Research On The Evironment Protection Of Chang Tan Reservior Area

Reservior is the largest water conservancy project in Tanzhou history,and is the most important waterhead field in Tanzhou.However,the water quality of ChangTan Reservior is unable to satisfy the standard for ground water environmental quality in functional district. The water environment quality of ChangTan Reservior was checked,the main pollutant sources (industrial pollution source,domestic pollution source and agricultural pollution source) were investigated and the pollution potential of main pollutant sources was evaluated with the equal-standard drainage capacity.The results showed that among the pollution sources,agricultural pollution source took the first place with pollution index of 51.5%,domestic pollution took the second place with pollution index of 48.1%,and tourist pollution source took the last place with pollution index of 0.4%.Among the agricultural pollution sources, the pollution of chemical fertilizer was the most serious with the pollution index of 71.9%.Because of the comparative lag of industrial economy,the industrial pollution source which attracted a lot of attention in the developed district has become subsidiary in this district. On the contrary, agricultural pollution source and domestic pollution source which were neglected in the developed district has come to the leading place. Among the pollutants, the pollution indexes of CODcr,TN and TP were 6.0%,58.9%,and 35.1%,respectively. TN and TP have become the main pollutants to changtan Reservior.The domestic pollution source was taken as an example,the sewage drainage from changtan reservior district in 2007 was predicted. The results indicated that the amount of sewage drainage will be larger than that in 2001. So effective measure must be taken to control the increasing pollution.Because agricultural pollution and domestic pollution are the main pollution sources to changtan Reservior,they must be controlled efficiently. Combined with the ecological construction,more sewage collection systems and sewage treatment plants shoule be constructed in changtan Reservior district. Chemical fertilizers and pesticides should be applied more scientifically to avoid their pollution. The management and waste treatment of animal husbandry shoule be strengthened . After all the measures take effect, two millions people around changtan Reservior can surely drink clean water.