Effects of adding EDTA and Fe2+ on the performance of reactor and microbial community structure in two simulated phases of anaerobic digestion
Effects of adding EDTA and Fe2+ on the performance of reactor and microbial community structure in two simulated phases of anaerobic digestion
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DOI：
10.1016/j.biortech.2018.12.050
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发表时间：
2019-03-01
影响因子：
11.4
通讯作者：
Wang, Xiaofen
中科院分区：
文献类型：
--
作者：
Cai, Yafan;Hu, Kai;Wang, Xiaofen
在碳酸盐和硫酸盐存在下，微量元素的吸收会受到沉淀的阻碍。本研究的目的是调查乙二胺四乙酸（EDTA）是否通过与Fe2+形成溶解性络合物来增强厌氧消化的性能。在这项研究中进行了批实验，人工模拟产酸和产甲烷阶段。EDTA添加到两个阶段，以检查其对铁的生物利用度，代谢参数和微生物群落结构的影响。结果表明，EDTA的加入改变了铁的吸附规律，提高了铁的生物有效性，从而显著加速了两个阶段的消化过程。微生物群落结构的变化与EDTA法测定的铁形态的变化相一致。研究表明，EDTA作为配体可以提高铁的生物利用度，从而减少或取代铁的添加。
The uptake of trace elements can be impeded by precipitation in the presence of carbonates and sulfates. The objective of this study was to investigate whether ethylenediaminetetraacetic acid (EDTA) enhances the performance of anaerobic digestion by forming dissolved complexes with Fe2+. Batch experiments were performed in this study and acidogenic and methanogenic phases were artificially simulated. EDTA was added to both of phases to examine its effects on Fe bioavailability, metabolic parameters and microbial community structure. The results showed that EDTA significantly accelerated the digestion process in both phases because its addition changed the Fe sorption law and increased Fe-bioavailability. The microbial community structure changed following by the change of Fe-fractions which was determined by EDTA. This study demonstrated that EDTA as ligand could increase the Fe-bioavailability and then reduced or replaced the addition of Fe.