Study On The Source Water Quality Improvement Result Of The Three-Dimensional Ecological Floating Bed

The ecological floating bed is a brand-new water treatment mode. Through the three-dimensional structure, the food chain relying mainly on aquatic vegetables, aquatic animals and microorganisms is constructed in the ecological floating bed. it gives play to the ecological purification function, at the same time difficult degradable pollutant and "water blooming" are more easily to be eliminated, so the water quality improvement is guaranteed, and which has stronger adaptability in dealing with the water body. The ecological floating bed is mainly used in purifying the lakes and the slowly flowing rivers. Experimental study is carried on about the ecological floating bed craft at the Meiwan bay source water of Taihu Lake in this thesis. The main results of the test are as follows:The preferable operation parameter of the ecological floating bed craft found is that when HRT equal to 1d and exchanges time equal to 7d.The ecological floating bed have better results than other operating mode treatments about TN,NO2--N,TP,CODMn,TOC,Chla,NH4+-N,SS, and it has obvious improvement results to the transparency of water body, it has offered the essential precondition for ecological recovery and improvement of the self-purification ability of water body of sinking hydrophyte.Through carrying on nitrifying potentiality dynamics analysis of the substrate artificial medium in the ecological floating bed, find substrate artificial medium nitrifies approximate to be zero response. the dynamics equation is y =-0.1347x+4.3542, the artificial medium nitrifying potentiality is 3.4×10-5g/h·slice. The materiel balance of Nitrogen and Phosphorus in the static examination shows: In eliminating of the nitrogen, Ipomea aquatica absorbing and the artificial medium nitrify contributing up to 31.8% and 38.7%; in eliminating the phosphorus, the contribution that Ipomea aquatica absorbing is 26.7%. In eliminating of other pollutant indexes, the artificial medium unit always has greater contribution. At the same time B/C rate test indicates: Corbicula fluminea can improve water body's bio-degradable capability effectively.Investigating the ecological floating bed craft eliminat persistent organic pollutants from static and dynamic respectively, the result shows: The ecological floating bed craft has a good elimination to the organic chlorine pesticide, PAHs, DEHP, DBP, PAEs, nitrobenzene, chlorobenzene, atrazine. The PAHs density is far higher than the limit of"environmental quality standard of surface water"which proves that PAHs pollution of the Meiliang bay source water is serious comparatively.Through gas chromatography - mass spectrum's (GC-MS) analysis, find that under the static situation, the ecological floating bed has a good elimination to the trace organic in water. The trace organic apex area elimination rate of the reactor with ecological floating bed is up to 67.6%, instead the comparison reactor raises 4.0%.