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AWWA ACE63077
- Microbial Bromate Reduction in a Hydrogen-Based, Membrane Biofilm Reactor: Inhibitory Mechanisms
- Conference Proceeding by American Water Works Association, 06/01/2006
- Publisher: AWWA
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The biological reduction of bromate (BrO<sub>3</sub><sup>-</sup>) in a hydrogen based membrane biofilm reactor(MBfR) was investigated to determine if bromate could be reduced below the MCL of 10µg/L, and the inhibitory impacts of nitrate and bromate concentration on bromate reduction.Reduction of bromate to below the 10 µg/L MCL was achieved with an influent nitrateconcentration of 5 mgN/L and influent bromate concentrations ranging from 150 µg/L to 1,500µg/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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