Influence of dissolved organic matter on the removal of 12 organic micropollutants from wastewater effluent by powdered activated carbon adsorption

WATER RESEARCH

卷:172

Article

Guillossou, Ronan¹  Le Roux, Julien¹  Mailler, Romain²  Pereira-Derome, Caroline Soares¹  Varrault, Gilles¹  Bressy, Adele¹  Vulliet, Emmanuelle³  Morlay, Catherine⁴  Nauleau, Fabrice⁵  Rocher, Vincent²  Gasperi, Johnny^1,6 

[1] Univ Paris Est Creteil, Lab Eau Environm & Syst Urbains, AgroParisTech, Ecole Ponts ParisTech,UMR MA 102, Creteil, France

[2] Serv Publ Lassainissement Francilien SIAAP, Direct Innovat & Environm, Colombes, France

[3] Univ Claude Bernard Lyon 1, MATEIS, INSA Lyon, Univ Lyon,CNRS,UMR 5510, Villeurbanne, France

[4] Univ Claude Bernard Lyon 1, Inst Sci Analyt, CNRS, Univ Lyon,UMR 5510, Villeurbanne, France

[5] Saur, Direct Rech & Developpement, Maurepas, France

[6] French Inst Sci & Technol Transport Dev & Network, Geotech Engn Environm Nat Hazards & Earth Sci Dep, Water & Environm Lab LEE, IRSTV, F-44340 Bouguenais, France

关键词: Wastewater advanced treatment;    Organic micropollutants;    Dissolved organic matter;    Activated carbon adsorption;   

DOI  :  10.1016/j.watres.2020.115487

来源: Elsevier

【 摘 要 】

The presence of dissolved organic matter (DOM) in wastewater effluents is recognized as the main factor limiting the adsorption of organic micropollutants (OMPs) onto activated carbon. The degree of the negative effect that DOM, depending on its quality, exerts on OMPs adsorption is still unclear. The influence of the interactions between DOM and OMPs on their removal is also not fully understood. Adsorption isotherms and conventional batch tests were performed in ultra-pure water and in wastewater effluent to study the influence of DOM on the adsorption of 12 OMPs onto powdered activated carbon. Best fit of adsorption pseudo-isotherms was obtained with the Freundlich equation and showed, as expected, that OMPs adsorption was higher in ultra-pure water than in wastewater effluent due to the presence of DOM leading to pore blockage and competition for adsorption sites. LC-OCD analysis revealed that biopolymers and hydrophobic molecules were the most adsorbed fractions while humic acids were not removed after a contact time of either 30 min or 72 h. The presence of DOM had a negative impact on the removal of all OMPs after 30 min of adsorption, but similar removals to ultra-pure water were obtained for 6 OMPs after 72 h of adsorption. This demonstrated that competition between DOM and OMPs for adsorption sites was not a major mechanism as compared to pore blockage, which only slowed down the adsorption and did not prevent it. The charge of OMPs had a clear impact: the adsorption of negatively charged compounds was reduced in the presence of wastewater effluent due to repulsive electrostatic interactions with the adsorbed DOM and the PAC surface. On the other hand, the removal of positively charged compounds was improved. A 24 h pre-equilibrium between OMPs and DOM improved their removal onto PAC, which suggest that OMPs and DOM interacted in solution which decreased the negative effects caused by the presence of DOM, e.g. through co-adsorption of an OMP-DOM complex. (C) 2020 Elsevier Ltd. All rights reserved.

【 授权许可】

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