Influence of techniques for desorption of carbon dioxide on in situ methane enrichment during biogas fermentation

• Published in: Nong ye gong cheng xue bao Vol. 30; no. 5; pp. 178 - 184
• Main Authors: Yang, Shiguan, Li, Jihong, Zhao, Yuanfang, Xiao, Ting, Dong, Changqing
• Format: Journal Article
• Language: Chinese
• Published: 01.03.2014
• Subjects: Agricultural engineering; Biogas; Carbon dioxide; Desorption; Enrichment; Extraction; Methane; Stripping
• ISSN: 1002-6819
• DOI: 10.3969/j.issn.1002-6819.2014.05.023

In this study we evaluated the effects of different CO sub(2) desorption techniques. Three CO sub(2) desorption methods including air stripping, vacuum extraction and ultrasonic-auxiliary air stripping were studied through experiments. The experiments were conducted under mesophilic (38[degrees]C) anaerobic digestion by using synthetic wastewater with glucose and supplemental nutrients. The experimental apparatus included one anaerobic digester with volume of 1 500 mL and two CO sub(2)-desorption bottles with volume of 500 mL used for air stripping and vacuum extraction respectively. The results showed that the average volume fraction of methane in biogas reached 76.4% and 78.3% for the air stripping groups (aeration fluxes of 205 mL/min and daily stripping time of 30min), and increased by 17% and 20% compared to the control (65.4%) with the daily recycle rates of liquid stream (DRR) at 0.2 L/(L times d) and 0.4 L/(L times d), respectively.