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Water reuse potential at heavy-duty vehicles washing facilities – The mass balance approach for conservative contaminants

2017; Elsevier BV; Volume: 166; Linguagem: Inglês

10.1016/j.jclepro.2017.08.162

1879-1786

Eduardo Lucas Subtil, Raphael Rodrigues, Ivanildo Hespanhol, José Carlos Mierzwa,

Water-Energy-Food Nexus Studies

This study aimed to evaluate the water reuse potential at heavy-duty vehicles washing facilities using a full-scale treatment unit. The treatment unit was composed of a Rotating Biological Contactor and a filtration unit. To evaluate the reuse potential a mass balance was performed using the Total Dissolved Solids (TDS) parameter as the control contaminant. The treatment system was operated and monitored during a period of 5 months and produced an effluent with average concentrations of color, turbidity, TDS and Biological Oxygen Demand after 5 incubation days at 20 °C (BOD5,20) of 45 ± 14 μC, 15 ± 6.0 NTU, 244 ± 99 mg TDS/L and 14 ± 7.3 mg O2/L. Complementary treatment using an ultrafiltration unit can significantly improve the aesthetic characteristics of reuse water. Based on a mass balance and considering the TDS as the control contaminant, maximum reuse potential would be 40%, to a limiting TDS of 200 mg/L. If the system does make the final rinse operation with clean water, the reuse potential could reach 70%. In addition to water resources conservation, the proposed system can save up to 6500.00 US$ per year on operational costs.