出版社：Grupo de Pesquisa Metodologias em Ensino e Aprendizagem em Ciências
摘要：It is undeniable that water scarcity has been causing rationing in some large Brazilian urban centres. In view of that, the use of water-saving appliances appears as one of the alternatives for the conservation and efficient use of this resource, among them, the waterless urinals stand out, because they bring the savings benefit of water, despite the acquisition and operating costs. This article proposed to analyse the economic feasibility of the use of waterless urinal, for a project lifetime of 20 years, with data referring to the city of Joo Pessoa – PB (Brazil), comparing them with three types of sanitary appliances: conventional urinal (scenario 1), double-acting sanitary basin (scenario 2) and sanitary basin of single drive (scenario 3). For the residential category, the use of the waterless urinal was not analyzed for scenario 1, while in scenario 2, viability occurs above 20 daily uses for the intermediate charging and 7 daily uses for the highest value tariff. In scenario 3, viability is verified above 7, 4 and 3 daily uses for popular, average and high standard rate, respectively. For the commercial, industrial and public categories, the waterless urinals are economically viable in the scenarios that they replace the sanitary basins. In scenario 2, the numbers of daily uses for economic viability to occur are above 5, 4 and 4, and in scenario 3, 2, 2 and 2 for the commercial, industrial and public categories, respectively.
关键词：Waterless urinal;Economic feasibility;Rational use of water.
