Lactate as an effective electron donor in the sulfate reduction: impacts on the microbial diversity
| Autor: | Juliana Kawanishi Braga, Renata Piacentini Rodriguez, Theodore M. Flynn, Gunther Brucha, A. Santos, Giselle Patrícia Sancinetti, Josiel Martins Costa |
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| Rok vydání: | 2021 |
| Předmět: |
0208 environmental biotechnology
Electrons Electron donor 02 engineering and technology 010501 environmental sciences Waste Disposal Fluid 01 natural sciences chemistry.chemical_compound Bioreactors Sodium lactate Environmental Chemistry Organic matter Lactic Acid Food science Sulfate Sulfate-reducing bacteria Waste Management and Disposal 0105 earth and related environmental sciences Water Science and Technology chemistry.chemical_classification Ethanol biology Sulfates General Medicine biology.organism_classification Desulfovibrio 020801 environmental engineering chemistry Bacteria |
| Zdroj: | Environmental Technology. 43:3149-3160 |
| ISSN: | 1479-487X 0959-3330 |
| DOI: | 10.1080/09593330.2021.1916092 |
| Popis: | The competition between sulfate-reducing bacteria and methane-producing archaea has a major influence on organic matter removal, as well as the success of sulfidogenic systems. This study investigated the performance of six batch sulfidogenic reactors in response to different COD/sulfate ratios (1.0 and 2.0) and electron donors (cheese whey, ethanol, and sodium lactate) by evaluating the biochemical mechanisms of sulfate reduction, organic matter oxidation, and microbial structure modification. A COD/sulfate ratio of 1.0 resulted in high sulfidogenic activity for all electron donors, thereby achieving a nearly 80% sulfate removal. Lactate provided high sulfate removal rates at COD/sulfate ratios of 1.0 (80%) and 2.0 (90%). A COD/sulfate ratio of 2.0 decreased the sulfate removal rates by 25 and 28% when ethanol and cheese whey were used as substrates. The sulfate-reducing bacteria populations increased using ethanol and lactate at a COD/sulfate ratio of 1.0. Particularly, Desulfovibrio, Clostridium, and Syntrophobacter were predominant. Influent composition and COD/sulfate ratio influenced the relative abundance of the microbial communities. Therefore, controlling these parameters may facilitate the wastewater treatment with high sulfate levels through bacterial activity. |
| Databáze: | OpenAIRE |
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