Nitrate and bromate removal by autotrophic and heterotrophic denitrification processes: batch experiments

The effects of various parameters on bromate reduction were tested using lab-scale batch reactors with sulfur basedautotrophic and methanol based heterotrophic denitrification processes. the initial bromate (bro3–) concentration of100 and 500 ?g/l was completely reduced and bromide (br-) was produced stoichiometrically from bromate in allbatch reactors. in all experiments, nitrate was completely reduced to below detection limit. kinetic studies showedthat the sulfur-based autotrophic nitrate reduction rate increased with increasing initial nitrate concentration. atstoichiometrically sufficient methanol concentration as an external carbon source, nitrate and bromate were reducedto below us epa drinking water limits in heterotrophic denitrification conditions. the methanol was completelydepleted at the end of the heterotrophic operation conditions.