Evaluation of Two Conceptual Wastewater Treatment Schemes for a Lurgi-Based Indirect Coal Liquefaction Plant

摘要

The objective of this study was to evaluate two conceptual treatment schemes for decontaminating the wastewaters likely to be generated in a conceptual dry-ash Lurgi-based indirect coal liquefaction plant. The conceptual indirect coal liquefaction plant is an integrated (i.e., all utilities generated onsite) facility designed to convert 15,000 tons of moisture- and ash-free coal per stream day to motor gasoline using dry-ash Lurgi coal gasification, Imperial Chemical Industries' methanol synthesis, and Mobil's methanol-to-gasoline processes. The conceptual plant is premised to be located at a generic site in the eastern United States and processes a generic Interior Basin high-sulfur bituminous coal. The following conclusions can be drawn from this assessment: (1) On paper, wastewater treatment facilities can be designed that are projected to treat the indirect coal liquefaction plant wastewaters to a level where the effluent will likely meet the current regulations for aqueous effluents for allied industries such as coke ovens and petroleum refineries. (2) The estimated capital investments, in 1983 US dollars, for the Case I (surface-discharge) and Case II (zero-aqueous-discharge) schemes are approximately $440 million and $550 million, respectively. These costs represent about 15 and 20% of the estimated capital investment for the integrated indirect coal liquefaction plant. (3) Case II (zero-aqueous-discharge) wastewater treatment is likely to result in the accumulation of approximately 1 million tons of toxic solid wastes during the 30 years of plant operation. (ERA citation 09:049360)