Fig. 4
The USB reactor profiles during UP1 and UP2. pH (a), DOC (b), NO3−-N (c) and NO2−-N (d). The abbreviations “Inf” and “Eff” stand for influent and effluent, respectively
Fig. 4 | Sustainable Environment Research
The USB reactor profiles during UP1 and UP2. pH (a), DOC (b), NO3−-N (c) and NO2−-N (d). The abbreviations “Inf” and “Eff” stand for influent and effluent, respectively