Effect of Floating Bed with Different Configurations on Taihu Lake Water Purification under Low Temperature
The removal rules of nitrogen and phosphorus pollutants in Taihu Lake water under low temperature by different biological configurations of aquatic plant floating bed,aquatic animal floating bed,aquatic plant media floating bed,aquatic animal media floating bed and combined ecological floating bed were studied.The results indicated that the combined ecological floating bed had the best comprehensive removal effect on various pollutants.The plants had better removal effect on dissolved nitrogen at low temperature.The strong microbial enrichment of the artificial medium made it still show certain nitrification and denitrification under low temperature.Hyriopsis cumingii promotes the solubility and inorganic of particulate organic nitrogen through filtration,which was beneficial to the utilization of plants and microorganisms,and improved the removal effect of TN in integrated ecological floating bed(IEFB).The absorption of plant unit and nitrification and denitrification of artificial medium unit at low temperature were the main reasons for nitrogen removal in IEFB.The study of TP showed that the main reasons for phosphorus removal in IEFB at low temperature were the filtration of Hyriopsis cumingii,the adsorption and interception of artificial media and the assimilation of microorganisms.The removal of trace organic substances by IEFB was investigated.The total peak area of trace organic matters in in IEFB decreased by 73.87％in 6 days,1.47 times that of the blank control floating bed.The 6-day peak area removal rates of tricyclic[5.2.1.0(2,6)]dec-3-en-10-ketone,diethyl phthalate,butyl phthalate 2-ethylhexyl phthalate,and clofenphos reached 46.06％,36.45％,89.87％,and 48.25％,2.97 times,2.51 times,1.64 times,and 6.37 times of the blank control floating bed removal rate.
万方数据
维普
