Abstract
Nickel adsorption onto a sludge wasting from a biological aeration tank is described in this work. This procedure is planned as an alternative method for metal removal from industrial effluents containing heavy metals in low concentrations. Experimental results of equilibrium adsorption and laboratory equipment operation are reported. Equilibrium data of nickel adsorption were fitted to the Freundlich equation. On the basis of this equation, the effect of several parameters such us metal concentration, sludge concentration and metal dosing rate were tested. Nickel removal efficiency is about 80% in the most favourable cases. Aeration during metal-sludge contact was also tested but little enhancing in metal uptake was observed. This analysis can be used to define the best operation conditions in practical cases either for metal or organic matter removal.
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Abbreviations
- A :
-
Parameter of Freundlich Equation (1)
- C e :
-
Equilibrium or treated effluent concentration of nickel (mg L-1)
- C 0 :
-
Initial or influent concentration of nickel (mg L-l)
- C s :
-
Sludge concentration (g L-1)
- HRT:
-
Hydraulic residence time, h
- n :
-
Exponential parameter of Freundlich Equation (1)
- SRT:
-
Sludge residence time, days
- t :
-
Time (min)
- r :
-
Specific retention of nickel (mg Ni g−1 sludge)
- R:
-
Yield of nickel removal (%)
- V i :
-
General name for a independent variable, Equation (6)
- X i :
-
Dimensionless and normalized variable defined in Equation (6)
- V a :
-
Added volume of metallic inflent (mL)
- V s :
-
Sludge volume (mL)
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Lombrarna, J.I., Varona, F. & Mijangos, F. Study of nickel sorption onto biological sludges. possibilities for heavy metals removal treatments. Water Air Soil Pollut 82, 645–658 (1995). https://doi.org/10.1007/BF00479417
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DOI: https://doi.org/10.1007/BF00479417