Pilot scale studies on the remediation of chromium contaminated aquifer using bio-barrier and reactive zone technologies

Ex situ bioremediation of Cr(VI) contaminated soil by Bacillus sp.: Batch and continuous studies

“…Losi and Frankenberger (1994) examined the remediation of Cr(VI) contaminated soil in the presence of rich organic contents under aerobic condition and assessed the bioremediation potential [20]. The studies reported in the literature indicate that the ex situ bioremediation is a promising method for the complete removal of Cr(VI) from the contaminated soil [21][22][23][24][25]. The reaction products obtained by this method are less challenging for further treatment or disposal and other advantages include cost effectiveness, minimal disturbances to site operations, and less time consumption.…”

Mobility and Transformation of Inorganic Contaminants in Mining-impacted Groundwater

“…The pH increased slightly from 5.5-6.0 to 6.5-7.0 and alkalinity from <50 mg/L to 300-1300 mg L −1 . Biobarriers are also effective for the attenuation of Cr(VI) [87] radionuclide ions [88] and sulphates [89]. Sulphate concentrations were decreased from 1800 to < 250 mg L −1 and the mine waters neutralised using only bacterially-mediated alkalinity.…”

Diffusion and leachability index studies on stabilization of chromium contaminated soil using fly ash

“…Cao Zhang [7] conducted laboratory bench scale studies for remediation of COPR using nanoscale iron particles and reported that one gram of nanoparticles was able to reduce 69.3-72.7 mg of Cr(VI) present in the COPR, which is 50-70 times greater than that of iron powders under the same experimental conditions. Bioremediation of Cr(VI) contaminated aquifer using bio-barrier and a permeablereactive zone technology was investigated by Jeyasingh et al [8]. Solidification/stabilisation (S/S) is a containment technique which is widely used across the worldfor immobilisation/remediation of hazardous wastes.…”