Removal of heavy metals using waste eggshell
PARK Heung Jai , JEONG Seong Wook , YANG Jae Kyu , KIM Boo Gil , LEE Seung Mok
DOI:
Received March 19, 2007,Revised June 27, 2007, Accepted , Available online
Volume 19,2007,Pages 1436-1441
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The removal capacity of toxic heavy metals by the reused eggshell was studied. As a pretreatment process for the preparation
of reused material from waste eggshell, calcination was performed in the furnace at 800°C for 2 h after crushing the dried waste
eggshell. Calcination behavior, qualitative and quantitative elemental information, mineral type and surface characteristics before and
after calcination of eggshell were examined by thermal gravimetric analysis (TGA), X-ray fluorescence (XRF), X-ray di raction (XRD)
and scanning electron microscopy (SEM), respectively. After calcination, the major inorganic composition was identified as Ca (lime,
99.63%) and K, P and Sr were identified as minor components. When calcined eggshell was applied in the treatment of synthetic
wastewater containing heavy metals, a complete removal of Cd as well as above 99% removal of Cr was observed after 10 min.
Although the natural eggshell had some removal capacity of Cd and Cr, a complete removal was not accomplished even after 60 min
due to quite slower removal rate. However, in contrast to Cd and Cr, an e cient removal of Pb was observed with the natural eggshell
rather than the calcined eggshell. From the application of the calcined eggshell in the treatment of real electroplating wastewater,
the calcined eggshell showed a promising removal capacity of heavy metal ions as well as had a good neutralization capacity in the
treatment of strong acidic wastewater.
