The workshop identifies needs to be met by processing technology for wastewaters, and evaluates the suitability, approximate costs, and problems associated with current technology. Participation was confined to DOE Environmental Control Technology contractors to pull together and integrate past wastewater-related activities, to assess the status of synfuel wastewater treatability and process options, and to abet technology transfer. Particular attention was paid to probable or possible environmental restrictions which cannot be economically met by present technology. Primary emphasis was focussed upon process-condensate waters from coal-conversion and shale-retorting processes. Due to limited data base and time, the workshop did not deal with transients, upsets, trade-offs and system optimization, or with solids disposal. The report is divided into sections that, respectively, survey the water usage and effluent situation (II,9043 ); identify the probable and possible water-treatment goals anticipated at the time when large-scale plants will be constructed (III,9043 ); assess the capabilities, costs and shortcomings of present technology (IV,9043 ); explore particularly severe environmental-control problems (V,9043 ); give overall conclusions from the Workshop and recommendations for future research and study (VI,9043 ); and, finally, present Status Reports of current work from participants in the Workshop (VII).