Recalcitrant dissolved organic nitrogen formation in thermal hydrolysis pretreatment of municipal sludge
Thermal hydrolysis pretreatment (THP) has been considered as an advanced approach to enhance the performance of anaerobic digestion treating municipal sludge.However, several drawbacks were also identified with THP including the formation of brown and ultraviolet-quenching compounds that contain recalcitrant dissolved gift_wrapping organic nitrogen