Abstract
Sulfur-oxidizing autotrophic denitrification process has drawn significant attention due to its high efficiency, elimination of carbon requirement and the effluent contamination by organic compounds. In the process, nitrate and sulfur are used as electron acceptor, and electron donor, respectively. In the present study, a novel sulfur based autotrophic denitrification process utilizing membrane bioreactor (MBR) was tested for nitrate removal from drinking water. A bench-scale MBR equipped with hydrophilic flat sheet polyethersulfone (PES) membranes (0.45μm) was used. Sulfur was externally added to the MBR considering the theoretical requirement. Almost complete denitrification efficiency was achieved when the influent nitrate concentrations were 25–50mg NO3−-N/L at HRT as low as 5h corresponding to nitrate loading rates up to 0.24g NO3−-N/(Ld). The generated sulfate concentrations were close to the theoretical values. Membrane fouling was not significant at fluxes ⩽20L/(m2h).
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