Abstract
Aquatic system is the major source of atmospheric methane. This study explored the influences of ferrihydrite, which is widely existed in natural aquatic system, on methane emission. Results showed that the presence of ferrihydrite led to 26.4% more methane emission. By tracking the transformation of organic compounds, it is revealed that the enhanced methane emission was attributed to greater hydrolysis and degradation of refractory compounds. More specifically, the remaining humic-like substances (HS) in ferrihydrite group (46.4 mg/L-C) were only half of that in control group (80.1 g/L-C) after 30-day incubation. The X-ray photoelectron spectroscopy spectrum confirmed the more active oxidation of organics occurred in ferrihydrite group. It was also found that ferrihydrite aided in sustaining microbial activity at stationary and starvation phases. Further study on microbial communities found that ferrihydrite promoted the enrichment of both functional and electroactive genera. This study provides insights into the greenhouse gas emission in natural environment.
Original language | English |
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Pages (from-to) | 462-469 |
Number of pages | 8 |
Journal | Science of the Total Environment |
Volume | 688 |
DOIs | |
Publication status | Published - Oct 20 2019 |
Externally published | Yes |
Bibliographical note
Publisher Copyright:© 2019 Elsevier B.V.
ASJC Scopus Subject Areas
- Environmental Engineering
- Environmental Chemistry
- Waste Management and Disposal
- Pollution
Keywords
- Anaerobic conversion
- Aquatic environment
- Ferrihydrite
- Humic-like substances
- Methane emission