期刊
SCIENCE OF THE TOTAL ENVIRONMENT
卷 657, 期 -, 页码 945-952出版社
ELSEVIER
DOI: 10.1016/j.scitotenv.2018.12.037
关键词
Biocathode; Bioelectrochemical system (BES); Sulfate-reducing bacteria (SRB); Sulfide-oxidizing bacteria (SOB); Sulfur
资金
- Spanish Ministerio de Ciencia y Economia
- Explora Ciencia y Explora Tecnologia grant [CTM2014-62179-EXP]
- GENOCOV group (Grup de Recerca Consolidat de la Generalitat de Catalunya) [2017 SGR 1175]
- Catalan Agencia de Gestio d'Ajuts Universitaris i de Recerca [AGAUR 2017 FI_B 0121]
Sulfur oxide emissions can lead to acidic precipitation and health concerns. Flue gas desulfurization (FGD) systems treat these emissions generating a wastewater with high-sulfate content. This work is the first attempt to treat this effluent with bioelectrochemical systems (BES) in order to recover elemental sulfur, a technology that allows the treatment of several wastewaters that lack of electron donor. The sulfate treatment and elemental sulfur recovery have been studied in a biocathode with simultaneous sulfate reduction to sulfide and partial sulfide oxidation, comparing the performance obtained with synthetic and real wastewater. A decrease of the sulfate removal rate (SRR) from 108 to 73 mg S-SO42- L-1 d(-1) was observed coupled to an increase in the elemental sulfur recovery from 1.4 to 27 mg S-S-0 L-1 d(-1). This elemental sulfur recovered as a solid from the real wastewater represented a 64% of the theoretical elemental sulfur produced (the elemental sulfur corresponded to a 72% of the solid weight). In addition, microbial communities analysis of the membrane and cathode biofilms and planktonic biomass showed that the real wastewater allowed a higher growth of sulfur oxidizing bacteria (SOB) adapted to more complex waters as Halothiobacillus sp. while decreasing the relative abundance of sulfate reducing bacteria (SRB). (C) 2018 Elsevier B.V. All rights reserved.
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