The start-up procedure of a laboratory fluidized-bed was monitored by an automatic control system. Twenty six days were necessary to increase the load from 1 to 35 kg COD/m3.d. The system took into account the pH of the liquid phase, the production of gas, and the concentration of hydrogen in the gas phase. These parameters were measured by on-line sensors. According to variations of these parameters, algorithm based on a principle very close to an expert system adjusted the flow-rate of the feeding pump. The automatic control system was tested in the following situations: perturbations in the process generated by large pH variations (± 0.2 to 0.7 pH unit) and organic overloads (from 50 to 100 kg COD/m3.d). After 44 hours of overloading, CH4 and CO2 concentrations in the gas phase were very useful to detect the deviation of the reactor.
Development of an automatic control system for monitoring an anaerobic fluidized-bed
F. Ehlinger, Y. Escoffier, J. P. Couderc, J. P. Leyris, R. Moletta; Development of an automatic control system for monitoring an anaerobic fluidized-bed. Water Sci Technol 1 October 1994; 29 (10-11): 289–295. doi: https://doi.org/10.2166/wst.1994.0772
Download citation file: