Nonoxidative removal of organics in the activated sludge process
Journal article, 2016

The activated sludge process is commonly used to treat wastewater by aerobic oxidation of organic pollutants into carbon dioxide and water. However, several nonoxidative mechanisms can also contribute to removal of organics. Sorption onto activated sludge can remove a large fraction of the colloidal and particulate wastewater organics. Intracellular storage of, e.g., polyhydroxyalkanoates (PHA), triacylglycerides (TAG), or wax esters can convert wastewater organics into precursors for high-value products. Recently, several environmental, economic, and technological drivers have stimulated research on nonoxidative removal of organics for wastewater treatment. In this paper, we review these nonoxidative removal mechanisms as well as the existing and emerging process configurations that make use of them for wastewater treatment. Better utilization of nonoxidative processes in activated sludge could reduce the wasteful aerobic oxidation of organic compounds and lead to more resource-efficient wastewater treatment plants.

chemical oxygen-demand

particle-size

different operational modes

mixed

biological phosphorus removal

poly-beta-hydroxybutyrate

distribution

high-rate activated sludge

DLVO theory

polyhydroxyalkanoate

waste-water treatment

extracellular polymeric substances

triacylglyceride

colloids

contact-stabilization

polyhydroxyalkanoate pha production

in-situ transesterification

microbial cultures

Adsorption

Author

Oskar Modin

Chalmers, Civil and Environmental Engineering, Water Environment Technology

Frank Persson

Chalmers, Civil and Environmental Engineering, Water Environment Technology

Britt-Marie Wilen

Chalmers, Civil and Environmental Engineering, Water Environment Technology

Malte Hermansson

University of Gothenburg

Critical Reviews in Environmental Science and Technology

1064-3389 (ISSN)

Vol. 46 7 635-672

Driving Forces

Sustainable development

Subject Categories

Water Engineering

Environmental Sciences

Areas of Advance

Energy

DOI

10.1080/10643389.2016.1149903

More information

Created

10/7/2017