COMPARAÇÃO DE SISTEMAS DE TRATAMENTO DE ÁGUAS RESIDUÁRIAS EM LAVA-JATO, VISANDO AO REÚSO

Abstract

One of the economic activities that demand a high amount of water resources within urban areas is the vehicle washing service, also known as “lava-jets”. The effluent generated is not reused and dumped into the environment without treatment. In this context, the objective of this study is to carry out the treatment of ARLJ- Lava Jato Wastewater, with systems that are low cost and easy to operate and maintain. Lava-Jato Esteticar, located in the municipality of Rio Verde (GO), was chosen for the implementation of the project, which consists of 2 different types of slow filtration systems, both followed by an activated carbon filter and a polypropylene filter. The following parameters were analyzed: pH, apparent color, true color and turbidity, comparing the results based on national standards. Treatment 1 presented the following average efficiencies: apparent color 88.53%; true color 80.98% and turbidity 94.28%. While treatment 2 presented the following average efficiencies: apparent color 93.04%; true color 90.79% and haze 97.93%. Both systems greatly clarified the raw effluent and showed good efficiencies, especially system 2 with results within the limits allowed in the national standard NBR13969 for reuse in vehicles. However, in operational terms, system 2 has a disadvantage, since it operates with lower flow rates. System 1 presents results accepted in less strict standards such as SABESP, and the treated water can be used for washing vehicles, washing floors, watering gardens, flushing toilets, among others.