| As the main river in Dalian,Fuzhou river provides an important source of water and living environment for the residents in the river basin,but the water quality of the river is polluted because of the waste water,which affects the water safety in this area.Dalian,as an advanced city in water management,has actively tried and explored river governance,using a variety of ecological treatment technologies including the constructed wetland to purify the water.By conducting water purification project in Dalian,this article finds a way to explore a Ecological river treatment technologies suitable for application in Dalian.In order to study the influence constructed wetland technology on the water purification in the north area,based on the experimental project of the Fuzhou River constructed wetland in the upper reaches of Dongfeng Reservoir in Dalian,the site has been monitored for 3 years,and the following works have been completed.First of all,this paper analyzes the effect of removal rate in 2017 through monitoring the Fuzhou River constructed wetland.Secondly,through the summary and comparison of three years’ removal effect of constructed wetland,the interannual change of wetland removal effect is analyzed.Finally,this paper focuses on the effect of constructed wetland operation,the relationship between the removal volume and the wetland area was simulated.In addition,the impact of pH,temperature,DO and other factors affect the efficiency of constructed wetlands were summarized.The results show that with the increase of operation time,the removal of pollution has been steadily increased.In 2017,the annual average removal rate of BOD5 from 2015 and 2016 increased by 39.47% and 5.8% respectively.In 2017,the annual average removal rate of total nitrogen increased by 17.9% and 24.5% compared with 2015 and 2016 respectively.The annual average removal rate of ammonia nitrogen in 2017 was higher than that of 2015.In 2016,they increased by 15.3% and 11.2% respectively.The constructed wetland after three years of operation can effectively remove nitrogen pollutants.The pH,temperature,DO and other factors of the inlet wastewater have a weak influence on the removal effect,while the conductivity and the concentration of the pollutants at the inlet water quality have a great influence on the removal effect.This article focuses on the relationship between the TN and CODCr load removal and the wetland area,which has a large impact on the operation performance of constructed wetlands.The fitting curves and fitting equations are derived and used to calculate the required scale of the actual project.It provides theoretical and data support for the application of ecological river rehabilitation measures in Dalian. |
