Characteristics of lead removal by crab shell particles

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The characteristics of lead removal by crab shell particles were investigated. The removal efficiency of lead was dependent on contact time, initial solution pH, crab shell dose, ionic strength, co-ion concentration and settling time. Approximately 99% of the lead was removed within 2 h after contact with crab shell particles. The removal efficiency was slightly affected by initial solution pH over 3.0. In addition, when the crab shell dose increased from 0.5 to 1.5 g/litre, 84% removal efficiency improved to 99.8% at initial pH 2.0. Maximum uptake of lead was 870 mg Pb/g crab shell at initial pH 3.0. Removal efficiency was not affected by ionic strength up to 1.0 M of NaNO3. Co-ions such as Cd2+, Cu2+, Fe2+, and Zn2+ did not decrease the removal efficiency significantly. All the solids formed in 'crab shell-free' solutions were difficult to settle. In contrast, in 'crab shell' solutions, the solids quickly settled which might be as a result of the adsorption of lead precipitates on the surface of the crab shell particles. (C) 1998 Elsevier Science Ltd. All rights reserved.
Publisher
ELSEVIER SCI LTD
Issue Date
1998-09
Language
ENG
Article Type
Article
Keywords

ACTIVATED CARBON; ADSORPTION

Citation

PROCESS BIOCHEMISTRY, v.33, no.7, pp.749 - 753

ISSN
0032-9592
URI
http://hdl.handle.net/10203/68559
Appears in Collection
CBE-Journal Papers(저널논문)
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