Assessment on Water Environment Status of Surface Water in Typical Country River——Tiaozi River

The monitor and evaluate on Tiaozi River,one of the most polluted tributaries in Liaohe River Basin,were conducted by using the history monitor data and situation sampling.The results showed that the COD of Tiaozi River was 250 mg·L-1,NH3-N was 35.9 mg·L-1,before the Siping municipal wastewater treatment plant was build and the river was polluted seriously.After the Siping municipal wastewater treatment plant came into working,the water quality was improved obviously.COD of the surface water in Tiaozi River in high flow period didn't exceed the class V standard of Surface Water Environment Quality Standard(GB3838-2002).COD of the surface water in Tiaozi River in low water season exceeded the class V standard of Surface Water Environment Quality Standard(GB3838-2002).NH3-N of the surface water in Tiaozi River exceeded the class V standard of Surface Water Environment Quality Standard(GB3838-2002) in all the months.The results also indicated that building the water disposal project,improving the discharge standard of pollutants,was the effective way to deal with the water pollution in Tiaozi River.