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首页> 外文期刊>Journal of Environmental Science and Health >Treatment of landfill leachate with high levels of ammonia by constructed wetland systems
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Treatment of landfill leachate with high levels of ammonia by constructed wetland systems

机译：人工湿地系统处理含氨量高的垃圾渗滤液

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Landfill leachate treatment can be expensive and energy-intensive when achieved in advanced wastewater treatment plants. One possible method to reduce cost and energy requirements is to treat the leachate on-site using constructed wetlands. In this study, we investigated the feasibility of treating the leachate from a 10-year-old landfill site, with high levels of ammonia, by lab-scale constructed wetland microcosms. Five different types of wetland systems were used in the test: PI, P2 and CS-1 systems fed by original leachate, P3 and CS-2 systems fed by secondarily treated leachate. The CS systems were used as control without vegetation. Each system contained two basins connected in series: one installed as free water surface (FWS) wetland microcosm, and the other as subsurface flow (SSF) wetland microcosm. After one year of operation, the experimental results showed that P2 system performed better than both PI and P3 systems by comparing their removal efficiencies of ammonia, which were measured equal to 94%, 84% and 60%, respectively. However, for total nitrogen removal, all three systems exhibited lower values, which meant that the process denitrification was insignificant in the wetland systems treating aged leachate. According to the experimental results of adding extra BOD into the systems, we found that the reason was due to lack of organic carbon sources in aged leachate for denitrification, which might cause nitrate buildup in the effluents.
机译：在先进的废水处理厂中实现垃圾填埋场渗滤液处理可能既昂贵又耗能。降低成本和能源需求的一种可能方法是使用人工湿地现场处理渗滤液。在这项研究中，我们通过实验室规模的人工湿地缩微技术研究了处理具有10年历史的垃圾填埋场，含氨量高的渗滤液的可行性。测试中使用了五种不同类型的湿地系统：由原始渗滤液供入的PI，P2和CS-1系统，由二次处理渗滤液供入的P3和CS-2系统。 CS系统用作无植被的对照。每个系统包含两个串联连接的盆地：一个作为自由水面（FWS）湿地缩微安装，另一个作为地下流量（SSF）湿地缩微安装。经过一年的运行，实验结果表明，P2系统的性能优于PI和P3系统，方法是比较它们对氨的去除​​效率，分别为94％，84％和60％。但是，对于总氮去除而言，所有三个系统均显示出较低的值，这意味着在处理老化的渗滤液的湿地系统中，该工艺的反硝化作用微不足道。根据向系统中添加额外BOD的实验结果，我们发现原因是由于老化的渗滤液中缺乏用于反硝化的有机碳源，这可能导致废水中的硝酸盐积累。

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