Effect of acidification pretreatment on two-phase anaerobic digestion of acidified food waste

IF 7.1 2区环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL

Waste management Pub Date : 2024-10-01 DOI:10.1016/j.wasman.2024.09.022

Xudong Wang , Xujia Ming , Mengyu Chen , Xiao Han , Xianguo Li , Dahai Zhang

{"title":"Effect of acidification pretreatment on two-phase anaerobic digestion of acidified food waste","authors":"Xudong Wang , Xujia Ming , Mengyu Chen , Xiao Han , Xianguo Li , Dahai Zhang","doi":"10.1016/j.wasman.2024.09.022","DOIUrl":null,"url":null,"abstract":"<div><div>Acidified food waste significantly disrupts anaerobic digestion, highlighting the need for effective solutions to mitigate its impact. This study presents a method that utilizes acidified sludge to pretreat acidified food waste, thereby significantly improving the efficiency of hydrolysis and acidogenesis. After acidification pretreatment, hydrolysis efficiency improved from 64.54 % to 96.51 %, while acidogenesis efficiency increased from 34.82 % to 49.95 %. Additionally, the concentration of short-chain fatty acids and hydrogen production in the acidification pretreatment group increased by 45.89 % and 48.67 %, respectively. The pretreatment group exhibited a biochemical methane potential of 512.84 ± 13.73 mL/(g volatile suspended solids), which was 35.77 % higher than that of the control group. Mechanism analysis revealed that the higher abundance of genes associated with lactate dehydrogenase in the acidified sludge facilitated the rapid degradation of lactic acid. Moreover, the abundant <em>Clostridium butyricum</em> in the acidified sludge promoted the targeted conversion of lactic acid and other organic matter into butyric acid within the food waste system. This efficient butyric acid fermentation improved the fermentation environment and provided abundant substrates for methane production. This study introduces a promising bio-based strategy to improve the anaerobic digestion efficiency of acidified food waste.</div></div>","PeriodicalId":23969,"journal":{"name":"Waste management","volume":"190 ","pages":"Pages 208-216"},"PeriodicalIF":7.1000,"publicationDate":"2024-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Waste management","FirstCategoryId":"93","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0956053X24005099","RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, ENVIRONMENTAL","Score":null,"Total":0}

引用次数: 0

Abstract

Acidified food waste significantly disrupts anaerobic digestion, highlighting the need for effective solutions to mitigate its impact. This study presents a method that utilizes acidified sludge to pretreat acidified food waste, thereby significantly improving the efficiency of hydrolysis and acidogenesis. After acidification pretreatment, hydrolysis efficiency improved from 64.54 % to 96.51 %, while acidogenesis efficiency increased from 34.82 % to 49.95 %. Additionally, the concentration of short-chain fatty acids and hydrogen production in the acidification pretreatment group increased by 45.89 % and 48.67 %, respectively. The pretreatment group exhibited a biochemical methane potential of 512.84 ± 13.73 mL/(g volatile suspended solids), which was 35.77 % higher than that of the control group. Mechanism analysis revealed that the higher abundance of genes associated with lactate dehydrogenase in the acidified sludge facilitated the rapid degradation of lactic acid. Moreover, the abundant Clostridium butyricum in the acidified sludge promoted the targeted conversion of lactic acid and other organic matter into butyric acid within the food waste system. This efficient butyric acid fermentation improved the fermentation environment and provided abundant substrates for methane production. This study introduces a promising bio-based strategy to improve the anaerobic digestion efficiency of acidified food waste.

Abstract Image

查看原文本刊更多论文

酸化预处理对酸化厨余两相厌氧消化的影响

酸化厨余会严重干扰厌氧消化，因此需要有效的解决方案来减轻其影响。本研究提出了一种利用酸化污泥预处理酸化厨余的方法，从而显著提高水解和产酸效率。经过酸化预处理后，水解效率从 64.54% 提高到 96.51%，酸化效率从 34.82% 提高到 49.95%。此外，酸化预处理组的短链脂肪酸浓度和产氢量分别增加了 45.89 % 和 48.67 %。预处理组的生化甲烷潜力为 512.84 ± 13.73 mL/（g 挥发性悬浮固体），比对照组高出 35.77%。机理分析表明，酸化污泥中乳酸脱氢酶相关基因的丰度较高，促进了乳酸的快速降解。此外，酸化污泥中丰富的丁酸梭菌促进了乳酸和其他有机物在厨余系统中定向转化为丁酸。这种高效的丁酸发酵改善了发酵环境，并为甲烷生产提供了丰富的底物。这项研究为提高酸化厨余的厌氧消化效率介绍了一种前景广阔的生物策略。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Waste management 环境科学-工程：环境

CiteScore

15.60

自引率

6.20%

发文量

492

审稿时长

39 days

期刊介绍： Waste Management is devoted to the presentation and discussion of information on solid wastes,it covers the entire lifecycle of solid. wastes. Scope: Addresses solid wastes in both industrialized and economically developing countries Covers various types of solid wastes, including: Municipal (e.g., residential, institutional, commercial, light industrial) Agricultural Special (e.g., C and D, healthcare, household hazardous wastes, sewage sludge)