Evaluation Of Landscape Water Quality And Improvement Measures In Xinghai Lake Park Of Lianyungang City

As an open area of a city,the urban artificial landscape lake not only has landscape and society function to urban development,but also has many other functions such as humanities,ecology,environmental protection and regulation.However,with the development of modern cities,the pollution to natural environment cause by human activities is also increasing.Due to their own functional reasons,most urban artificial lakes have poor mobility and strong closure and also the surrounding environment is complicated,which all make then polluted to varying degrees.Facing the increasingly serious environmental problems and the contradiction between man and nature,when dealing with urban black and smelly water and landscape water remediation,people generally use a single physical remediation method or chemical remediation method to control the polluted water bodies.Not only a lot of manpower,material and financial resources are consumed,but the symptoms are not cured,and the water body continues to be polluted.Therefore,it is very necessary to explore new treatment methods,especially to improve the artificial lake water body with a large water area.To this end,this article takes the landscape lake of Xinghai Lake Park in Lianyungang City as an example,evaluates the current water quality of the lake through sampling and monitoring,and then based on the current popular ecological restoration method,aiming at the problems that still exist in the ecological restoration of landscape lakes,combined with the pollution characteristics of the lake,studying the technical measures for improving the water quality of the landscape lake,and verifying the implementation effect.The study reached the following main conclusions:(1)Before the implementation of the water body improvement design plan,the water quality of the landscape water body of Xinghai Lake Park was monitored for half a year.After analysis and detection,the average content of COD in the lake water reached 60.3 mg / L,the average content of ammonia nitrogen reached 3.95 mg / L,the average content of total phosphorus reached 0.62 mg / L,and the average content of SS reached 24.2 mg / L.The average content reaches 24 NTU.According to the 2.3.3 Standard for Black and Stinky Water Treatment in the Urban Remediation Work Guide for Black and Stinky Water,Xinghai Lake ’s water quality testing and grading results are judged to be inferior Class V water quality,reaching the “mild black and stinky” standard.Through comparative analysis,the main reasons for the water pollution are: 1.the artificial lake has a lack of fluidity and no injection of flowing water 2.there is a "dead zone" on the edge of the lake 3.the continuous discharge of pollutants from the residential commercial areas around the park.All these eventually leads to the pollution of the water body,serious eutrophication and dereriorated water quality.(2)Through the analysis of the cause of pollution of Xinghai Lake landscape water and the study of domestic and foreign landscape water treatment measures,combined with the operating cost and local actual conditions,the process of Xinghai Lake landscape water treatment is selected as follows: rainwater interception and infiltration in external residential areas,internal Lake water aeration and pushing flow and the establishment of a water ecosystem,and using new ecological floating islands and carbon fiber grass technology for water quality improvement and water ecological restoration,effectively establish a complete set of lake water treatment system.(3)After the implementation of the improvement plan,the water quality monitoring and analysis of the entire improvement process found that the landscape water index COD fell between 22.8-31.5mg / L,ammonia nitrogen fell between 1.05-1.87 mg / L,and total phosphorus fell to 0.11-0.32 mg / L,SS drops to 5-10 mg / L,turbidity drops to 6-12 NTU,dissolved oxygen in water increases to 4.9-7.2g / L,and the removal rate of each index reaches Above 50%,the water quality has been significantly improved,reaching the surface Class V water standard,and is basically close to the Class IV water quality standard,and the water ecosystem has been basically restored.(4)The environmental and social benefits of the landscape water management system of Xinghai Lake Park were evaluated and analyzed.The treatment plan can effectively improve the landscape water quality,improve the lake water ecology and the surrounding environment,and has good social and environmental benefits.In particular,the application of new artificial floating islands and carbon fiber grass not only achieved the effects of water quality improvement and water ecological restoration,but also achieved the effect of beautiful lake views.The floating island area illuminated at night becomes the new highlight of Xinghai Lake Park.After comparative analysis,the economic cost of the process plan is lower,and the effect is more obvious,which has produced very large economic benefits for the entire system.Combining the advantages and disadvantages of each improvement plan,in order to ensure the long-term stable operation of the entire water ecological restoration system of Xinghai Lake,according to the current operation status,the system’s later operation plan and rectification suggestions were formulated.