Emissions of PCDD/Fs and PCBs during the Cold Start-up of Municipal Solid Waste Incinerators

摘要: This study investigated the emissions of polychlorinated dibenzo-p-dioxins, dibenzofurans (PCDD/Fs) and biphenyls (PCBs) from 45-hr cold start-up operations (from ambient temperature) two municipal solid waste incinerators (MSWIs). Fifteen samples were collected during whole process, while sampling period was divided as follows: (1) initial stage (25-250°C); (2) second (250-850°C), final (850-1000°C). The peak total (PCDD/F + PCB) (WHO_(2005)-TEQ) concentration occurred start-up. could because temperature in combustion chamber reached 295-359°C, within window (250-450°C) PCDD/F reformation by de novo synthesis. However, both PCB concentrations still 2.8-3.8 times higher than regulated standards Taiwan 45 hours after began, demonstrating significant memory effects. Higher PCB/(PCDD/F TEQ fractions observed is probably due to volatilities memorized PCB-126 -169 congeners, thus making them more easily released into flue gas. On other hand, estimated at 46-68 mg WHO_(2005)-TEQ.The annual normal conditions are generally operating factor without emission rates MSWIs 70.7-101 WHO_(2005)-TEQ, including once emission, these increased 142-480 up 65-458%, if one eight included. Therefore, reducing unnecessary start-ups be important with regard controlling only attempting increase pollutant removal efficiency steady MSWIs.