Song Liang, Cai Chenhang, Lin Chunxiang, Lv Yuancai, Liu Yifan, Ye Xiaoxia, Liu Minghua, Dai Xiaohu
Fujian Provincial Engineering Research Center of Rural Waste Recycling Technology, College of Environment & Safety Engineering, Fuzhou University, Fuzhou 350108, China.
State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China.
Waste Manag. 2024 Apr 15;178:57-65. doi: 10.1016/j.wasman.2024.02.010. Epub 2024 Feb 19.
An annual production of about 500 million tons of household food waste (HFW) has been documented, resulting in significant implications for human health and the environment in the absence of appropriate treatment. The anaerobic fermentation of HFW in an open system offers the potential to recover high value-added products, lactic acid (LA), thereby simultaneously addressing waste treatment and enhancing resource recovery efficiency. Most of LA fermentation studies have been conducted under mesophilic and thermophilic conditions, with limited research on the production of LA through anaerobic fermentation under hyperthermophilic conditions. This study aimed to produce LA through anaerobic fermentation from HFW under hyperthermophilic conditions (70 ± 1 °C), while varying pH values (5.0 ± 0.1, 7.0 ± 0.1, and 9.0 ± 0.1), and compare the results with LA production under mesophilic (35 ± 1 °C) and thermophilic (52 ± 1 °C) conditions. The findings of this study indicated that the combination of hyperthermophilic conditions and a neutral pH (pH7_70) yielded the highest concentration of LA, measuring at 17.75 ± 1.51 g/L. The mechanism underlying the high yield of LA at 70 °C was elucidated through the combined analysis of organics dissolution, enzymes activities, and 16S rRNA microbiome sequencing.
据记录，每年产生约5亿吨家庭食物垃圾（HFW），若缺乏适当处理，会对人类健康和环境产生重大影响。在开放系统中对HFW进行厌氧发酵，有潜力回收高附加值产品乳酸（LA），从而同时解决废物处理问题并提高资源回收效率。大多数LA发酵研究是在中温及高温条件下进行的，而在超高温条件下通过厌氧发酵生产LA的研究有限。本研究旨在在超高温条件（70±1°C）下，通过对HFW进行厌氧发酵生产LA，同时改变pH值（5.0±0.1、7.0±0.1和9.0±0.1），并将结果与中温（35±1°C）和高温（52±1°C）条件下的LA生产结果进行比较。本研究结果表明，超高温条件与中性pH值（pH7_70）相结合时，LA浓度最高，为17.75±1.51g/L。通过对有机物溶解、酶活性和16S rRNA微生物群落测序的综合分析，阐明了70°C时LA高产的潜在机制。
