Universidad Tecnológica de Culiacán, Carretera Culiacán-Imala km. 2, Culiacán, Sinaloa, 80014, Mexico.
Tecnológico Nacional de México-División de Estudios de Posgrado e Investigación, Instituto Tecnológico de Culiacán. Juan de Dios Bátiz 310, Culiacán, Sinaloa, 80220, Mexico.
J Environ Manage. 2019 Apr 15;236:351-357. doi: 10.1016/j.jenvman.2019.01.114. Epub 2019 Feb 7.
The aim of this research was to evaluate a constructed wetland system (CW) operated under aerobic-anoxic-aerobic conditions to remove C, N and P from water with high concentrations of the last two nutrients. A series of three CW were operated continuously for 190 days. An aerobic vertical CW was used in the first and third stages and an anoxic horizontal CW was used in the second stage. The total nitrogen (TN) removal efficiency was 70 ± 1.5%. Similar removal efficiency behavior was observed in others nitrogen compounds, where a removal of 85 ± 1.5% for NO-N and 97 ± 2.2% for NHN were achieved. The combination of different oxygen conditions enhanced oxidation of nitrates and the assimilation of ammonium by vegetation. On the other hand, 54 ± 6.5% total phosphorus (TP) was removed in the entire system, which is higher than the reported in several investigations, including mechanized and controlled systems such as activated sludge. The phosphorous removal efficiency was attributed to the adequate design and configuration of CW, which facilitated dissolved oxygen (DO) conditions required for phosphorus capture. Despite in this investigation the CW was not designed for an optimal removal of organic matter the removal efficiency of this parameter was 64 ± 7.5%. The successful results suggest that the combination of aerobic-anoxic-aerobic stages is a technically suitable option for the treatment of agricultural wastewater with high content of N and P.
本研究旨在评估一种构建湿地系统（CW），该系统在有氧-缺氧-有氧条件下运行，以去除高浓度的最后两种营养物质（即碳、氮和磷）的水中的 C、N 和 P。连续运行了三个 CW，每个连续运行 190 天。第一阶段和第三阶段使用有氧垂直 CW，第二阶段使用缺氧水平 CW。总氮（TN）去除效率为 70±1.5%。其他氮化合物的去除效率也类似，其中硝酸盐氮的去除效率为 85±1.5%，氨氮的去除效率为 97±2.2%。不同氧气条件的结合增强了硝酸盐的氧化和植被对铵的同化。另一方面，整个系统去除了 54±6.5%的总磷（TP），高于包括活性污泥在内的一些机械化和控制系统的报道。磷的去除效率归因于 CW 的适当设计和配置，这有利于溶解氧（DO）条件的形成，从而有利于磷的捕获。尽管在本研究中，CW 不是为了最佳去除有机物而设计的，但该参数的去除效率仍为 64±7.5%。成功的结果表明，有氧-缺氧-有氧阶段的组合是处理高浓度 N 和 P 的农业废水的技术上合适的选择。
