Department of Agricultural and Biosystems Engineering, Landmark University, Omu-Aran, Nigeria.
Department of Agricultural and Environmental Engineering, Obafemi Awolowo University, Ile-Ife, Nigeria.
Environ Sci Pollut Res Int. 2020 Feb;27(4):4275-4283. doi: 10.1007/s11356-019-07095-6. Epub 2019 Dec 12.
A pilot-scale batch-flow free water surface (FWS) constructed wetland (CW) system planted with Rhynchospora corymbosa (L.) Britton was developed with a hydraulic retention time (HRT) of 2.5 days. The average porosity of the substrate was 0.55 and calculated hydraulic loading rate (HLR) was 3.96 (g BOD/m-day). Quantitative and qualitative characterization of the greywater were done. The concentrations of pollutants in the greywater before and after it was fed into the FWS CWs were measured using standard sampling and analyses methods. The average daily per capita water use estimated was 162 L, out of which 72.5 L was greywater. The mean removal efficiencies (RE) of the CWs were 81% COD, 85% TN, 82% TK, 10% TP, 0.2% pH, 81% TSS, Zn 91%, 81% Al, 94% Mg, and 90% Fe. It was observed that the FWS with batch-flow configuration tested in the study was slightly different in terms of results reported on the conventional continuous flow system. R. corymbosa as a macrophyte has roots that can provide a surface area for microbial growth and oxygen exchange and can be used as emergent macrophytes in phytoremediation of greywater. The result provided information on the performance and pollutant removal efficiency of a batch-operated FWS CW system planted with R. corymbosa.
采用水力停留时间（HRT）为 2.5 天，建立了一个规模为中试批流自由水面（FWS）人工湿地（CW）系统，种植了 Rhynchospora corymbosa（L.）Britton。基质的平均孔隙率为 0.55，计算的水力负荷率（HLR）为 3.96（g BOD/m-天）。对灰水进行了定量和定性特征描述。使用标准采样和分析方法测量灰水进入 FWS CW 前后的污染物浓度。估计的平均人均日用水量为 162 L，其中 72.5 L 为灰水。CW 的平均去除效率（RE）分别为 COD 81%、TN 85%、TK 82%、TP 10%、pH 值 0.2%、TSS 81%、Zn 91%、Al 81%、Mg 94%和 Fe 90%。研究中测试的批流配置 FWS 与传统连续流系统报告的结果略有不同。作为一种水生植物，R. corymbosa 的根系可以为微生物生长和氧气交换提供表面积，并可用作灰水植物修复中的挺水植物。研究结果提供了关于种植 R. corymbosa 的间歇操作 FWS CW 系统的性能和污染物去除效率的信息。
