Soares Jaqueline Dos Santos, Matos Mateus Pimentel de, Matos Antonio Teixeira de, Barbosa Mateus Henrique, Alves Stephani Moreira, Fia Fátima Resende Luiz, Crippa Rodolfo Appoloni
Department of Environmental Engineering, Federal University of Lavras, Lavras, Minas Gerais, Brazil.
Department of Sanitary and Environmental Engineering, Federal University of Minas Gerais, Belo Horizonte, Minas Gerais, Brazil.
Int J Phytoremediation. 2025;27(11):1569-1578. doi: 10.1080/15226514.2025.2511147. Epub 2025 Jun 23.
The aim of this study was to evaluate the effect of different hydraulic retention time (HRT) in Bio-rack Wetland Systems (BRWSs) planted with vetiver grass in tropical climate. For this purpose, four BRWSs were built on an experimental scale with HRTs of 6, 12, 24 and 48 h, denoted BRWSs A, B, C, and D, respectively. The removal efficiencies for BRWSs A, B, C, and D reached 27, 50, 58 and 67% for biochemical oxygen demand (BOD); 20, 29, 65, and 74% of chemical oxygen demand (COD); 1.1, 11, 15 and 32% of total Kjeldahl nitrogen (TKN); 1.4, 12, 18 and 29% of total phosphorus (TP); and 0.01, 0.1, 0.3, and 0.8 log units of thermotolerant coliforms (C), respectively. Based on results, BRWS D showed statistically greater performance than BRWS A for BOD, COD, TP, and CTher and efficiencies were similar to those typical found in septic tanks (with BRWS D being more effective), being able to be used for decentralized wastewater treatment. The high variability in sewage characteristics may have resulted in limitations in detecting statistical differences between treatments. From regression analysis, there is a suggestion that the HRT of 38 h would provide the best results.
本研究的目的是评估在热带气候下种植香根草的生物架湿地系统（BRWSs）中不同水力停留时间（HRT）的效果。为此，在实验规模上建造了四个BRWSs，水力停留时间分别为6、12、24和48小时，分别表示为BRWSs A、B、C和D。BRWSs A、B、C和D对生化需氧量（BOD）的去除效率分别达到27%、50%、58%和67%；对化学需氧量（COD）的去除效率分别为20%、29%、65%和74%；对总凯氏氮（TKN）的去除效率分别为1.1%、11%、15%和32%；对总磷（TP）的去除效率分别为1.4%、12%、18%和29%；对耐热大肠菌群（C）的去除对数单位分别为0.01、0.1、0.3和0.8。基于结果，BRWS D在BOD、COD、TP和耐热大肠菌群（CTher）方面的表现统计学上显著优于BRWS A，且效率与化粪池中的典型效率相似（BRWS D更有效），能够用于分散式污水处理。污水特性的高变异性可能导致在检测处理之间的统计差异方面存在局限性。从回归分析来看，有迹象表明38小时的水力停留时间将提供最佳结果。
