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Water quality and pollution control of Ying river in China

Congress: 2008
Author(s): Yin CHU, Shouxian XIA, Fang HE
Yin CHU(1), Shouxian XIA(2), Fang HE (1) (1)- School of Resources and Environment, Anhui Agricultural university, Hefei, CHINA, 230036 (2)- Environmental Monitoring Center of Anhui province, Hefei, CHINA, 230022

Keyword(s): water quality, temporal and spatial variation, Ying river, pollution control
AbstractWater pollution is generally very serious in many water bodies in China due to industrialization, urbanization and agriculture development and it has hindered further economic development and reduced available water resources. This study presents the results of the monthly or fortnightly sample measurements of the pollutants over ten years in three observation sites in Anhui province along Ying river, one of the main affluent of Huai river in China. The river water samples have been analyzed and measured for ammonium nitrogen (NH4-N), nitrite and nitrate (NOx), total phosphorus (TP), permanganate index of chemical oxygen demand (CODMn) , pH value and Dissolved Oxygen (DO) etc. Daily water flow data are also available. The results clearly demonstrate that the river has been seriously polluted: the main pollutants are nitrogen (especially in the form of ammonium) and organic compounds (expressed in CODMn). The pollution sources had been a mixture of industry effluent, domestic sewage and non-pointed source agriculture effluent. With the measures applied for pollution control of industry effluent, the contamination level has been abated since 2000. The mean and median levels of NH4-N and CODMn have been reduced respectively from about 20 mg-N/L and 20mg/L for the three sites in the year 1995 and 1996 to about 5 mg-N/L and 6 mg/L in the year of 2004 and 2005. Standard violation existed at all flow regimes. The variation of three sites is limited according to existing monitoring protocol. This is attributable to the dams along the river, which have been built for flood control and irrigation and which block also the pollutants. The retention of pollution can be flown out during floods, which has usually not been sampled. The water environment deterioration has not only led to the unavailability of the river as water sources and also to the contamination of ground water, which is the main source of water use. Integrated water resources management and water pollution control measures are discussed by taking the whole watershed into consideration so that the water quality can be improved.
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