Journal
INTERNATIONAL BIODETERIORATION & BIODEGRADATION
Volume 142, Issue -, Pages 182-190Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ibiod.2019.05.013
Keywords
Temperature; UASB reactor; Sulfate-rich methanol wastewater; Methanogenesis enhancement; Sulfidogenesis suppression
Funding
- Japan Society for the Promotion of Science (JSPS) [17J00995]
- China Scholarship Council (CSC) [201608050003]
- Grants-in-Aid for Scientific Research [17J00995] Funding Source: KAKEN
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This study aims at investigating that the temperature effects on the overall organics removal capability and the reaction kinetic properties of methanogenesis/sulfidogenesis in anaerobic treatment of sulfate-rich methanol wastewater. A lab-scale upflow anaerobic sludge blanket (UASB) reactor was operated for 285 days treating sulfate-rich methanol wastewater at a temperature range of 17.5-50 degrees C. The COD/SO42- ratio of synthetic wastewater is 0.5. Experimental results indicate that both methanogens and sulfidogens showed lower metabolic activities at 17.5-25 degrees C. The average chemical oxygen demand (COD) removal efficiencies were higher than 90% at 40-50 degrees C. During these experimental periods, larger than 85% of influent COD was confirmed to be utilized for methanogenesis, revealing that methanogens prevailed over sulfidogens and dominated significantly in the COD utilization. In contrast, the sulfidogenesis-based COD utilization was effectively limited under the temperature range of 40-50 degrees C.
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