The
emission and formation characteristics of aerosols were studied
during the ammonia-based wet flue gas desulfurization (WFGD) process.
The particle characteristics before and after desulfurization were
measured in a power plant. The aerosol formation characteristics and
effects of operation parameters were investigated with an experimental
system. The results indicated that the aerosol emission was related
to the type of ammonia-based desulfurization technology and the particle
morphology and elements changed significantly during desulfurization.
Aerosols formed during desulfurization were from the heterogeneous
reactions and the entrainment and evaporation of desulfurization liquid.
The heterogeneous reactions made greater contribution to the aerosol
formation with different components, and smaller aerosols were generated.
With the decrease of gas flow velocity and the solid content of desulfurization
liquid, the aerosol concentration from the entrainment and the evaporation
of the desulfurization liquid decreased. The formation of aerosols
through the heterogeneous reactions could be inhibited with the decrease
of the pH value of the desulfurization liquid and the inlet flue gas
temperature.
The PBDE levels in Chongming Island were similar to those in European background soils, suggesting minimum influence of pollutants from the YRD via air, and wastewater inputs or few PBDE products were used herein. From the standpoint of eco-inland, more studies are needed to explore the reasons of PBDE difference by land use and to assess people intake PBDEs via agriculture products consumption in this region.
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