Operational characteristics of anaerobic packed-bed reactors

Laboratory and full-scale tests have shown that the operational characteristics of anaerobic packed-bed ractors are closely related to the physical design features of the reactor. The chemical oxygen demand (COD) removal efficiency seems to be inversely related to the upflow velocity through the void spaces within the media matrix. This means that the type and size of media are important factors in design but the efficiency does not seem to be related directly to either unit surface area or to porosity. While all operating characteristics have not been evaluated in depth and all design parameters have not been developed fully, anaerobic packed-bed reactors should be considered seriously as a method for converting a wide range of organic industrial wastes to methane gas. 7 figures, 1 table.