Treatment of real flue gas desulfurization wastewater in an autotrophic biocathode in view of elemental sulfur recovery: Microbial communities involved
| Autor: | Juan A. Baeza, David Gabriel, Albert Guisasola, Enric Blázquez |
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| Rok vydání: | 2019 |
| Předmět: |
Environmental Engineering
010504 meteorology & atmospheric sciences Sulfide Microbial Consortia chemistry.chemical_element 010501 environmental sciences Waste Disposal Fluid 01 natural sciences chemistry.chemical_compound Halothiobacillus Environmental Chemistry Sulfate-reducing bacteria Sulfate Electrodes Waste Management and Disposal 0105 earth and related environmental sciences chemistry.chemical_classification Autotrophic Processes biology Sulfates Electrochemical Techniques biology.organism_classification Pollution Sulfur Sulfur oxide Flue-gas desulfurization Wastewater chemistry Chemical Industry Environmental chemistry Desulfovibrio |
| Zdroj: | Science of The Total Environment. 657:945-952 |
| ISSN: | 0048-9697 |
| Popis: | 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 73mgS-SO42-L-1d-1 was observed coupled to an increase in the elemental sulfur recovery from 1.4 to 27mgS-S0L-1d-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). |
| Databáze: | OpenAIRE |
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