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The biological reduction of bromate (BrOsub3/subsup-/sup) in a hydrogen based membrane biofilm reactor(MBfR) was investigated to determine if bromate could be reduced below the MCL of 10g/L, and the inhibitory impacts of nitrate and bromate concentration on bromate reduction.Reduction of bromate to below the 10 g/L MCL was achieved with an influent nitrateconcentration of 5 mgN/L and influent bromate concentrations ranging from 150 g/L to 1,500g/L. Pseudo-steady state experiments were conducted to examine the influence of nitrate andbromate on bromate reduction. Nitrate was shown to inhibit bromate reduction at concentrationsas low as 0.5 mgN/L. Bromate reduction followed Monod-type kinetics, with increased bromatereduction being achieved until an effluent bromate of 15 mg/L was reached. Over an extendedperiod of exposure to bromate concentrations greater than 15 mg/L, bromate appeared to exhibitan inhibitory effect on bromate reduction. The production of bromite, an intermediate ofbromate reduction, may be responsible for this inhibition. Includes 15 references, table, figures.

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Edition: Vol. - No. Published: 06/01/2006 Number of Pages: 11File Size: 1 file , 310 KB