Study on Present Situation of"Differentiated Control Measures for Specific Pollutants"and Control Measures for State-controlled Shaduan Section
In order to put forward measures for control of water environment in a scientific way,the water quality of state-controlled Shaduan Section and other sections in the basin from 2015 to 2020 was analyzed.With towns as control units,the proportion of three pollutants which included chemical oxygen demand,ammonia nitrogen and total phosphorus in each unit were calculated,and the current situation of water ecological environment in the basin of the Shaduan Section was understood.The results showed that the water quality of state-controlled Shaduan Section was unstable and reached the Class Ⅱ assessment target during the 13 th Five-year Plan period,and the main over-standard component was total phosphorus.The water quality of upstream Baibu intersection had a great impact on the Shaduan Section.Total phosphorus from agricultural non-point sources contributed the most to the amount of pollutants entering the river,with Pingqiao Town and Baihe Town ranking top two among the control units,which accounted for 8.87％and 7.13％,respectively.Domestic sources contributed the second most to total phosphorus,and Chicheng Town took the first place in this regard,accounting for 7.08％.The research results provide important reference for stabilizing the water quality of the Shaduan Section,improving the ecological environment of rivers and proposing targeted control strategies.
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