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326 results on '"Zhou, Aijuan"'

67. Unraveling the behavior of nitrite on promoting short-chain fatty acids accumulation from waste activated sludge by peracetic acid pretreatment: Extracellular polymeric substance decomposition and underlying mechanism

Author

Liu, Zhihong, primary, Zhou, Aijuan, additional, Duan, Yanqing, additional, Wang, Sufang, additional, Gao, Yanjuan, additional, Chen, Xi, additional, Cui, Zhixuan, additional, Guo, Zhengtong, additional, and Yue, Xiuping, additional

Published
2022
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69. Immobilizing bacteria in expanded perlite for the crack self-healing in concrete

Author

Zhang, Jiaguang, Liu, Yuanzhen, Feng, Tao, Zhou, Mengjun, Zhao, Lin, Zhou, Aijuan, and Li, Zhu

Subjects
Concrete cracking -- Analysis, Concretes -- Mechanical properties -- Analysis, Immobilization -- Analysis, Business, Construction and materials industries
Abstract

GRAPHICAL ABSTRACT ABSTRACT Immobilization has been reported to be an efficient approach for bacteria-based self-healing concrete to maintain the high-efficiency mineral-forming capacity of incorporated bacteria over a period of time. [...]

Published
2017
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77. Mechanism, electrochemistry and biotoxicity analysis of the biodegradation of sulfadiazine on Nickel(Ⅱ)/Manganese(Ⅱ)-modified graphite felt bioanode

Author

Zheng, Jierong, Wang, Sufang, Varrone, Cristiano, Zhou, Aijuan, Kong, Xin, Li, Houfen, Yu, Li, and Yue, Xueping

Subjects
Manganese, Nickel, Ni(Ⅱ)/Mn(Ⅱ)-bioanodes, Microbial community, Electrochemistry, Escherichia coli, Sulfadiazine, Graphite, Biotoxicity, Electrochemical performance, Biochemistry, Sulfadiazine wastewater, General Environmental Science
Abstract

Sulfadiazine (SDZ) is one of the most representative sulfonamides antibiotics, and its biodegradation has become a research hotspot in recent years. The present study innovatively adopted a microbial fuel cells with a Nickel (Ⅱ) and Manganese (Ⅱ)-decorated graphite felt bioanode (Ni(Ⅱ)/Mn (Ⅱ)-MFCs) to remove SDZ. The results demonstrated that the Ni(Ⅱ)/Mn (Ⅱ)-MFCs exhibited improved electrochemical performance, with a higher power density (742.98 ± 58.33 mW/m2) compared to the control MFCs (678.34 ± 52.87 mW/m2), an overall lower anode potential, and a larger double layer area (cyclic voltammetry). After 5 months of operation, approximately 97.95% of 30 mg/L SDZ was degraded within 120 h, which was 11.46% higher than that of the control MFCs. Moreover, SDZ and its byproducts could be better mineralized in the Ni(Ⅱ)/Mn (Ⅱ)-MFCs than the control, and the biotoxicity of SDZ towards Escherichia coli and Vibro qinghaiensis sp. Q67 could be greatly decreased after treatment with the modified MFCs. Based on the metabolites, we hypothesized that the chemical reactions hydroxylation, ammoxidation, SO2-extrusion, sulfur-reduction, etc. played a significant role in SDZ biodegradation. A microbial community analysis revealed that Dechloromonas (2.37%), Denitratisoma (5.32%) and Lentimicrobium (26.35%) were the dominant functional microbes in the Ni(Ⅱ)/Mn (Ⅱ)-MFCs. This study may provide insights and a theoretical basis for the biodegradation of sulfonamides and thus may facilitate further investigations and relevant findings.

Published
2022

79. Ferrous-Iron-Activated Sulfite-Accelerated Short-Chain Fatty Acid Production from Waste-Activated Sludge Fermentation: Process Assessment and Underlying Mechanism.

Author

Cao, Fang, Guo, Xujiang, Yin, Xiaoyun, Cui, Zhixuan, Liu, Shuli, and Zhou, Aijuan

Subjects
SHORT-chain fatty acids, ELECTRON paramagnetic resonance spectroscopy, ELECTRON paramagnetic resonance, FERMENTATION, SULFATE-reducing bacteria, FLUORESCENCE spectroscopy, FATTY acids
Abstract

To break the bottlenecks of slow hydrolysis and low acid production efficiency of waste-activated sludge (WAS) in the traditional anaerobic fermentation process, this study investigated the employment of ferrous-iron (Fe(II))-activated sulfite to produce hydroxyl, sulfate, and other highly oxidizing radicals on WAS floc cracking and short-chain fatty acid (SCFAs) production during anaerobic fermentation. The effect of the dosage ratio of Fe(II)/S(IV) was also studied. Results showed that the combined pretreatment of Fe(II)-activated sulfite significantly promoted the exfoliation of extracellular polymers and the subsequent SCFAs production. The highest concentration of SCFAs reached 7326.5 mg COD/L under the optimal dosage of 1:2 for Fe(II)/S(IV), which was 1.1~2.1 times higher than that of other research groups. Meanwhile, the analysis by 3D fluorescence spectroscopy and EPR (electron paramagnetic resonance) showed that Fe(II)-activated sulfite had a synergistic effect on the rupture of sludge cells and the stripping of extracellular polymers, with SO4− and OH as the key radicals generated and being much stronger in the 1:1 and 1:2 groups. High-throughput sequencing showed that the Fe(II)-activated sulfite system significantly changed the functional microbial diversity. The anaerobic fermentation bacteria and sulfate-reducing bacteria were significantly enriched. The underlying mechanism of Fe(II)-activated sulfite oxidation and molecular ecological network of key microbiomes were unveiled. [ABSTRACT FROM AUTHOR]

Published
2023
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