降级(电信)
热液循环
液化
碳纤维
化学
生物降解
相(物质)
水热液化
水溶液
厌氧消化
化学工程
导电体
电子转移
抑制性突触后电位
甲烷
环境化学
材料科学
生物
生物化学
有机化学
催化作用
电信
复合数
计算机科学
工程类
复合材料
神经科学
作者
Dengming Zhu,Zixin Wang,Kaiqiang Liu,Buchun Si,Gaixiu Yang,Chunyan Tian,Yuanhui Zhang
标识
DOI:10.1016/j.cej.2022.140019
摘要
Anaerobic digestion is commonly performed to treat hydrothermal liquefaction aqueous phase (HTL-AP), but the conversion is limited by the inhibitory compounds. This study was conducted to investigate the effects of adding granular activated carbon, biochar, and magnetite on the digestion of HTL-AP. Moreover, the enriched aggregates and conductive materials were recovered after experiment, and then reused to study the effects of multi-cycle digestion on organics degradation, microbial activity, and methane production. Results showed that the conductive materials significantly contributed to the digestion performance and maintained high activity after recycling. The degradation of organic matters, especially the removal of toxic compounds, the enrichment of functional microbes, as well as the production of methane can be further enhanced with the reuse of conductive materials. Specifically, a 77% higher methane production rate was observed in magnetite assisted digester after recycling. More than 80% of the nitrogen organics were degraded with biochar, and all potential inhibitors were completely removed with GAC addition. The diversity and abundance of microbes were improved, and the dominant structure was established in the first batch, then the enrichment was further stabilized after the recycling. Meanwhile, the sludge conductivity was increased by 28.1 and 8.5 times in GAC and magnetite digesters in the first batch and was further enhanced by 8.0% and 16.4% after the recycling, indicating the improved expression of conductive pili and cytochromes of the microbes. These results point to the establishment of direct interspecies electron transfer. This study showed promising prospects for the utilization and recycling of conductive materials in the anaerobic digestion of HTL-AP and its long-term applications.
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