Influence of ammonium acetate and betaine supplements on the anaerobic digestion under high salinity conditions

• Published in: Energy science & engineering 2020-07, Vol.8 (7), p.2621-2627
• Main Authors: Liu, Xuepeng, Liu, Hongyun, Peng, Liyu, Su, Haijia
• Format: Article
• Language: English
• Subjects: Additives; Alternative energy sources; Ammonium; Ammonium acetate; Anaerobic conditions; Anaerobic digestion; betaine; Biogas; Carbon; Environmental effects; Experiments; Fatty acids; Flora; Food waste; Free radicals; Heat; high salinity; Lipid peroxidation; Methane; Microorganisms; Repair; Salinity; Salt; Salts; Sodium chloride; Wastewater
• ISSN: 2050-0505; 2050-0505
• DOI: 10.1002/ese3.689

High salinity frequently causes inhibition and even failure in anaerobic digestion. To explore the impact of increasing NaCl concentrations on biogas production and reveal the role of repair factors in response to high salinity stress, the present research examined the effect of ammonium acetate and betaine as exogenous repair factors on the activity of microorganisms under high‐salt conditions. High salinity wastewater with and without repair additives were compared. The cumulative methane production significantly increased and the methane concentration increased by approximately 30%. The results showed that the repair factors were efficient to relieve the effect of a high‐salt environment on the anaerobic microbial flora, thus considerably reducing the salt‐induced inhibition of anaerobic digestion. The cumulative yield of methane increased by about 3.7 times, and the concentration of methane increased by about 30%. The speed of acidification is accelerated by 90 hours, the stable pH of the system is ahead by 200 hours, and the stable methane concentration is ahead by 100 hours.