Possibilidade de reutilização de efluentes industriais: caso de Empresa Refrigerantes Spar, LDA

Abstract

This work is the result of an internship at the soft drink production company (Refrigerantes Spar, Lda) to study the possibility of reusing the wastewater from washing 18.9 L PET bottles to feed the cooling tower and boiler. To assess the quality of the effluent for reuse, analyses of physical and chemical parameters were performed using the following methods: conductometry, potentiometry, molecular absorption spectrophotometry, and Mohr's method. The following parameters were determined and presented in the results: pH (8.8±0.3); TDS (120±9 ppm); conductivity (181.5±12.3 μS/cm); alkalinity (48±7 ppm); total hardness (14±3 ppm); chlorides (32.9±3.5 ppm) and total iron (0.02±0.01 ppm). The results were compared with the water quality standards established by the Environmental Protection Agency (EPA) and the American Society of Mechanical Engineers (ASME) for cooling tower and boiler feed, respectively. The effluent resulting from bottle washing falls outside the water parameters for boiler and cooling tower feed, as per ASME and EPA, respectively. The total volume of effluent generated in the PET bottle washing process is 4.13 m3/day, which can be used for boiler feed.(TRADUÇAO NOSSA)