Study On The Eco-island Remediation Technology In Eutrophic Water Bodies Of The Three Gorges Reservoir

The Three Gorges Project is a project broad in scale and with multi-goal of water resource exploration. After completing, it will bring a great economic benefit to flood prevention, electricity generation, and shipping and so on. However, the construction of Three Gorges Project has influenced the ecological environment of the Three Gorges Reservoir to some degree. After the water level of the Three Gorges Reservoir rising to 135 meters, it has been discovered that there appears the phenomenon of eutrophication to varying degrees in the backwater section of part of first-level rivers, which has aroused the general concern. The water eutrophication is not only one of the main issues of water pollution which the world is facing, but also a difficult problem of controlling the water pollution at home and abroad. Meanwhile, it is rather serious in China.The prevention and control of water eutrophication has passed through difficult courses from controlling nutrients, directly algae deletion to the bioregulation, the ecological engineering and the bioremediation and so on. The eco-island remediation technology is a breakthrough water remediation technology, which is rising in the world. It has some significance of using for reference in the prevention and controlling of water eutrophication in the Three Gorges reservoir .This paper has made a study on eco-island remediation technology in eutrophic water bodies of the Three Gorges Reservoir. By the way of simulating natural water bodies in the manual simulation pond, I has carried out eco-island experiment in three nutrients degree with low, middle and heavy respectively, and with three kinds of plants: mint, vetiver (Vetiveria zizanioides Nash), and rice. By monitoring each water quality index and the biological indicator, the three aspects have been analyzed, including the purification effects to the different water bodies of three kinds of eco-islands with different terrestrial plants, the connection among eutrophication relevance factors, the dynamic process of removing the total nitrogen(TN), the total phosphorus(TP) by eco-island, meanwhile, the environment and economic benefit have been analyzed separately.The experimental results indicate that, the three types of eco-island with mint, vetiver and rice can effectively remove TN and TP, restrain algae and improve the water transparency. Transparency and the chlorophyll-a had a remarkable negative correlation; COD and the chlorophyll-a had a positive correlation, the correlation between...