Iron-Oxide-Promoted Anaerobic Process of the Aquatic Plant of Curly Leaf Pondweed

Abstract

The technique of producing methane with lignocellulosic biomass as feedstock has been used worldwide. In the current study, three types of iron oxides, including goethite, hematite, and magnetite, were used to improve methane production from the aquatic plant curly leaf pondweed. In comparison to the control, hydrolysis efficiency of the aquatic plant in reactors with iron oxides was increased from 31.4 ± 0.1% to a higher level, which varied between 49.1 ± 4.6 and 74.1 ± 4.1%, and the accumulated methane production and formation rates were increased significantly. For all reactors with iron oxides, the accumulated methane production increased with increasing dosages. When the dosages of iron oxide were 0.5 and 1.0%

Enhanced Anaerobic Digestion of Cow Manure and Rice Straw by the Supplementation of an Iron Oxide–Zeolite System

“…Jiang et al reported a significantly promoted methanogenesis by the addition of poorly crystalline akaganeite, proposing a mechanism that this kind of iron oxide, which functioned as an electron flow medium, could accelerate the syntrophic metanogenesis of acetate-oxidizing bacteria and methanogenic archaea. Ma et al and Tan et al also verified that iron oxide minerals can be used as an effective supplementation to enhance methane yields from AD of different biomasses.…”

Performance and mechanism of conductive magnetite particle-enhanced excess sludge anaerobic digestion for biogas recovery

“…Recently, magnetite particles, as conductive materials, have been applied to the waste treatment process. Ma et al 7 also found that magnetite could improve the degradation efficiency of an aquatic plant, curly-leaf pondweed. Moreover, the effects of magnetite on the anaerobic co-digestion of pig manure and wheat straw proved that magnetite could enhance methane production and cellulase activity.…”

Surface properties of activated sludge-derived biochar determine the facilitating effects on Geobacter co-cultures

“…Biochar was reported to be able to accelerate the IET rate with cells separately attached to the surface of biochar, suggesting that electrons were likely conducted through the biochar (Chen et al, 2014b). Many studies demonstrated that the methanogenesis process was significantly accelerated in the presence of iron oxide by promoting the DIET process (Cruz Viggi et al, 2014;Kato et al, 2012b;Li et al, 2015a;Ma et al, 2015). Beside iron oxide, carbon nanotubes (CNTs) in the methanogenic sludge of anaerobic wastewater treatment systems induced much faster methane production and substrate utilization rates (Li et al, 2015b).…”