Question

write the difference between nitrification and denitrification

Answer 1

                                 nitrification

Nitrification is the biological transformation of ammonium (NH4+) to nitrate (NO3–) by oxidation. Oxidation is defined as the loss of electrons by an atom or compound, or an increase in its oxidation state. The process is facilitated by two types of nitrifying aerobic bacteria that require the presence of oxygen molecules dissolved in their surroundings, to survive. [i]
   

                                   dentrification
  
Denitrification is the biological transformation of nitrate to nitrogenous gases by reduction.The process is facilitated by facultative bacteria; these are bacteria that do not require the presence of free oxygen for respiration. Denitrifying bacteria are heterotrophic organisms as they need an organic food source, in the form of carbon, to survive. Denitrification may start as rapidly as minutes after stimulation of the process