Study on winter air pollution control in Lanzhou, China

Air pollution control is one of the most important issues in the cities of the developing countries. Based on an analysis of the local economic and technological development the paper puts forward 9 air pollution control schemes. They are 4 briquette schemes, 2 coal gas schemes, 1 centralized heating system and 2 comprehensive schemes. A comprehensive diffusion model combined with a 3-D advection-diffusion equation and the Gaussian puff model is developed and verified. According to the calculation of potential reduction of pollutant discharge and the corresponding air quality improvement made by each air pollution control scheme, the paper then works out a feasible and comprehensive air pollution control scheme, which is characterized by low investment and better environmental benefits. When the scheme is efficiently carried out, 19.3% SO(2) and 24.4% soot discharge is to be reduced annually in the city. There is a clear descent of air pollution concentration. The daily mean concentration of SO(2) and TSP declines 24.6-75.4% and 10.4-45.4%, respectively. SO(2) concentation of the whole city does not exceed the second grade of the Ambient Air Quality Standard of China except at a few grid points.