Integration of biogas and liquid recirculation enhance methane production in high-solid anaerobic digestion of pig manure and rice husks

IF 9.7 1区环境科学与生态学 Q1 AGRICULTURAL ENGINEERING

Bioresource Technology Pub Date : 2024-11-13 DOI:10.1016/j.biortech.2024.131807

Zhuoqi Xu , Wenbo Gu , Yuwei Shi , Baibing Li , Zhenya Zhang , Zhongfang Lei , Tian Yuan , Yanfei Cheng , Mijung Kim , Akio Shoji

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Abstract

High-solid anaerobic digestion (HSAD) is a promising technology for treating livestock manure and agricultural waste; however, the wide application has been limited due to homogenization problems. This study established a novel HSAD system by integrating liquid and biogas recirculation (R_BL), aiming to enhance the biogas conversion efficiency of high-solid substrates at low costs. Results showed that the highest methane yield was 357 mL/gVS_added in the novel HSAD system (R_BL), 30.7 % and 251.7 % higher than those with only liquid recirculation (R_L) or with no recirculation (R_No). Biogas recirculation helped enhance dissolution and degradation of organic matter, and prevented the VFAs accumulation, contributing to the enhanced methane production in the novel HSAD system. The net electric energy benefit of R_BL was 301.2 kWh for treating 1-ton raw materials, suggesting the high economic feasibility of the novel HSAD system for the sustainable treatment of high-solid organic wastes.

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在猪粪和稻壳的高固体厌氧消化过程中，沼气和液体循环的结合提高了甲烷产量。

高固体厌氧消化（HSAD）是一种处理畜禽粪便和农业废弃物的前景广阔的技术；然而，由于均质问题，其广泛应用受到了限制。本研究通过整合液体和沼气再循环（RBL）建立了一种新型 HSAD 系统，旨在以较低的成本提高高固体基质的沼气转化效率。结果表明，新型 HSAD 系统（RBL）的甲烷产量最高，达到 357 mL/gVSadded，比只有液体再循环（RL）或没有再循环（RNo）的系统分别高出 30.7% 和 251.7%。沼气再循环有助于提高有机物的溶解和降解，防止 VFAs 的积累，从而提高了新型 HSAD 系统的甲烷产量。在处理 1 吨原料时，RBL 的净电能效益为 301.2 千瓦时，这表明新型 HSAD 系统在可持续处理高固体有机废物方面具有很高的经济可行性。

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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.