1. CHEMICAL TREATMENT
Intervention discouraged in plants dedicated to the transport of drinking water, as some traces of the chemicals used for the treatment may remain inside the system, compromising the potability of the water.
2. PHYSICAL TREATMENT
THERMAL SHOCK: provides for a significant rise in water temperature, up to about 70-80 ° C [temperature which determines the rapid death process of the bacterium]. To be effective it is necessary to raise the temperature for at least 3 consecutive days and the water must run off at all points of the plant for at least 30 minutes. Due to the high temperatures required, this treatment cannot be performed with all types of pipes
THERMAL DISINFECTION: it is a process that is mainly applied to sanitary water distribution systems. The water in the system is brought to a temperature exceeding 50 ° C, thus reaching the temperature range in which the bacterium starts the progressive death.
To increase the effectiveness of disinfection, moreover, the water must periodically reach a temperature between 65 ° C and 70 ° C.
We also recommend a complete recirculation of the system [at a temperature between 55 ° C and 65 ° C] to be carried out daily for at least 30 consecutive minutes. Due to the high temperatures required, this treatment cannot be performed with all types of pipes
RAISING RECIRCULATION 30 CONSECUTIVE MINUTES
35°C -45°C : critical range of development and proliferation
>55°: beginning of the progressive death of the bacterium
70°C -80°C :rapid death rate of legionella