Transformation of nitritation-anammox into micro-granule multi coupling nitritation, denitritation with anammox and in-situ fermentation for advanced nitrogen removal from municipal wastewater

Providing nitrite through multiple pathways for anammox is a research hotspot. The micro-granule multi coupling nitritation-anammox (PNA), denitritation-anammox (PDA) and in-situ fermentation system was established in two-stage reactor for advanced nitrogen removal from municipal wastewater.