期刊
ENVIRONMENTAL RESEARCH
卷 214, 期 -, 页码 -出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.envres.2022.113946
关键词
Zero waste; Integration; Reuse; Subcritical water; Wheat straw
资金
- National Natural Science Foundation of China [32001652]
- Keypoint Research and Invention Program of Shannxi Province [2021ZDLNY05-06]
- Central Guiding Fund for Local Science and Technology development [2021Szvup118]
This study developed a closed-circuit biorefinery process for complete conversion of lignocellulose into ethanol, biogas, and organic fertilizer. The efficiency of subcritical water pretreatment and ethanol conversion was reduced during reuse of waste for biogas and fertilizer production. The yields of ethanol, biogas, and organic fertilizer were verified through mass balance. Hidden problems in the pilot-scale conversion process were identified, and strategies for optimizing the biorefinery process in the future were provided.
This study developed a closed-circuit biorefinery process for full conversion of lignocellulose into ethanol, biogas and organic fertilizer with zero waste on a pilot scale. In the process, subcritical water pretreatment could effectively break the structure of wheat straw (WS), and ethanol was obtained from pretreated wheat straw (PWS) using two batches of simultaneous saccharification and fermentation (SSF). The pretreatment and ethanol fermentation wastes were reused for biogas and organic fertilizer production by anaerobic digestion (AD), whereas the pretreatment and ethanol conversion efficiency were reduced when supernatant after AD was recovered for next batch pretreatment. The yields of ethanol (0.08-0.09 g/g), biogas (0.05-0.10 L/g) and organic fertilizer (0.55-0.79 g/g) were demonstrated through mass balance. Furthermore, the hidden problems were exposed on pilot-scale conversion process, and several strategies were provided for optimizing the biorefinery process in the future.
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