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Sorption and Release of Organics by Primary, Anaerobic, and Aerobic Activated Sludge Mixed with Raw Municipal Wastewater

Oskar Modin (Institutionen för bygg- och miljöteknik, Vatten Miljö Teknik) ; Soroush Saheb Alam (Institutionen för bygg- och miljöteknik, Vatten Miljö Teknik) ; Frank Persson (Institutionen för bygg- och miljöteknik, Vatten Miljö Teknik) ; Britt-Marie Wilén (Institutionen för bygg- och miljöteknik, Vatten Miljö Teknik)
PLoS ONE (1932-6203). Vol. 10 (2015), 3, p. e0119371.
[Artikel, refereegranskad vetenskaplig]

New activated sludge processes that utilize sorption as a major mechanism for organics removal are being developed to maximize energy recovery from wastewater organics, or as enhanced primary treatment technologies. To model and optimize sorption-based activated sludge processes, further knowledge about sorption of organics onto sludge is needed. This study compared primary-, anaerobic-, and aerobic activated sludge as sorbents, determined sorption capacity and kinetics, and investigated some characteristics of the organics being sorbed. Batch sorption assays were carried out without aeration at a mixing velocity of 200 rpm. Only aerobic activated sludge showed net sorption of organics. Sorption of dissolved organics occurred by a near-instantaneous sorption event followed by a slower process that obeyed 1st order kinetics. Sorption of particulates also followed 1st order kinetics but there was no instantaneous sorption event; instead there was a release of particles upon mixing. The 5-min sorption capacity of activated sludge was 6.5±10.8 mg total organic carbon (TOC) per g volatile suspend solids (VSS) for particulate organics and 5.0±4.7 mgTOC/gVSS for dissolved organics. The observed instantaneous sorption appeared to be mainly due to organics larger than 20 kDa in size being sorbed, although molecules with a size of about 200 Da with strong UV absorbance at 215–230 nm were also rapidly removed.



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Denna post skapades 2015-03-23. Senast ändrad 2016-02-01.
CPL Pubid: 214193

 

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