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[Effects of Magnetic Fe3O4 Nanoparticles on the Characteristics of Anaerobic Granular Sludge and Its Interior Microbial Community].
Su, Cheng-Yuan; Zheng, Peng; Lu, Yu-Xiang; Yuan, Qiu-Hong; Zhao, Li-Jian; Liao, Li-Ming; Huang, Zhi.
Afiliación
  • Su CY; School of Environment and Resources, Guangxi Normal University, Guilin 541004, China.
  • Zheng P; University Key Laboratory of Karst Ecology and Environmental Change of Guangxi, Guangxi Normal University, Guilin 541004, China.
  • Lu YX; School of Environment and Resources, Guangxi Normal University, Guilin 541004, China.
  • Yuan QH; School of Environment and Resources, Guangxi Normal University, Guilin 541004, China.
  • Zhao LJ; School of Environment and Resources, Guangxi Normal University, Guilin 541004, China.
  • Liao LM; School of Environment and Resources, Guangxi Normal University, Guilin 541004, China.
  • Huang Z; School of Environment and Resources, Guangxi Normal University, Guilin 541004, China.
Huan Jing Ke Xue ; 39(3): 1316-1324, 2018 Mar 08.
Article en Zh | MEDLINE | ID: mdl-29965479
In this study, the effects of magnetic Fe3O4 nanoparticles (Fe3O4 NPs) on soluble microbial products (SMP), loosely bound extracellular polymeric substances (LB-EPS), and tightly bound extracellular polymeric substances (TB-EPS) in anaerobic granular sludge were examined. In addition, the anaerobic granular sludge interior microbial community dynamics were investigated using high-throughput sequencing. The results demonstrated that the removal rate of COD was 83.6% after long-term exposure in the experimental reactor, namely, the anaerobic reactor containing Fe3O4 NPs. It was reduced by 5.7% in comparison with the removal rate in the control reactor. The total amount of TB-EPS in anaerobic granular sludge in the experimental and control reactors was 178.20 mg·g-1 and 138.24 mg·g-1, respectively, while the total amount of SMP in anaerobic granular sludge was 34.88 mg·L-1 and 27.44 mg·L-1, respectively. With regard to the LB-EPS in anaerobic granular sludge in the experimental reactor, the peak of humic acid disappeared and the peak intensity of coenzyme F420 decreased slightly using excitation-emission matrix (EEM) fluorescence spectra. In terms of the microbial community dynamics in the experimental reactor, the abundance of Methanobacterium was greatly augmented from 76.15% to 86.76%; whereas, the abundance of Methanothrix decreased from 17.1% to 7.51%. This indicated that Methanothrix was more sensitive to Fe3O4 NPs. Moreover, the changes in bacterial communities were evident:①the abundance of Proteobacteria dropped from 66.44% to 47.16%; ② the abundance of Actinobacteria grew from 8.97% to 17.33%; and ③ the abundance of Bacteroidetes increased from 8.07% to 17.74%. The increasing abundance of Actinobacteria and Bacteroidetes plays a positive role in the anaerobic hydrolysis of organic matter.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Aguas del Alcantarillado / Compuestos Ferrosos / Eliminación de Residuos Líquidos / Reactores Biológicos / Nanopartículas del Metal Idioma: Zh Revista: Huan Jing Ke Xue Año: 2018 Tipo del documento: Article País de afiliación: China Pais de publicación: China
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Aguas del Alcantarillado / Compuestos Ferrosos / Eliminación de Residuos Líquidos / Reactores Biológicos / Nanopartículas del Metal Idioma: Zh Revista: Huan Jing Ke Xue Año: 2018 Tipo del documento: Article País de afiliación: China Pais de publicación: China