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Evaluation of the performance of a new freeze desalination technology

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Abstract

The use of desalination technologies which produce concentrated brines is acutely limited by inadequate waste brine disposal mechanisms such that the brine does not contaminate fresh water resources. The treatment of highly saline brine using freeze desalination technique trade marked as HybridICE™ technology was investigated at pilot scale. The capacity of the HybridICE™ process to generate fresh water by freeze desalination of brine was investigated in this study. Brine samples to feed into the HybridICE process unit were prepared in tanks with volume capacities between 1.0 and 10.0 m3 by dissolving common salt into tape water. The effects of refrigerant temperature, initial brine concentration, energy consumption were evaluated in relation to product ice quality. Feed brine samples were processed in batches in a closed system where it was continuously re-circulated to generate product ice and more concentrated residual small volume of brine stream. The quality of ice produced could be turned into potable water it terms of its low total dissolved salts and conductivity. The salt removal, based on the average chloride concentration in the ice samples, was 96 %. The energy utilization efficiency amounted to an average of ZAR 10.0/m3 water assuming energy cost of ZAR 0.39/kWh. The HybridICE™ technology was shown to be a better option than other desalination technologies currently in use, in terms of energy utilization and cleaner by-products.

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Acknowledgments

We thank Tshwane University of Technology, THRIP program of NRF-RSA Grant Number 2010[71807], Rand Water for funding and Aqua-Simon UG for technical assistance.

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Authors and Affiliations

  1. Department of Environmental, Water and Earth Sciences, Tshwane University of Technology, 175 Nelson Mandela Drive, Arcadia, Pretoria, South Africa

    T. Mtombeni, J. P. Maree, C. M. Zvinowanda & J. K. O. Asante

  2. Aqua-Simon UG, Rabenslücke 40, 24944, Flensburg, Germany

    F. S. Oosthuizen

  3. Marlow Aquatec (Pty) LTD, 1100 Church Street, Colbyn, Pretoria, South Africa

    W. J. Louw

Authors
  1. T. Mtombeni
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  2. J. P. Maree
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  3. C. M. Zvinowanda
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  4. J. K. O. Asante
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  5. F. S. Oosthuizen
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  6. W. J. Louw
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Correspondence to C. M. Zvinowanda.

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Mtombeni, T., Maree, J.P., Zvinowanda, C.M. et al. Evaluation of the performance of a new freeze desalination technology. Int. J. Environ. Sci. Technol. 10, 545–550 (2013). https://doi.org/10.1007/s13762-013-0182-7

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  • DOI: https://doi.org/10.1007/s13762-013-0182-7

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