Optimization of Fe2+ supplement in anaerobic digestion accounting for the Fe-bioavailability
Optimization of Fe2+ supplement in anaerobic digestion accounting for the Fe-bioavailability
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DOI：
10.1016/j.biortech.2017.07.151
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发表时间：
2018-02-01
影响因子：
11.4
通讯作者：
Wang, Xiaofen
中科院分区：
文献类型：
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作者：
Cai, Yafan;Zhao, Xiaoling;Wang, Xiaofen
铁被广泛用作厌氧消化中的添加剂，但其生物有效性及其促进消化的机制尚不清楚。本研究采用序贯提取法测定铁的生物有效性，并采用生化参数、动力学模型和荧光定量PCR（Q-PCR）方法探讨其刺激作用机制。结果表明，连续提取法是评价厌氧系统Fe生物有效性的合适方法，但Fe生物有效性较低，波动范围有限（1.7 ~-3.1wt%），容易出现Fe含量不足的情况。当Fe ~（2+）添加量为10-500 mg/L时，甲烷产率增加。适量的Fe 2+可加速稻草的分解，促进产甲烷菌的代谢，从而提高反应器的性能。修正的Gompertz模型比一级动力学模型更好地拟合结果。可行性分析表明，
Fe is widely used as an additive in anaerobic digestion, but its bioavailability and the mechanism by which it enhances digestion are unclear. In this study, sequential extraction was used to measure Fe bioavailability, while biochemical parameters, kinetics model and Q-PCR (fluorescence quantitative PCR) were used to explore its mechanism of stimulation. The results showed that sequential extraction is a suitable method to assess the anaerobic system bioavailability of Fe, which is low and fluctuates to a limited extent (1.7 to -3.1 wt%), indicating that it would be easy for Fe levels to be insufficient. Methane yield increased when the added Fe2+ was 10-500 mg/L. Appropriate amounts of Fe2+ accelerated the decomposition of rice straw and facilitated methanogen metabolism, thereby improving reactor performance. The modified Gompertz model better fitted the results than the first-order kinetic model. Feasibility analysis showed that addition of Fe2+ at