Nutrient concentration variations during Oenanthe javanica growth and decayin the ecological floating bed system
Xiaohong Zhou , GuoxiangWang
DOI:
Received December 24, 2009,Revised June 09, 2010, Accepted , Available online
Volume 22,2010,Pages 1710-1717
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The ecological floating bed system is a natural alternative to technical methods of wastewater treatment and involves complex
processes induced by plants or microorganisms in the wastewater. This study aimed to identify nutrient concentration variations during
Oenanthe javanica (Blume) DC growth and decay in the ecological floating bed system. Results showed that the third-order polynomial
equation was suitable to describe pollutant concentration changes, showing that the effect of O. javanica ecological floating bed system
on polluted water could be divided into the purification phase and decay phase. During the purification phase, nutrient concentrations
rapidly decreased because O. javanica influenced water microbial communities and water physical parameters (i.e., dissolved oxygen,
pH, and temperature), and had a direct uptake of nutrients. However, during the decay phase, nitrogen and phosphorus concentrations
in the plant tissues decreased, and these lost nutrients ultimately transferred to water and led to water quality deterioration. Results
also showed that the uptake and storage of O. javanica in nutrients were temporary and the plant served only as media of the nutrients
removed from the water. Under these circumstances, harvesting was an appropriate intervention to improve the treatment efficiency of
O. javanica ecological floating bed system.
