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Bioresour Technol

Title:		Metagenomic approach reveals the mechanism of calcium oxide improving kitchen waste dry anaerobic digestion
Author(s):		Zhang H; Zhao J; Fu Z; Wang Y; Guan D; Xie J; Zhang Q; Liu Q; Wang D; Sun Y;
Address:		"School of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao 266520, PR China. School of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao 266520, PR China. Electronic address: zhaojianwei@qut.edu.cn. Qingdao Jiebao Ecological Technology Co., Ltd., Qingdao 266000, PR China. College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China"
Journal Title:		Bioresour Technol
Year:		2023
Volume:		20230809
Issue:
Page Number:		129647 -
DOI:		10.1016/j.biortech.2023.129647
ISSN/ISBN:		1873-2976 (Electronic) 0960-8524 (Linking)
Abstract:		"In light of the characteristics of excessive acidification and low biogas yield during kitchen waste (KW) dry digestion, the impact of the calcium oxide (CaO) on KW mesophilic dry digestion was investigated, and the enhanced mechanism was revealed through metagenomic approach. The results showed that CaO increased the biogas production, when the CaO dosage was 0.07 g/g (based on total solid), the biogas production reached 656.84 mL/g suspended solids (VS), approximately 8.38 times of that in the control. CaO promoted the leaching and hydrolysis of key organic matter in KW. CaO effectively promoted the conversion of volatile fatty acid (VFA) and mitigated over-acidification. Macrogenome analysis revealed that CaO increased the microbial diversity in KW dry digestion and upregulated the abundance of genes related to amino acid and carbohydrates metabolism. This study provides an effective strategy with potential economic benefits to improve the bioconversion efficiency of organic matter in KW"
Keywords:		"Anaerobiosis *Biofuels *Fatty Acids, Volatile/metabolism Calcium Compounds Methane/metabolism Bioreactors Amino acid metabolism Biogas production Hydrolysis Over-acidification VFA accumulation;"
Notes:		"MedlineZhang, Hongying Zhao, Jianwei Fu, Zhou Wang, Yuxin Guan, Dezheng Xie, Jingliang Zhang, Qi Liu, Qingxin Wang, Dongbo Sun, Yingjie eng England 2023/08/12 Bioresour Technol. 2023 Nov; 387:129647. doi: 10.1016/j.biortech.2023.129647. Epub 2023 Aug 9"