The Treatment of Phenolic Wastewater with Immobilized Cells

A bacterium that can biodegrade phenol was isolated from the activated sludge,and immobilized in sodium alginate gel granules with embedding.The optimal immobilization conditions of the bacterium were obtained by the cross-test experiments.The phenol-degradation process showed that the degradation efficiency of immobilized cells is apparently superior to that of free cells for the same strain.When the concentration of phenol is below 1650 mg/L,the phenol in the wastewater could be completely degraded within 48 hours.The optimal temperature of degrading phenol with the immobilized cells is 30～35?℃,and the optimal pH is 6～8.The immobilized cells have good performance on the treatment of phenolic wastewater.The value of COD_(cr) in the wastewater was reduced from 1274 mg/L to 74 mg/L.