Does polymeric aluminum chloride and polyacrylamide dewater sludge?

Sludge dewatering is governed by chemical potential gap depicted by Flory-Huggins theory. Thermodynamic mechanisms of sludge dewatering by chemical conditioning was revealed. This study investigated the combined effects of polymeric aluminum chloride (PAC) and polyacrylamide (PAM) on sludge dewatering, aiming to unveil underlying mechanisms.

Does hydroxyaluminum affect sludge dewatering performance?

Chemical conditioning emerges as a pivotal determinant in augmenting sludge dewatering performance. In the realm of frequently employed aluminum chloride polymer conditioners, the impact of hydroxyaluminum is noteworthy. Beyond influencing dewatering efficacy, it introduces chloride ions, precipitating a cascade of subsequent treatment challenges.

Does polymeric aluminum improve sludge dewatering performance?

Medium polymeric aluminum demonstrated enhanced stability and a notable positive charge, culminating in the optimal enhancement of sludge dewatering performance. Chloride ion content in sludge exhibited a linear increase with rising flocculant dosage, primarily attributed to PAC dosage.

Does chemical conditioning enhance sludge dewatering performance?

Medium polymeric aluminum significantly enhanced sludge dewatering. Investigated the migration of chloride ions during the conditioning process. Lime coagulant effectively reduced chloride ions in sludge cake. Chemical conditioning emerges as a pivotal determinant in augmenting sludge dewatering performance.

Does polysaccharide sludge affect dewatering performance?

Similarly, a higher polysaccharide content in the raw sludge indicates lower dewatering performance ( Li et al., 2012 ). To address this issue, PAM is added to act as a netting and sweeping agent. It adsorbs negatively charged colloidal particles and collects and nets fine particles in the water.

Does sludge dewatering affect chloride migration among different coagulants?

For the comparison of chloride migration among different coagulants, it was employed SPSS software to perform linear regression fitting to examine the relationship between PAC dosage, the concentration difference ratio of chloride ions in sludge dewatering, and the variation of chloride ions in the sludge cake.