Abstract
In this research, the coagulants mass ratio affecting the moisture content of acrylic sludge cake was studied. The effects of APAM, CPAM and PAC mass ratio on the moisture content of pressure filter cake and the specific resistance of sludge were studied by orthogonal experiment. The results showed that the specific resistance of sludge presented a highly positive correlation with the moisture content of the filter cake after the treatment of acrylic sludge with CPAM, APAM and PAC. The multivariate regression model for moisture content of the filter cake with coagulants mass ratio was established by response surface methodology. And the model was accurate and reliable in the experimental range which could predict the relationship between the moisture content of the filter cake and the coagulants. In addition, the order of coagulants influencing the moisture content of the filter cake was: CPAM> PAC> APAM. The optimal mass ratio of coagulants to sludge content were 1.5 %„ (APAM), 1 %0 (CPAM) and 1.9 %0 (PAC); the moisture content of the filter cake was 46.45%; and the specific resistance of sludge was 9.65 × 10-7s2 / cm. The study about the effects of coagulants addition order on dewatering performance indicated that the optimal order was PAC-CPAM-APAM. This work could provide a theoretical basis for the design and optimal control of acrylic sludge.
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