title: Copper remediation by Eichhornia spp. and sulphate-reducing bacteria.
abstract: Eichhornia spp. biomass was collected from Chandola Lake, Ahmedabad, Gujarat, India. Point of zero charge of the biomass was pH 7.3. Flask study showed pH 5 and 2-3h contact time as optimum conditions for copper sorption with 67.25% copper removal. At the end of 24h of contact time, copper removal reached to 85.0%, from 100 ppm copper containing solution. Copper loading capacity of the biomass ranged between 9.9 and 28.5 mg g(-1) of biomass. To understand the interaction among pH, temperature, presence of nickel and zinc in the system, 2(4) factorial experiment was performed. Under the experimental conditions pH and interactions between pH-nickel, temperature-pH and temperature-pH-nickel-zinc were found to be significant with 60-74.7% copper removal. Langmuir isotherm was better fit as compared to Freundlich isotherm and pseudo-second order equation gave R(2) of 0.999 for biosorption kinetic of Eichhornia biomass. Reactor study showed 90% overall copper removal from 24 L of copper containing waste studied and sulphate-reducing bacteria played a significant role. SEMquant element analysis showed increase from 41.66% to 53.93%, 1.02-19.73% and 0.0-12.39% of chloride, aluminium and copper respectively in the loaded biomass as compare to unexposed biomass.
authors.affiliation: Department of Microbiology and Biotechnology, School of Sciences, Gujarat University, Ahmedabad 380 009, India. shaileshrdave@yahoo.co.in
authors.forename: Shailesh
authors.initials: S
authors.lastname: Dave
authors.forename: Maitry
authors.initials: M
authors.lastname: Damani
authors.forename: Devayani
authors.initials: D
authors.lastname: Tipre
mesh_terms: D000042:Absorption; D000465:Algorithms; D001419:Bacteria / Q000737:chemistry / Q000378:metabolism*; D018533:Biomass; D019149:Bioreactors; D003300:Copper / Q000032:analysis*; D031806:Eichhornia / Q000737:chemistry / Q000378:metabolism*; D052918:Environmental Restoration and Remediation / Q000379:methods*; D005618:Fresh Water / Q000032:analysis; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D015233:Models, Statistical; D013054:Spectrophotometry, Atomic; D013431:Sulfates / Q000737:chemistry / Q000378:metabolism*; D013696:Temperature; D013816:Thermodynamics; D014865:Waste Disposal, Fluid; D014874:Water Pollutants, Chemical / Q000032:analysis*; D018508:Water Purification
chemical_list: D013431:Sulfates; D014874:Water Pollutants, Chemical; D003300:Copper