highly significantp < 0.05
( 1999 ) concluded the highly significant linear correlation between dose of ERY (10, 20, 40, and 80 mg/L) and its inhibition on ammonia removal (correlation coefficient r = 0.890, probability value p < 0.05) and nitrate production ( r = 0.937, p < 0.05), in which the reported inhibition percentage of ammonium oxidation and nitrate production was 0.20% and 0.28% at ERY of 1 mg/L.