Effects of ferric iron on the anaerobic treatment and microbial biodiversity in a coupled microbial electrolysis cell (MEC)--anaerobic reactor.
Effects of ferric iron on the anaerobic treatment and microbial biodiversity in a coupled microbial electrolysis cell (MEC)--anaerobic reactor.
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DOI：
10.1016/j.watres.2013.06.056
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发表时间：
2013-10
期刊：
影响因子：
12.8
通讯作者：
Jingxin Zhang;Yaobin Zhang;X. Quan;Shuo Chen
中科院分区：
文献类型：
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作者：
Jingxin Zhang;Yaobin Zhang;X. Quan;Shuo Chen
在MEC-厌氧反应器中投加Fe(III)促进了有机物的降解。为了明确Fe(III)投加量和MEC和Fe(III)单独投加量对强化厌氧消化的各自影响，将3个厌氧反应器并联运行：投加Fe(OH)3的MEC-厌氧反应器(R1)、投加Fe(OH)3的厌氧反应器(R2)和普通厌氧反应器(R3)。当进水COD从1500 mg/L增加到4000 mg/L时，在0.8伏电压下，R1对COD的去除能力保持在88.3%，高于R2和R3反应器。停电后，R1对COD的去除降低了5.9%。添加Fe(OH)3促进了厌氧消化和阳极氧化，有效地矿化了挥发性脂肪酸(VFAS)。电场作用下Fe(II)浓度降低，胞外聚合物(EPS)产量增加。实时定量聚合酶链式反应显示，阳极生物膜和R1中的细菌丰度较高。焦解测序和变性梯度凝胶电泳(DGGE)分析表明，优势细菌和古菌群落在阳极生物膜和R1中更加丰富和丰富。
Adding Fe(III) into a MEC – anaerobic reactor enhanced the degradation of organic matters. To clarify the respective effects of combining Fe(III) dosage and a MEC and Fe(III) dosage only on strengthening anaerobic digestion, three anaerobic reactors were operated in parallel: a MEC – anaerobic reactor with dosing Fe(OH)3(R1), an anaerobic reactor with dosing Fe(OH)3(R2) and a common anaerobic reactor (R3). With increasing influent COD from 1500 to 4000 mg/L, the COD removal in R1 was maintained at 88.3% under a voltage of 0.8 V, which was higher than that in reactor R2 and R3. When the power was cut off, the COD removal in R1 decreased by 5.9%. The addition of Fe(OH)3enhanced both anaerobic digestion and anodic oxidation, resulting in the effective mineralization of volatile fatty acids (VFAs). The reduced Fe(II) combined with electric field resulted more extracellular polymeric substances (EPS) production. Quantitative real – time PCR showed a higher abundance of bacteria in the anodic biofilm and R1. Pyrosequencing and denaturing gradient gel electrophoresis (DGGE) analysis revealed that the dominant bacteria and archaea communities were richer and more abundant in the anode biofilm and R1.