Journal of Industrial and Engineering Chemistry, Vol.13, No.7, 1149-1153, December, 2007
Solubilization of Waste Activated Sludge with Alkaline Treatment and Gamma Ray Irradiation
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Alkaline pretreatment and gamma ray irradiation were applied to destroy the refractory structure of waste activated sludge (WAS) and to increase its biodegradability. This study was conducted to investigate the effects of alkaline treatment and gamma ray irradiation on the hydrolysis of WAS. The initial total solid (TS) concentration can be insignificantly affected by the solubilization of WAS due to alkaline treatment and gamma ray irradiation. The suspended solids (SS) reduction efficiency was 20.9 % due to alkaline treatment (pH11) and 14.8 % due to gamma ray irradiation (50 kGy) with a constant TS concentration. The combined alkaline treatment and gamma ray irradiation showed more effective SS reduction and solubilization efficiencies. Both soluble chemical oxygen demand (SCOD) and biochemical oxygen demand (BOD5) increased with increasing pH of WAS from 9.0 to 11.0 and gamma ray from 1 to 50 kGy. The total chemical oxygen demand (TCOD) remained almost constant for various pH and gamma ray doses. Therefore, the SCOD/TCOD ratio showed similar patterns with changes in the SCOD concentration. No BOD5 enhancement was observed with gamma ray doses higher than 20 kGy. The experimental results indicated that the combination of alkaline and gamma ray pretreatment was useful for enhancement of biodegradability.
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