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.

Are cationic polyacrylamide copolymers used for sludge dewatering?

Environmental Sciences Europe 30, Article number: 16 (2018) Cite this article Cationic polyacrylamide copolymers (PAMs) are used for sludge dewatering in municipal waste water treatment and might enter the environment by spreading of the sludge on agricultural land.

What is the microstructure of sludge conditioned with Pam alone?

Fig. 7 a3 illustrates the microstructure of sludge conditioned with PAM alone, which appears significantly agglomerated and produces pores, providing a channel to discharge water and increasing dewatering capability.

Does Pam increase sludge particle size?

Fig. 4 b Shows PSD of sludge samples with PAM added, it can be seen that the sludge particle size increases with the increase of PAM dose and reaches the maximum value at 1.5 mg g −1 MLSS, then too much dose leads to smaller particle size.

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.

What is the role of lb-EPs in sludge dewatering?

LB-EPS played an important role in sludge dewatering, reaching the lowest protein content with PAC alone at 20 mg g −1 MLSS, PAM alone at 1.5 mg g −1 MLSS, and combined PAC concentration of 15 mg g −1 MLSS and PAM concentration of 1 mg g −1 MLSS.