Optimization ofS/Fe ratio for enhanced nitrobenzene biological removal in anaerobicSystem amended withSulfide-modified nanoscale zerovalent iron

Anaerobic reduction of nitrobenzene (NB) can be efficiently enhanced bySupplementing withSulfide-modified nanoscale zerovalent iron (S-nZVI). In thisStudy,S/Fe ratio ofS-nZVI was further optimized for enhancing biological NB removal in anaerobicSystem amended withS-nZVI and inoculated by anaerobicSl...

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Published in:Chemosphere (Oxford) 2020-05, Vol.247, p.125832, Article 125832
Main Authors: Zhang, Dejin, Li, Yang, Sun, Aiwu, Tong, Siqi, Jiang, Xinbai, Mu, Yang, Li, Jiansheng, Han, Weiqing, Sun, Xiuyun, Wang, Lianjun, Shen, Jinyou
Format: Article
Language:English
Subjects:
Anaerobic reduction
Microbial community
Nanoscale zerovalent iron
Nitrobenzene
ulfidation
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Summary:Anaerobic reduction of nitrobenzene (NB) can be efficiently enhanced bySupplementing withSulfide-modified nanoscale zerovalent iron (S-nZVI). In thisStudy,S/Fe ratio ofS-nZVI was further optimized for enhancing biological NB removal in anaerobicSystem amended withS-nZVI and inoculated by anaerobicSludge. The results indicated that the performance andStability of the coupled anaerobicSystem for NB reduction and aniline formation were remarkably improved byS-nZVI atS/Fe molar ratio of 0.3 (0.3S-nZVI). TheSecretion of extracellular polymericSubstances (EPS), transformation of volatile fatty acids (VFAs), yield of methane and activity ofSeveral key enzymes could be efficiently improved by 0.3S-nZVI. Furthermore,Species related to NB reduction, fermentation, electroactivity and methanogenesis could be enriched in 0.3S-nZVI coupled anaerobicSystem, with remarkable improvement in the biodiversity observed. ThisStudy demonstrated thatSulfidation would be a promising method to improve the performance of nZVI in coupled anaerobicSystems for the removal of recalcitrant nitroaromatic compounds from wastewater. [Display omitted] •NB reduction andSubstrate turnover was improved byS-nZVI in anaerobicSystem.•ecretion of extracellular polymericSubstances was enhanced byS-nZVI.•AppropriateSulfidation could improveSystemStability of the long-term operation.•Certain core functional genera were enriched in the coupledSystem.•Key enzymatic activities wereStimulated by nZVI with appropriateSulfidation.
ISSN:0045-6535
1879-1298
DOI:10.1016/j.chemosphere.2020.125832