组合生态系统去除农村生活污水中氮磷效果研究

Study on Nitrogen And Phosphorus Removal Characteristics of Combined Ecosystem Treating Rural Domestic Wastewater

探讨"水生植物滤床串联潜流人工湿地"组合生态工艺对农村生活污水尾水中氮磷去除效果及其植物吸收对脱氮除磷的贡献。结果表明,夏秋季组合生态系统对NH+4-N、TN和TP的去除率平均分别达到了82.5%、56.0%和63.2%;潜流湿地中沿程TN和TP含量下降幅度较滤床中更大,说明潜流人工湿地脱氮除磷效果较滤床更优;大叶特白空心菜和水稻"苏香梗2号"2种植物体内全氮含量均高于全磷含量,且空心菜中全氮、全磷含量高于水稻,植物吸收对组合生态系统脱氮除磷的贡献率分别为6.9%、21.5%。综合分析认为,生物量大、根系发达、叶片面积大且收割茬数多的植物为人工湿地的优选。

The research on ecological treatment process of rural domestic wastewater is aim to investigate the nitrogen and phosphorus removal characteristics of combined ecosystem which is called ＂aquatic plant filter bed links to subsurface-flow constructed wetland＂ and analyze the contribution of plants absorption to the removal of nitrogen and phosphorus. Average removal rates of NH4＋-N, TN and TP by combined ecosystem of summer and autumn are 82.5%, 56.0% and 63.2%, respectively. The trend of content variation of NH4＋-N, TN and TP along the path is declined and the downtrend of TN and TP is more obvious atter entering the subsurface-flow constructed wetland. Nitrogen of two plants is higher than phosphorus when the nitrogen and phosphorus of water spinach are all exceeding the rice ＂Su Xiang Geng 2＂. The contribution rates of plants absorption to the removal of nitrogen and phosphorus are 7.0% and 23.7% in the combined ecosystem. Comprehensive analysis shows that the plants with large biomass, multiple roots, big areas of leaves and harvest more times are the optimal choices in the wetland.