However, its use requires a very good biomass settleability.

Measurements of exopolysaccharides could be used to characterize sludge settleability.

Surface properties of sludge and their role in bioflocculation and settleability.

They also measured settleability and found the ground waste would be carried/resuspended easily in conventionally designed sewers.

Results suggest that a greater proportion of ferric iron in the raw water enhances sludge density and settleability.

Biomass settleability is linked to the extracellular polymers that are the third component of the sludge flocs, after the cells and the water.

The settleability of the sludge was extremely fast, 12 m/h, as compared to 4 m/h observed with most sludges.

An elutriation apparatus for assessing settleability of combined sewer overflows (CSOs).

This can cause the dissolved oxygen content to drop; this may reduce the efficiency of nitrification and the settleability of the sludge.

The final effluent quality, lime consumption, sludge density, settleability, filterability, viscosity, neutralization potential, metal leachability, and operating and capital costs will be evaluated for each process.

Keywords: Wastewater treatment, activated sludge, settleability, cyclic feeding, high biomass concentration, high strength wastewater Source: Rev.

Filamentous microorganisms were present in the biomass at all C:N:P ratios, but the lower P levels did not influence filament abundance, and hence never affected settleability.

The evidence on the effect of pit additives on settleability of solids and reduction in effluent BOD and suspended solids is mixed.

Generally, the products of the HDS process also contain gypsum and unreacted lime, which enhance both its settleability and resistance to re-acidification and metal mobilization.

Settleability of the samples was assessed by four methods, including three settling column-based methods and a newly proposed Elutriation Apparatus Method (EAM).

Overall, the temperature transients correlated to an increase in filament abundance, poor sludge settleability, a more negatively charged sludge, and a clear decrease in the activity/presence of protozoa and metazoa.

For the effective design of a treatment process for CSOs, it is necessary to first understand the CSO characteristics with respect to chemical composition and settleability, with and without chemical additions.

A too low level of exopolysaccharides indicates a sludge defloculation problem, whereas a too high level of exopolysaccharides means that sludge settleability could be hindered because of an excessive growth of filamentous organisms.

On the other hand, the separation ability of the clarifier depends on the hydraulic configuration of the aerated reactor: biomass settleability can be controlled by completely stirred reactors in series, plug-flow reactors or intermittently-fed systems.