Avaliação da possibilidade do reaproveitamento da água oriunda da lavagem de equipamentos numa empresa de produção de baterias automotivas

Abstract

Water consumption in the productive sector of business is the important factors for economic and environmental viability of a region. Among the major companies in the economy of the state of Pernambuco, there is the Moura S / A, located in Belo Jardim - PE, the production of automotive batteries, also operating with a high water consumption. For each battery produced by the company, around 650,000 units / month, it is estimated to be consumed 22 liters of water, representing a total of 14,300 m³ / month. Part of this consumption, approximately 60,000 U / day, is related to cleaning equipment and the manufacturing floor. This effluent resulting from the wash is directed to lead settling tanks, the main component of the batteries, later to be transported by truck to an ETA and then discarded. This study aimed to assess the possibility of reuse of this water after passage through the settling tank for new washing equipment. It was quantified the lead present in the final settling tank, where there was a greater concentration than that permitted by environmental regulations. Following were proposed two treatments for this effluent: first from the control of pH; the second by pH control associated with the addition of a coagulant and flocculant. The results indicated that only the pH adjustment has not been possible to meet environmental legislation, however, to also add coagulant and flocculant, the lead concentration was reduced given the legislation and therefore the water could be reused for washing from the company. Further deepening the reuse of water, the implementation of this from an economic point of view was assessed in comparison to the traditional process. treatment costs and plumbing necessary for reuse were admitted. The results indicated that the cost of traditional treatment is initially cheaper, since the proposed process requires the purchase of pipes which represent fixed cost. After the acquisition of these pipes, it was observed that the cost of the new process is significantly less than traditionally practiced