Scientia Agricultura Sinica ›› 2018, Vol. 51 ›› Issue (5): 926-939.doi: 10.3864/j.issn.0578-1752.2018.05.011

• SOIL & FERTILIZER·WATER-SAVING IRRIGATION·AGROECOLOGY & ENVIRONMENT • Previous Articles     Next Articles

Environment Risk for Application of Flue Gas Desulfurization Gypsum in Soils in China

WANG XiaoBin1, YAN Xiang1, LI XiuYing1, CAI DianXiong1, LEI Mei2   

  1. 1Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 1000812Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101
  • Received:2017-09-18 Online:2018-03-01 Published:2018-03-01

Abstract: Utilization of flue gas desulfurization (FGD) gypsum in China to improve alkaline soils started in the late 1990s. The FGD gypsum is a kind of desulfurized waste residue from power plant. It is an industrial by-product gypsum obtained by desulfurization and purification of flue gas produced by sulfur bearing fuel (mainly coal). With the increasing of installation of flue gas pollution control system, such as dust removal, desulfurization and denitrification in coal-fired power plants in China, more and more desulfurization by-product gypsum will be produced while reducing SO2 emission and other harmful gases in the process of coal combustion. The utilization of FGD gypsum has attracted more attention for solving the problem with increased disposal of desulfurization residues in power plants. Because the nature of FGD gypsum is similar to that of natural gypsum, some researchers have tried to use it instead of natural gypsum in the improvement of saline alkali land. However, since some enterprises introduced flue gas purification technology and synergistic mercury removal process, several hazardous pollutants in coal would inevitably transfer into FGD by-products (FGD gypsum and fly-ash). The process of FGD and synergistic mercury removal causes the enrichment of several hazardous pollutants in FGD gypsum (mainly Hg, F, Cl, and Se), and in FGD fly-ash (mainly As, Cd, Cr, Cu, Ni, Pb, and Zn). Research results indicated that the enrichment of hazardous pollutants could result in high levels of hazardous pollutants (especially Hg, Se, F and Cl) in some FGD gypsum in China, inordinately beyond the limits of Environmental Quality Standards for Soils and the limits of Environmental Quality Standards for Ground Water. In order to ensure soil health, food safety, and environmental quality, it was suggested that those FGD by-products without any harmless treatment of pollutants should not be allowed to use as for soil remediation or conditioning directly into the farmlands by solid waste disposal methods; especially material source and technology of desulfurization, application rate in farmland and long-term environmental safety risk should be concerted, to prevent hazardous pollutants from entering food chain and harming to human health.

Key words: industrial solid wastes, environmental safety risk, soil pollution, flue gas desulfurization gypsum, heavy metals

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