A Study on the Improvement of Air Pollutant Permissible Discharge Standards in the Integrated Environmental Permission System

Objectives : Analysis of overseas cases, and evaluated feasibility of setting permissible discharge standards method in domestic integrated environmental permission system. Through the evaluation results, it is intended to improvement the method of setting permissible discharge standards.Methods : The method of setting permissible discharge standards in the United states, Germany and United kingdom were compared, and evaluated feasibility of the method was conducted by applying nitrogen oxide actual emission data. In addition, analyzed problems derived from the case of integrated permits and suggested solutions. Results and Discussion : It was confirmed that permissible discharge standards for pollutants were established by reflecting characteristics of country. As a result of evaluated feasibility of the permissible discharge standards setting method, when the criteria set by referring to overseas evaluation standards were applied rather than domestic evalution criteria, the number of stacks that required setting permissible discharge standard through discharge impact analysis tended to increase. Through this, it was confirmed that the method of setting permissible discharge standards in domestic system was not excessively strengthened. In standard modeling(AERMOD) of discharge impact anaysis, it was confirmed that topographical data and stack information had a great influence on calculation of process contribution.Conclusion In order to improve domestic integrated environmental permission system, it is necessary to consider reflecting effective stack height in AERMOD, setting the evaluation of ultrafine dust(PM-2.5) or Ozone(O3) with reference to the United States evaluation method or domestric environmental impact assessment evaluation method, applying a simplified analysis to company where the pollutants emitted have little effect on the air, applying ADJ_U * in order to prevent AERMOD pollutants from being overestimated at high concentrations when the atmosphere is stable and the wind speed is low.