The important implications of particulate substrate in determining the physicochemical characteristics of extracellular polymeric substances (EPS) in activated sludge

Effect of reactor height/diameter ratio and organic loading rate on formation of aerobic granular sludge in sewage treatment

“…It is expected that cell aggregates will carry negative charges due to unbound functional groups. This is consistent with the report by Wang et al (2014), which indicated the negative value in the zeta potential of EPS was mainly due to the ionization of the anionic functional groups such as carboxylic and phosphate. Since cell aggregates have the same charge, there is a repulsive force that inhibits the flocculation process.…”

Enhancement of ZnO particles aggregation and sedimentation using polysaccharide and amino acid: Importance in abiological granular sludge (ABGS) formation

“…However, ZnO particles aggregation in Na 2 SO 4 is still faster than in NaCl/NaF. This phenomenon is contrary to classical DLVO theory but is consistent with other reports [8], which demonstrated that less negatively charged particles did not always result in better aggregation and implied the presence of additional interaction, i.e., hydration repulsion, between particles. After consideration hydration repulsion into DLVO theory (Fig.…”

“…Here, we suppose some extracellular polymeric substances (EPS), such as polysaccharides and amino acids, are potential candidates inspired by their role in BGS formation. Specifically, polysaccharides and amino acids can induce bridging and hydrophobic attraction, respectively, and then promote the formation of granular sludge with dense aggregated structure [8,9]. However, these substances are rarely taken into account in particles aggregation as flocculant, let alone their mixtures.…”

A critical review on characterization strategies of organic matter for wastewater and water treatment processes

“…For instance, an increasing content of ECP helps to enhance the formation and stability of biological flocs (Weber et al, 2007;Wang et al, 2014). Nevertheless, ECP and other polymers in membrane bioreactors are known to be involved in membrane fouling resulting in decreasing permeate flux and increasing transmembrane pressure, and affecting the productivity of membrane filtration systems.…”