@misc{10481/78213,
year = {2022},
month = {6},
url = {https://hdl.handle.net/10481/78213},
abstract = {The degradation of organic matter present in olive mill wastewater (OMW) and the recovery of water were
studied by the integration of catalytic wet peroxidation (CWPO) and direct contact membrane distillation
(DCMD) for the first time. The oxidation step was performed in a fixed–bed reactor (FBR) working in continuous
mode (pH0 = 4.0 ± 0.2, 60 ◦C, Q = 0.75 mL/min, [H2O2]/[COD]feed = 2.3 ± 0.1 g H2O2/g O2). Samples of OMW
diluted by 5– and 7.5–fold were used (OMW–5× and OMW–7.5×, respectively), corresponding to inlet chemical
oxygen demand (COD) values of 3562 ± 68 and 2335 ± 54 mg/L, total phenolic content (TPh) of 177 ± 17 and
143 ± 7 mg GAeq/L, and total organic carbon (TOC) of 1258 ± 63 and 842 ± 45 mg/L, respectively. The FBR
was loaded with 2.0 g of a Fe–activated carbon derived–catalyst, prepared by using olive stones as the precursor,
in line with a circular economy model approach. The catalyst was selected based on the activity and stability
towards polyphenolic synthetic solutions shown in previous works of the team, while actual OMW samples were
used in this work. CWPO–treated samples of OMW allowed the operation of the DCMD unit at higher fluxes than
with the analogous untreated ones, also showing higher rejections of organic matter from the feed solution upon
DCMD, highlighting the beneficial effect of this novel configuration. Using a pre-treated sample of OMW–7.5× as
feed solution (Q = 100 mL/min, Tpermeate ≈ 18 ◦C, Tfeed ≈ 66 ◦C), the produced permeate water stream presented
several parameters well–below the legislated thresholds required for direct discharge for crops irrigation,
including total suspended solids (TSS < 10 mg/L), TPh (<0.01 mg GAeq/L), biochemical oxygen demand (BOD5
< 40 mg/L), and dissolved Fe (<0.06 mg/L). Moreover, the resulting concentrated OMW–retentate streams could
be recirculated to the FBR and maintain the same removal efficiencies obtained previously, despite the increased
initial organic loadings of the retentate after DCMD.},
organization = {Portuguese Foundation for Science and Technology	LA/P/0045/2020	
UIDB/00511/2020	
UIDP/00511/2020},
organization = {European Regional Development Funds (ERDF) through North Portugal Regional Operational Programme (NORTE 2020)	NORTE-01-0145-FEDER000069},
organization = {NORTE 2020 under the PORTUGAL 2020 Partnership Agreement through ERDF	NORTE-01-0145-FEDER000069},
organization = {MCIN/AEI/FEDER "Una manera de hacer Europa"	RTI2018-099224B-I00},
organization = {Portuguese Foundation for Science and Technology	BaseUIDB/50020/2020	
UIDP/50020/2020},
organization = {Portuguese Foundation for Science and Technology},
organization = {European Commission	SFRH/BD/129235/2017},
organization = {National and the European Social Funds through the Human Capital Operational Programme (POCH)		
MCIN/AEI	RYC-2019026634I},
organization = {European Social Found (FSE) "El FSE invierte en tu futuro"	RYC-2019026634I},
publisher = {Elsevier},
keywords = {Fenton},
keywords = {Heterogeneous},
keywords = {Catalyst},
keywords = {DCMD},
keywords = {Fixed-bed reactor},
keywords = {OMW},
title = {Integration of catalytic wet peroxidation and membrane distillation processes for olive mill wastewater treatment and water recovery},
doi = {10.1016/j.cej.2022.137586},
author = {Esteves, Bruno M. and Morales Torres, Sergio and Maldonado Hodar, Francisco José},
}