Experimental Study On Bromined Pollutants Emission In Waste Printed Circuit Boards Combustion

With the development of society and the improvement of people's living standard,more and more electrical and electronic products are consumed,which brings serious waste electrical and electronic equipment(WEEE)treating problem.Waste printed circuit boards(PCBs),as a typical kind of WEEE,have great recycling value and great polluting potential.Finding a proper disposal method to recover and utilize PCBs is a big concern for the government and researchers.Incineration,as a method to treat domestic refuse,has been wildly used,when applying to PCBs disposal,can reduce its volume and enrich its metals.Meanwhile,PCBs usually contain brominated flame retardants(BFRs),when combusted,it will cause serious including Highly toxic brominated dibenzo-p-dioxins and dibenzofurans(PBDD/Fs).Researches on PCBs incineration,especially continuous feeding incineration are lacked.Based on that,this paper used sedimentation furnace to study PCBs combustion characteristics,and the pollutants distribution.Using TG-FTIR(under air atmosphere)to study the weight loss and gas emission characteristics of PCBs during combustion.The results show that during heating process,there are two quick weight loss processes,the first one appears at around 375?,which is caused by the release of volatile;and the second appears at around 480?,which is caused by the combustion of fixed carbon.The ignition temperature and burnout temperature can be calculated at 290? and 590?.Using sedimentation furnace to study the pollutant distributing disciplinarian in flue gas during PCBs combustion,especially focused on inorganic bromine and PBDD/Fs.Combining inorganic bromine and organic bromine,this paper has studied the mechanism of PBDD/Fs generation.