Alkali Soil Reclamation by Desulfurization Gypsum

Research Project , Research Report 2002

Masayoshi SADAKATA Dept. of Chemical System Engineering, Univ. of Tokyo
Steven KRAINES Dept. of Chemical System Engineering, Univ. of Tokyo
Yuji SAKAI Dept. of Chemical System Engineering, Univ. of Tokyo(Research Partners)
Xu XUCHANG Dept. of Thermal Engineering, Tsinghua University, China
K.R. POLENSKE Dept. of Urban Studies and Planning, Massachusetts Institute of Technology, USA

Abstract

Recently, environmental concerns have become serious problems with rapid economic development and industrialization in China. In this research, the alkali soil has been improved with the desulfurization waste for the purpose of solving the serious air pollution and desertification at the same time in China. We have been reclaimed the alkali soil field in Liaoning Province, China since 1996. As a result, the desulfurization gypsum produced by wet, semi-dry and simple wet desulfurization process and bio-briquette ash was confirmed as effective alkali soil amendments, respectively. In this report, we made the integrated model that can evaluate the economical (GDP etc.) and environmental assessment (CO2and SO2 emission) when this technology was introduced to China. Concretely, the integrated model is composed with the economic model based on the input-output table, the alkali soil reclamation model, the air diffusion model, and the patient generation model. Moreover, we calculated the CO2and SO2 emission and GDP when wet desulfurization process and bio-briquette are introduced to China. As a result, a real GDP growth rate of 0.56% and SO2 emission reduction of 8.53% were confirmed when wet desulfurization equipments was introduced to 30% of large coal-fired power plants (>250MW) in China (ScenariO2).

Keywords:

China, Air pollution, Desertification, Desulfurization waste, Environmental assessment