RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2007, Vol. 16 >> Issue (3): 363-363.

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COMPARISON OF ORGANIC MATTER REMOVAL IN SUBSURFACE |HORIZONTAL FLOW WETLANDS BASED ON WATER BUDGET 

ZHANG Zheng1, FU Rongbing2, YANG Haizhen1, GU Guowei1   

  • Received:2006-05-29 Revised:2007-03-14 Online:2007-05-20

Abstract:

Planted with Phragmites australis and unplanted wetlands were constructed to compare organic matter removal from domestic wastewater based on water budget. Planted wetland had a removal rate of organic matter 2.2% lower than unplanted wetland in winter with plant harvested. In other seasons, the removal rate of CODCr in planted wetland was 3.2%～4.2% higher than that in unplanted wetland, while BOD\-5 was 1.8%～4.8% lower than that in unplanted wetland. Consequently, planted wetland showed a little well overall performance than unplanted, but the improvement was not obvious. Comparisons of paired systems commonly showed a little higher oxidation reduced potential (ORP) than unplanted wetland; however, the increase mainly concentrated on the range of top 15 cm water. From the overall bed, ORP is mostly similar for both wetlands with anaerobic condition. Bacteria, actinomice and fungi in wetlands substrate were monitored, and there was little difference between planted and unplanted wetlands. However, rhizosphere effect of reed was strong. Organic matter loading rate and removal rate showed obviously strong linear relationships (R2>0.96).

Key words: subsurface horizontalflow wetland, organic matter, water budget, oxidation reduction potential, microorganism

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