Abstract
The activated sludge was entrapped in acrylamide gel, and elastic pellets containing activated sludge were obtained. The pellets were dried and preserved at a room temperature. After 14 days, the volume of the pellets had shrank by 38%, and after 30 days, by 12%. After restoration in wastewater, the pellets swelled to their original size. During preservation periods of up to 30 days, 51% of respiratory activity remained. With the pellet preserved for 30 days, synthetic wastewater of 300 mg-BOD·l-1 was treated at a high loading rate of 1 kg-BOD·m-3·d-1. BOD concentration of the effluent could be reduced to 20 mg·l-1 or less, and the removal was 95%.
