Adsorption of organic stormwater pollutants onto activated carbon from sewage sludge

JOURNAL OF ENVIRONMENTAL MANAGEMENT

卷:197

Article

Bjorklund, Karin^1,2  Li, Loretta Y.¹ 

[1] Univ British Columbia, Dept Civil Engn, 6250 Appl Sci Lane, Vancouver, BC V6T 1Z4, Canada

[2] Chalmers Univ Technol, Dept Civil & Environm Engn, Sven Hultins Gata 8, S-41296 Gothenburg, Sweden

关键词: Adsorption;    Organic contaminants;    Sludge-based activated carbon;    Stormwater management;   

DOI  :  10.1016/j.jenvman.2017.04.011

来源: Elsevier

【 摘 要 】

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 mu g/g (C-initial = 10-300 mu g/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' hydro-phobicity (log K-ow) 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 K-ow. 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. (C) 2017 Elsevier Ltd. All rights reserved.

【 授权许可】

Free