Rangel-Peraza J G, Mendivil-García K, Cedillo-Herrera C I G, Rochín-Medina J J, Rodríguez-Mata A E, Bustos-Terrones Y A
a División de Estudios de Posgrado e Investigación , Instituto Tecnológico de Culiacán , Culiacan , México.
Environ Technol. 2019 Feb;40(5):633-641. doi: 10.1080/09593330.2017.1400111. Epub 2017 Nov 15.
This study describes the optimization of the wastewater treatment process through the use of a free water surface flow constructed wetland with floating macrophytes at the laboratory level (20 L). A factorial design 2 was used in order to find the best operation conditions of the wastewater treatment process. The performance of macrophytes Eichhornia crassipes and Typha domingensis was investigated by operating the wetland system at hydraulic retention times of 2 and 4 days. The results showed an optimum operational condition that removed 92.39% of initial organic load (measured as COD). The nutrient removal efficiency of the constructed wetland was 99.28% for total nitrogen and 87.78% for phosphorus. The best operating condition includes the use of E. crassipes, with 4 days of hydraulic retention and the use of gravel as a filter. According to this, organic matter degradation kinetics was studied by the comparison of three kinetic models: first-order model, Stover-Kincannon model and Grau-second-order model. Stover-Kincannon and Grau kinetics models were more appropriate to represent the organic matter degradation kinetics in constructed wetland, with a determination coefficient of 0.9997. Based on the kinetic removal results, the process showed a maximum rate of organic load removal of 2500 mg/L d.
本研究描述了在实验室规模（20升）下，通过使用带有漂浮大型植物的自由水面流人工湿地来优化废水处理工艺。采用析因设计2来确定废水处理工艺的最佳运行条件。通过在水力停留时间为2天和4天的情况下运行湿地系统，研究了凤眼莲和香蒲这两种大型植物的性能。结果显示了一种最佳运行条件，该条件去除了92.39%的初始有机负荷（以化学需氧量衡量）。人工湿地对总氮的去除效率为99.28%，对磷的去除效率为87.78%。最佳运行条件包括使用凤眼莲、4天的水力停留时间以及使用砾石作为滤料。据此，通过比较三种动力学模型：一级模型、斯托弗 - 金坎农模型和格劳二级模型，研究了有机物降解动力学。斯托弗 - 金坎农模型和格劳动力学模型更适合表示人工湿地中有机物的降解动力学，决定系数为0.9997。基于动力学去除结果，该工艺显示出最大有机负荷去除速率为2500毫克/升·天。
