Potential of Duckweed for Swine Wastewater Nutrient removal and Biomass Valorisation through Anaerobic Co-digestion

Journal of Sustainable Development of Energy, Water and Environment Systems

Luis Pena¹  Margarida Oliveira²  Elizabeth Duarte²  Rita Fragoso² 

[1] Instituto Superior de Agronomia, University of Lisbon, Tapada da Ajuda 1349-017, Lisboa, Portugal;Linking Landscape, Environment, Agriculture and Food (LEAF), Research Centre, Instituto Superior de Agronomia, University of Lisbon, Tapada da Ajuda 1349-017, Lisboa, Portugal;

关键词: Anaerobic co-digestion;    Biogas;    Biomass production;    Duckweed;    Lemna minor;    Swine slurry.;   

DOI  :  10.13044/j.sdewes.d5.0137

来源: DOAJ

【 摘 要 】

Over the last decades, phytodepuration has been considered an efficient technology to treat wastewaters. The present study reports a bench scale depuration assay of swine wastewater using Lemna minor. The highest observed growth rate obtained in swine wastewater was 3.1 ± 0.3 gDW m−2 day−1 and the highest nitrogen and phosphorus uptake were 140 mg N m−2 day−1 and 3.47 mg P m−2 day−1, respectively. The chemical oxygen demand removal efficiency in the swine wastewater assay was 58.9 ± 2.0%. Furthermore, the biomass valorisation by anaerobic co-digestion with swine wastewater was assessed. Results showed a clear improvement in specific methane production rate (around 40%) when compared to mono-substrate anaerobic digestion. The highest methane specific production, 131.0 ± 0.8 mL CH4 g−1 chemical oxygen demand, was obtained with a mixture containing 100 g of duckweed per liter of pre-treated swine wastewater. The water-nutrients-energy nexus approach showed to be promising for swine waste management.

【 授权许可】

Unknown