Study on the performance of HNO3-modified biochar for enhanced medium temperature anaerobic digestion of food waste

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

Waste management Pub Date : 2021-11-01 DOI:10.1016/j.wasman.2021.09.020

Biao Gao, Yu Wang, Lei Huang, Shiming Liu

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引用次数: 14

Abstract

Biochar can help promote direct interspecies electron transfer (DIET) and increase methane production; the surface redox groups play a constructive role in these processes. This study attempted to improve the anaerobic digestion (AD) performance by modifying biochar with HNO₃ to increase its redox activity. A comparative experimental study, raw biochar (BC0) and biochar treated with HNO₃ for 6 h (BC6), were conducted to investigate the effect of HNO₃ treatment on the medium temperature AD performance of food waste. Both BC0 and BC6 can enhance CH₄ yield and facilitate the degradation of volatile fatty acids. The enhanced yield of CH₄ was 36% for BC0 and 90% for BC6, respectively. Biochar can also enhance methanogenesis, presumably owing to direct interspecific electron transfer (DIET). Compared with BC0, BC6 had a higher redox activity and a smaller conductivity. It was supposed that BC0 mediated DIET through its conductivity, whereas BC6 accelerated DIET by surface redox groups.

Abstract Image

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hno3改性生物炭强化食物垃圾中温厌氧消化的性能研究

生物炭有助于促进种间直接电子转移(DIET)和增加甲烷产量;表面氧化还原基团在这些过程中发挥建设性作用。本研究试图通过对生物炭进行HNO3改性以提高其氧化还原活性来改善厌氧消化(AD)性能。以生生物炭(BC0)和HNO3处理6 h的生物炭(BC6)为实验对象，研究HNO3处理对食物垃圾中温AD性能的影响。BC0和BC6均能提高CH4产率，促进挥发性脂肪酸的降解。对BC0和BC6的CH4收率分别提高了36%和90%。生物炭也可以促进产甲烷，可能是由于直接种间电子转移(DIET)。与BC0相比，BC6具有更高的氧化还原活性和更小的电导率。推测BC0通过其电导率介导DIET，而BC6通过表面氧化还原基团加速DIET。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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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)