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The potential of anaerobic digestion (AD) regarding wastewater derived from swine production was evaluated in this work. Biochemical methane potential (BMP) assays were performed with raw and sieved swine slurry (rSS and sSS). Sieving was applied as a pre-treatment for solid-liquid separation. BMP values of 433 ± 8 L CH4/kg VS (volatile solids) with 87 ± 2% methanation and 214 ± 1 L CH4/kg VS with 39 ± 0% were obtained for rSS and sSS, respectively. Considering the higher BMP of rSS, AD of this waste was then conducted in semi-continuous reactors, operated at a hydraulic retention time of 20 days. During the first 30 days of operation, volatile fatty acids (VFA), mainly acetate and propionate, tended to accumulate. Biogas production was low but constant (i.e., 0.3 ± 0.1 L/d with 45 ± 13% CH4). After applying a batch period of 20 days, higher biogas production was attained, with higher methane content (0.8 ± 0.3 L/d with 72 ± 3% CH4). Higher VS and chemical oxygen demand (COD) removal were also achieved, and lower VFA concentrations were measured. In conclusion, AD can offer an integrated and sustainable management of swine wastewater, by decreasing its organic load and making it more suitable for further soil application, while contributing to minimize greenhouse gas emissions (GHG).

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Anaerobic Digestion of Swine Slurry for Treating Livestock Wastes While Reducing Greenhouse Gas Emissions

  • 会议论文

  • 发表日期：

    2026年

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  • Pedro Esperanço,
  • Luís Costa,
  • M. Salomé Duarte,
  • Verónica Oliveira,
  • António Ferreira,
  • Carla Rodrigues,
  • Ana Júlia Cavaleiro

摘要

The potential of anaerobic digestion (AD) regarding wastewater derived from swine production was evaluated in this work. Biochemical methane potential (BMP) assays were performed with raw and sieved swine slurry (rSS and sSS). Sieving was applied as a pre-treatment for solid-liquid separation. BMP values of 433 ± 8 L CH4/kg VS (volatile solids) with 87 ± 2% methanation and 214 ± 1 L CH4/kg VS with 39 ± 0% were obtained for rSS and sSS, respectively. Considering the higher BMP of rSS, AD of this waste was then conducted in semi-continuous reactors, operated at a hydraulic retention time of 20 days. During the first 30 days of operation, volatile fatty acids (VFA), mainly acetate and propionate, tended to accumulate. Biogas production was low but constant (i.e., 0.3 ± 0.1 L/d with 45 ± 13% CH4). After applying a batch period of 20 days, higher biogas production was attained, with higher methane content (0.8 ± 0.3 L/d with 72 ± 3% CH4). Higher VS and chemical oxygen demand (COD) removal were also achieved, and lower VFA concentrations were measured. In conclusion, AD can offer an integrated and sustainable management of swine wastewater, by decreasing its organic load and making it more suitable for further soil application, while contributing to minimize greenhouse gas emissions (GHG).