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J Environ Manage. 2017 Jul 15;197:490-497. doi: 10.1016/j.jenvman.2017.04.011. Epub 2017 Apr 14.

Adsorption of organic stormwater pollutants onto activated carbon from sewage sludge.

Author information

1
Department of Civil Engineering, University of British Columbia, 6250 Applied Science Lane, Vancouver, B.C, V6T 1Z4, Canada; Department of Civil and Environmental Engineering, Chalmers University of Technology, Sven Hultins Gata 8, 41296 Göteborg, Sweden. Electronic address: karin.bjorklund@chalmers.se.
2
Department of Civil Engineering, University of British Columbia, 6250 Applied Science Lane, Vancouver, B.C, V6T 1Z4, Canada.

Abstract

Adsorption filters have the potential to retain suspended pollutants physically, as well as attracting and chemically attaching dissolved compounds onto the adsorbent. This study investigated the adsorption of eight hydrophobic organic compounds (HOCs) frequently detected in stormwater - including four polycyclic aromatic hydrocarbons (PAHs), two phthalates and two alkylphenols - onto activated carbon produced from domestic sewage sludge. Adsorption was studied using batch tests. Kinetic studies indicated that bulk adsorption of HOCs occurred within 10 min. Sludge-based activated carbon (SBAC) was as efficient as tested commercial carbons for adsorbing HOCs; adsorption capacities ranged from 70 to 2800 μg/g (Cinitial = 10-300 μg/L; 15 mg SBAC in 150 mL solution; 24 h contact time) for each HOC. In the batch tests, the adsorption capacity was generally negatively correlated to the compounds' hydrophobicity (log Kow) and positively associated with decreasing molecule size, suggesting that molecular sieving limited adsorption. However, in repeated adsorption tests, where competition between HOCs was more likely to occur, adsorbed pollutant loads exhibited strong positive correlation with log Kow. Sewage sludge as a carbon source for activated carbon has great potential as a sustainable alternative for sludge waste management practices and production of a high-capacity adsorption material.

KEYWORDS:

Adsorption; Organic contaminants; Sludge-based activated carbon; Stormwater management

PMID:
28412620
DOI:
10.1016/j.jenvman.2017.04.011
[Indexed for MEDLINE]

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