Food waste valorization using a novel system integrated dry fermentation, fractionation and torrefaction

IF 13.3 1区工程技术 Q1 ENGINEERING, CHEMICAL

Chemical Engineering Journal Pub Date : 2025-04-26 DOI:10.1016/j.cej.2025.163117

Hemin Ma, Pengyu Chen, Fan Hong, Ying Shi, Haifeng Lu, Weizhong Jiang, Chaoyuan Wang, Buchun Si

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Abstract

Conventional biological and thermochemical technologies for food waste (FW) valorization are constrained by the long-term operation, products recovery, low value-added products and unwanted byproducts. Here, an integration of magnetite promoted dry fermentation, fractionation and torrefaction (DFFT) was proposed for simultaneous production and recovery of VFAs, biohydrogen, and biochar from a typical FW, potato peel. The yield of VFAs and H₂ could reach to 22.8 g/L and 24.2 mL/g VS, respectively. Meanwhile, fractionation can effectively collect ethanol (82.04 %) and VFAs (above 90 %) from fermentation products. What’s more, the prepared biochar from solid residues was rich in nutrients and surface functional groups, with abundant pore structure, indicated that its potential as fertilizer and soil conditioner. Additionally, economic and greenhouse gas (GHG) emission analysis of the scale-up DFFT plant showed that profits could reach to 100.37 CNY/t FW, resulting in a GHG emission reduction of 305.87 kg CO₂ eq/t FW, with carbon sequestration and emission reduction achieved at the same time. In order to quantify the comprehensive effect of the system, a new index (economic-carbon index, ECI) was proposed to evaluate different FW treatment paths, and the results showed that DFFT was more effective, with a ECI value of 0.96. This study proves DFFT could be a promising system for FW valorization for sustainable chemicals, materials and energy production.

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利用干法发酵、分馏和焙烧相结合的新型系统处理食物垃圾

传统的食物垃圾生物和热化学处理技术受到长期操作、产品回收、低附加值产品和不需要的副产品的限制。本研究提出了一种磁铁矿促进干发酵、分馏和焙烧（DFFT）相结合的方法，以同时生产和回收典型的马铃薯皮中VFAs、生物氢和生物炭。VFAs和H2的产率分别可达22.8 g/L和24.2 mL/g VS。同时，分馏可以有效地收集发酵产物中的乙醇（82.04 %）和VFAs（90% %以上）。此外，固体残渣制备的生物炭富含营养物质和表面官能团，具有丰富的孔隙结构，表明其具有施肥和土壤改良剂的潜力。此外，对DFFT规模厂的经济和温室气体排放分析表明，DFFT规模厂的效益可达100.37元/吨FW，温室气体减排305.87 kg CO2当量/吨FW，同时实现了固碳和减排。为了量化系统的综合效果，提出了一个新的指标（经济碳指数，ECI）来评价不同的FW处理路径，结果表明DFFT更有效，ECI值为0.96。该研究证明，DFFT是一种很有前途的系统，可用于可持续化学品，材料和能源生产的FW增值。

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来源期刊

Chemical Engineering Journal 工程技术-工程：化工

CiteScore

21.70

自引率

9.30%

发文量

6781

审稿时长

2.4 months

期刊介绍： The Chemical Engineering Journal is an international research journal that invites contributions of original and novel fundamental research. It aims to provide an international platform for presenting original fundamental research, interpretative reviews, and discussions on new developments in chemical engineering. The journal welcomes papers that describe novel theory and its practical application, as well as those that demonstrate the transfer of techniques from other disciplines. It also welcomes reports on carefully conducted experimental work that is soundly interpreted. The main focus of the journal is on original and rigorous research results that have broad significance. The Catalysis section within the Chemical Engineering Journal focuses specifically on Experimental and Theoretical studies in the fields of heterogeneous catalysis, molecular catalysis, and biocatalysis. These studies have industrial impact on various sectors such as chemicals, energy, materials, foods, healthcare, and environmental protection.