The biostimulation of anaerobic digestion with (semi)conductive ferric oxides: their potential for enhanced biomethanation
The biostimulation of anaerobic digestion with (semi)conductive ferric oxides: their potential for enhanced biomethanation
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DOI：
10.1007/s00253-015-6900-y
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发表时间：
2015-12-01
影响因子：
5
通讯作者：
Lee, Changsoo
中科院分区：
文献类型：
--
作者：
Baek, Gahyun;Kim, Jaai;Lee, Changsoo
采用间歇式厌氧消化法研究了氧化铁、铁羟基氧化物和导电磁铁矿的生物刺激作用对乳品废水厌氧消化的影响。添加羟基氧化铁（R2）和磁铁矿（R3）的反应器与对照（R1）相比，生物甲烷化性能显著增强。30天后，R1、R2和R3中化学需氧量（COD）的去除率分别为31.9%、59.3%和82.5%。消耗的COD在R2和R3中几乎完全回收为沼气，而在R1中仅回收79%。因此，在R1、R2和R3中，作为沼气的总能量生产分别为32.2、71.0和97.7 kJ。反应器的酸形成曲线也不同，在R1中发现更多的丙酸盐和丁酸盐，在R3中发现更多的乙酸盐。增强的生物甲烷化似乎与细菌群落结构的变化有关，推测是由添加的氧化铁引起的。与此相反，没有观察到明显的变化，在反应器中的古菌群落结构。潜在的电syntrophy之间形成的Methanosaetaconcilii-like产甲烷菌和电活性铁还原细菌，特别是Trichococcus，可能是负责增强性能。发酵性铁还原剂的刺激生长也可能通过改变细菌群落的代谢特征来产生更有利的产酸产物用于产甲烷而做出贡献。总体结果表明，（半）导电氧化铁的生物刺激，以提高有机废物的生物甲烷化的速率和效率的潜力。这似乎是潜在的吸引力，因为越来越多的注意力正在支付的废物/废水处理过程的能源自给自足的今天。
The effect of biostimulation with ferric oxides, semiconductive ferric oxyhydroxide, and conductive magnetite on the anaerobic digestion of dairy wastewater was examined in a batch mode. The reactors supplemented with ferric oxyhydroxide (R2) and magnetite (R3) showed significantly enhanced biomethanation performance compared with the control (R1). The removal of chemical oxygen demand (COD) after 30 days was 31.9, 59.3, and 82.5 % in R1, R2, and R3, respectively. The consumed COD was almost fully recovered as biogas in R2 and R3, while only 79 % was recovered in R1. The total energy production as biogas was accordingly 32.2, 71.0, and 97.7 kJ in R1, R2, and R3, respectively. The reactors also differed in the acid formation profile with more propionate and butyrate found in R1 and more acetate found in R3. The enhanced biomethanation seems to be associated with variations in the bacterial community structure supposedly induced by the ferric oxides added. In contrast, no evident variation was observed in the archaeal community structure among the reactors. The potential electric syntrophy formed between Methanosaeta concilii-like methanogens and electroactive iron-reducing bacteria, particularly Trichococcus, was likely responsible for the enhanced performance. The stimulated growth of fermentative iron reducers may also have contributed by altering the metabolic characteristics of the bacterial communities to produce more favorable acidogenic products for methanogenesis. The overall results suggest the potential of biostimulation with (semi)conductive ferric oxides to enhance the rate and efficiency of the biomethanation of organic wastes. This seems to be potentially attractive, as increasing attention is being paid to the energy self-sufficiency of waste/wastewater treatment processes today.