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<p>The liquid fraction of digestate from biogas production can have varying agricultural impacts, influenced by the type of feedstock and the processing methods used. This study evaluated digestates obtained from pig manure, supplemented with co-substrates such as vicia/rye silage (EN), corn/sorghum silage (BE), and residues from dairy production, slaughter, and peanut processing (3C). Moreover, the impact of post-anaerobic stabilization of the liquid fraction of digestate was evaluated. The physical, chemical, and microbiological characteristics of the liquid fractions (LFs), both before and after the post-anaerobic stabilization process (SLFs) (SLFs), were analyzed. Phytotoxicity tests on Lactuca sativa and Raphanus sativus revealed a significant inhibitory effect of LFs at concentrations above 10% w/w, while SLFs exhibited reduced inhibition. Principal Component Analysis (PCA) identified negative correlations between phytotoxicity indices and physicochemical variables such as conductivity, volatile fatty acids (VFA), total ammonia nitrogen (TAN), and total alkalinity (TA), that these factors contribute significantly to phytotoxicity. Among the LFs and SLFs, the stabilized digestate from pig manure digestion with vicia/rye silage demonstrated the most favorable potential for plant growth, attributed to its balanced nutrient content and low toxicity. In the liquid fractions obtained from the co-digestion of pig manure with maize/sorghum silage or vicia/rye silage, Clostridiales species were the most abundant, consistent with their known role in lignocellulose decomposition and their possible contribution to nutrient cycling processes of agronomic relevance, such as carbon turnover and, in some cases, nitrogen fixation or phosphate solubilization. This study underscores the importance of stabilizing digestate and understanding its microbial and chemical characteristics to optimize its use as a soil amendment. These findings contribute to the development of targeted application strategies, maximizing agricultural benefits while minimizing environmental risks.</p>

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Physicochemical, phytotoxic and microbiological evaluation of liquid digestates derived from pig manure before and after post-anaerobic stabilization for agricultural use

  • 期刊论文

  • 发表日期：

    2026年5月13日

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  • María José Galván,
  • Francisco Massello,
  • Analía Becker,
  • Micaela Manzotti,
  • Mariano Bruno

摘要

The liquid fraction of digestate from biogas production can have varying agricultural impacts, influenced by the type of feedstock and the processing methods used. This study evaluated digestates obtained from pig manure, supplemented with co-substrates such as vicia/rye silage (EN), corn/sorghum silage (BE), and residues from dairy production, slaughter, and peanut processing (3C). Moreover, the impact of post-anaerobic stabilization of the liquid fraction of digestate was evaluated. The physical, chemical, and microbiological characteristics of the liquid fractions (LFs), both before and after the post-anaerobic stabilization process (SLFs) (SLFs), were analyzed. Phytotoxicity tests on Lactuca sativa and Raphanus sativus revealed a significant inhibitory effect of LFs at concentrations above 10% w/w, while SLFs exhibited reduced inhibition. Principal Component Analysis (PCA) identified negative correlations between phytotoxicity indices and physicochemical variables such as conductivity, volatile fatty acids (VFA), total ammonia nitrogen (TAN), and total alkalinity (TA), that these factors contribute significantly to phytotoxicity. Among the LFs and SLFs, the stabilized digestate from pig manure digestion with vicia/rye silage demonstrated the most favorable potential for plant growth, attributed to its balanced nutrient content and low toxicity. In the liquid fractions obtained from the co-digestion of pig manure with maize/sorghum silage or vicia/rye silage, Clostridiales species were the most abundant, consistent with their known role in lignocellulose decomposition and their possible contribution to nutrient cycling processes of agronomic relevance, such as carbon turnover and, in some cases, nitrogen fixation or phosphate solubilization. This study underscores the importance of stabilizing digestate and understanding its microbial and chemical characteristics to optimize its use as a soil amendment. These findings contribute to the development of targeted application strategies, maximizing agricultural benefits while minimizing environmental risks.