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.
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Pena et al. (2016) studied this question.
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