STUDY ON CHARACTERIZAION OF PeCB AND HCB IN RESIDUAL ASH FROM THERMAL INDUSTRIAL PROCESSES
The emission profiles and levels of PeCB, HCB and their correlation in bottom ash and fly ash from different thermal industrial facilities have been investigated in fly ash and bottom ash from thermal industrial proceses in Northern Vietnam. The results showed that concentration of PeCB and HCB in fly ash was higher than that in bottom ash. The level of PeCB, HCB and emission of PeCB, HCB in both bottom ash and fly ash from municipal waste incinerator were higher than thatfrom other incineratorand emission factor of PeCB in both bottom ash and fly ash was lower than that of HCB. The EFs values of PeCB and HCB in fly ash were 60 – 2500 μg/t and 10 – 600 μg/t, respectively, whereas, the EFs values of PeCB and HCB in bottom ash were 32 -1950 μg/t and 10 – 14400 μg/t, respectively. The strongest correlation of EFs between PeCB and HCB in bottom ash (r2=0.82) and fly ash (r2=0.91) was found using line regression suggesting emission of PeCB and HCB has similar formation mechanism fly ash and bottom ash from various thermal processes. These results can contribute the database on PeCB and HCB emissions in Vietnam, and could be used in the update data in the Toolkit for source categoriesand/or classes.