Lectures on sterilization and disinfection. Principle of sterilization and disinfection Individual sterilization and disinfection processes Media-specific disinfection (water and wastewater) Media-specific disinfection (air and surfaces) Media-specific disinfection (infectious solids).
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Cl2 (g) + H2O <=> HOCl + Cl- + H+
HOCl <=> OCl- + H+ (at pH >7.6)
Ultraviolet irradiation: mechanism
ln Nt/No = - kCnt
No = initial number of organisms
Nt = number of organisms remaining at time = t
k = rate constant of inactivation
C = disinfectant concentration
n = coefficient of dilution
t = (exposure) time
Chick-Watson Law and deviations diagram
Contact Time (arithmetic scale)