In waste water treatment, disinfection is mainly achieved by either physical or chemical means. An example of a physical method for disinfection is UV, which disrupts microbial DNA (DNA and RNA in viruses) and therefore replication. Chemical methods include Sodium Hypochlorite (NaOCl), Chlorine Dioxide (ClO2), Ozone (O3) etc and are perhaps more widely used in industrial effluent processes.

Biochemica can assist in providing the most appropriate and effective means of disinfection for the particular process. Each method has its own advantages and disadvantages, so the correct disinfection programme is essential.