Nutrient concentration variations during Oenanthe javanica growth and decay in the ecological floating bed system  

作　　者：Xiaohong Zhou Guoxiang Wang 

机构地区：[1]School of the Environment, Jiangsu University, Zhenjiang 212013, China. [2]Jiangsu Key Laboratory of Environmental Change and Ecological Construction, College of Geographical Science, Nanjing Normal University, Nanjing 210046, China

出　　处：《Journal of Environmental Sciences》2010年第11期1710-1717,共8页环境科学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.40873057);the Special of Science and Technology Innovation and Achievement Transformation of Jiangsu,China(No.BE2008677);the Natural Science Foundation for the Colleges and Universities in Jiangsu Province(No.10KJB610001);the Scientific Research Foundation for the Talents in Jiangsu University(No.09JDG050)

摘　　要：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.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.

关 键 词：Oenanthe javanica ecological floating bed PURIFICATION DECAY polluted water 

分 类 号：X24[环境科学与工程—环境科学] S792.39[农业科学—林木遗传育种]