Wang, et al (2024) Optimization of the anaerobic digestion process and the metabolic pathway of methanogenesis of Jerusalem artichoke straw with the mixed addition of iron filings and biocharBiochar is a carbon-rich material created from biomass decomposition in low-oxygen conditions. It has important applications in environmental remediation, soil improvement, agriculture, carbon sequestration, energy storage, and sustainable materials, promoting efficiency and reducing waste in various contexts while addressing climate change challenges. More. Industrial Crops and Products. https://doi.org/10.1016/j.indcrop.2024.119424

A recent study investigated enhancing methane production during the anaerobic digestion (AD) of Jerusalem artichoke straw (JAS) through the combined addition of iron filings and biochar. The researchers used response surface methodology to determine the optimal conditions for methane production, examining factors such as the ratio of iron filings to biochar, initial pHpH is a measure of how acidic or alkaline a substance is. A pH of 7 is neutral, while lower pH values indicate acidity and higher values indicate alkalinity. Biochars are normally alkaline and can influence soil pH, often increasing it, which can be beneficial More, and solid content.

The optimal conditions were identified as a 2.45:7.55 iron filings to biochar ratio, an initial pH of 7.59, and 8.8% solid content. Under these conditions, the cumulative methane yield reached 278.11 mL g⁻¹ volatile solids (VS), representing a 48.69% increase compared to untreated controls. The mixed addition outperformed individual treatments of iron filings and biochar, boosting methane production by 22.29% and 29.57%, respectively.

Metagenomic analysis revealed that the mixed treatment enriched several microbial groups that are critical to the breakdown of complex organic matter and methane production. Notably, the acetoclastic pathway, responsible for methane production from acetate, was enhanced.

This approach not only improves methane yields but also offers an economically viable solution for managing the vast quantities of JAS generated in agricultural processes. By using affordable and readily available materials like iron filings and biochar, this study presents a sustainable method for optimizing AD and maximizing biogas production from lignocellulosic waste.