Monitorização dos parâmetros atmosféricos com carácter odorífico emitidos na Estação de Tratamento de Águas Residuais (ETAR) do Infulene-Maputo

Abstract

The odors emitted by urban wastewater treatment plants (WWTP) represent a potential problem for their urban environmental integration. On the other hand, some odors also represent a potential danger to safety and hearth of WWTP workers, the conservation of infrastructure and the efficiency of wastewater treatments. Therefore, knowledge about its occurrence, containment and treatment is fundamental for design. Odors that occur in wastewater treatment plants originate from volatile organic compounds (VOC) and volatile inorganic compounds (CIV). In turn, the emission of these compounds is influenced by meteorological conditions at the study site and the anaerobic conditions to which the wastewater from the Infulene WWTP is subjected. In order to determine the minimum and maximum values of the parameters can be uncomfortable for workers as well as occasional visitors, measurements of formaldehyde (HCHO) concentrations were carried out, total volatile organic compounds (TVOC) and suspended particles in the atmosphere (PM 10 ) in the wastewater treatment phases. Therefore, in the morning the minimum and maximum average concentrations of the parameters are 0.008 ppm and 0.339 ppm for formaldehyde respectively, 490μg/m 3 and 2783 μg/m 3 for total volatile organic compounds respectively, 120μg/m 3 and 347μg/m 3 for suspend particles respectively. And regarding the afternoon period, the following minimum and maximum values were detected, 0 μg/m 3 and 0.244 ppm for formaldehyde, 21μg/m 3 and 984 μg/m 3 for total volatile organic compounds, 0μg/m 3 and 203μg/m 3 for suspend particles. Based on the experimental work carried out, it was found that, on certain days and sampling points, the values exceeded the thresholds of the environmental legislation that governs these parameters, in accordance with international standards