Study the catalyzing mechanism of dissolved redox mediators on bio-denitrification by metabolic inhibitors

- The role of AQDS on denitrification was first studied by metabolic inhibitors.
- The bio-denitrification rates were enhanced by dissolved redox mediators.
- AQDS concentration was relatively related to denitrification.
- AQDS eased the inhibitions of inhibitors and enhanced nitrate to nitrite.