Water Environment Improvement of Zhongdong River by Water Diversion and Distribution in Hangzhou

摘要

As the development of city economy,Zhongdong River in Hangzhou was seriously polluted,with the worst water quality.In order to obtain the effect of water diversion and distribution from Qiantang River on the water quality of Zhongdong River,7-year continuous monitoring was conducted,which was at the fixed stations before and after the water diversion and distribution.After the water diversion project,the dissolved oxygen concentration of the river water was one to two times higher than before,and the ammonia nitrogen and total phosphorus decreased by 60%and 65%,respectively.When increased the amount of water diversion,the dissolved oxygen concentration of the river water elevated by 13%,and the ammonia nitrogen,total phosphorus and potassium permanganate index decreased by 8%,3%and 14%,respectively.The reason for the river water pollution was contributed to the combined sewer system and riverway sludge,especially during the rainfall,the dissolved oxygen concentration of Zhongdong River sharply declined by 95%,while the ammonia nitrogen and total phosphorus increased by 90%and 87%,respectively.The research results could provide theoretic basis for sustainable improvement of Zhongdong River water quality and river management department making the related regulations and policies.