Research On Remove Effect And Microbial Mechanisms Of N And P In Landscape Waterbody By Solar Energy-enhanced Ecological Floating Beds

This research was based on the requirements of the Twelfth Five-Year Plan for water pollution control.Solar energy-Enhanced ecological floating beds were implemented to reduce nutrient quantity of a eutrophic lake.The solar energy aeration device was applied to floating bed to save electric energy and reduce the operation cost.Three phosphate accumulating organisms were isolated and fixed for phosphorus removal.The removal of N and P in the mixed wastewater was studied by using molecular biology technology and bioinformatics technology.The main conclusions are as follows.?1?The operation condition of ecological floating beds was optimized under the condition of static test.The results showed that average removal efficiencies of COD_Cr and total nitrogen for Canna was better than that for calamus and lythrum.The dissolved oxygen value,average removal efficiencies of ammonia nitrogen and total phosphorus for aeration at 20cm were higher than other aeration position.?2?Three sets of devices about solar energy aeration were set up:Solar energy-bionic aquatic weed device,solar continuous aeration device,solar intermittent aeration device.Solar energy-bionic aquatic weed device combines solar energy aeration and biological contact oxidation technology.The results showed that the removal efficiency of nitrogen and phosphorus for solar bionic aquatic weed were higher than other devices.?3?Three phosphate accumulating organisms were isolated from water plant,identified as Streptococcus and Staphylococc.The physiological and biochemical characteristics of three strains were studied.Three phosphate accumulating organisms were fixed With sodium alginate,polyvinyl alcohol and activated carbon.After adding the immobilized phosphorus,the average removal efficiency of total phosphorus was0.37mg/L,reaching the standard of national groundwater environmental quality.?4?Removal efficiency and microbial diversity of three kinds of solar energy floating beds were studied.10 samples were carried out by microbial diversity analysis.The results showed that the dominant species were Betaproteobacteria?Bacteroidetes?Sphingomonadaceae and Hydrogenophaga,et al.The species associated with the removal of N and P were Hydrogenophaga?Limnohahitans?Rhodobacter?Bacillus,et al.