Investigation of water pollution in Baiyangdian Lake, China

To delineate the water quality of Baiyangdian Lake, North China, a ten-year analysis (2000-2009) of the variations on water quality parameters were conducted in the lake. The results showed that the variation of pollution indexes for TP, TN and NH4+ took a larger fluctuation and two “pollution peaks” appeared in 2000 and 2006 in the comprehensive pollution index curve. A simple model was subsequently used to analyze the response of Baiyangdian Lake when the nutrients loading rates were changed. This model described the variations of lake parameters related with nutrients concentrations. It also suggested that maximum tolerance discharges of total phosphorus and nitrogen to Baiyangdian Lake is 10 tons/year and 437.5 tons/year, respectively.