中国における脱硫副産物を利用した塩類集積土壌改良の取り組みと今後の展望

概要

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With the aim of alleviating the problems of air pollution, soil desertification, and food shortage in China, the effect of amelioration of salt-affected soil using the by-products of flue gas desulfurization and coal bio-briquette have been studied in Liaoning, Ningxia, and Xinjiang Provinces, as well as Tianjin city in China. Concretely, the changes in soil properties, agricultural production, and safety as a soil amendment have been researched. As a result, soil pH and ESP (exchangeable sodium percentage) decreased and agricultural production increased in all the treated plots. Moreover, the contents of almost all metals (B, Cr, Mn, Ni, Cu, As, Cd, Pb, Se, Hg) in agricultural products were lower than the standard values for human intake and tolerance limit in food. In order to spread this effective technology, an evaluation model for assessing the environmental and economic effects and impact on the health has been developed. As a result, a decrease in SO2 emissions in provinces and cities and an increase in the area of reclaimed salt-affected soil and agricultural products, as well as decrease in the number of patients could be confirmed. In addition, a reduction in CO2 emissions in some cases, such as afforestation, biomass utilization, and introduction of energy crops, are examined.
日本海水学会の論文