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The correlation of methanogenic communities’ dynamics and process performance of anaerobic digestion of thermal hydrolyzed sludge at short hydraulic retention times
Bioresource Technology ( IF 11.4 ) Pub Date : 2018-10-10 , DOI: 10.1016/j.biortech.2018.10.023
Simon M. Wandera , Maria Westerholm , Wei Qiao , Dongmin Yin , MengMeng Jiang , Renjie Dong

Requirement of a long hydraulic retention time (HRT) for efficient degradation restrains the anaerobic digestion of hydrothermal pretreated sludge. Shortening the HRT can increase the treatment capacity of a plant but may also induce digester instability. This study investigated the impact of HRT on process performance and microbial community by consecutively operating a reactor for 145 days. The HRT was gradually decreased from 20 to 10, 5, and 3 days. The methane yield declined from 0.28 to 0.12 L/g-VSin with this shortening, and acetate concentration increased from 38 to 376 mg/L. Methanoculleus (58%) dominated methanogens at a 20 days HRT. However, the methanogenic structure shifted toward an increased level of Methanospirillum, representing 95% of the total archaea at a 3 days HRT. Microorganisms were almost washed out at the end of experiment. Conclusively, shortening HRTs is a feasible strategy to increase treatment capacity and produce more biogas at existing plants.



中文翻译:

短水力停留时间产甲烷菌群落动力学与热水解污泥厌氧消化过程性能的相关性

为了有效降解需要较长的水力停留时间(HRT),这限制了水热预处理污泥的厌氧消化。缩短HRT可以提高植物的处理能力,但也可能导致消化池不稳定。这项研究通过连续运行反应器145天,研究了HRT对工艺性能和微生物群落的影响。HRT从20天逐渐减少到10、5和3天。甲烷产率下降,从0.28到0.12升/克-VS与该起酥油,和乙酸浓度从38增加到376毫克/升。Methanoculleus(58%)在20天HRT主导产甲烷菌。然而,产甲烷的结构向甲基螺菌的水平增加,在3天的HRT时占总古细菌的95%。在实验结束时,微生物几乎被冲洗掉了。总之,缩短HRT是增加现有工厂的处理能力并生产更多沼气的可行策略。

更新日期:2018-10-10
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