Characteristics of Biological Nitrogen Removal in a Multiple Anoxic and Aerobic Biological Nutrient Removal Process

Table 1

Influent and effluent water quality from the AO and multiple AO reactors (unit of mg/L).

	Influent	Effluent from the AO reactor	Effluent from the multiple AO reactor
COD	374	32.9	39.4
NH4-N	38.3	0.06	0.02
NO2-N	—	0.02	0.11
NO3-N	—	12.3	1.2
TN	—	12.3	2.2
PO4-P	9.8	0.26	0.25
TP	—	0.42	0.76