As shown in (Fig. 2) and 90% of BOD5 was eliminated in the
unsterilized wastewaters (residual BOD5 less than 10 mg/L), suggesting
that the bio-degradable organic compounds had been almost
completely degraded. The removal rate and the average
daily removal rate of BOD5 is positively related to TN concentration,
and reached a peak at 99% and 29 mg/(L d) when the TN concentration
reached 246 mg/L.