Abstract
The rational use of energy is being increasingly encouraged. In some countries, there are even subsidies for industries to adopt energy efficiency measures. One of the sectors with great opportunities for efficiency is sanitation, where a large part of energy consumption refers to pumping stations. The objective of this work is to demonstrate the consumption of electrical energy and possible reduction of electrical energy consumption in a sector of study of the Autonomous Water and Sewage Service (SAAE) of the municipality in the south of Minas Gerais. To determine the measures to be taken to reduce energy costs, it is necessary to perform a system diagnosis. For this, field trials were carried out. The study sector had an average expense of R$ 42,097.44/year due to water losses in the system. When considering only electricity costs, they represent 34.20% of the costs in relation to water losses (R$ 14,395.90/year). The system presented 27.73% of total water losses, an energy consumption of 0.6627 kWh/m³ only for the R3 pumping station and 1.302 kWh/m³ when also considering the Water Collection and Treatment Plant (WTP).
Highlights
The water supply is the primary element of an urban system
This paper aims to make a study and analyze the hydraulic, mechanical, and electrical parameters of a sector of a water distribution network in the municipality in the south of Minas Gerais, under the focus of the relation of the energy cost with the water losses
In October 2014, Serviço Autônomo de Água e Esgoto (SAAE) provided the value of only 5,714.00 m3/month of water billed in the study sector
Summary
Due to the rapid urbanization and scarcity of this resource, maintaining a stable and quality water supply has become a challenge for many cities, while a large amount of water is lost from the pipes of distribution systems. Leaks in distribution networks can compromise the final quality of water, through the insertion of pathogenic microorganisms, especially through the occurrence of hydraulic transients, during which pressures become low and even negative (Colombo et al, 2009). These leaks increase operating costs related to water loss and extra energy consumption, resulting in economic losses
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