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548360 
Journal Article 
Crab shell-based biosorption technology for the treatment of nickel-bearing electroplating industrial effluents 
Vijayaraghavan, K; Palanivelu, K; Velan, M 
2005 
Yes 
Journal of Hazardous Materials
ISSN: 0304-3894
EISSN: 1873-3336 
119 
1-3 
English 
This paper discusses the possible application of a biosorption system with acid-washed crab shells in a packed bed up-flow column for the removal of nickel from electroplating industrial effluents. Between two nickel- bearing effluents, effluent-1 is characterized by considerable amount of light metals along with trace amounts of lead and copper. Effluent-2 is characterized by relatively low conductivity, total dissolved solids and total hardness compared to effluent-1. Crab shells exhibited uptakes of 15.08 and 20.04 mg Ni/g from effluent-1 and effluent-2, respectively. The crab shell bed was regenerated using 0.01 M EDTA (pH 9.8, aq. NH sub(3)) and reused for seven sorption-desorption cycles. The EDTA elution provided elution efficiencies up to 99% in all the seven cycles. This, together with the data from regeneration efficiencies for seven cycles, provided evidence that the reusability of crab shell in the treatment of nickel-bearing electroplating industrial effluents is viable. 
Article Subject Terms: Absorption; Conductivity; Copper; Crabs; Data; processing; Dissolved Solids; Edetic acid; Effluent treatment; Effluents; Electroplating; Hardness; Hazardous materials; Heavy; metals; Industrial Wastewater; Industrial effluents; Industrial; wastes; Lead; Light effects; Metal finishing industry wastes; Nickel; Shells; Sorption; biosorption; pH; pH effects; Article Taxonomic; Terms: Decapoda; P 3000 SEWAGE & WASTEWATER TREATMENT; SW 3040 Wastewater treatment; processes; Q1 01281 General; X 24360 Metals; EE 50 Water &; Wastewater Treatment