Study On The Purification Effect Of Plant-type Ecological Floating Island On The Water Quality Of Rural Rivers In Handan City

In recent years,with the continuous development of social economy,water pollution has become a key factor restricting the sustainable development of China's economy,society and the environment.The restoration of water bodies has become the focus of relevant research fields.The experiment adopts the ecological floating island technology,and uses the Canna indica,Thalia dealbata,Eichhornia crassipes,Acorus calamus,Cyperus involucratus,Oenanthe javanica,Phragmites australis,Sagittaria trifolia and Lythrum salicaria as experimental plants to construct a plant-type ecological floating island to deal with the Quzhou County branch of Bengbu City.The river water body of the Wangzhuang section of the Weihe River strengthens the ecological purification function,and aims to provide a valuable reference for the sewage treatment technology of the rural rivers in Handan City.The experiments were carried out to study the purification effect of single plant type and mixed plant type ecological floating island on polluted water.Under static conditions,the changes of COD,TP,NH₄⁺-N and plant growth status in the test water were monitored.The test results are as follows:In the single plant type ecological floating island test,the removal of COD,TP and NH₄⁺-N in rural river sewage Acorus calamus,Oenanthe javanica,Phragmites australis,Eichhornia crassipes,Thalia dealbata,Sagittaria trifolia,Lythrum salicaria,Canna indica and Cyperus involucratus.The rates are 31.5%,24.9%,30.4%,32.3%,24.1%,28.9%,27.2%,29.3%,31.2%;82.8%,83.1%,81.5%,84.3%,81.4%,83.8%,82.7%85.1%,84.6%;35.4%,33.3%,51.0%,43.8%,33.3%,41.7%,28.1%,25.0%,32.3%.9 plant growth conditions are good,the average relative growth rate is above130%,and has a significant improvement effect on polluted water quality.In the mixed plant type ecological floating island test,the removal rates of COD,TP and NH₄⁺-N in the sewage of rural rivers in combination 1,combination 2,combination 3,combination 4 and combination 5 were 26.9%,25.4%and 26.0%,respectively.35.5%,31.2%;60.0%,74.3%,65.7%,82.9%,77.1%;50.4%,53.7%,53.4%,55.2%,52.8%.In the two-stage experiment,the mixed plant-type ecological floating island has better treatment effect than the single-plant ecological floating island,and the best removal effect is the ecological floating island of Oenanthe javanica,Eichhornia crassipes,Sagittaria trifolia and Canna indica?combination 4?,the removal rate of COD,TP and NH₄⁺-N in the water by the floating island reaches35.5%,82.9%,and 55.2%.This combination not only has good removal effect,but also forms a patchy plant structure,which is the best plant purification combination for experimental screening.Finally,the feasibility analysis and economic benefits of the plant-type ecological floating island were analyzed.The experiment proved that the plant-type ecological floating island technology will play a key role in future water treatment applications.