Basement Pollution Investigation And Evaluation And Sediment Nutrient Release Study Of Zaozhadian Lake

As a part of the Baiyangdian area,the Zaozhadian Lake has a relatively important ecological location.The quality of the water environment in this area has a great impact on the development of Baiyangdian Lake and the entire Xiong'an new area.Therefore,it is important to clarify the current pollution status of the basement in the area and its impact on the overlying water.The current situation of the water environment in the Zaozhadian Lake is poor,and the sediments and soils accumulate more pollutants,so the sediment and soil pollution status of the area are investigated and evaluated in this paper.The results show that the moisture content of the sediment in the whole area is stable at a high level;half of the total nitrogen content of the sampling points are abundant,and more than half of the total phosphorus content of the sampling points are at a medium level;Most of the tested heavy metal contents in this area exceed the local background value,and some of the cadmium elements exceed the risk value required by national standards,up to 0.51 mg/kg,which is 6.8 times of the background value of the area.The cadmium and mercury contribute most of the pollution to the sediments and soils in the whole area,which have a large ecological risk;the areas which have heavy comprehensive pollution are mostly distributed in the southwest of the Zaozhadian Lake.Through the columnar static release experiment in the laboratory,the release rule of nutrients under the influence of different environmental factors in the heavily polluted area of the Zaozhadian lake was investigated.The results show that the higher the temperature and the lower the dissolved oxygen,the release of nitrogen and phosphorus of the sediment is more obvious;while pH is different,the release of phosphorus in the sediment exhibits an "inverted U" shape,that is,phosphorus releases more to the upward water when the pH is neutral,and the effect of pH on nitrogen release is the higher the pH,the weaker the release of nitrogen;the change in dissolved oxygen has the greatest effect on the release of nitrogen and phosphorus in water compared to various environmental factors.In summary,this paper aims at the pollution status of algae lake,clarifying the sediment and soil pollution in the area,and identifying the heavy metal elements which have the greatest potential ecological hazard and the area they are,and obtaining the release laws of nitrients under the different environmental factors of the polluted sediments;confirming the significant enviomental factos.All this things can provide certain basis and theoretical support for the removal of sediment and soil?water pollution control and maintenance in the region.