this study illustrates the process of removal of chromium from chrome tanning waste-water by fly ash which was drive from chrome shaving dust. this experiment was carried out in a batch process with laboratory prepared adsorbent samples and chrome tanning water collected from local tanneries. the influence of various factors likes adsorbent doses, contact time, and initial concentration of chro...

Aspergillus niger was treated with acid and immobilized in calcium alginate matrix. The dynamic removal of Cr (VI) ion was studied using continuously fed column packed with immobilized biosorbent beads. Column experiments were carried out to study the effect of various bed heights (20, 30, 40 cm) under different flow rates (5, 7.5, 10 ml min(-1)) on efficiency of biosorption. The maximum time (...

As conventional physico-chemical heavy-metal remediation technologies like ion-exchange, reverse osmosis, electrodialysis etc. are becoming extremely expensive, the possibility of use of microorganisms in bioremediation or biorecovery of different heavy metals from industrial effluents is extensively explored by different workers. Hexavalent chromium stressed environmental fungal isolates from ...

-Biofilm is communities of microorganisms attached to the surface and is able to concentrate metal species within their cell structure. Therefore, the aim of this study was to produce Escherichia coli biofilm on zeolite (clinoptilolite) and evaluate its ability for nickel (Ni) and chromium (Cr) adsorption from aqueous solutions. A laboratory-scale batch model was used for biodsorption assay. Th...

this paper presents the development of a model for evaluating adsorbable organic halogens’(aox) removal efficiency during wastewater treatment by using the micellar-enhanced ultrafiltration (meuf)technique. surfactants can form larger aggregates (micelles) were prepared into which aoxs dissolve and arethen retained by the membrane. synthetic wastewater samples containing certain concentrations ...

Chromium is a pollutant present in tannery wastewater, its removal is necessary for protection of the environment. Penisetum purpureum, Brancharia decumbens and Phragmites australis were grown hydroponically in experimental gravel beds to determine their potential for the phytoremediation of solutions containing 10 and 20 mg Cr dm. These concentrations, similar to tannery wastewater after initi...

chromium is one of the major causes of environmental pollution. to remove heavy metal ions from water, microorganisms can be used. in this study, dead fungal biomass of aspergillus niger is used. the biomass was boiled in 0.5 n naoh solutions to increase the metal removal capacity of a.niger and was applied when the ph of wash solution was in the normal range. the optimum adsorption ph value ob...

rice husk is as an organic solid waste material that has high adsorbing capacity in removal of heavy metal ions from wastewater, and can be very effective in treating industrial aqueous solutions that are important sources of water and soil pollution. in this study, the removal of zn(ii) and cr(vi) ions from aqueous solutions using rice husk was investigated. the investigated parameters include...

introductionthe expanding production of fuels, drugs, fertilizers, chemicals, and hazardous materials has caused considerable environmental contaminations. the contamination of soil and groundwater with petroleum hydrocarbon-based fuels as a result of accidental spills or improper storage has been reported frequently. iran is seriously facing soil contamination problem, due to owning 8.58% of t...

Toxic heavy metal pollution of water and soil is a major environmental concern for which conventional remediation approaches do not provide an appropriate solution. Phytoremediation, which involves removal of pollutants from water and soil through plants, is of low cost and environmentally friendly. In this study, the phytoremediation potential of Lemna minor for the uptake of Cr(VI) at the opt...