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Evaluation of low-cost materials for sorption of hydrophobic organic pollutants in stormwater

Karin Björklund (Institutionen för bygg- och miljöteknik, Vatten Miljö Teknik) ; L. Li
Journal of Environmental Management (0301-4797). Vol. 159 (2015), p. 106-114.
[Artikel, refereegranskad vetenskaplig]

Conventional stormwater treatment techniques such as sedimentation and filtration are inefficient for removing the dissolved and colloidal phases of hydrophobic organic compounds (HOCs) present in stormwater. Adsorption could be a promising technique for removing colloidal and dissolved pollutants. Five low-cost sorbent materials were investigated in this project, including two minerals - vermiculite and perlite - and three waste products - two pine barks and a sawdust - as potential adsorbents for removal of polycyclic aromatic hydrocarbons (PAHs), alkylphenols and phthalates; HOCs commonly found in stormwater. Adsorption capacity and kinetics were studied through batch adsorption tests using synthetic stormwater spiked with a mixture of HOCs. Vermiculite and perlite exhibited insignificant removal of the organic contaminants. The three wood-based materials retained >80% of the initial HOC concentration (10-300μg/L). The two barks exhibited slightly higher adsorption capacities of HOCs than the sawdust. For all compounds tested, maximum adsorption onto the wood-based media was reached in <10min. The highest adsorption capacity was found for PAHs (up to 45μg/g), followed by alkylphenols and phthalates. No correlation was found between adsorption capacity and physical-chemical parameters such as solubility and partition coefficients (log Kow). Agreement between empirical data and the pseudo-second order kinetic model suggest chemisorption of HOCs onto a monolayer on wood-based media. This could lead to early saturation of the materials and should be investigated in future studies through repeated adsorption of HOCs, for example in column studies.

Nyckelord: Adsorption filter , Alkylphenols , PAHs , Phthalates , Pine bark , Stormwater management

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Denna post skapades 2015-07-27. Senast ändrad 2016-11-21.
CPL Pubid: 219991


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Institutionen för bygg- och miljöteknik, Vatten Miljö Teknik (2005-2017)


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