Study On The Pollution Characteristics Of Jiao Gang Lake And Its Inflow Water

In recent years,Jiao gang Lake has vigorously developed tourism and fishery aquaculture,resulting in a decline in water quality of the lake and.a continuous decrease in the area of wetlands in the region.In this paper,we study the pollution characteristics of Lake Jiao gang and its water intake into the lake to understand the pollution status of Lake Jiao gang and its water intake into the lake,and analyze the spatial correlation of the lake water and its surrounding sampling areas to understand the surrounding ditches in the lake.The impact of body pollution provides the data foundation for its ecosystem restoration and protection.In this study,sampling and analysis were conducted during the flood season and dry season in 2016 from the focus lake water inlet to the lake to understand its heavy metal,nitrogen and phosphorus,ions,chlorophyll a,chemical oxygen demand and various carbon content pollution characteristics.Current status of pollution in lakes;through pre-and post-rainfall collection,analysis,and monitoring of water samples from tributaries of lakes in Jiaozuo Lake during the period of flat water in 2017,the water quality of lakes surrounding lakes in Jiao gang Lake was investigated.influences.Through the study,the following conclusions are drawn:1.Jiao gang Lake has relatively low weight metal content in lakes,and most of the point water body weight metal contents meet the Class ? water standard specified in the "Surface Water Environment Quality Standard"(GB3838-2002),only a few of the points are in Class ?.Level;iron,manganese content in the flood season are higher than the limits specified in surface water environmental standards 0.3mg/L and O.lmg/L,iron content in the dry season also exceeded the standard.The ion pollution of Jiao gang Lake into the lake is relatively small,and the ion content does not fluctuate.It is relatively stable in the water body.The fluoride ion,chloride ion and sulfate ion concentration are all within the limit value of the Environmental Quality Standard for Surface Water(GB 3838-2002).The concentration of nitrate ion and sulfate ion in the dry season is much higher than that in the wet season.2.The nitrogen and phosphorus content in the flood season is basically higher than the dry season.The total nitrogen content of all sampling sites during the wet season exceeded the national ? water standards,and most of them were between Class ? and ?;the water quality of each sampling site during the dry season was slightly better than that of the wet season,except for a few points,basically Class ?level.The total phosphorus content of all sampling sites during the wet season is much higher than the national ? water standard.In the dry season,except for a small number of sites that meet the national ? water standard,all the other sites are Class? or ? water.3.The chlorophyll content in dry season was significantly lower than that in wet season,and it was basically maintained at 0.025 mg/L.Only a few spots were slightly higher,but the chlorophyll content was higher in the wet season,between 0.049 and 0.219 mg/L;The chemical oxygen demand exceeds 20 mg/L,and the water quality is basically maintained in categories ? and ?;the total carbon and total inorganic carbon have similar spatial distribution,and the inorganic carbon accounts for more than 85%of the total carbon content.4.The main influencing factors of the lake are nitrogen and phosphorus nutrients salt.In the flood season,Jiaozuo Lake's water samples collected at all sampling points were higher in the wet period than in the dry season.During the flood season,Lake Jiao gang's lake entrance area is basically at a moderately eutrophic level,while during dry season,Jiao gang Lake's lake entrance area is basically at a light eutrophication level.In the area near the center of the lake during the wet period,the degree of eutrophication is lower than that near the entrance to the estuary,but it is the opposite in the dry season.5.The nitrogen content in the water of Jiao gang Lake is generally maintained at the level of Class ?.There are three main tributaries of the source,one is the south central ditch in the southwest direction of the lake,and the other is the Dingjiagou and Guangou tributaries in the northeast of the lake.Through the Moran index spatial autocorrelation analysis,we can basically determine that the water in the ditch around Jiao gang Lake has a significant impact on the nitrogen pollution of the lake,especially after rainfall,this effect is strengthened.6.The total phosphorus content in Jiao gang Lake is relatively high,and the total phosphorus basically reaches the Class ? water standard.The pollution mainly comes from the lake itself.Apart from Dingjiagou and Guangou,other tributaries do not contribute much.Similar to nitrogen content,the Moran index spatial autocorrelation analysis can basically confirm that the water in the ditch around Jiao gang Lake has a certain aggravating effect on the nitrogen pollution of the lake,especially after rainfall.7.The pollutants in the water of Jiao gang Lake mainly come from aquaculture pollution,residents' living pollution,livestock and poultry breeding pollution,and agricultural non-point source pollution.The pollution of industrial waste water is relatively small;the surrounding ditches have a great impact on the pollution of Jiaogang Lake and are underway.In the ecological protection of Jiao gang Lake,special attention should be paid to the control of external pollution into the lake and control of pollution from the source.The main problem that currently arises in lake water is mild eutrophication,and it is necessary to adopt certain water recovery and prevention measures.