Alkaline thermal hydrolysis of sewage sludge to produce high-quality liquid fertilizer rich in nitrogen-containing plant-growth-promoting nutrients and biostimulants.To produce liquid fertilizer containing nitrogen-containing plant-growth-promoting nutrients (N-PGPN) and plant-growth-promoting biostimulants (N-PGPB) from sewage sludge is attracting increasing interest recently, due to its superb fertilizing effect and the ease of application.  Thus, this study aims to investigate the feasibility of producing high-quality liquid fertilizer with N-PGPN and N-PGPB recovery through alkaline thermal hydrolysis (ATH) using Ca(OH)2.  Results suggested that ATH treatment was superior in N solubilization (TSN/TN > 54%) and organic N maintenance in sludge liquor (> 80%) when compared to single thermal hydrolysis (TH). 
THERM