Lead and vanadium removal from a real industrial wastewater by gravitational settling/sedimentation and sorption onto Pinus sylvestris sawdust.
Batch sorption with untreated Pinus sylvestris sawdust after settling/sedimentation phase to remove vanadium and lead from a real industrial wastewater was investigated using different adsorbent doses, initial pH, and contact time. The development of pH along the sorption test and a parallel investigation of metals release from sawdust in distilled water were carried out. In order to evaluate kinetic parameters and equilibrium isotherms, Lagergren first-order, pseudo-second-order, intra-particle diffusion and Freundlich models were explored. When the initial pH was reduced from 7.4 to 4.0, the sorption efficiency increased from 32% to 99% for Pb and from 43% to 95% for V. Whereas, V removal was positively correlated with the adsorbent dose, Pb removal was not. The sorption process was best described by pseudo-second-order kinetics. According to Freundlich parameters (K(f) and n) sawdust presented unfavourable intensity for sorption of V.
Kaczala
F
F
Faculty of Natural Sciences and Technology, School of Pure and Applied Natural Sciences, University of Kalmar, Kalmar, Sweden. fabio.kaczala@hik.se
Marques
M
M
Hogland
W
W
D000042:Absorption; D005374:Filtration / Q000379:methods; D031521:Fractionation, Field Flow / Q000379:methods*; D006112:Gravitation; D007220:Industrial Waste / Q000517:prevention & control*; D007854:Lead / Q000302:isolation & purification*; D041605:Pinus sylvestris / Q000737:chemistry*; D014639:Vanadium / Q000302:isolation & purification*; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*; D018508:Water Purification / Q000379:methods*
D007220:Industrial Waste; D014874:Water Pollutants, Chemical; D014639:Vanadium; D007854:Lead