Treatment of chromium(VI) solutions in a pilot-scale bioreactor through a biofilm of Arthrobacter viscosus supported on GAC

Abstract

The aim of this work is to evaluate the applicability of a biofilm to the removal of chromium in solution, at a pilot scale. The effect of the initial concentration of metal on the biosorption behavior of an Arthrobacter viscosus biofilm supported on granular activated carbon, in batch and column essays was also analyzed. Six isotherm equations have been tested in the present study. The best fit was obtained with the Freundlich model. It was observed that as the initial chromium concentration increases, the uptake increases too, but the removal percentage decreases, with values between 95.20% (C(0)=5mg/l) and 38.28% (C(0)=1000 mg/l). The batch adsorption studies were used to develop a pilot bioreactor able to remove chromium from aqueous solutions. Data obtained in a pilot-scale reactor showed an average removal percentage of 99.9%, during the first 30 days, for the initial concentration of 10mg/l and an average removal percentage of 72%, for the same period and for the initial concentration of 100mg/l. Uptake values of 11.35 mg/g and 14.55 mg/g were obtained, respectively, for the initial concentration of 10 and 100mg/l. The results obtained are very promising and encourage the utilization of this biofilm in environmental applications.

Chitosan and Reinforced Chitosan films for the Removal of Cr(VI) Heavy Metal from Synthetic Aqueous Solution

“…The adsorption efficiency of Chitosan was studied by reinforcing with the Carbon rich and SiO 2 rich ashes, independently. The chemical, physical and optical changes in the films, resulting from these combinations were already reported by us 10 .…”

Stabilization of Cr(VI) from fine ferrochrome dust using exfoliated vermiculite

“…The absorption capacity of vermiculite is higher than that of kaolinite [35], zeolite [37], calcined bauxite [38], river bed sand [39], fly ash [43,44] and certain micro-organisms [49,50], and potentially also higher than that of montmorillonite [36],activated carbon [40,41], chitosan [42], coconut coir pitch [26], peat moss [45] and tamarind seeds [48].…”

Biosorption of Mn (II), Co (II) and Cr (VI) in a horizontal rotating tubular bioreactor: experiments and evaluation of the integral bioprocess model

“…The hydrodynamic behavior of these bioreactor systems was mostly described by a dispersion model. For description of the biosorption process in these systems different equations can be used such are Bohart-Adams (Wang, 2007;Kargi and Cikla, 2007;Chu, 2010;Chatterje and Schiewer, 2011), Langmuir (Chen and da Silva et al, 2002;Kogej et al, 2010;Ghasemi et al, 2011), Freundlich (Kogej and Pavko, 2001;Quintales et al, 2009a;Rezić et al, 2011a,b), a pseudo-second-order rate expression (Martins et al, 2014), or Yoon-Nelson (Chatterje andSchiewer, 2011).…”