Study On Optimal Configuration Of Aquatic Plants In Jiaogang Lake Based On Water Quality Purification And Environmental Landscape

Water pollution is becaming an ecological problem that restricts the sustainable development of human and environment.In addition to conventional remediation technologies such as physical and chemical methods,aquatic phytoremediation technology is widely used for the remediation of various polluted water bodies due to its high efficiency and environmental protection.This paper takes the Jiaogang Lake Wetland Park in Huainan City as the research object.The pollution status of each water body in the Jiaogang Lake Wetland Park and the arrangement of aquatic plants in each area are grasped by sampling and analysis of the water bodies in the Jiaogang Lake area.Six aquatic plants Alisma plantago-aquatica,Lythrum salicaria,Acorus tatarinowii,Ceratophyllum demersum,Nymphaea alba var.rubra and Sagittaria sagittifolia were quantitatively tested for the removal effects of various pollutants in sewage,and the comprehensive experiment results were used to evaluate the ornamental effects and purification effects of the plants with the Analytic Hierarchy Process（AHP）comprehensively.Finally,several optimal configurations of aquatic plants in Jiaogang Lake Wetland Park were proposed based on the above survey results and research conclusions.The conclusions are as follows:（1）There are some differences in temporal and spatial distribution of water quality parameters in Jiaogang Lake.Among them,the temporal variation of TP concentration is July>May>November>September,showing the spatial trend of"low East and high west";the temporal variation of TN concentration is November>July>May>September,showing the spatial trend of"low East and high west";and the temporal variation of NH₃-N concentration is July>May>September and November,the spatial distribution is more uniform in September and November,but the spatial trend of May and July are"low in the East and high in the west";the temporal variation of TN concentration is November>July>May>September,showing the spatial trend of“East high and low west”.The evaluation results of eutrophication in Jiaogang Lake showed moderate eutrophication except for lotus pond area.（2）Lythrum salicaria and Alisma plantago-aquatica had better effect on the removal of TN at three concentrations with the removal rate of more than 80%;the removal efficiencies of Lythrum salicaria for TP at three concentrations are 78.24%,94.44%and 61.54%;the removal rate of NH₃-N in high and medium concentrations is better than that of Ceratophyllum demersum,Sagittaria sagittifolia and Acorus tatarinowii,more than 80%,obviously higher than the other three aquatic plants.Ceratophyllum demersum and Sagittaria sagittifolia had better removal effect on NH₃-N in low concentrations with the rate of more than 80%;for the concentration of COD,all of them had better removal efficiencies but there is no major difference.（3）The purification and ornamental effects of aquatic plants were evaluated with AHP,the scores of the six aquatic plants were as follows:Acorus tatarinowii（7.70）>Lythrum salicaria（7.38）>Alisma plantago-aquatica（6.46）>Sagittaria sagittifolia（5.55）>Nymphaea alba var.rubra（5.53）>Ceratophyllum demersum（4.06）.The six aquatic plants all scored above 4 points,indicating that they have a relatively good effects in water purification and ornamental effects.（4）According to the different pollution status of each area in Jiaogang Lake Wetland Park,combined with the comprehensive value score of aquatic plants,aiming at the existing problems of aquatic plants allocation in different areas of Jiaogang Lake Wetland Park,several optimal configurations of aquatic plants were proposed and 9aquatic plants optimized for configurations.Figure[30]table[31]reference[104]...