Insight into the gas pollutants emission of rural solid waste during the gasification-combustion process: Influencing factors and mechanisms

Abstract

With the rapid development of rural areas, effective disposal of rural solid waste (RSW) has emerged as a critical concern. In this study, the gasification-combustion technology concerning air-staged technology was employed in the treatment of RSW and its main components (rubber, PVC, and food waste(FW)). This study focused on analyzing the emission patterns and total amounts of NOx, SO2, and HCl. For RSW, the gasification-combustion experiment effectively reduced NOx and SO2 emissions compared to the combustion experiment. The amount and patterns of gaseous pollutant emissions were significantly impacted by changes in gasification temperature, combustion temperature, and proportion of air (PA). Besides, due to the interplay of RSW's constituents, the change in gasification temperature and PA resulted in different emission patterns for FW and RSW. Under the combined action of constituents, the trend of RSW SO2 emission amount was distinct from its S sources due to the potential sulfation impact. The RSW's HCl emissions were found to be minimally affected by changes in temperature, PA, and reaction technique. This research manages the miniaturized centralized incinerator disposal of RSW and helps the control of gas pollutants emission.