Research On The Treatment Of Eutrophic Water By Oenanthe Javanica Eco-floating Bed In Winter

In recent years, with the development of China’s economy, environmental problems become increasingly prominent, the eutrophication of lakes in China has attracted more and more attention. Ecological floating bed is an effective, economic water treatment technology and meets the requirements of the sustainable development, it has a very broad application prospects.Oenanthe javanica ecological floating beds with different matrixes、carriers and densities were employed to examine their purification efficiencies on eutrophic water in low temperature condition in winter. This experiment has a certain instruction meaning to the practical application and combination of ecological floating bed technology, providing theoretical basis for subsequent and relevant research. The main research results are as follows:(1)Through the oenanthe javanica eco-floating bed repair experiments by yellow sand and ceramsite matrixes, research shows that: the oenanthe javanica eco-floating beds had good purifying effects to the eutrophic water in low temperature condition in winter. Ceramsite matrix floating bed got the best TN, TP removal efficiencies, the highest removal rates were 85.1%, 85.0%, respectively. Yellow sand floating bed got the best Chla, TOC removal efficiencies, the highest removal rates were 75.1%, 87.4%, respectively. Matrixes promoted the removal efficiencies of TN, TP and TOC, TN showed the most obvious promoting effect among them, performancing as: ceramsite > yellow sand > no matrix;(2) Through the oenanthe javanica eco-floating bed repair experiments by different densities, research shows that: the oenanthe javanica eco-floating beds had good purifying effects to the eutrophic water in low temperature condition in winter. Density of 6 pots got the best TN removal efficiency, the highest removal rate was 77.0%. Density of 10 pots got the best TP, removal efficiency, the highest removal rate was 92.6%. Density of 2 pots got the best Chla, TOC removal efficiencies, the highest removal rate were 66.7%, 72.8%, respectively. Planting density and TP removal rate of oenanthe javanica eco-floating bed presented a positive correlation, planting density also presented a certain correlation with TOC removal rate;(3) Through the oenanthe javanica eco-floating bed repair experiments by bamboo and zeolite carriers, research shows that: the oenanthe javanica eco-floating beds had good purifying effects to the eutrophic water in low temperature condition in winter. Zeolite carrier floating bed got the best TN removal efficiency, the highest removal rates was 89.8%, bamboo carrier floating bed got the best TP, TOC removal efficiencies, the highest removal rates were 92.2%, 59.1%, respectively. Carriers promoted the removal efficiencies of TN, TP and TOC. TN removal effect was shown as: zeolite > bamboo > no carrier, TOC removal was shown as: bamboo > zeolite > no carrier. Hanging depth of carriers also presented a certain influence on TN, TP, TOC.