Study On Purification Efficiency And Mechanism Of Microporous Aeration-Floating Treatment Wetland Technology

In order to solve the unsatisfactory treatment effect of traditional ecological floating island technology on micro-polluted water bodies,the traditional aeration method will make the volume of air bubbles in the water body large,the stirring will be too severe,and it will not be easy for the stability of the rhizosphere of aquatic plants and the hanging film of biological fillers.Causing problems such as unsatisfactory pollutant removal.The microporous aeration technology was introduced into the field of FTW?floating treatment wetland?.The improvement and improvement of the ecological floating island technology by the microporous aeration method were explored.The pollutant removal effect under different aeration conditions,the effect of the film on microbial fillers,and aquatic life were studied.The growth effect of plants,and the number of species and microbial activity in water bodies.The following main results were obtained through this experiment:The microporous aeration-ecological floating island combined technology can achieve a high removal efficiency of NH₄⁺-N,TP,NO₃^--N in a short time,and a large number of nitrifying bacteria and Polyphosphate bacteria,the advantages of stable biofilm hanging film,strong modularity and combination,easy to field construction,can be promoted and applied.At the same time,a high amount of aeration has a significant effect on the oxidative removal of NH₄⁺,which can oxidize a large amount of ammonia nitrogen into nitrate nitrogen in a short period of time.The removal rate was 67.78%.For the removal of other pollutants,the effect of high and low aeration is not obvious.According to the analysis of the various factors of the response surface method,the order of the influence of the three factors on the dissolved oxygen in the three factors of water temperature A,aeration time B,and aeration amount C is A>C>B.The plants that have a large impact on the aeration conditions are Acorus calamus,Canna,Humulus,and Lythrum.In addition,the stems and leaves grow well under low-aeration conditions,and the plants that have no significant effect on the change of aeration are windmill,trilobum,and rush grass.The order of the adaptability of three different biological fillers during the adaptation period is as follows:soft fillers>combined fillers>hard fillers;the order of adaptability of the logarithmic growth period is:combined fillers>soft fillers>hard Quality packing;the order of anti-stripping ability in the stable period is:hard packing>soft packing>combined packing.At the same time,the combination of microporous aeration and ecological floating island technology can effectively increase the number of proteobacteria,Bacteroides and acidobacteria groups to become the dominant species for nitrogen and phosphorus removal,thereby inhibiting the growth of harmful bacteria such as cyanobacteria and preventing The emergence of blooms.Through this experiment,we can draw the following conclusions:In the actual operation of the combined technology,the amount of aeration should be adjusted according to the actual environment and engineering requirements.Excessive aeration has no obvious effect on the removal of pollutants.It will cause the respiration of aquatic plants to be too strong to inhibit photosynthesis and affect growth;in the selection of biological fillers,you can change the aeration amount or combine different biological fillers to obtain the ideal number of hanging films;at the same time,you should regularly check whether there is a nutritional level The lack of or the food chain breaks to regulate the stability of the entire microporous aeration-ecological floating island system.Contents of the abstract.Times New Roman.