Resumo

FORERO, J. E et al. DESIGN AND EVALUATION OF OXYGEN TRANSFERENCE PROCESSES IN WASTEWATER TREATMENT. C.T.F Cienc. Tecnol. Futuro [online]. 1999, vol.1, n.5, pp.57-65. ISSN 0122-5383.

Aprocess of air injection to bodies of water was developed and evaluated. The system is composed of ejectors operated by pressurized water (where atmospheric air is drawn in), a network of contact and distribution pipelines (tubing), and a dispersion system. The influence and importance of each of these parts, especially the ejectors, was studied in order to create a model system that was compared with the most common types of aerators (oxygenators) used in industrial processes for water treatment. The energy efficiency (expressed as kilograms of oxygen transferred per kilowatt/ hour consumed) is used as the unit of comparison of the different processes studied. Furthermore, the comparative advantages of each of the systems were evaluated, namely maintenance, service factor, operation and installation viability, homogeneity, operational stability, adaptability to changing operating conditions among others. It was found that the appropriate industrial installation of an aeration system like the one proposed here, can generate over 30% in energy savings and a 90% reduction in maintenance costs among some of its major advantages.

Palavras-chave : water treatment; wastewater; aeration; oxygen exchange.

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