Publication Type Journal Article
Title Engineered pine nut shell derived activated carbons for improved removal of recalcitrant pharmaceuticals in urban wastewater treatment
Authors Ana S. Mestre Rui M. C. Viegas Elsa Mesquita Maria Joao Rosa Ana P. Carvalho
Groups Chem4Env
Journal JOURNAL OF HAZARDOUS MATERIALS
Year 2022
Month
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Volume 437
Number
Pages
Abstract Novel powdered activated carbons (PACs) from pine cones and pine nut shells (PNSs) were tested for the competitive adsorption of pharmaceutical compounds (PhCs) in spiked (100 mu g/L) secondary effluent and mixed liquor from an urban wastewater treatment plant. Steam activated PNS77, with hierarchical pore structure and 1463 m(2)/g of BET area, outperformed the commercial benchmark (WP220, mineral origin) for PhCs and dissolved organic matter (DOM) control. PNS77 attained the highest adsorption capacity and rate in synthetic and real wastewaters. Competitive adsorption isotherms revealed the detrimental effect of direct site competing DOM on PhC removal. The PhCs adsorbability increased with their hydrophobicity, regardless of the water matrix. Kinetic data allowed inferring that indirect competition due to pore constriction/blockage appeared to occur only in mixed liquor. Adsorption isotherm data modelling for ng/L range revealed 80 \% removal of carbamazepine and diclofenac would be achieved dosing 8-15 mg/L PNS77 to secondary effluent, while for mixed liquor the dose must be doubled to balance the increased competition. Hydrophilic sulfamethoxazole required a higher dose (34-44 mg/L), lower in the mixed liquor. PNS77 hierarchical pore network and basic surface chemistry minimized DOM direct site competition, requiring lower doses in practical applications for wastewater treatment.
DOI http://dx.doi.org/10.1016/j.jhazmat.2022.129319
ISBN
Publisher ELSEVIER
Book Title
ISSN 0304-3894
EISSN 1873-3336
Conference Name
Bibtex ID WOS:000833539600002
Observations
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