Dry weather sewer intakes: the case study of the sanitary sewage system in the municipality of Armação dos Búzios (RJ)
Keywords:
Dry weather sewer intake, Sewer collection system, Water quality monitoring, Raw sewer discharges in water bodies, Armação dos BúziosAbstract
To increase sanitation services provided by existing sanitary systems and thus the protection of water bodies, the strategy of collecting sewage from drainage through dry weather sewer intakes has been increasingly used in Brazil. However, there is little data available, and technical and scientific knowledge on dry weather intakes is still incipient in Brazil. This research aimed to study the intakes system based on the functioning of this system in Armação dos Búzios (RJ). Parameters concerning the local climate and local sewage system were submitted to Spearman's statistical correlation test. Positive, variable and increasing correlations between rainfall precipitation, WWTP sewer flows and microorganism concentrations on the beaches potentially most affected by the intakes were found in most of the time frame adopted in the research (the 2010s). Part of these correlations is influenced by the increase in sewage flows due to tourist peaks in vacation and holidays periods during the year. The results were also influenced by the methodology for monitoring the adopted parameters, such as the period and frequency of sample collection campaigns and the location of the bathing monitoring points.
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