Abstract
Design and operational strategies for the coal gasification wastewater treatment with the fluidized-bed granular activated carbon (GAC) anaerobic reactor were discussed with the mathematical model presented. Equations which show the relationships at steady state between treatment performance and operational parameters, such as specific GAC replacement rate, GAC medium mass per reactor volume, superficial hydraulic retention time, influent COD loading, and strength of the wastewater. Critical and optimum growth conditions of the bacteria degrading inhibitory organics were also discussed and operational range of specific GAC replacement rate was determined for supporting the bacterial growth. Stability of the process against the step-increase and step-decrease in the wastewater strength was also discussed with xA-xH relation figure and trajectories on the xA-xH phase plane.
