Análise da viabilidade econômica e ambiental para a instalação e um sistema de reciclagem de água cinza na reutilização em atividades domésticas de um condomínio em Curitiba

Abstract

Due to impacts related to water scarcity, there is a need to develop technologies in order to provide a reduction in consumption, the availability to reuse and the treatment of this natural resource. The UN has made a prediction that by 2025, 2 billion people will be in a situation of chronic water scarcity. In Brazil, there are regions with extreme levels of risk of water crisis. Considering this scenario, an option to overcome this problem is the reuse of domestic wastewater, these are waters generated after the use of showers, washbasins, washing machines, sinks and laundry tanks, they are also called gray water due to their grayish appearance. The present work aims to carry out an analysis of economic and environmental viability with the aim of studying the economic and environmental benefits that the implementation of the gray water recycling system (RAC) can cause, in a condominium in Curitiba, to reuse gray water. in domestic activities. Therefore, data was first collected on the local water bill, carrying out research on companies that work with the RAC system, gathering information on financial and environmental issues. Having this information, it was possible to carry out an analysis of economic viability by calculating the NPV, IRR and payback and in the environmental analysis using the Leopold matrix, finding the most impactful activities and stipulating mitigating measures, then applying the 5W2H tool to develop a plan of action to comply with the measures and finally identify how the RAC system is aligned with Sustainable Development Goals (SDGs). The result of the work resulted in an NPV of R$ 248,552.48, IRR of 26.04% and payback of 22 months, being viable from an economic perspective. It is also viable after environmental analysis, as the most serious impacts have simple solutions, due to the need for services from companies in Curitiba or adjustments in the operation and implementation of the RAC system. And the project is also aligned with 2 SDG goals “Drinking water” and 1 SDG goal“Responsible consumption and production”, being beneficial from a global perspective.