many schemes are already implements in slaughterhouses for the reuse of water for non-portable uses within the plant. most of these involve no treatment of the water prior to its reuse. Kane and Osantowski (1981) described a pilot-plant study in which treated wastewater was passed through chemical clarification and dual media filtration prior to further upgrading by either ionexchange, reverse osmosis (RO) or electrodialysis. all the latter three processes achieved greater than 90% reduction of TDS, however, the use of RO was the economic, with estimated capital and operating costs for a 3.8 MI/day (1 MGD) system being at most 40 and 68%, respectively. of those of the other two processes. furthermore, it required only half the space. it is not known whether the system has been installed at full scale.