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.

Do inorganic coagulants improve sludge dewaterability?

Niu et al. evaluated the effects of PAC, high-performance PAC and FeCl 3 inorganic coagulants on sludge dewaterability, and found that the inorganic coagulants significantly enhance the dewatering performance of sludge through charge neutralization and double electric layer compression.

Can FECL 3 make small sludge particles?

FeCl 3, quick lime, and cationic polyacrylamide (CPAM) were used for excess sludge conditioning from wastewater treatment plant (WWTP) and the dewatering performance by different chemical conditioners was investigated. Experimental results showed that FeCl 3 could make small and concentrated sludge particles.

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.

Can sludge-based carbon improve coagulation and flocculation dewaterability?

A novel sludge conditioning method incorporating sludge-based carbon (SBC) as a filter aid into the coagulation and flocculation co-conditioning process is proposed to strengthen sludge dewaterability, namely the co-conditioning of polyaluminum chloride (PAC)-SBC-polyacrylamide (PAM).

Do extracellular polymeric substances affect sludge dewatering performance?

Current studies show that extracellular polymeric substances (EPS) provide an important contribution to maintain water in sludge (Jin et al. 2004; He et al. 2017). Therefore, EPS are considered a significant factor that affects sludge dewatering performance. Maintaining high pressure alone cannot obtain good deep dewatering performance.