"Three Rivers and Three Lakes" refers to the Huaihe River, Haihe River, Liaohe River, Taihu Lake, Chaohu Lake and Dianchi Lake that flow through densely populated areas in China. The water pollution control of these key river basins is related to the social and economic development of nearly half of the provinces and cities in China and the quality of life of the people, and is the top priority of water pollution prevention and control in China.

We will continue to promote pollution prevention and control in key areas of environmental protection identified during the Ninth Five-Year Plan period, such as three rivers (Huaihe River, Haihe River and Liaohe River), three lakes (Taihu Lake, Chaohu Lake and Dianchi Lake), two districts (acid rain control area and sulfur dioxide control area), one city (Beijing) and one sea (Bohai Sea), and achieve results during the Tenth Five-Year Plan period. Pay close attention to water pollution control in the Three Gorges reservoir area and along the South-to-North Water Transfer Project, and start comprehensive water pollution control in the upper reaches of the Yangtze River, the middle reaches of the Yellow River and the Songhua River Basin.

In 2005, the inflow of chemical oxygen demand was controlled at 466,000 tons/year, the discharge was controlled at 643,000 tons/year, the inflow of ammonia nitrogen was controlled at 92,000 tons/year, and the discharge was controlled at 654.38+065.438+03,000 tons/year. With the continuous interruption of the main stream and tributaries of the Huaihe River, the water quality of the main stream of the Huaihe River has been further improved.

brief introduction

In the East Route Project of South-to-North Water Transfer in 2005, the inflow of chemical oxygen demand was controlled at 65.438+10,000 tons/year, the discharge was controlled at 547,000 tons/year, the inflow of ammonia nitrogen was controlled at 9,000 tons/year, and the discharge was controlled at 70,000 tons/year. The water quality of 39 control sections of the main water conveyance line reaches Class III standard, and that of 6 control sections reaches Class IV standard.

Formulate and implement water pollution prevention and control plans for the Yangtze River, Yellow River and Songhua River basins, comprehensively control soil erosion and water pollution, rationally allocate water resources, and strive to improve the water quality of the upper reaches of the Yangtze River, the middle reaches of the Yellow River and the Songhua River basins in 2005.