Analysis On The Effect Of Different Ecological Restoration Measures On Water Quality

With the rapid development of China's economy and society,the problem of waterpollution is becoming more and more serious,and the ecosystem is destroyed.In terms of ecological restoration,people only pay attention to the urban river channel and often neglect the rural river channel.Based on the water ecological civilization construction project of Dalian City,this paper studies the pollution remediation technology of the upper reaches of the water source area,and uses the ecological restoration measures such as ecological river channel,constructed wetlands and ecological pool to deal with the water body of the Fuzhou River,and analyzes the purification effect of various measures.So as to provide technical support for the ecological restoration of rural rivers in the northern region.First of all,based on the relevant literature and field investigation,four monitoring sections were set up on the Fuzhou River and Huitou River which are on the upper reaches of Dongfeng Reservoir,and the flow and water quality of the river were monitored to calculate the river pollution flux.Based on this analysis,the main sources of pollution and their characteristics are analyzed,and their self-purification ability is understood.The results show that the quality of the upper reaches of the Fuzhou River is better,but the total nitrogen is serious,the pollution of the Huitou River is serious and the point source pollution is the main factor.In order to compare the water purification effect of different ecological repair measures and the composite system,a compound ecological restoration system composed of ecological river channel,constructed wetlands and ecological pool was designed according to the pollution situation.Then design the ecological engineering form,size,composition,etc.The water quality and flow rate of the experimental site were tracked and monitored,and the water quality of each monitoring point in the experimental site was compared,and the change of the pollutant concentration and the removal rate were analyzed,and the decontamination effect of each ecological restoration measure was studied.The results showed that the removal rates of COD,TN,NH4 +-Nand TP were 54.0%,22.1%,46.1% and 39.2%.The constructed wetlands has the best effect on the removal of organic and total nitrogen,and the ecological pool is best for the removal of total phosphorus.In addition,the design of the parameters of the river ecological restoration measures is very important to the effect of operation.To design the project to meet the purification goal,we need to find the quantitative relationship between the removal effect and the influencing factors.In this paper,the relationship between the removal rate,the removal amount,the concentration of the pollutants and the hydraulic load,the pollution load and the plant species were studied.The results show that the removal efficiency of COD and TP is strong in the design flow range,and the correlation between TN and NH4 +-N removal and hydraulic characteristics is weak.constructed wetlandss and ecological pools are resistant to changes in hydraulic load,and the correlation between the removal rate of pollutants and hydraulic load is weak.The accumulation of nitrogen and phosphorus in the plant growth period is small,but the oxygenation,enrichment and adsorption of the plant greatly promoted the removal process of each pollution index.