Highly efficient oriented bioconversion of food waste to lactic acid in an open system: Microbial community analysis and biological carbon fixation evaluation

IF 9 1区环境科学与生态学 Q1 AGRICULTURAL ENGINEERING

Bioresource Technology Pub Date : 2023-02-01 DOI:10.1016/j.biortech.2022.128398

Shuo Liu , Qunhui Wang , Yuan Li , Xiaoyu Ma , Wenbin Zhu , Nuohan Wang , Haishu Sun , Ming Gao

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引用次数: 4

Abstract

The valorization of organic solid waste to lactic acid (LA) in open fermentation systems has attracted tremendous interest in recent years. In this study, a highly efficient oriented LA bioconversion system from food waste (FW) in open mode was established. The maximum LA production was 115 g/L, with a high yield of 0.97 g-LA/g-total sugar. FW is a low-cost feedstock for LA production, containing indigenous hydrolysis and LA-producing bacteria (LAB). Saccharification and real-time pH control were found to be essential for maintaining LAB dominantly in open systems. Furthermore, microbial community analysis revealed that Enterococcus mundtii adapted to complex FW substrates and dominated the subsequent bioconversion process. The oriented LA bioconversion exhibited the capacity for biological carbon fixation by reducing CO₂ emissions by at least 21 kg per ton of FW under anaerobic conditions.

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开放式系统中食物垃圾向乳酸的高效生物转化:微生物群落分析和生物固碳评价

近年来，有机固体废物在开放式发酵系统中转化为乳酸(LA)引起了人们极大的兴趣。在本研究中，建立了一种在开放模式下，以食物垃圾(FW)为导向的高效LA生物转化系统。LA产量最高可达115 g/L，最高产量为0.97 g-LA/g-总糖。FW是一种低成本的LA生产原料，含有本地水解和LA生产细菌(LAB)。糖化和实时pH控制被发现是维持开放系统中LAB的关键。此外，微生物群落分析显示蒙氏肠球菌适应复杂的FW底物，并主导了随后的生物转化过程。定向LA生物转化表现出生物固碳能力，在厌氧条件下，每吨FW至少减少21 kg的CO2排放。

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来源期刊

Bioresource Technology 工程技术-能源与燃料

CiteScore

20.80

自引率

19.30%

发文量

2013

审稿时长

12 days

期刊介绍： Bioresource Technology publishes original articles, review articles, case studies, and short communications covering the fundamentals, applications, and management of bioresource technology. The journal seeks to advance and disseminate knowledge across various areas related to biomass, biological waste treatment, bioenergy, biotransformations, bioresource systems analysis, and associated conversion or production technologies. Topics include: • Biofuels: liquid and gaseous biofuels production, modeling and economics • Bioprocesses and bioproducts: biocatalysis and fermentations • Biomass and feedstocks utilization: bioconversion of agro-industrial residues • Environmental protection: biological waste treatment • Thermochemical conversion of biomass: combustion, pyrolysis, gasification, catalysis.