Upgrading of mesophilic anaerobic digestion of waste activated sludge by thermophilic pre-fermentation and recycle: Process performance and microbial community analysis
Upgrading of mesophilic anaerobic digestion of waste activated sludge by thermophilic pre-fermentation and recycle: Process performance and microbial community analysis
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DOI：
10.1016/j.fuel.2015.11.091
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发表时间：
2016-04
期刊：
影响因子：
7.4
通讯作者：
Li-Jie Wu;Atsushi Higashimori;Yu Qin;Toshimasa Hojo;K. Kubota;Y. Li
中科院分区：
文献类型：
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作者：
Li-Jie Wu;Atsushi Higashimori;Yu Qin;Toshimasa Hojo;K. Kubota;Y. Li
为了对传统的中温厌氧消化工艺进行升级改造，引入高温预发酵和循环系统，形成了连续高温-中温阶段厌氧消化工艺（TPAD）和具有循环能力的高温-中温阶段厌氧消化工艺（TPAD-R）。以MD作为对照的同步操作表明TPAD和TPAD-R中固体减少和产生甲烷的能力有显著改善，两个系统中的改善量相似。VS的去除率从MD中的约40%提高到50%，甲烷回收率从MD中的0.53 L/g VS提高到0.63 L/g VS。TPAD和TPAD-R中的高温阶段对有机物的降解和增溶有较大贡献，高温阶段的比水解速率可达0.2gCOD/gVS/d。此外，在实验条件下，TPAD和TPAD-R中的嗜热阶段在产酸和产甲烷过程中也起着重要作用。高温预发酵使中温阶段的主要菌门和菌属为厚壁菌和甲烷菌，分别占44%和54%。回收系统提高了TPAD-R嗜热阶段细菌和古菌的多样性。TPAD和TPAD-R也实现了MD净能量的两倍左右。
In order to upgrade the conventional mesophilic anaerobic (MD) of waste activated sludge (WAS), a thermophilic pre-fermentation and a recycle system were introduced to form continuous thermophilic–mesophilic temperature-phased anaerobic digestion (TPAD) and TPAD with recycling capability (TPAD-R). The synchronous operation, with the MD as control, indicated significant improvements in reduction of solids and the ability to produce methane in the TPAD and TPAD-R, with a similar amount of improvement in both systems. VS reduction was improved from about 40% in the MD to 50%, and the methane recovery rates were improved from 0.53 L/g VS destroyed in the MD to 0.63 L/g VS destroyed accordingly. The thermophilic stage in the TPAD and TPAD-R made a large contribution to organic matter degradation and solubilization, and the specific hydrolysis rate in thermophilic stage attained 0.2 gCOD/g VS/d. Furthermore, under experimental conditions, the thermophilic stage in the TPAD and TPAD-R also played an important role in acidogenesis and methanogenesis. The thermophilic pre-fermentation madeFirmicutesandMethanosarcinabecome the main phylum and genus in the mesophilic stage, accounting for 44% and 54%, respectively. The recycle system improved the diversity of bacteria and archaea in the thermophilic stage of the TPAD-R. The TPAD and TPAD-R also achieved about twice the net energy of the MD.