Crab shell-based biosorption technology for the treatment of nickel-bearing electroplating industrial effluents.
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. NH3) 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.
Vijayaraghavan
K
K
Department of Chemical Engineering, Anna University, Chennai 600025, India.
Palanivelu
K
K
Velan
M
M
D000327:Adsorption; D000818:Animals; D001673:Biodegradation, Environmental; D049872:Bivalvia / Q000737:chemistry*; D004595:Electroplating; D007220:Industrial Waste; D009532:Nickel / Q000302:isolation & purification*; D018508:Water Purification / Q000379:methods*
D007220:Industrial Waste; D009532:Nickel