In recent years, the severe deterioration of water quality and eutrophication in the Yangtze River has brought much trouble to people’s lives. Because of this, numerous management departments have paid more and more attention to the treatment of the water environment. In order to respond to water environmental protection policy and provide management departments with a basis for refining water quality, this paper takes the Zhuzhou section of Yangtze River-Lushui watershed as its research object. First, we used the Water Quality Analysis Simulation Program (WASP) model as a tool, and obtained the pollution load using the FLUX method formula. During the calibration process, the sensitivity analysis method, the orthogonal design method, and the trial and error method were used. Then, we verified the results by using water quality monitoring data published by Zhuzhou Ecological Environment Bureau. Following that, the water environmental capacity of the Lushui River in normal, wet and dry periods was calculated using the WASP model: the chemical oxygen demand (COD) was 14,072.94 tons/yr, 17,147.7 tons/yr and 10,998.18 tons/yr, respectively; ammonia nitrogen (AN) was 469.098 tons/yr, 571.59 tons/yr and 366.606 tons/yr, respectively; and total phosphorus (TP) was 93.8196 tons/yr, 114.318 tons/yr and 73.3212 tons/yr, respectively. The results show that the WASP model is applicable and reliable and can be used as an effective tool for water quality prediction and management in this area.
The determination of the impacts of marble exploitation on the surface and underground water at SAKALALINA-MADAGASCAR was determined by assessing the physico-chemical properties of the water samples obtained from SAKALALINA and its environs. The concentration of Fe, Mn, Cu, Zn, Pb, Cd, Hg, As and selected major ions in water samples were analyzed in the laboratory to assess their role in the contamination of both surface and ground water. The water in this Study area is mainly used for drinking and industrial purposes followed by agriculture to some extent. The specific objectives are: to describe contamination process in surface water and groundwater due to mining activities; to identify and characterize the critical aspects relating to the water-related impacts of mining in the study area; to propose the best method and the risk management measures for the impacts. The result of water quality parameters were compared with the standards laid down by United State Environmental Protection Agencies (USEPA) standard (2015) and World Health Organization (WHO), suitable for drinking and domestic purpose. The results reveal that levels for certain water quality parameters like EC, pH, alkalinity, nitrate, phosphate exceeded the desirable limits prescribed by the USEOA and WHO standards. The results of physico-chemical analysis of groundwater level in the study area show high pollution level in the region.
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