Emission Characteristics And Catalytic Degradation Reactor Of UP-POPs In Municipal Solid Waste Incineration

Polychlorinated dibenzo-p-dioxins (PCDD_s), Polychlorinated dibenzofuranes (PCDFs), Hexachlorobenzene (HCB) and Polychlorinated biphenyl (PCBs) are listed in Annex C of the Stockholm Convention on Persistent Organic Pollutants as uninten- tionally produced POP_s (UP-POP_s). Partis are required an action plan to reduce or eliminate emissions of UP-POP_s under Article 5 of the Convention. As an essential work for action plan, developing emission inventories could give a comprehensive understanding of emission status.Contained in National Implemetion Plan (NIP), a PCDD/Fs emission inventory of China (reference year 2004) was submitted to Secretariat of the Convention in April 2007. So far, there is no emission inventory of the other two UP-POP_s (HCB and PCBs). In order to obtain a preliminary understanding, the atmospheric emission inventory of HCB and PCBs from major sources in China was prepared, using the emission factors developed by the Ministry of the Environmental of Japan. Based on the estimation of emission inventory, trend analysis of key source was conducted. The industrial scale of municipal solid waste incineration has increased rapidly, and municipal solid waste incineration will become a major emission source of UP-POP_s in future. So this study selected a typical municipal solid waste incinerator to investigate the total emission amounts of UP-POP_s, as well as the emission characteristics.Since municipal solid waste incineration is an important potential source of UP-POP_s emission, it is urgent to reduce or eliminate emissions of UP-POP_s in this industry. Catalytic degradation is an effective technique for UP-POP_s control because it can decompose POP_s completely, so we choose catalytic degradation techique for further research. In this study a laboratory-scale reactor was designed to simulate the catalytic degradation of UP-POP_s in flue gas of municipal solid waste incinerator. After continous testing and improvement, the reactor can stably generate the gas stream with HCB concentration ranging from 10ng/L to 100ng/L. The reactor can also be used to test the effects of temperature, space velocity and other factors on the catalytic reaction, so it created conditions for research on catalytic degradation of UP-POP_s.