Water Intelligence Online © IWA Publishing 2002
Crab carapace: A Low Cost Biosorbent for the Removal of Copper from Aqueous Solutions
Ian B Rae
[UHI Millennium Institute, Environmental Research Institute (ERI) of the North Highland College, Caithness, Scotland]
ABSTRACT
Two milled crab carapace products, Commercial Cryogenically Milled Carapace (CCMC) and Mechanically Milled Carapace (MMC) were assessed for their ability to remove copper from aqueous solutions. Batch equilibrium studies were conducted to evaluate the influence of contact time, particle size, pH, metal concentration, sorbent mass and material processing on removal performance. Removal efficiencies of >85% (pH controlled) and >95% (no pH control) were achieved for both materials with mass 5 g, <250µm particle size and 40 mins contact time at a copper concentration of 500 mg/L. Chemical and physical analysis indicate that removal is a complex process and that copper may be sequestered from solution by a number of different mechanisms including: ion exchange, adsorption, absorption and precipitation. Effectiveness depending on contact time, pH, particle size, metal concentration and the physio-chemical characteristics of the processed materials.
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UNIQUE ID: 200207033
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