Araya F, Vera I, Sáez K, Vidal G
a Engineering and Environmental Biotechnology Group, Environmental Science Faculty and EULA-Chile Center , University of Concepción , Concepción , Chile.
b Centro de Investigación y Desarrollo en Recursos Hídricos (CIDERH) , Iquique , Chile.
Environ Technol. 2016;37(14):1811-20. doi: 10.1080/09593330.2015.1133715. Epub 2016 Feb 5.
The objective was to evaluate the effects of intermittent artificial aeration cycles and natural zeolite as a support medium, in addition to the contribution of plants (Schoenoplectus californicus) on NH4(+)-N removal during sewage treatment by Constructed Wetlands (CW). Two lines of Mesocosm Constructed Wetland (MCW) were installed: (a) gravel line (i.e. G-Line) and (b) zeolite line (i.e. Z-Line). Aeration increased the NH4(+)-N removal efficiency by 20-45% in the G-Line. Natural zeolite increased the NH4(+)-N removal efficiency by up to 60% in the Z-Line. Plants contributed 15-30% of the NH4(+)-N removal efficiency and no difference between the G-Line and the Z-Line. Conversely, the NH4(+)-N removal rate was shown to only increase with the use of natural zeolite. However, the MCW with natural zeolite, the NH4(+)-N removal rate showed a direct relationship only with the NH4(+)-N influent concentration. Additionally, relationship between the oxygen, energy and area regarding the NH4(+)-N removal efficiency was established for 2.5-12.5 gO2/(kWh-m(2)) in the G-Line and 0.1-2.6 gO2/(kWh-m(2)) in the Z-Line. Finally, it was established that a combination of natural zeolite as a support medium and the aeration strategy in a single CW could regenerate the zeolite's adsorption sites and maintain a given NH4(+)-N removal efficiency over time.
目的是评估间歇性人工曝气循环和天然沸石作为支撑介质的效果，以及植物（加州灯心草）对人工湿地（CW）污水处理过程中NH4(+)-N去除的贡献。安装了两条中尺度人工湿地（MCW）线路：（a）砾石线路（即G线路）和（b）沸石线路（即Z线路）。曝气使G线路中NH4(+)-N的去除效率提高了20%-45%。天然沸石使Z线路中NH4(+)-N的去除效率提高了高达60%。植物对NH4(+)-N去除效率的贡献为15%-30%，G线路和Z线路之间没有差异。相反，NH4(+)-N去除率仅在使用天然沸石时有所提高。然而，对于使用天然沸石的MCW，NH4(+)-N去除率仅与NH4(+)-N进水浓度呈直接关系。此外，确定了G线路中2.5-12.5 gO2/(kWh·m(2))和Z线路中0.1-2.6 gO2/(kWh·m(2))时，氧气、能量和面积与NH4(+)-N去除效率之间的关系。最后，确定在单个CW中，将天然沸石作为支撑介质与曝气策略相结合，可以使沸石的吸附位点再生，并随着时间的推移维持给定的NH4(+)-N去除效率。
