Spatial and Temporal Effect on Heavy Metal Pollution of Atmospheric Dust in Fire Coal of City Power Plant

The heavy metal pollution on atmospheric dust made by fire coal of city power plant is receiving more and more attentions, but spatial and temporal effect researches on fire coal amount and heavy metal pollution of atmospheric dust after enterprise´ relocation out of urban area are comparatively less. This paper studied three thermal power plants in east city and Beihu Park on the outskirts, doing quantitative analysis on 5 types of heavy metal elements of atmospheric dust by x fluorescence analysis in 2004, 2006, 2009, and discussed spatial and temporal effect of atmospheric dust heavy metal pollution during the reduction of fire coal. The results indicated that: (1) Urban industrial fire coal had spatial effect on urban heavy metal pollution, the fire coal of thermal power plants would make more near-source pollution but less on the outskirts. Adjusting energy resource structure would make it positive for the immediate decrease of heavy metal in floating dust. (2) Urban industrial fire coal had temporal effect on atmospheric dust heavy metal pollution, no sooner than adopting fire coal Environmental Technology would reduce the contents of heavy metal in floating dust, and however, Zn often enriched in floating dust and made cumulative time effect. (3) The shutting down of thermal power plants could made a positive effect on the recovery of air quality, yet the demolition may cause more serious pollution so that a series of environmental protection measures should be considered to prevent re-polluting.