Tratamento de água da estação de lavagem de automóveis Dallas Carwash

Abstract

Car wash stations in Maputo use a large amount of water resources and most of them are built in an unconventional way, without government supervision and control, which end up resulting in excessive consumption of water and greater generation of effluents, in addition to the chemicals used in car washes, which are sent to the sewers, without any treatment. The present work aims to treat the water from the Dallas Carwash car wash station. The methodology used to prepare the work was bibliographical research, collection of samples in the field, laboratory tests with coagulation and electrocoagulation for comparison purposes. To obtain results, the effluent was characterized with analyses of pH, turbidity, Biological Oxygen Demand (BOD), Chemical Oxygen Demand (COD). After verifying the data, a simulation of the treatment was carried out through jar tests (Coagulation) using the coagulant aluminum sulfate and iron chloride, and electrocoagulation with aluminum and iron plates. From the results obtained, the removal was more satisfactory with electrocoagulation, due to better efficiency in the removal of turbidity, BOD, COD respectively (98%; 93%), (79%; 81%), (66%, 68%), for plates of aluminum and iron. Compared to the jar test with results of (96%; 90%), (75%; 80%), (58%, 65%) for aluminum sulfate and iron chloride.