| This topic conducts on-the-spot visits and collects data on Shaobo Lake,which has exceeded the standard of water quality,and understands the current status of water quality in the section of Shaobo Lake;from the industrial point source,upstream lake water,tributary into the lake,and lake culture,the section of the Shaobo Lake heart area is analyzed.Reasons for water quality exceeding the standard and existing problems;use the model to calculate the environmental capacity of Shaobo Lake,formulate practical and feasible reduction plans,and conduct target accessibility analysis to lay the foundation for the subsequent lake treatment project.Through the research,the following conclusions were obtained:(1)According to the analysis of the monitoring data of the section of the Shaobo Lake heart area,the primary pollutants of Shaobo Lake are determined to be total phosphorus and COD.In 2016,the Shaobo Lake Control Unit had a COD of 1857.91t,a total phosphorus of 35.27t and a total nitrogen of 384.32t.COD pollution sources mainly come from livestock and poultry breeding,followed by urban life and rural life;total nitrogen pollution sources mainly come from livestock and poultry breeding and urban life;total phosphorus pollution sources mainly come from livestock and poultry breeding and aquaculture.According to the control area analysis,the total nitrogen,total phosphorus and COD into the lake are mostly in Fangxiang Town,accounting for 46%,46%and 50%respectively.(2)The water quality of Gaoyou Lake in the upper reaches of Shaobo Lake was good from 2013 to 2017.However,from December 2017 to March 2018,the water quality of the Gaoxin Lake Lake section was V-type water.The main over-standard factor was total phosphorus,which had a great impact on the water quality of Shaobo Lake.There is aquaculture in the upper reaches of Gaoyou Lake to Shaobo Lake,which has a great impact on its water quality environment.The water quality of the tributaries with direct water exchange relationship with Shaobo Lake is poor.The main pollution factors are total phosphorus,ammonia nitrogen and COD,which also cause the main stream.One of the main reasons for excessive water quality;Shaobo Lake has a large scale of cultivation,total nitrogen emission is 48.4 1t/a,total phosphorus emission is 7.75t/a,and COD emission is 19.01t/a,which is the water quality of Shaobo Lake heart area.important reason.(3)According to the calculation of the most dry month,the total nitrogen content of Shaobo Lake is 299.55t/a,the total phosphorus is 14.98t/a,and the COD is 1658.87t/a.At present,the total amount of pollutants entering the lake is greater than the water environment capacity.The total nitrogen exceeds 36.355 tons/year,the total phosphorus exceeds 10.316 tons/year,and the COD exceeds 226.587 tons/year.(4)According to the size of the control unit,the maximum reduction amount is allocated to each control unit.The pressure reduction is mainly concentrated in Fangxiang Town and Qiong Town.The water quality of the upper reaches of Shaobo Lake is stable and the Huxi area is not met.On the premise of discharging pollution sources to Shaobo Lake,after the Shaobo Lake control unit has strictly reduced emission reductions according to emission reduction measures and reduced the aquaculture area in Shaobo Lake,the water quality of Shaobo Lake can reach the Class III standard of surface water stably. |
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