The Water Pollutants And Total Amount Control In Deyang City

With the sustainable development of society and economy, environmental problem had been prominent continuously, and water environment was an important component of which, the pollution problem was the most serious. The water pollutants and its total amount control had become an important research field in keeping the balance of environment and sustainable development of the society. Aiming at the limitation of the existed researches,both at home and abroad, this paper,combining with the characteristics of the water environment and pollution status in Deyang city, a new method was proposed for water quality evaluation,pollution source analysis,water environment capacity calculation,total amount control and distribution of the water pollution. As a result,a theoretical ,practicable method system for water pollutants and its total amount control was established.Firstly, based on the characteristics of water environment,the fuzzy mathematical evaluation method was introduced to the water quality evaluation ,and the results showed: 5 rivers, with a total of 20 monitoring sections to meet theâ… ,â…¡,â…¢,â…£,â…¤, inferiorâ…¤water quality standard , the section rate was 10%, 5%, 50%, 5%, 20%, 10% separately;The equal-standard waste load method was used to evaluate the main sources of pollution,also the major pollutants BOD5 and COD were made clear,with the equal-standard waste load ratio was 40.65% and 29.33% respectively.Secondly, the water environmental capacity was analysed. The measurement results showed that: COD water environmental capacity of the main rivers was 11,781 tons / year in Deyang city ,and NH3-N water environmental capacity was 791.1 tons / year; In Jingyang area, Shifang city and Zhongjiang county ,the water environmental capacity was relativelty small, however,in Mianzhu city and Luojiang county,the water environmental capacity was relatively large.Thirdly,combined with the equity and efficiency principle, a new conception of environmental Gini coefficient was introduced to total amount control and allocation for the water pollutants. Aiming at the near and long-term total amount control, the total evaluation index of regional and industry allocation were determined respectively.In the regional total amount allocation, when the COD was the water pollution, the size of fairness was in sequence of: GDP-COD environmental Gini coefficient (0.1509)> Population-COD environmental Gini coefficient (0.2070)> environmental capacity-COD environmental Gini coefficient (0.2886); when the NH3-N was the water pollution, the size of fairness was in sequence of: GDP- NH3-N environment Gini coefficient (0.2293)> Environmental Capacity - NH3-N environmental Gini coefficient (0.2689)> Population - NH3-N environment Gini coefficient (0.3188).In the industry total amount allocation, when the COD was the water pollution, the size of fairness was in sequence of: Fresh water-COD environmental Gini coefficient (0.1759)> Gross industrial output value -COD environmental Gini coefficient (0.4149); when the NH3-N was the water pollution, the size of fairness was in sequence of: Fresh water - NH3-N environment Gini coefficient (0.3856)> Gross industrial output value - NH3-N environment Gini coefficient (0.4018).In this paper, the initial total amount allocation program had been optimized,and the results showed that:in the optimization of regional total amount allocation, the Gini coefficient of the indexes optimized were more reasonable and fair; In the optimization of industry total amount allocation, the optimizing allocation model of the industry total amount was built. COD and fresh water emissions had reduced 82.65% and 29.15% respectively, while the gross industrial output value of the industry had increased 112.63%. Water resources and pollutant environmental capacities allocation were re-optimized , with more reasonable and coordinated between the social distribution and industry structure.