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植物配置与进水碳氮比对沉水植物塘水质净化效果的影响
摘要点击 171  全文点击 76  投稿时间:2017-10-26  修订日期:2017-12-08
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中文关键词  沉水植物塘  植物配置  碳氮比  氮磷  污水处理
英文关键词  submerged macrophyte pond  plant combinations  C/N ratio  nitrogen and phosphorus  sewage treatment
作者单位E-mail
刘淼 中国科学院南京地理与湖泊研究所, 湖泊与环境国家重点实验室, 南京 210008
中国科学院大学, 北京 100049 
lium0509@126.com 
陈开宁 中国科学院南京地理与湖泊研究所, 湖泊与环境国家重点实验室, 南京 210008 knchen@niglas.ac.cn 
中文摘要
      将3种常见湖泊沉水植物苦草(Vallisneris spiralis)、轮叶黑藻(Hydrilla verticillata)、穗花狐尾藻(Myriophyllum spicatum)组合构建7种沉水植物稳定塘,分析植物组合对水体氮、磷、有机物去除效果;在此基础上,模拟不同碳氮比(C/N)条件下的沉水植物塘对污水的净化效果,进而探讨碳氮比对沉水植物去污效果的影响.结果表明:① 7种沉水植物组合对氮、磷均具有一定的净化效果,其中苦草和轮叶黑藻组成的沉水植物塘净化效果最好.② 3种C/N(1.89、5.93、12.09)条件下,苦草黑藻植物塘的去污效果有所差异,当C/N=5.93时,对污染物的综合去除效果最佳.因此对于沉水植物稳定塘而言,沉水植物组合能取得比单类植物更好的净水效果,并且通过添加适量碳源物质,调整污水的碳氮比,可以提升沉水植物塘的净水效果,研究结果对于实际工程构建稳定塘净化污水具有理论指导意义.
英文摘要
      A submerged macrophyte pond can effectively remove nitrogen and phosphorus from water, with the removal efficiencies for pollutants depending on combinations of submerged macrophytes. Moreover, the material structure of sewage also has a significant impact on the purification effect of the submerged macrophyte system. This experiment selected three submerged plants (Vallisneris spiralis, Hydrilla verticillata, and Myriophyllum spicatum) to examine the purification effect of their combinations on sewage, including nitrogen and phosphorus removal efficiencies. In addition, the effect of influent C/N ratio on the submerged macrophyte pond was also tested and discussed. The results showed the following. ① All plant combinations can decrease concentrations of nitrogen and phosphorus in water, resulting from nutrient deposition along with sedimentation of suspended particles. The combinations of Vallisneris spiralis and Hydrilla verticillata showed the highest purification efficiency for total nitrogen and total phosphorus with an average removal rate of 32.71% and 22.13%, respectively. ② The purification effects of three C/N ratio (1.89, 5.93, and 12.09) for Vallisneris spiralis and Hydrilla verticillate system were different. The removal efficiency was highest when the C/N ratio was 5.93, with removal rates for total nitrogen and total phosphorus and a reduction in permanganate index of 81.34%, 68.26%, and 88.65%, respectively. The C/N ratio affected the degradation of nitrogen, phosphorus, and organic matter by influencing the dissolved oxygen concentration of water and changing the anaerobic and aerobic environment of the water. In conclusion, different submerged macrophyte combinations showed better purification effect than a single type of plant in the submerged plant pond system. Changing the influent C/N ratio by placing carbon source materials into the water can greatly increase the removal efficiency of submerged plant pond, providing a practical reference for the use of submerged plant ponds to treat sewage.

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