Decay of free residual chlorine in wells water of northern Brazil
Date
2021
Authors
Vargas, Taise Ferreira
Baía, Célia Ceolin
Machado, Tatiana Lemos da Silva
Dorea, Caetano C.
Bastos, Wanderly Rodrigues
Journal Title
Journal ISSN
Volume Title
Publisher
Water
Abstract
The concentration of chlorine in water declines as it reacts with various substances, causing
decay of the residual free chlorine until its total consumption. In light of the typical characteristics of
the water from protected dug wells and tube wells, this study aimed to evaluate the decay kinetics of
free chlorine in the water of alternative individual supply (AIS) solutions used in the city of Porto
Velho in the Brazilian Amazon region. The free chlorine decay constant in the water was evaluated
by “bottle tests,” applying a first-order model. According to the results, the type of well and initial
chlorine concentration significantly influences the free chlorine decay speed. The water samples
from the tubular wells had lower chlorine demand levels, attributed to their better water quality.
The simulation of the residual chlorine decay in the different supply sources is an important tool to
support safe disinfection processes.
Description
Keywords
drinking water quality, disinfection, chlorine kinetics, Brazilian Amazon, free chlorination
Citation
Vargas, T. F., Baía, C. C., Machado, T. L.d.S., Dórea, C. C., & Bastos, W. R. (2021). “Decay of free residual chlorine in wells water of northern Brazil.” Water, 13(7), 992. https://doi.org/10.3390/w13070992