Specific adsorbents for the treatment of OMW phenolic compounds by activation of bio-residues from the olive oil industry
Metadata
Show full item recordEditorial
Elsevier
Materia
Active carbon Biosorbent Phenolic acid Wastewater treatment Adsorption Olive mill wastewater
Date
2022-01-18Referencia bibliográfica
Bruno M. Esteves... [et al.]. Specific adsorbents for the treatment of OMW phenolic compounds by activation of bio-residues from the olive oil industry, Journal of Environmental Management, Volume 306, 2022, 114490, ISSN 0301-4797, [https://doi.org/10.1016/j.jenvman.2022.114490]
Sponsorship
Portuguese Foundation for Science and Technology UIDB/00511/2020; European Regional Development Funds (ERDF) through North Portugal Regional Operational Programme (NORTE 2020) NORTE-01-0247-FEDER-39789; Project "HealthyWaters -Identification, Elimination, Social Awareness and Education of Water Chemical and Biological Micropollutants with Health and Environmental Implications" - NORTE 2020, under the PORTUGAL; 2020 Partnership Agreement NORTE-01-0145-FEDER-000069; MCIN/AEI/FEDER "Una manera de hacer Europa" RTI2018-099224-B-I00; Portuguese Foundation for Science and Technology; European Commission SFRH/BD/129235/2017; National Fund through the Human Capital Operational Programme (POCH); European Social Fund through the Human Capital Operational Programme (POCH) MCIN/AEI RYC-2019-026634I; European Social Found (FSE) "El FSE invierte en tu futuro" RYC-2019-026634I; Universidad de Granada/CBUAAbstract
A series of adsorbents was developed by physical (CO2) and chemical (KOH) activation of two bio-residues: olive stones (OS) and wood from olive tree pruning (OTP). The physicochemical properties of such materials were determined and correlated with their adsorptive performance in the removal of phenolic compounds of olive mill wastewater (OMW). Adsorption isotherms and kinetics of single phenolic acids, as well as the kinetics for competitive multi-compound adsorption, were fitted by applying different models, though Langmuir and pseudosecond order models fitted better the experimental results, respectively. The intraparticle diffusion model pointed out that mesoporosity reduces the influence of phenolic compounds' restrictions in the external film diffusion of the adsorbent particle-solution interphase, but adsorption capacity linearly increases with the micropore volume accessible to N-2 at -196 degrees C (and also with BET surface area), while diffusion into ultramicropores (<0.7 nm, determined by CO2-adsorption) is slow and presents minor influence on the total adsorption capacity. After saturation, thermal regeneration of spent adsorbents allows the removal of adsorbed products, enabling the reuse of samples whilst maintaining a significant performance.