Department of Civil Engineering, Ahsanullah University of Science and Technology, Dhaka, Bangladesh.
Bioresour Technol. 2013 Jan;128:438-47. doi: 10.1016/j.biortech.2012.10.052. Epub 2012 Oct 23.
This paper reports the pollutant removal efficiencies of two lab-scale hybrid wetland systems treating a textile wastewater. The two systems had identical configurations, each consisting of a vertical flow (VF) and a horizontal flow (HF) wetland that were filled with organic sugarcane bagasse and sylhet sand as the main media. The systems were operated under high hydraulic loading (HL) (566-5660 mm/d), and inorganic nitrogen (254-508 gN/m(2) d) and organics loadings (9840-19680 g COD/m(2) d and 2154-4307 g BOD(5)/m(2) d). Simultaneous removals of BOD(5) (74-79%) and ammonia (59-66%) were obtained in the first stage VF wetlands, demonstrating the efficiency of the media for oxygen transfer to cope with the high pollutant loads. The organic carbon (C) content of sugarcane bagasse facilitated denitrification in the VF wetlands. Second stage HF wetlands provided efficient color removal under predominantly anaerobic condition. Overall, the wetland systems showed stable removal performances under high, and unsteady, pollutant loadings.
本文报道了两种实验室规模的混合湿地系统处理纺织废水的污染物去除效率。这两个系统具有相同的配置，每个系统都由一个垂直流（VF）和一个水平流（HF）湿地组成，填充的主要介质是有机甘蔗渣和锡尔赫特砂。系统在高水力负荷（HL）（566-5660mm/d）下运行，并承受无机氮（254-508gN/m(2)d）和有机物负荷（9840-19680gCOD/m(2)d 和 2154-4307gBOD(5)/m(2)d）。在第一阶段的 VF 湿地中，BOD(5)（74-79%）和氨（59-66%）的同步去除效果良好，证明了该介质在应对高污染物负荷时具有良好的传氧能力。甘蔗渣中的有机碳（C）含量促进了 VF 湿地中的反硝化作用。第二阶段的 HF 湿地在主要厌氧条件下提供了高效的色度去除效果。总体而言，湿地系统在高且不稳定的污染物负荷下表现出稳定的去除性能。
