Fig. 2

Process performances on COD concentrations profile from a SF1 and from b SF2, and nitrogen (NH4+-N, NO2−- N, and NO3−-N) concentrations profile from c SF1 and from d SF2

Process performances on COD concentrations profile from a SF1 and from b SF2, and nitrogen (NH4+-N, NO2−- N, and NO3−-N) concentrations profile from c SF1 and from d SF2