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Whereas ion exchange is an attractive technology for treating perchlorate and nitrate in drinking water, a major disadvantage is that the resin must be regenerated using a brine, producing wastes with high concentrations of nitrate, perchlorate, and salt. This study investigates the potential for simultaneous nitrate and perchlorate reductions in high-salt conditions using the H 2 -based membrane biofilm reactor ͑MBfR͒. The autotrophic biological reductions produce harmless N 2 and Cl − ,doi:10.1061/(asce)0733-9372(2007)133:2(157) fatcat:2g7s27ezdzgi7ablbqj4of7idq