Construction And Study Of Ecological Floating Island For Water Purification Of Shahe Reservoir

Due to the large amount of point source and non-point source pollutants discharged the Beijing Shahe Reservoir,the water in the reservoir is moderately eutrophic,the nitrogen and phosphorus are seriously exceeded.The water in the reservoir is inferior V water quality,and the reservoir has poor self-purification ability.In this paper,use ecological floating island technology to study the removal efficiency of C,N.P pollutants,and determine the optilal parameters of the system.This paper studies the temporal variation and morphological characteristics of major pollutants in the Shahe Reservoir.The results show that the COD concentration in the reservoir area is stable from May 2018 to November 2018,the monthly average concentration is naintained at 40 mg/L,the monthly average concentration of NH4+-N was below3.00 mg/L,and the average concentration of NO3--N is at the upward trend,the monthly average concentration of TP is in a downward trend.The pollutants in the rescervoir area mainly exist in the form of dissolved state,in which nitrogen is mainly NO3--N.This paper studies the effect of ecological floating island filling on the purification of eutrophic water.The results show that among the three matrix ratios(zeolite:ceramsite 1:1,1:2,2:1),zeolite:bioceramics 2:1 has thc best removal effect,COD,NH4+-N,NO3+-N The TP removal rates were 29.66%,20.36%,14.99%,and 21.04%.The combined suspension fillers of the three suspension fillers has the best removal efficiency.The removal rates of COD,NH4+-N,NO3--N and TP are 25.46%.36.65%,23.69%and 20.73%.The combined suspension suspension at 234.85 m2/m3 suspension density has the best removal efficiency.The removal rates of COD,NH4+-N,NO3+-N and TP are 28.94%?42.97%?26.90%and 27,27%.In addition,the amount of biofilm supported by the composite filler is 275.07 nmolP/g(DW),Among the microbial systems of the combined fillers.Pseudomonas.Exiguobacterium,Mycobacterium,Rhodobacter,and Bdellovibrio were dominant,accounting for 54.2%of the microbial system.This paper studies the effects of two ecological floating islands on the purification of eutroplic water.The results show that the traditional ecological floating island has better effect on the removal of medium and low concentration water,and the purification effect on high concentration water is poor.The new ecological floating island has improved the water purification effect of the three kinds of water compared with the traditional ecological floating island..The new ecological floating island carried out water purification experiments on the raw water of Shahe Reservoir.The results showe that the COD removal rate 1s 38.91%,and the removal rates of NH4+-N,NO3--N,DON(organic nitrogen)and TN are 80.80%and 63.99%,66.67%,67.84%,DIP(soluble total phosphorus),DOP(organic phosphorus),TP removal rate are 75.49%,85.71%,79.82%,and the water reached the surface class ? standard(GB3838-2002).