Abstract Anaerobic digester effluent contains high concentrations of nutrients and other contaminants and has low dissolved oxygen. While there is increased interest nowadays in using constructed wetlands to treat wastewater, the ability of the wetland plants to grow in these stressful conditions is scantily investigated. Hence, this research investigated the growth performance of two tropical wetland species (Cyperus involucratus and Thalia geniculata) in anaerobic digester effluent and assessed their potential for treating the wastewater. Both C. involucratus and T. geniculata grew well in the wastewater probably because of aerenchyma development (28% air-space tissue) in the roots and radial oxygen loss from the roots. The pollutant level in the anaerobic digester effluent was significantly reduced with high removals of BOD (96–100%) and COD (69–73%). The remove of nutrients differed between species. T. geniculata had the better removal of PO4-P (48%), whereas C. involucratus had the better removal of NH4-N (99% in 28 days) and inorganic N (64% in 56 days). The removal of TSS (87–88%), EC (36–38%) and TDS (51–54%) in the systems were not significantly different between the two species. The study suggests that C. involucratus is a good candidate species for N removal in constructed wetlands whereas T. geniculata is better for removal of P.

中文翻译：

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厌氧消化池出水中热带湿地物种（Cyperus involucratus Rottb. 和 Thalia geniculata L.）的生长性能及其水处理效率

摘要 厌氧消化池出水含有高浓度的营养物质和其他污染物，溶解氧含量低。虽然现在人们对使用人工湿地处理废水越来越感兴趣，但对湿地植物在这些压力条件下生长的能力的研究却很少。因此，本研究调查了两种热带湿地物种（Cyperus involucratus 和 Thalia geniculata）在厌氧消化池流出物中的生长性能，并评估了它们处理废水的潜力。C. involucratus 和 T. geniculata 在废水中都生长良好，这可能是因为根部的通气组织发育（28% 的气隙组织）和根部的径向氧气损失。随着 BOD (96–100%) 和 COD (69–73%) 的高去除率，厌氧消化池流出物中的污染物水平显着降低。养分的去除因物种而异。T. geniculata 对 PO4-P 的去除效果更好（48%），而 C. involucratus 对 NH4-N（28 天 99%）和无机 N（56 天 64%）的去除效果更好。系统中 TSS (87–88%)、EC (36–38%) 和 TDS (51–54%) 的去除在两个物种之间没有显着差异。该研究表明，C. involucratus 是人工湿地中去除 N 的良好候选物种，而 T. geniculata 更适合去除 P. 系统中 TSS (87–88%)、EC (36–38%) 和 TDS (51–54%) 的去除在两个物种之间没有显着差异。该研究表明，C. involucratus 是人工湿地中去除 N 的良好候选物种，而 T. geniculata 更适合去除 P. 系统中 TSS (87–88%)、EC (36–38%) 和 TDS (51–54%) 的去除在两个物种之间没有显着差异。该研究表明，C. involucratus 是人工湿地中去除 N 的良好候选物种，而 T. geniculata 更适合去除 P.