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Effects of floc aluminum on activated sludge characteristics and removal of 17-α-ethinylestradiol in wastewater systems

TitleEffects of floc aluminum on activated sludge characteristics and removal of 17-α-ethinylestradiol in wastewater systems
Publication TypeJournal Article
Year of Publication2009
AuthorsPark C, Fang Y, Murthy S, Novak JT
JournalWater Research
Volume44
Issue5
Start Page1335
Pagination1335-1340
Date Published11/2009
Keywordsactivated sludge, Aluminum, Bioflocculation, Colloids, EDC, EE2, Effluent, Proteins, Solids
Abstract

The effects of floc aluminum (Al) on activated sludge performance and 17-alpha-ethinylestradiol (EE2) removal were studied using bench-scale activated sludge systems. The results showed that higher Al-fed activated sludge led to better settling, dewatering, and effluent quality with better EE2 removal. EE2 concentrations in the effluent revealed correlations with effluent suspended solids and large particulate/colloidal effluent biopolymer (protein+polysaccharide). Furthermore, a significant correlation existed between effluent proteins and EE2 for all size fractions, indicating that hydrophobic proteinaceous colloids provide binding sites for EE2 and washout together into the effluent. These results suggest that aluminum plays a crucial role in bioflocculation of activated sludge and the efficacy of flocculation influences the removal of endocrine disrupting compounds (EDCs) from wastewater treatment systems.

DOI10.1016/j.watres.2009.11.002