Research On The Characteristics Of Water Pollution’s Temporal And Spatial Changes And Pollution Reduction Technology In Baiyangdian Watershed

After the establishment of the Xiong’an New District,governments at all levels have implemented a series of comprehensive pollution control to measures in the Baiyangdian River Basin.In order to evaluate the current pollution situation of Baiyangdian,the effect of the ecological environment improvement project of Xiong’an New Area on the improvement of Baiyangdian water environment was analyzed.This study combined the field sampling survey and sample analysis data to analyze the spatial and temporal changes of the nutritional status of Baiyangdian waterbody and sediment pollution,and based on the above research conclusions,analysis and discussion were made on the reduction of domestic sewage pollution in the village located in Baiyangdian and the reduction of sediment pollution in the lake.The main causes of changes in the water environment were studied and analyzed to explain the spatial and temporal distribution characteristics of the nutritional degree of Baiyangdian waterbody.The results show that the waterbody of Baiyangdian Lake is in a state of eutrophication.Through historical comparison,it has been found that while the ecological environment in Baiyangdian is improving,the pollution problem of the sewage discharge in the village of Baiyangdian is still serious.Part of the focus of the management of Baiyangdian should be on pollution control in villages within Baiyangdian.The study designed a "biological-ecological" integrated treatment device suitable for domestic sewage in Baiyangdian village and optimized the operating conditions of the device.At the same time,the construction of sewage treatment facilities in Baiyangdian village was analyzed and discussed.The results show that the device can adapt to the topographic characteristics of the village in Baiyangdian and the characteristics of domestic sewage discharge;the water quality of the effluent of the device can reach the level A discharge standard under the optimal working conditions;the layout of the sewage treatment facility in Baiyangdian village can comprehensively consider the village layout,the topography of the village and Population size.The study evaluated the characteristics of the pollution degree of nutrients and heavy metals and ecological risk of Baiyangdian sediment and analyzed and discussed the pollution restoration technology of Baiyangdian sediment and the choice of sediment priority treatment area.The results show that the nutrient pollution in Baiyangdian sediment is serious;the heavy metals pollution is at a clean and light pollution level;the heavy metals pollution in Baiyangdian sediment is at a moderate ecological risk level,and there are some points at the level of severe and serious ecological risk Bit.Compared with 2010,the ecological risk index of heavy metals pollution in Baiyangdian sediment has decreased in different degrees in 2019,and the improvement effect in the southern area of Baiyangdian is relatively poor;the next step of sediment pollution control in Baiyangdian can use ecological cleaning in areas with serious pollution and sedimentation.Silt technology,biological treatment technology is preferred in areas with weaker pollution.The treatment area can be selected according to the ecological risk level of heavy metals in the sediment and the population density of the residents in the area.