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Effect on polluted water purification by eight emergent plants

SUN Ruilian 1,2， ZHANG Jian 3， WANG Wenxing 1   

  1. 1. Environment Research Institute, Shandong University, Jinan 250100, Shandong, China;
    2. College of Life Science, Shandong University, Jinan 250100, Shandong, China;
    3. College of Environmental Sciences and Engineering, Shandong University, Jinan 250100, Shandong, China
  • Received:2008-09-23 Revised:1900-01-01 Online:2009-01-24 Published:2010-04-15
  • Contact: SUN Ruilian

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Abstract: Potculture experiments were conducted to study the effects of eight emergent plants on purifying polluted water under different hydraulic retention times. Results showed that the purifying effects on pollutants were different among eight emergent plants and removal efficiency increased with hydraulic retention time. All plants had significant improvement for COD removal except Sparganium stenophyllum Maxim, when hydraulic retention time was 5 days. The COD removal efficiencies of Acorus calamus L., Scirpus validus Vahl, Typha latifolia L. and Iris wilsonii C. H. Wright were all about 90%, which were higher than those of the other plants. When the hydraulic retention time was 7 days, the removal efficiencies of eight plants for NH+4N and TN increased by 15.0%～41.8% and 6.7%～25.1% respectively as compared with the control. Iris wilsonii C. H. Wright, Zizania latifolia Turcz. and Typha latifolia L. showed excellent removal capacities of NH+4N and TN. TP removal efficiencies by Zizania latifolia Turcz. and Typha latifolia L. were significantly higher than that of control, the increased removal efficiencies for TP were 10.8% and 11.2% respectively. These results indicated that Iris wilsonii C. H. Wright, Zizania latifolia Turcz. and Typha latifolia L. could be selected for constructing wetland hydrophytes in Nansi Lake.

Key words: constructed wetland, emergent plants, polluted water, purification

CLC Number: 

  • X703
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