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 specificproduction, 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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机译：在过去的几十年中，植物净化已被认为是处理废水的有效技术。本研究报告了使用Lemna minor对猪废水进行实验室规模的净化分析。在猪废水中观察到的最高生长速率为3.1±0.3 gDW m-2 day-1，最高的氮和磷吸收量分别为140 mg N m-2 day-1和3.47 mg P m-2 day-1。猪废水分析中的化学需氧量去除效率为58.9±2.0％。此外，还评估了通过厌氧与猪废水共消化的生物质增值。结果表明，与单底物厌氧消化相比，比甲烷产率明显提高（约40％）。每升预处理猪废水含100克浮萍的混合物获得的最高甲烷比产量为131.0±0.8 mL CH4 g-1化学需氧量。水-营养物-能量联系方法对猪废物管理显示出了希望。
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