A study on adsorption of lead by adsorbents developed from crab shell
and cockle shell
การศึกษาการดูดซับตะกั่วโดยสารดูดซับที่เตรียมจากกระดองปูและเปลือกหอยแครง
Pitsanu Bunnaul, Asst. Prof., D. of Mining and Materials Eng., F. of Eng., PSU.
Sirichuen Tanusa, M.Sc. Student in Environmental Management, PSU.
Surapon Arrykul, Assoc. Prof., D. of Mining and Materials Eng., F. of Eng., PSU.
Kalayanee Kooptarnond, Asst. Prof., D. of Mining and Materials Eng., F. of Eng., PSU.
Corresponding e-mail : bpitsanu@ratree.psu.ac.th
Grant : Graduate School, PSU.
Presented : The 12th National Annual Conference 2000, Environmental Engineering Associa-
tion of Thailand, May 11-12, 2000, held at BITEC, Bangkok
Key words : lead, adsorpbent, crab shell, column adsorption
The purpose of this research is to study the capability of lead adsorption of adsorbents
prepared from crabshell and cockle shell which are residual materials available locally. Eight types
of adsorbents were studied which differs in type of raw materials, size and activating chemicals used. Among the adsorbents tested, an adsorbent prepared from crabshell, which was crushed and sized to 16x80 mesh and treated with hydrochloric acid, was found to be the best for lead adsorption. The adsorption constant from Freundlich adsorption isotherm was found to be 1,050 milligram lead per gram adsorbent. Continuous adsorption test for the adsorbent has been performed using lead-conta-minated water containing 0.042 mg/L of lead collected from an abundon lead-tin mine at Tambon
Tam Thalu, Bannangstar District in Yala Province. The column could treat the contaminated water
up to 500 bedvolumes before the concentration in the effluent was above 0.01 mg/L which was the standard for drinking water set by the WHO. However, the overall capacity of the column was found
to be up to 7,125 bedvolumes.
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