Please use this identifier to cite or link to this item: http://localhost:8081/xmlui/handle/123456789/2355
Title: BIOREMEDIATION OF CHROMIUM FROM INDUSTRIAL WASTEWATER
Authors: Dambhare, Shruti V.
Keywords: CHEMICAL ENGINEERING;BIOREMEDIATION CHROMIUM;INDUSTRIAL WASTEWATER;NEEM FLY ASH ADSORBENT
Issue Date: 2012
Abstract: Chromium remediation of industrial effluent is of special concern due to recalcitrant and persistency of it in environment. Conventional treatment technologies for the removal of this toxic heavy metal are not economical and further generate huge quantity of toxic chemical sludge. Biosorption is emerging as a potential alternative to the existing conventional technologies for the removal and/or recovery of chromium from aqueous solutions. In the present investigation, Azadirachta indica (neem) fly ash is used as an adsorbent for removal of chromium from aqueous solution. Batch experiments were performed to study the adsorption of chromium ions on neem fly ash adsorbent. Characterization of adsorbent was carried out using various techniques such as, FTIR, TGA, SEM, XRD etc. The equilibrium studies were sequentially carried out in batch process after optimizing various process parameters including pH of aqueous solution, adsorbent dosage, contact time of adsorbent, temperature and initial concentration of chromium. Optimum adsorbent concentrations for neem fly ash for removal of chromium at agitation period of 6 h are found to be 15 g/1. To facilitate mathematical modeling adsorption kinetics models as well as adsorption isotherms have been developed. Evaluation of experimental data in terms of biosorption kinetics showed that the biosorption of chromium (VI) by neem fly ash followed pseudo second-order kinetics. Therefore, the rate limiting step may be chemical sorption or chemisorptions. The Langmuir, Freundlich isotherm were used to describe the adsorption equilibrium studies. The maximum adsorbent capacity was found to be 40 mg/g. Freundlich isotherm shows better fit than Langmuir isotherm in the temperature range studied. Further, microorganism Pichia stipitis was used for the bio-removal of chromium supplemented with adsorption on adsorbents as well as biomass. It was found that percentage removal by simultaneous adsorption and bioaccumulation exceeded that of adsorption.
URI: http://hdl.handle.net/123456789/2355
Other Identifiers: M.Tech
Research Supervisor/ Guide: Balomajumder, C.
metadata.dc.type: M.Tech Dessertation
Appears in Collections:MASTERS' THESES (Chemical Engg)

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