Figure 5: Diagrams of expected nitrogen transformation under anaerobic conditions.

(I) No NO₂⁻-N or inhibitors, (II) with NO₂⁻-N (100 mg L⁻¹) addition only, and (c) with NO₂⁻-N (100 mg L⁻¹) and inhibitors (ATU and NaClO₃). HD, heterotrophic denitrification; AD, AOB denitrification.