Water Management and Wastewater Reuse in SRC Coal Liquefaction Facilities. Annual Report, September 1980-August 1981

摘要

This report describes studies performed in the first year of a three year project; the purpose of the project is to develop an understanding of issues important to efficient water management in coal liquefaction facilities. The focus of the project is on water management in the Solvent Refined Coal (SRC) direct liquefaction processes, with the main objective being to identify and evaluate zero discharge-oriented water management strategies that most effectively serve to decrease source water consumption in the SRC processes while minimizing cost of wastewater reclamation. This report begins with a review of the SRC processes followed by an examination of the wastewater treatment and water management strategies proposed for the SRC demonstration plants. The feasibility and effectiveness of the proposed water management schemes are discussed along with possible methods of optimizing water use and thereby reducing source water consumption. After review of water use optimization possibilities for the SRC demonstration plants, the most critical areas for study are identified. The scope of the investigation is then narrowed by selecting one area for detailed study, namely reuse of treated wastewater as cooling tower makeup. Next, past experience and problems with reuse of treated wastewater as cooling system makeup are examined, and the results of some experiments are presented that were performed to assess the effects of coal conversion wastewater reuse as makeup on chemical doses used in cooling water treatment. Tests showed that a tertiary treated coal conversion wastewater did indeed exert chlorine and chromate demands, but these demands were relatively small. (ERA citation 07:020761)