Enhancing methane production in anaerobic co-digestion of food wastes and sewage sludge: roles of different types of iron amendments

Roghayeh Karimirad, Liwen Luo, Jonathan W. C. Wong
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Abstract

Iron element is known to be an effective additive for accelerating the anaerobic digestion (AD) process for treating organic wastes. However, the effects of different kinds of iron additives on food waste (FW) and sewage sludge of co-digestion process have not been yet investigated thoroughly. This study aimed to elucidate how different kinds of iron components affect methane production during FW and sewage sludge anaerobic co-digestion (co-AD) process and to investigate the possible mechanism of Fe amendment. Experimental results revealed that Fe amendment could effectively promote the substrate degradation and methane production, and FeCl3 amended group presented the best digestion performance, boosting the methane production from 465.9 mL to 2650.4 mL. The results of the excitation-emission matrix fluorescence spectra analysis further supported that Fe supplements facilitated the waste hydrolysis with a higher concentration of dissolved organic matters and thereby more substrates can be used for methane generation. In addition, the activity of coenzyme F420 and direct interspecies electron transfer in FeCl3 group were 5.82 and 5.89 times higher than those in the control group, respectively, indicating that electron transfer, particularly the interspecies one, was enhanced by Fe amendment. As compared to that in the control group, the increased cytochrome c concentration in Fe amended groups also proved it. Therefore, this study will provide a reference regarding Fe amendment in the co-AD process for FW and sewage sludge.

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提高餐厨垃圾和污水污泥厌氧共消化过程中的甲烷产量:不同类型铁添加剂的作用
众所周知,铁元素是加速厌氧消化(AD)工艺处理有机废物的有效添加剂。然而,不同种类的铁添加剂对食物垃圾(FW)和污水污泥协同消化过程的影响尚未得到深入研究。本研究旨在阐明不同种类的铁成分如何影响厨余垃圾和污水污泥厌氧协同消化(co-digestion,co-AD)过程中的甲烷产量,并探讨铁添加剂的可能作用机理。实验结果表明,铁添加剂能有效促进底物降解和甲烷产生,其中FeCl3添加剂组的消化效果最好,甲烷产生量从465.9 mL提高到2650.4 mL。激发-发射矩阵荧光光谱分析结果进一步证明,添加铁元素可促进废物水解,提高溶解有机物的浓度,从而使更多的底物可用于产生甲烷。此外,FeCl3 组的辅酶 F420 活性和种间直接电子传递活性分别是对照组的 5.82 倍和 5.89 倍,表明添加铁元素后电子传递,尤其是种间电子传递得到了增强。与对照组相比,铁添加组细胞色素 c 浓度的增加也证明了这一点。因此,本研究将为在 FW 和污水污泥的协同厌氧发酵过程中添加铁元素提供参考。 图表摘要
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