Recovery of Nickel by Crystallization of Nickel Carbonate in a Fluidized-Bed Reactor

Ni(II) removal from aqueous solutions using cone biomass of Thuja orientalis

“…ln q e = ln q m − Kε 2 (10) where q e is the amount of the metal ion adsorbed at the equilibrium, K a constant related to the adsorption energy, q m the theoretical saturation capacity, ε is the Polanyi potential, equal to RT ln(1 + 1/C e ). The slope of the plot of ln q e versus ε 2 gives K (mol 2 (kJ 2 ) −1 ) and the intercept yields the sorption capacity, q m (mol g −1 ).…”

“…A number of technologies have been used to remove Ni(II) from wastewater streams, such as adsorption onto activated carbon [6][7][8], filtration of precipitate [9] and by crystallization in the form of nickel carbonate [10]. However, these technologies are most suitable in situations where the concentrations of the heavy metal ions are high.…”

“…They are either ineffective or expensive when heavy metals are present in the wastewater at low concentrations or when very low concentrations of heavy metals in treated water are required [5]. Alternative technologies of treating diluted wastewater streams have been studied in recent years [9][10][11]. Biosorption of heavy metals is an effective separation process for the removal and recovery of heavy metal ions from aqueous solutions.…”

Removal of nickel from aqueous solution by the bacterium Bacillus thuringiensis

“…While the nickel(II) ion concentration in plating rinse can approach 2-900 mg −1 , wastewater from paint and ink formulation, porcelain enameling, copper sulphate manufacture industries record effluent nickel(II) ion concentrations that varies from 0 to 40, 0.25 to 67 and around 22 mg l −1 [3]. A number of conventional methods have been used to remove nickel(II) ion from wastewater streams, such as adsorption on activated carbon [4]; chemical precipitation [5]; crystallization in the form of nickel carbonate [6]. However, these methods are ineffective or expensive when initial metal concentrations in wastewaters are low, or when very * Fax: +90 388 2250114.…”

Fines Formation (and Prevention) in Seeded Precipitation Processes

“…The technology was initially employed for the softening of drinking water by calcium carbonate precipitation 7) and the removal of phosphates from waste water, producing calcium phosphate 8) . More recently, fluidised bed reactors have been used for the removal of metals (nickel, copper and zinc) from solution 9,10,11,12) as carbonates or as sulphides. Kaksonen and co-workers 13) used biologically generated sulphide and alkalinity as the reagents to precipitate zinc and iron from acidic waste water in a fluidised bed reactor, whilst Esposito and co-workers 14) used the same sulphide source but precipitated only zinc from acidic waste water.…”