Impact of Riverine Pollutants on the Water Quality of Lake Chaohu, China

[摘要] The water environmental capacities for CODMn, TP, and NH3-N in Lake Chao were estimated with a zero-dimensional model using Class III water quality as the target. The effects of river pollutants transported by the eight major tributaries on the lake's water quality were then analyzed. The results showed that the water environmental capacities for CODMn, TP, and NH3-N in Lake Chao for 2002-2008 were 6.21-6.74, 0.05-0.06, and 1.01-1.27 × 104 ton/yr, respectively. The safety margins for CODMn, TP, and NH3-N, based on the lake's background reserves, were 5.17-5.86, 0.01-0.03, and 0.89-1.12 × 104 ton/yr, respectively. Annually, the river pollutants transported by the tributaries to the lake amounted to 3.58-4.49 × 104 ton of CODMn, 0.19-0.27 × 104 ton of TP, and 4.09-5.47 × 104 ton of NH3-N. The total amount of CODMn exported by the tributaries was less than the water environmental capacity (accounting for 56-68%) and below the safety margin (accounting for 70-82%) of the lake. However, the total amounts of TP and NH3-N were 3.78-14.75 times higher than the water environmental capacity and the safety margin of the lake. To prevent further deterioration of the lake's water quality, it is critical to strengthen pollution control in the rivers around the lake and to reduce the sources of river pollution.

[发布机构] Resources and Environmental Science College, Agricultural University of Hebei, Baoding; 071000, China^1;River and Estuary Coastal Zone Environmental Innovation Base, Chinese Research Academy of Environmental Sciences, Beijing; 100012, China^2

[效力级别] 材料科学

[关键词] Lake Chaohu;Safety margin;Water environmental capacities;Zero-dimensional models