translate English to French: Nitrification is the microbial oxidation of ammonium (NH4+) to nitrate (NO3-) under aerobic conditions, and denitrification is the microbial reduction of nitrate to dinitrogen gas (N2) under anaerobic conditions.
La nitrification est lâ€™oxydation microbienne de lâ€™ammonium (NH4+) en nitrate (NO3-) en aÃ©robiose; la dÃ©nitrification est la rÃ©duction microbienne du nitrate en azote molÃ©culaire (N2) en anaÃ©robiose.