Reúso e minimização do consumo de água em indústrias químicas utilizando a regeneração diferenciada de contaminantes

AUTOR(ES)
DATA DE PUBLICAÇÃO

2009

RESUMO

Currently there is a great demand for tools that allow the analysis of water nets in a practical and objective way. In the modern scenes the chemical, petrochemical, textile and of paper and cellulose industries consume great amounts of water and need to make it in more rational form, because that the water becomes a scarcer natural resource. The methodology of the Water Source Diagram (WSD) is a flexible and dynamic alternative to generate viable scenes for the management of the water nets with reduction of the water consumption. The WSD is used successfully to guide the search for alternatives that minimize the water consumption in real problems, making possible the use of industrial reuse, with or without regenerative processes, with mono or multiple contaminants. The development of an optimization methodology, that begins with the solution presented for the WSD and advances in the direction to verify the quality of the solution, must bring a systematization to evaluate complex operational conditions, where the attainment of a viable solution for the problem already is a challenge. In this work the implementation of the WSD in a process of differentiated regeneration is studied, treating in objective and systemic way the operation of a chemical process of interest. The possibilities of maximum reuse of water and differentiated regeneration are studied aiming to minimize the total flow of wastewater being treated inside the treatment units and the global net cost. In the study of case 1 it is verified that the value of minimum outflow regenerated told in literature (77.05 t.h-1) represents a cost of U$ 693 705.49, value 9.61% superior to the one calculated using the WSD. Using software GAMS it was possible to get a cost reduction of 16.33%, with a regeneration wastewater flow of 79.05 t.h-1. In the study of case 2, from the solution proposal in the level of minimum cost, it was obtained a rise of cost of 19.4% for a reduction of regenerated wastewater flow of 2.7%. Considering these results, it is possible to identify clearly that, in the majority of the process situations, must have conciliation between the interests of minimum cost and of minimum regeneration wastewater flow during the design and operation of the equipment.

ASSUNTO(S)

engenharia quimica agua - - consumo agua - - reutilização industria quimica engenharia quimica

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