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Optimization of the Electron Donor Supply to Sulphate Reducing Bioreactors Treating Inorganic Wastewater (Paperback)
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Optimization of the Electron Donor Supply to Sulphate Reducing Bioreactors Treating Inorganic Wastewater (Paperback)
Series: IHE Delft PhD Thesis Series
Expected to ship within 12 - 19 working days
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The main objective of this research was to optimize the electron
donor supply in sulphate reducing bioreactors treating sulphate
rich wastewater. Two types of electron donor were tested: lactate
and slow release electron donors such as carbohydrate based
polymers and lignocellulosic biowastes. Biological sulphate
reduction was evaluated in different bioreactor configurations: the
inverse fluidized bed, sequencing batch and batch reactors. The
reactors were tested under steady-state, high-rate and
transient-state feeding conditions of electron donor and acceptor,
respectively. The results showed that the inverse fluidized bed
reactor configuration is robust and resilient to transient and
high-rate feeding conditions at a hydraulic retention time as low
as 0.125 d. The biological sulphate reduction was limited by the
COD:sulphate ratio (< 1.7). The results from artificial neural
network modelling showed that the influent sulphate concentrations
synergistically affected the COD removal efficiency and the
sulphide production. Concerning the role of electron donors, the
slow release electron donors allowed a biological sulphate
reduction > 82% either using carbohydrate based polymers or
lignocellulosic bio-wastes, in batch bioreactors. The biological
sulphate reduction was limited by the hydrolysis-fermentation rate
and by the complexity of the slow release electron donors.
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