Effect of zero-valent iron combined with carbon-based materials on the mitigation of ammonia inhibition during anaerobic digestion. (September 2020)

• Record Type: Journal Article
• Authors: Liu, Jibao; Zheng, Jiaxi; Niu, Yutong; Zuo, Zhuang; Zhang, Junya; Wei, Yuansong
• Is Part Of: Bioresource technology. Volume 311(2020)
• Publication Date: 2020-09
• Subjects: Anaerobic digestion -- Zero valent iron -- Activated carbon -- Graphite -- Ammonia inhibition; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2020.123503
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: 4 g/L of ZVI mitigated inhibition of AD under ammonia stress of 5 g/L. ZVI activated Methanosarcina thus reduced methane production lag phase by 45%. Its hybrid with carbon-based material further shortened lag phase over 63%. Hydrogenotrophic methanogenesis was activated mostly through enhanced DIET. Abstract: Ammonia inhibition is a prominent problem for anaerobic digestion (AD) of nitrogen-rich organic wastes. This study evaluated the effect of zero valent iron (ZVI) and its hybrid with activated carbon (AC), graphite and Fe-C material on the mitigation of ammonia inhibition under ammonia concentration over 5 g/L, according to the batch mode experiments. Results showed that ZVI (4 g/L) and its hybrid with carbon-based material preserving methane production from ammonia inhibition, with kinetics of shortening lag phase from 4.77 d to 2.62 d or even below 2 d with carbon-based material. ZVI preserved methane production with the enrichment of Methanosarcina (the relative abundance was over 80%), which was mostly derived from the activating hydrogenotrophic methanogenesis through the enhanced DIET but not the changes of ORP and FAN.