi.org/10.1016/j.cej.2022.137767" @default.
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