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Effect of magnetite on anaerobic digestion treating saline wastewater: Methane production, biomass aggregation and microbial community dynamics
- Source :
- Bioresource Technology. 341:125783
- Publication Year :
- 2021
- Publisher :
- Elsevier BV, 2021.
-
Abstract
- In this study, the effect of magnetite amendment on anaerobic digestion was investigated at three increasing salinity levels (0.5%, 1% and 2% NaCl). The amendment of magnetite enhanced the methane yield by 36.3%, 33.3% and 16.5% at low salinity (0.5% NaCl) and high salinity (1% and 2% NaCl), respectively. Meanwhile, a larger proportion of granules was obtained in the magnetite amended reactor (48.05% vs 33.16% at the end of operation). Microbial analysis suggested magnetite could induce more methanogenesis partnerships between hydrogenotrophic methanogens and syntrophic bacteria. Methanosaeta and Methanocorpusculum were the alternating dominant methanogens at low salinity and high salinity. While Streptococcus and Mesotoga were two prevalent bacteria that showed totally different transition tendency in two reactors. Additionally, the supplement of magnetite could relieve the suppression of methanogenesis-related gene expression caused by salinity, thus facilitated the higher methane production.
- Subjects :
- Environmental Engineering
biology
Renewable Energy, Sustainability and the Environment
Methanogenesis
Chemistry
Microbiota
Amendment
Bioengineering
General Medicine
Wastewater
biology.organism_classification
Ferrosoferric Oxide
Methanosaeta
Salinity
Anaerobic digestion
chemistry.chemical_compound
Bioreactors
Microbial population biology
Anaerobiosis
Biomass
Food science
Methane
Waste Management and Disposal
Magnetite
Subjects
Details
- ISSN :
- 09608524
- Volume :
- 341
- Database :
- OpenAIRE
- Journal :
- Bioresource Technology
- Accession number :
- edsair.doi.dedup.....a0ea886cc434cc8e78f694e054e855db