PHYSICAL, chemical, and biological properties of activated sludge are influenced by changes in ionic strength and ionic composition of sludge. Many studies have investigated the effects of various cations on sludge characteristics [e.g. 1–6] and concluded that cations, particularly divalent cations, play a crucial role in the formation of flocs, influence floc properties such as size, density, ...

Acidithiobacillus ferrooxidans ILS-2 was adapted in digested sludge and used to treat for dewaterability improvement. Results showed that increasing ferrous iron loading increased dewaterability, but the inoculation of bioleaching strain had little effect on compared controls without strain. The total extracellular polymeric substances (EPS) contents sludges with treatment were similar except a...

In this study, photocatalysis was used to improve the dewaterability and settleability of waste activated sludge (WAS) by a solar photocatalytic reactor with transparent Ag/TiO2 film as photocatalyst. Specific resistance of filtration (SRF) and sludge volume index (SVI) were used to evaluate WAS dewaterability and settleability, respectively, and the mechanism of photocatalysis was interpreted ...

Bench- and pilot-scale successive multi-batch trials were conducted to investigate the performance sustainability of fungal conditioning with Penicillium simplicissimum NJ12 for improving sludge dewatering. The dominant factors affecting dewaterability improvement by P. also identified. Fungal treatment at a volume fraction 5% inoculum greatly improved dewaterability. This was characterized sha...

Cationic polyacrylamides have been employed widely to improve sludge dewatering performance, but the cationic units are randomly distributed in the molecular chain, which restricts the further enhancement of dewaterability. Common template technology to prepare block copolymers requiring a huge number of templates reduces the polymer purity and molecular weight. Here, we adopted the surface-act...

Anaerobic digestion (AD) technology is commonly used to treat sewage sludge from activated systems, meanwhile alleviating the energy demand (and costs) for wastewater treatment. Most often, anaerobic run in single-stage systems under mesophilic conditions, as this temperature regime considered be more stable than thermophilic one. However, it known that conditions are advantageous over ones ter...

Conditioning of an aluminum-based water treatment sludge by single and dual polymers was investigated in this study. Capillary suction time (CST), specific resistance to filtration (SRF) and settling rate were used to evaluate the sludge dewatering characteristics. Sludge dewaterability resulting from single and dual polymer conditioning were compared for the purpose of exploring the validity a...