| Hechuan, located in a vital district of Northern Chongqing, the government of which has organized and developed the total control of regional air pollutants to respond to the relevant requirements of Chongqing municipality for cooperation in prevention action plan on atmospheric pollution. This study aims at air quality affected by three main atmospheric pollutants PM10, SO2, NO2, collects monitoring data of them, as well as ambient temperature, velocity and direction of wind, layout of pollution sources and other related information during 2011-2014 for analysis of regional distribution and emission of major sources. Based on the above investigation, atmospheric capacity calculation and the total control of major pollutants are finally completed in Hechuan.During the processes of environmental capacity calculation, puff integral diffusion mode which greatly applied to the state of small or static wind, as well as the characteristics of simple box model are combined to solve the real diffusion pattern in Hechuan. A multiple dimension and box model based on the puff integral calculus mode is built to simulate and calculate the concentration of pollutant and related environmental capacity. After input of annual emission, it predicts the mean concentration of pollutant in the monitoring sites by running the program of model. Then it is proved that the prediction of this model is reliable because the relative errors of calculated results and monitored values which present less than 36% range between an acceptable extent.A-P value method recommended in national standard GB/T13201-91 and multiple dimension and box model constructed on the basis of puff integral calculus mode and single-box method are applied to the calculation of atmospheric capacity of three main pollutants. Results of A-P method on SO2, NO2 and PM10 are: 3.9278 ×104t/a, 3.7821×104t/a, 5.3097×104t/a, respectively, which are close to or slightly higher than the multiple dimension and box model calculation: 3.9318×104t/a, 3.0711×104t/a, 4.3321×104t/a. multi dimension multi box model to predict the result from the relatively small. The difference may result from non-consideration of the meteorological factors influence and interaction of pollution sources to each other.The current industrial emission is collected and the regional traffic source, no tissue sources and non-point domestic emission is estimated via empirical formula, thus the total pollutant emission is obtained. Based on the elementary information and collected or calculated data, considering the assessment of the atmospheric capacity and the distribution of industrial output value, it is determined a seriously unreasonable distribution of pollutant emission occurs whether for environmental capacity or for industrial production. Since the Gini coefficient value of emission distributional plan is about 0.55, which is more than the warning value 0.5. Through emission cuts in part regions, the Gini coefficient around 0.5 is obtained on the environmental capacity indicators and industrial output index, and finally the corresponding total allocation plan is completed.The above research would provide some decision-making basis for Hechuan government to adjust enterprises and industry layout of high pollutant emissions, to optimize the industrial structure, and to realize pollutant total control through multiple aspects. In addition, this study aims at special meteorological characteristics of investigated region, and works on construction of specific air quality model on the purpose of giving reference and advice for other regions intending to investigate or calculate the atmospheric environmental capacity. |
PDF Full Text Request