ĐÁNH GIÁ SƠ BỘ TỈ LỆ KIM LOẠI NẶNG TRONG TRO, XỈ TỪ MỘT SỐ LOẠI LÒ ĐỐT CÔNG NGHIỆP KHU VỰC PHÍA BẮC VIỆT NAM

Tóm tắt

This study focuses on the determination of the concentrations of heavy metals in ash and slag from 5
industrial incinerators in the northern region of Vietnam, by using ICP-MS technique.The study results
show that the proportions of heavy metals in the ash and slag of the 5 incinerators are quite different.
Cd contents in all types of samples (fly ash, bottom ash and metal dust) were lowest compared to all
other metals studied, accounting for from 2% to 5%. Meanwhile, Ni and Cr in the samples accounted
for the highest percentage, even up to nearly 80%. Arsenic is present in most bottom ash samples with
the proportion varied from 5% to 35%. The reasons of the large difference in the proportions of the
metals may be the variety of input raw materials, absence of appropriate cycle for material feeding
process and post-combustion technology used. These initial study results show that there exists risk of
heavy metal pollution by ash and slag, not properly treated and used during the industrial waste
incineration process.