Abstract
Biological denitrification in a bench-scale continuous flow membrane reactor has been investigated. The nitrate-laden water treated was separated from the suspended denitrifying culture by a 0.02 μm average pore diameter membrane. Equal pressure was maintained across the membrane and nitrate was removed by molecular diffusion through the membrane and into the denitrifying culture. A nitrate removal efficiency of approximately 90% or a flux of 4 g NO 3 −–N/m 2/d of membrane area was achieved with an influent concentration of 20 mg/l NO 3 −–N. A mathematical model was developed to approximate system performance. Predicted effluent concentrations for the experiments conducted were 5.7, 9.5, 11.7 and 17.6 mg/l NO 3 −–N. The respective measured effluent concentrations were 2.3, 6.0, 9.0 and 16.0 mg/l NO 3 −–N.
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