The utilization of anaerobic hydrolysate from agroforestry wastes is limited by dissolved lignin and aromatics, which have received insufficient attention despite their potential as excellent carbon sources for denitrification. This study aims to investigate the influence of hematite on lignin-derived aromatic compounds and denitrifying carbon sources, as well as to identify iron-reducing bacteria that utilize lignin-derived aromatic compounds as electron donors. The findings revealed that hematite facilitated the anaerobic fermentation of plant biomass, resulting in the production of small molecular organic acids. Moreover, biodegradation of lignin-derived aromatic compounds led to the formation of phenolic acids, while an increased generation of denitrifying carbon sources enhanced nitrogen removal efficiency by 13.84 %. Additionally, due to adsorption by hematite and subsequent microbial degradation, there was a significant improvement (40.32%) in color removal rate within denitrification effluent. Notably, strains were hypothesized to be involved in Fe(Ⅲ) reduction coupled with aromatic compounds oxidation.

中文翻译：

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赤铁矿对木质纤维素厌氧水解产物中两类溶解有机化合物的影响：木质素衍生的芳香族化合物和反硝化碳源

农林业废物厌氧水解产物的利用受到溶解木质素和芳烃的限制，尽管它们具有作为反硝化的优良碳源的潜力，但尚未受到足够的重视。本研究旨在研究赤铁矿对木质素衍生芳香族化合物和反硝化碳源的影响，以及鉴定利用木质素衍生芳香族化合物作为电子供体的铁还原细菌。研究结果表明，赤铁矿促进植物生物质的厌氧发酵，从而产生小分子有机酸。此外，木质素衍生的芳香族化合物的生物降解导致酚酸的形成，而反硝化碳源生成的增加使脱氮效率提高了13.84%。此外，由于赤铁矿的吸附和随后的微生物降解，反硝化废水中的颜色去除率显着提高（40.32%）。值得注意的是，菌株被假设参与 Fe(Ⅲ) 还原和芳香族化合物氧化。