Physical and chemical properties of activated sludge floc

Andreadakis, A.

doi:10.1016/0043-1354(93)90107-s

Cited by 188 publications

(75 citation statements)

References 19 publications

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“…The biomass consortia of about several hundred micrometres (common size of activated sludge flocs) are in a relatively similar range -from 40 to 350 m 2 /g of specific surface, e.g. Smith and Coackley (1983) reported 40-140 m 2 /g, Andreadakis (1993) -from 100 to 200 m 2 /g and Bishop et al (1995) noted the widest range: 80-350 m 2 /g dry solids.…”

Section: Ammonium Nitrogen and Phosphorus Removal Efficiencymentioning

confidence: 99%

Effect of thickness of textile filter on organic compounds and nutrients removal efficiency at changeable wastewater surface level

Spychała

Lucyk²

2015

Nauka Przyr. Technol.

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Summary. The aim of the study was to identify the innovative filters' (textile filters for wastewater treatment) thickness impact on dissolved compounds removal efficiency and related: biomass concentration, hydraulic capacity and hydraulic retention time. The study was conducted on septic tank effluent (STE) which was filtered at changeable wastewater surface between 7 cm and 20 cm of height under hydrostatic pressure. The research was performed on filters of thickness: 1.8 mm, 3.6 mm and 7.2 mm. The thinner the filter layer, the lower the total solids content and the higher the hydraulic capacity. The thicker the filter layer, the higher the dissolved compounds removal efficiency. The most efficient in removal were the thickest (eight-layers) filters. The calculated hydraulic retention times were: 0.5, 1.1 and 3.3 h for two-, four-and eight-layer filters, respectively.

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Section: Ammonium Nitrogen and Phosphorus Removal Efficiencymentioning

confidence: 99%

Effect of thickness of textile filter on organic compounds and nutrients removal efficiency at changeable wastewater surface level

Spychała

Lucyk²

2015

Nauka Przyr. Technol.

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“…Karapinar and Kargi (1996) studied the effect of particle number density on wastewater treatment performance of a fluidized-bed bioreactor. PSD analysis has also been applied into the activated sludge process to investigate the sludge floc properties (Andreadakis 1993;Barbusinski and Koscielniak 1995;Wilen and Balmer, 1999;Biggs and Lant, 2000;Chaignon et al, 2002;Harikumar et al, 2009). PSD could also be used in the membrane bio-reactor (MBR) studies due to its direct impact on membrane fouling (Shimizu et al, 1997;Wisniewski et al, 2000;Lim and Bai 2003;Stoller 2009).…”

Section: Introductionmentioning

confidence: 99%

Experimental and modeling investigation of sewage solids sedimentation based on particle size distribution and fractal dimension

2009

Int. J. Environ. Sci. Technol.

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Sewage solids are usually characterized by non-specific parameters such as suspended solids. The suspended solids has been shown to be an inadequate index for advanced water treatment processes. In this study, the sewages solids particle size distribution was used to provide more detailed information on sewage characteristic. It is hoped that, by introducing particle size distribution, the mechanism of sewage solids sedimentations can be better understood. The particle size distribution of the domestic sewage was measured by the Malvern® laser scattering technique to link to its settlement efficiency. Experimental results show that 77 % of particle volume was removed during the 90 min settling, of which 71.2 % of particle volume was removed in the initial 30 min. The submicron particles were found to be removed by co-settling with large particles. The fractal dimensions of sewage solids could also be derived from the laser scattering measurement. The fractal dimension could also provide useful information on the shape and density of sewage solids. A mathematical model considering the particle sizes, shapes and density changes was then constructed to simulate the settlement of raw sewage particles. Comparison of the modeling results based on discrete and flocculant settling theory shows that settlement can be better predicted by considering the fractal nature of particles. The particle size distribution and fractal dimension data measured by Malvern® laser scattering technique have been shown to be valuable data for in-depth understanding of the mechanisms of sewage solids sedimentation.

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“…It has also been reported for heavy metals (Yeoman et al, 1989;Yeoman et al, 1992) and organic dyes (Andreadakis, 1993) that ratios of contaminants to particle mass were not increased in the small size fractions. If the association process would mainly be a solid surface adsorption type process a stronger association to smaller particles would be observed because of their larger specific surface.…”

Section: Association Of Chemical Oxygen Demand (Cod) and Phosphorus (mentioning

confidence: 87%

Particle size analysis for improved sedimentation and filtration in waste water treatment

1999

Water Science and Technology

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Size distributions of particle mass, chemical oxygen demand (COD) and phosphorus at four municipal waste water treatment plants were investigated by fractionation of samples through 0.1-8.0 µm polycarbonate filters and 32-125 µm sieves, respectively. Particle size analysis of primary and secondary effluents at each plant showed significantly different size distribution functions. These distribution functions remained constant with respect to time under dry weather conditions so they can be considered as characteristical patterns for each sample location. Advanced treatment by deep bed filtration can be improved by taking into consideration the distribution pattern in the secondary effluents. In raw sewage and primary effluents 45-90% of COD and 35-80% of phosphorus were associated with suspended solids. In the secondary effluents particulate COD drops to 14-45% but particulate phosphorus increases to 55-80%. Conclusions are drawn for a better design of advanced contaminant reduction in connection with suspended solids removal processes.

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Physical and chemical properties of activated sludge floc

Cited by 188 publications

References 19 publications

Effect of thickness of textile filter on organic compounds and nutrients removal efficiency at changeable wastewater surface level

Effect of thickness of textile filter on organic compounds and nutrients removal efficiency at changeable wastewater surface level

Experimental and modeling investigation of sewage solids sedimentation based on particle size distribution and fractal dimension

Particle size analysis for improved sedimentation and filtration in waste water treatment

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