Effect of alkaline pretreatment on mesophilic and thermophilic anaerobic digestion of a submerged macrophyte: Inhibition and recovery against dissolved lignin during semi-continuous operation
Effect of alkaline pretreatment on mesophilic and thermophilic anaerobic digestion of a submerged macrophyte: Inhibition and recovery against dissolved lignin during semi-continuous operation
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DOI：
10.1016/j.biortech.2017.04.046
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发表时间：
2017-08-01
影响因子：
11.4
通讯作者：
Toda, Tatsuki
中科院分区：
文献类型：
--
作者：
Koyama, Mitsuhiko;Watanabe, Keiko;Toda, Tatsuki
使用中温和高温条件研究了碱性预处理对富含木质素的沉水植物 Potamogeton maackianus 半连续厌氧消化 (AD) 的长期影响。在预处理的反应器中，溶解的木质素积累到很高的水平。预处理条件下的 CH4 产量高于未处理条件，但从第 22 天（嗜温）和第 42 天（嗜热）开始下降。然而，尽管溶解的木质素积累，但 CH4 产量随后恢复。此外，观察了不同条件下微生物群落的变化。这些结果表明溶解的木质素暂时抑制AD，尽管在长期操作过程中发生了对溶解木质素的适应。在稳态期间，通过预处理，中温条件下 CH4 产量增加了 42%，而高温条件下则增加了 8%。由于即使在高温预处理条件下适应后，挥发性脂肪酸也会积聚并随废水排出，因此改进产甲烷步骤将能够提高 CH4 回收率。 (C) 2017 Elsevier Ltd. 保留所有权利。
The long-term effect of alkaline pretreatment on semi-continuous anaerobic digestion ( AD) of the ligninrich submerged macrophyte Potamogeton maackianus was investigated using mesophilic and thermophilic conditions. In pretreated reactors, dissolved lignin accumulated to high levels. CH4 production under the pretreated condition was higher than that of the untreated condition, but decreased from Days 22 (mesophilic) and 42 (thermophilic). However, CH4 production subsequently recovered, although dissolved lignin accumulated. Further, the change in the microbial community was observed between conditions. These results suggest that dissolved lignin temporarily inhibited AD, although acclimatization to dissolved lignin occurred during long-term operation. During the steady state period, mesophilic conditions achieved a 42% increase in the CH4 yield using pretreatment, while thermophilic conditions yielded an 8% increment. Because volatile fatty acids accumulated even after acclimatization during the thermophilic pretreated condition and was discharged with the effluent, improvement of the methanogenic step would enable enhanced CH4 recovery. (C) 2017 Elsevier Ltd. All rights reserved.