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<p>Growing global pork production has led to challenges in swine manure management, and anaerobic digestion (AD) with biochar as an electron-conductive material offers a sustainable solution by enhancing methane yields, supporting nutrient recycling, and reducing environmental impacts. This study examines the enhancement of methane production in semi-solid AD of swine manure by adding biochar as an electron-conductive material in a batch mode at 37&#xa0;°C. Biochars derived from swine manure (SMB) and coconut shell (CSB) were compared to commercial granular activated carbon (GAC) for their impact on methane yield and process stability. Biochar, particularly SMB, increased methane production by up to 1.9 times (from 50 to 146&#xa0;mL/gVS) compared to control samples at 15% total solid (TS), offering a more economical and sustainable alternative to GAC. For 10% TS, this increase was 1.3 times (from 43 to 97&#xa0;mL/gVS). Microbial analysis showed that biochar additions enriched key bacteria (<i>Clostridium </i>sensu stricto<i> 1</i>), which facilitated direct interspecies electron transfer (DIET) with archaea (<i>Methanobacterium</i>), accelerating methanogenesis and improving AD kinetics by reducing the lag phase from approximately 52 to 35&#xa0;days at 10% TS and from 42 to 14&#xa0;days at 15% TS. These findings underscore biochar’s promise as a cost-effective, sustainable additive, advancing methane production and closed-loop swine manure management.</p>

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Upgrading semi-solid anaerobic digestion of swine manure through the biochar addition as an electron-conductive material

  • 期刊论文

  • 发表日期：

    2025年8月5日

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  • A. de Sousa e Silva,
  • A. L. M. dos Santos,
  • B. H. A. Girão,
  • I. C. C. Malveira,
  • V. E. P. S. G. da Silva,
  • A. F. J. Uchoa,
  • A. B. dos Santos

摘要

Growing global pork production has led to challenges in swine manure management, and anaerobic digestion (AD) with biochar as an electron-conductive material offers a sustainable solution by enhancing methane yields, supporting nutrient recycling, and reducing environmental impacts. This study examines the enhancement of methane production in semi-solid AD of swine manure by adding biochar as an electron-conductive material in a batch mode at 37 °C. Biochars derived from swine manure (SMB) and coconut shell (CSB) were compared to commercial granular activated carbon (GAC) for their impact on methane yield and process stability. Biochar, particularly SMB, increased methane production by up to 1.9 times (from 50 to 146 mL/gVS) compared to control samples at 15% total solid (TS), offering a more economical and sustainable alternative to GAC. For 10% TS, this increase was 1.3 times (from 43 to 97 mL/gVS). Microbial analysis showed that biochar additions enriched key bacteria (Clostridium sensu stricto 1), which facilitated direct interspecies electron transfer (DIET) with archaea (Methanobacterium), accelerating methanogenesis and improving AD kinetics by reducing the lag phase from approximately 52 to 35 days at 10% TS and from 42 to 14 days at 15% TS. These findings underscore biochar’s promise as a cost-effective, sustainable additive, advancing methane production and closed-loop swine manure management.