Nevertheless, during subsequent cycles, the settling ability of biomass gradually improved because of high assimilation of substrate by a mixed culture of bacteria in both reactors.
The result of analysis from this control batch determines the inherent (natural) settling ability of the wastewater i.e. the results from this batch acts as a baseline with respect to which the flocculation efficacy of the grafted copolymers were determined.
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Granular sludge from SBR has more compact structure and excellent settling ability.
Sludge volumetric index is an important parameter in activated sludge to evaluate the settling ability of the flocs.
The SVI of AGS decreased to 57.5, 48.4, 49.7, and 50.3 mL/g at the 8th day; then, it was maintained at a low level indicating their excellent settling ability.
Compared to an anaerobic/oxic plug flow (A/O) reactor and an oxidation ditch (OD) being operated in this wastewater treatment plant, the sludge from full-scale SBR has more compact structure and excellent settling ability.
Aerobic granular sludge is formed by microbial self-aggregation and has advantages such as excellent settling ability, dense and strong microbial structure, high biomass retention, ability to withstand a high organic loading rate and tolerance to toxicity compared with conventional activated sludge [ 4– 7].
Furthermore, a short settling time favored the growth of rapidly-settling bioparticles whereas the bioparticles with a poor settling ability were washed out [ 12].
Compared with the control reactor receiving no TCE, biomass in the TCE-fed reactors had lower phenol-dependent specific oxygen utilization rate, but higher concentration, bigger size, and better settling ability.
Granules in the full-scale SBR showed the best settling ability and the highest settling velocity among these three processes after granulation (Table 2).
