Sputum can be disinfected by all except
Autoclaving is the safest and most effective method for sputum disinfection Incineration is an effective alternative. Boiling used after an initial disinfection by 5% phenol (carbolic acid) or its derivatives like Lysol and Cresol.
Autoclaving
Chlorhexidine
Boiling
Cresol
General Microbiology Pa-2 and Pa-3 (Sterilization and Bacterial Genetics)