Biological removal of hexavalent chromium in trickling filters operating with different filter media types

Dermou, Eftychia; Velissariou, A.; Xenos, D.; Vayenas, D.V.

doi:10.1016/j.desal.2006.02.090

Cited by 15 publications

(3 citation statements)

References 26 publications

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“…The culture medium was prepared according to the procedure described by Dermou et al (2007). Namely, 1 g of NH 4 Cl (acclimation experiments), 0.2 g of MgSO 4 Á7H 2 O, 0.001 g of CaCl 2 Á2H 2 O, 2.5 g of CH 3 COONaÁ3H 2 O (acclimation experiments) and 0.5 g of K 2 HPO 4 were dissolved in 1 l of tap water.…”

Section: Methodsmentioning

confidence: 99%

“…Another important fact is due to the needs of the mixed culture used. Dermou et al (2005) and Dermou et al (2007) used 1 g l -1 of NH 4 Cl as a nitrogen source and obtained significant Cr(VI) removal rates. Chen and Gu (2005) used 100 mg l -1 of NH 4 SO 4 , and good results for the removal of Cr(VI) were obtained.…”

Section: Cr(vi) Bioremovalmentioning

confidence: 99%

“…The initial hexavalent chromium concentrations were selected according to the concentration of total chromium present in the tannery effluents. The selected concentrations of sodium acetate and ammonium chloride were based on data obtained from the literature to be representative of tannery effluents (Dermou et al 2005;Dermou et al 2007;Chen and Gu 2005). The CCD consisted of 2 3 factorial points, six axial points and three replicates at the central point.…”

Section: Design Of the Experimentsmentioning

confidence: 99%

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Evaluation of the bioremoval of Cr(VI) and TOC in biofilters under continuous operation using response surface methodology

et al. 2011

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In the present study, the bioremoval of Cr(VI) and the removal of total organic carbon (TOC) were achieved with a system composed by an anaerobic filter and a submerged biofilter with intermittent aeration using a mixed culture of microorganisms originating from contaminated sludge. In the aforementioned biofilters, the concentrations of chromium, carbon, and nitrogen were optimized according to response surface methodology. The initial concentration of Cr(VI) was 137.35 mg l(-1), and a bioremoval of 85.23% was attained. The optimal conditions for the removal of TOC were 4 to 8 g l(-1) of sodium acetate, >0.8 g l(-1) of ammonium chloride and 60 to 100 mg l(-1) of Cr(VI). The results revealed that ammonium chloride had the strongest effect on the TOC removal, and 120 mg l(-1) of Cr(VI) could be removed after 156 h of operation. Moreover, 100% of the Cr(VI) and the total chromium content of the aerobic reactor output were removed, and TOC removals of 80 and 87% were attained after operating the anaerobic and aerobic reactors for 130 and 142 h, respectively. The concentrations of cells in both reactors remained nearly constant over time. The residence time distribution was obtained to evaluate the flow through the bioreactors.

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Section: Methodsmentioning

confidence: 99%