Disinfection of hospital waste sludge using hypochlorite and chlorine dioxide.
Hypochlorite and chlorine dioxide were used to disinfect hospital waste-water sludge. Their abilities to inactivate pathogenic micro-organisms were compared. Reductions in indigenous coliform organisms and Pseudomonas aeruginosa were estimated. The results indicate that hypochlorite is a better disinfectant than chlorine dioxide for coliforms. Higher disinfection efficiency was obtained by treating a lower concentration of sludge. In addition, a higher agitation speed gave a higher disinfection efficiency with hypochlorite. The disinfection efficiencies of both disinfectants were higher against settled sludge than against thickened sludge. Therefore, it is recommended that disinfection should be performed on settled sludge rather than in a thickening tank.
Tsai
C T
CT
Institute of Environmental Health of China Medical College, Republic of China.
Lin
S T
ST
D017606:Chlorine Compounds / Q000494:pharmacology*; D004202:Disinfectants / Q000494:pharmacology; D004203:Disinfection / Q000379:methods*; D004305:Dose-Response Relationship, Drug; D006092:Gram-Negative Facultatively Anaerobic Rods / Q000187:drug effects; D006761:Hospitals; D006997:Hypochlorous Acid / Q000494:pharmacology*; D010087:Oxides / Q000494:pharmacology*; D011550:Pseudomonas aeruginosa / Q000187:drug effects; D012722:Sewage / Q000382:microbiology*
D017606:Chlorine Compounds; D004202:Disinfectants; D010087:Oxides; D012722:Sewage; D006997:Hypochlorous Acid; C025109:chlorine dioxide