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Evaluation of different substrates to support the growth of Typha latifolia in constructed wetlands treating tannery wastewater over long-term operation

机译:在长期运行的人工湿地处理制革废水中,评估不同的基质以支持香蒲的生长

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摘要

The aim of this study was to investigate the performance of horizontal subsurface flow constructed wetlands planted with Typha latifolia treating tannery wastewater under long-term operation. Two expanded clay aggregates (Filtralite® MR3–8-FMR and Filtralite® NR3–8-FNR) and a fine gravel-FG were used as substrate for the constructed wetland units plus one unit with FMR was left as an unvegetated control. The systems were subject to three hydraulic loadings, 18,8 and 6cm d⁻¹, and to periods of interruption in the feed. The relationship between the substrate, plant development and removal efficiency, especially of organic matter, was investigated. Organic loadings up to 1800 kg BOD5 ha⁻¹ d⁻¹ and 3849 kg COD ha⁻¹ d⁻¹ were applied leading to mass removals of up to 652 kg BOD₅ ha⁻¹ d⁻¹ and 1869 kg COD ha⁻¹ d⁻¹, respectively. The three different substrates were adequate for the establishment of T. latifolia,although the clay aggregates allowed for higher plant propagation levels. The units with FNR and FMR achieved significantly higher COD and BOD₅ removal when compared to the FG and to the unplanted units. The systems proved to be tolerant to high organic loadings and to interruptions in feed suggesting this technology as a viable option for the biological treatment of tannery wastewater.
机译:这项研究的目的是调查在长期运行下,用香蒲种植的水平地下流人工湿地处理制革废水的性能。将两种膨胀的粘土骨料(Filtralite®MR3-8-FMR和Filtralite®NR3-8-FNR)和细砾石FG用作人工湿地单元的基质,再加上一个带FMR的单元作为无植被对照。该系统承受了18、8和6cm d -1的三个水力负荷,并且进料中断了一段时间。研究了底物,植物发育和去除效率(尤其是有机物)之间的关系。施加高达1800 kg BOD5 ha -1 d¹和3849 kg COD ha -1 d¹的有机物,从而去除了652 kg BOD -1 d¹和1869 kg COD -1d⁻。 ¹。三种不同的基质足以用于建立T. latifolia,尽管粘土聚集体允许更高的植物繁殖水平。与FG和未种植的单元相比,带有FNR和FMR的单元的COD和BOD₅去除率明显更高。该系统被证明可以耐受高有机负荷和进料中断,这表明该技术是制革厂废水生物处理的可行选择。

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