In World Leather May 2007, a list was given of 45 papers that had been published which addressed various aspects of salinity that arise from leather manufacture. To make the compendium as complete as possible, some papers that were still awaiting publication were also included. This was an unusual step but, with consideration to the growing environmental pressures that tanners are facing, and to make the compendium comprehensive, it was considered right to include this material. The following is one of the papers that was awaiting publication, and concerns the use of carbon dioxide as a proven method of reducing the total dissolved solids (TDS) content of wastewaters. CSIRO was at the forefront in the investigation of this technology and its introduction into commercial use. When reading this paper, it should be remembered that the original report was produced in the early 1990s and, as it has only been subject to a very light edit, some minor details will have now changed. The information set down is, however, fundamental to the highly successful technology and this is probably the most informative study written on this subject.
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