CHARACTERISTICS OF ORGANIC POLLUTANTS(COD)AND THEIR SOURCE IN DIANCHI LAKE
Organic pollution is still prevalent in Dianchi Lake.A comprehensive understanding of the characteristics and sources of chemical oxygen demand(COD)would contribute to the precise management and pollution prevention.The present work employed three-dimensional fluorescence spectroscopy to analyze the organic matter characteristics in Dianchi Lake and utilized mass balance calculations to assess the annual input and output of organic pollution in 2020.The results revealed that the COD concentrations were relatively higher in the eastern and western regions of Waihai,and the organic matter of the lake exhibited autogenous characteristics.The total input of COD throughout the year was estimated to be approximately 43648 tons.Urban non-point source pollution and carbon fixation by microalgae were the main inputs and accounted for 34.6％and 31.4％of the total input volume,respectively.Furthermore,18.9％of the total input accumulated within the lake.To mitigate organic pollution in Dianchi Lake,measures such as strengthening urban runoff control,microalgal harvesting,and sediment dredging were necessary.These findings provided theoretical support for the management of organic pollution in Dianchi Lake.
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