Question

Compute the theoretical nbod of a waste water containing 30 mg/l of ammonia as nitrogen

Answer 1

the wastewater analysis was reported as 30 mg/L of ammonia (NH3), what would the theoretical NBOD be? NH3+ 2O2→NO3-+ H2O + H+(Solution) a) based on 30 mg/L NH3-N g O2(2 mol)(32 g/mol) 4.57 g O2--------------- = -------------------------- = -------------------- g (NH3-N) (1 mol)(14g/mol) 1 g (NH3-N) 4.57 mg/L O2= ------------------------ 1 mg/L NH3-N 4.57 mg/L O2Th NBOD = (30 mg/L NH3-N) (-----------------------) = 137 mg/L O21 mg/L NH3-N (b) based on 30 mg/L NH3g O2(2 mol)(32 g/mol) 3.765 g O2----------- = -------------------------- = --------------- g (NH3) (1 mol)(17 g/mol) 1 g NH33.765 mg/L O2= ----------------------- 1 mg/L NH3 3.765 mg/L O2Th NBOD = (30 mg/L NH3)(----------------------) = 113 mg/L O21 mg/L NH3