Water Environment Status of the 12 Largest Lakes of Jiangsu Province and Corresponding Suggestions on the Pollution Control Measures

There are 12 lakes with each area larger than 50 km2 in Jiangsu Province.In the last years,due to serious pollution of total nitrogen and total phosphorus,and reclaiming land from lakes,the water quality of the 12 lakes has descent continuously,the lakes areas has declined,degree of eutrophication has been worsening,and the eco-system of the lakes has deteriorated seriously.The fundamental causes of the environmental problems of these lakes were rapid economic growth,too large proportion of secondary industry in economic structure,the quantity of pollutants in excess of capacity,the nitrogen and phosphorus released from sludge at the bottom of lakes,and pollutants carried by rivers poured into these lakes.Suggestions were given such as the structure of industry adjustment,execution of restrictive emission standards,the treatment emphasis on the key areas,key businesses,key enterprises and key pollution sources shifted from COD controlling to COD and nitrogen phosphor controlling,water transfer to improve the water quality,setting up the data base of lake resources and the information network of ecosystem.Also analysis of source of lake pollutants,research on mechanism of eutrophication and cross-boundary comprehensive management should be carried out.