Anaerobic digestion of waste water using fluidized-bed reactor
1985
Weera Chanthai
The anaerobic waste treatment method of Ayudhaya distillery waste using a fluidized-bed reactor was investigated. This method provided reasonably good mixing and retention of a relatively high concentration of active microorganism. The media used to immobilize the biomass include K-carragenan, ion exchange resin and silica gel. Using a shake flask technique results indicated that a loading of 9 kg. of C.O.D./cu.m./day could be attained with good gas production as well as C.O.D. reduction. At this loading, 57.05 percent reduction of C.O.D. and the gas production rate of 8.33 m3/m3 of waste water were achieved with only 3.17 ppm. of suspended mater carried over in the overflow. These conditions could be maintained for about 20 days after which the K-carragenan gel beads became hollow due to excessice gas production. It showed that higher gel strength was required in this system. When ion-exchange resin and silica gel were used as fluidized-bed media and with 400 ml./min. of liquid recirculation to maintain fluidization of media. At this loading rate, gas production of 3 and 4.6 m3/m3 of waste water and C.O.D. reduction of 49.83 and 49.18 percent were found with ion exchange resin and silica gel, respectively. The suspended matter contents were 5.1 and 6.82 ppm. from ion exchange resin and silica gel. At higher loading capacities up to 15 kg. C.O.D./cu.m./ day, both systems could still perform effectively with 50.8 and 49.18 percent C.O.D. reduction and gas production of 4.8 and 5.3 m3/m3 of waste water with ion exchange resin and silica gel medium, respectively. Ion exchange resin seemed to be the most suitable medium since it is resistant to bio-degradation and could be an effective supporting medium for the micro-organisms
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