Research On Reasonable Setting Of Health Protection Zone For Petrochemical Enterprises

The setting of the health protection zone for petrochemical enterprises had been directly related to the health of surrounding residents and business development. Therefore, a reasonable setting of health protection zone had been very important for petrochemical enterprises. Currently, the standards of setting protection zone for petrochemical enterprises in China include:"Health Protection Zone Standard for Refinery", "Technical Methods for Making Local Emission Standards of Air Pollutants", "Health Protection Zone Standard for Petrochemical industry". In addition, in the " Guidelines for Environmental Impact Assessment-Atmospheric Environment", had proposed a new concept of the atmospheric environment protection zone and the calculation method. The protection zones calculated by those standards were inconsistent. That had caused troubles for development of the enterprise and the health of surrounding residents. With field research, collection data of the petrochemical enterprises, the paper analyzed the bases, background content and other aspects of the four standards. The results showed that:(1) Health protection zone and the atmospheric environment protection zone had the differences of the calculation principle, the parameter setting, the range, the result levels etc. But the purpose of them was protection the health of residents. So it was should to calculate both of them, then combine with the actual situation and the ultimate of the project to determine the final protection zone. (2) Reasonably setting the Health protection zone and the atmospheric environment protection zone of petrochemical enterprises, should select the appropriate criteria, based on the production scale and the property of enterprises:i) Medium and small scale oil refinery using the four standards to calculate its protection zone; small chemical enterprises, using the "Health Protection Zone Standard for Petrochemical industry" calculated the zone; small fertilizer plant using the "Health Protection Zone Standard for Small nitrogenous fertilizer plants" calculated the zone and referenced the results calculated by "Technical Methods for Making Local Emission Standards of Air Pollutants", "Guidelines for Environmental Impact Assessment-Atmospheric Environment",ⅱ) Large oil refinery, large chemical enterprises using the "Technical Methods for Making Local Emission Standards of Air Pollutants", "Guidelines for Environmental Impact Assessment-Atmospheric Environment" calculated the zones; medium and the large chemical fertilizer plant, using the "Health Protection Zone Standard for Petrochemical industry" calculated the zone, and referenced the results calculated by "Technical Methods for Making Local Emission Standards of Air Pollutants", "Guidelines for Environmental Impact Assessment-Atmospheric Environment".In addition, it should be considered the actual situation of the fugitive emission sources, weather conditions and terrain conditions and other factors the project. (3) Though the concentration monitoring of fugitive emissions for the petrochemical enterprises, using the ground-inverse method to calculate the concentration of each fugitive emission source. Then selecting the appropriate standards to calculate the protection zones for various devices and drawing the envelope, using AERMOD model to simulated the diffusion of the fugitive air emissions. Analyzed the proliferation of simulation results and the results calculated by the standards;lastly, ensure protection human health and select the smallest distance as the final health protection zone of the project, Crude oil deacidification unit:450m, storage tank:0m, wastewater treatment plant: 750m.