Calculations
Input data
Temperature
pH
Free residual chlorine concentration
Output data
Minimum contact time
Description
Given the pH, the temperature and the concentration of chlorine in water, finds the necessary contact time to assure its disinfection.
Annex 3
Table of minimum contact time to be observed for disinfection in collective alternative water supply systems and solutions with collection from surface water sources, according to the concentration of free residual chlorine, the temperature and the pH of the water.
Annex 4
Table of minimum contact time to be observed for disinfection in collective alternative water supply systems and solutions with collection from surface water sources, according to the concentration of combined residual chlorine (chloramines) and the temperature of the water, for water pH values between 6.0 and 9.0.
Annex 5
Table of minimum contact time to be observed for disinfection in collective alternative water supply systems and solutions with collection from surface water sources, according to the concentration of chlorine dioxide and the temperature of the water.
Annex 6
Table of minimum contact time to be observed for disinfection in collective alternative water supply systems and solutions with collection from underground sources, according to the concentration of free residual chlorine, the temperature and the pH of the water.
Annex 7
Table of minimum contact time to be observed for disinfection in collective alternative water supply systems and solutions with collection from underground sources, according to the concentration of combined residual chlorine (chloramines) and the temperature.
Annex 8
Table of minimum contact time to be observed for disinfection in collective alternative water supply systems and solutions with collection from underground sources, according to the concentration of chlorine dioxide and the temperature of the water.
References
- BRASIL. Ministério da Saúde. Gabinete do Ministro. Portaria GM/MS n° 888, de 4 de maio de 2021. Brasília, 2021.