Abstract
A large quantity of excess sludge is produced during the sewage treatment process, which will cause serious environmental problem without being treated properly. In this paper, a new multi-enzyme was added in the excess sludge to enhance the sludge hydrolysis and reduction, and the treatment conditions of hydrolysis time, dosage, hydrolysis temperature with multi-enzymes was optimized in this study. The multi-enzymes could promote the solubilization of suspended sludge solids and the degradation of macromolecular organic matter. The effect of excess sludge digestion was enhanced significantly at the condition of 30 °C, 1.5 mL multi-enzyme after 5 h hydrolysis for per 100 mL excess sludge. And the optimal hydrolysis conditions were determined by detecting the concentration of carbohydrate, soluble protein, SCOD and sludge’s lysis rates, and the effect of sludge reduction was investigatied by the VSS solubility.
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