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<p>High chitin content in shrimp chaff (SC) is a rate-limiting factor during anaerobic digestion (AD) and requires specific chitinases for its degradation. The augmentation of chitinase-producing bacteria can potentially promote SC degradation and biogas production. This study proposed the anaerobic co-digestion of SC and corn straw (CS) supplemented with <i>Serratia marcescens</i> ATCC-8100 at different doses. Bioaugmentation with <i>S. marcescens</i> resulted in the highest biogas production (1.38-fold) in SC + CS<sub>B50%</sub> reactors with 89.97% volatile solids removal, followed by SC + CS<sub>B10%</sub> (1.28-fold), compared to the control. Dominant bacteria phyla were the <i>Bacteroidetes</i>,<i> Firmicutes</i>,<i> Proteobacteria</i>, and <i>Spirochaetota</i>. <i>Herbinix</i>, a cellulose-degrading and acetate-producing bacterium, increased significantly (<i>p</i> ≤ 0.05) from 5.99% to 29.49% in the SC + CS<sub>B50%</sub> compared to the control. <i>Sedimentibacter</i> is an amino acid-utilizing bacterium, also enhanced from 4.00 to 8.09% with bioaugmentation. <i>Methanobrevibacter</i>. <i>Methanosarcina</i>, <i>Bathyarchaeia</i>, <i>Candidatus_Methanogranum</i>, and <i>RumEn_M2</i> were the dominant archaeal genera. <i>Methanobrevibacter</i>, the predominant archaea that convert hydrogen to methane, increased from 42.515 to 68.60% in SC + CS<sub>B50%</sub>. <i>Serratia marcescens</i> bioaugmentation in the co-digestion improves the core degrading bacteria and archaea to enhance biogas production.</p> Graphical abstract <p></p>

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Anaerobic co-digestion of shrimp chaff and lignocellulosic biomass via hydrolytic bacteria: Enhanced biogas production and microbial community

  • 期刊论文

  • 发表日期：

    2025年12月15日

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  • Gohar Ali,
  • Ali S. Alkorbi,
  • Mohammed Jalalah,
  • Farid A. Harraz,
  • Zhenmin M. Ling,
  • Irfan Saif,
  • Abdulaziz R. Alqahtani,
  • El-Sayed Salama,
  • Xiangkai Li

摘要

High chitin content in shrimp chaff (SC) is a rate-limiting factor during anaerobic digestion (AD) and requires specific chitinases for its degradation. The augmentation of chitinase-producing bacteria can potentially promote SC degradation and biogas production. This study proposed the anaerobic co-digestion of SC and corn straw (CS) supplemented with Serratia marcescens ATCC-8100 at different doses. Bioaugmentation with S. marcescens resulted in the highest biogas production (1.38-fold) in SC + CSB50% reactors with 89.97% volatile solids removal, followed by SC + CSB10% (1.28-fold), compared to the control. Dominant bacteria phyla were the Bacteroidetes, Firmicutes, Proteobacteria, and Spirochaetota. Herbinix, a cellulose-degrading and acetate-producing bacterium, increased significantly (p ≤ 0.05) from 5.99% to 29.49% in the SC + CSB50% compared to the control. Sedimentibacter is an amino acid-utilizing bacterium, also enhanced from 4.00 to 8.09% with bioaugmentation. Methanobrevibacter. Methanosarcina, Bathyarchaeia, Candidatus_Methanogranum, and RumEn_M2 were the dominant archaeal genera. Methanobrevibacter, the predominant archaea that convert hydrogen to methane, increased from 42.515 to 68.60% in SC + CSB50%. Serratia marcescens bioaugmentation in the co-digestion improves the core degrading bacteria and archaea to enhance biogas production.

Graphical abstract