Abstract
The effect of a sulfate reducing bacteria immobilized in polyvinyl alcohol (PVA) on simultaneous sulfate reduction and copper removal was investigated. Batch experiments were designed using central composite design (CCD) with two parameters, i.e. the copper concentration (10-100 mg/L), and the quantity of immobilized SRB in culture solution (19-235 mg of VSS/L). Response surface methodology (RSM) was used to model the experimental data, and to identify optimal conditions for the maximum sulfate reduction and copper removal. Under optimum condition, i.e. ∼138.5 mg VSS/L of sulfate reducing bacteria immobilized in PVA, and ∼51.5 mg/L of copper, the maximum sulfate reduction rate was 1.57 d-1 as based on the first-order kinetic equation. The data demonstrate that immobilizing sulfate reducing bacteria in PVA can enhance copper removal and the resistance of the bacteria towards copper toxicity.
Original language | English |
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Pages (from-to) | 4354-4361 |
Number of pages | 8 |
Journal | Bioresource Technology |
Volume | 101 |
Issue number | 12 |
DOIs | |
State | Published - 1 Jun 2010 |
Keywords
- Bioprecipitation
- Central composite design
- Heavy metal
- Polyvinyl alcohol (PVA)
- Sulfate reducing bacteria