TY - JOUR
T1 - Optimization of hybrid treatment of olive mill wastewaters through impregnation onto raw cypress sawdust and electrocoagulation
AU - Bargaoui, Malika
AU - Jellali, Salah
AU - Azzaz, Ahmed Amine
AU - Jeguirim, Mejdi
AU - Akrout, Hanene
N1 - Funding Information:
The authors would like to thank Helmi Hamdi for his diligent proofreading of this paper.
Funding Information:
This work was funded by the Tunisian Ministry of Higher Education and Scientific Research (MHESR) and FERTICHAR project. FERTICHAR is funded through the ARIMNet2 (2017) Joint Call by the following funding agencies: ANR (France), MHESR (Tunisia) and HAO-DEMETER (Greece). ARIMNet2 (ERA-NET) has received funding from the European Union’s Seventh Framework Programme for research, technological development, and demonstration under grant agreement no. 618127. Acknowledgments
Publisher Copyright:
© 2020, Springer-Verlag GmbH Germany, part of Springer Nature.
PY - 2021/5
Y1 - 2021/5
N2 - This research investigation proposes a new method for sustainable olive mill wastewater (OMW) treatment and handling. It is based on the combination of its impregnation onto raw cypress sawdust (RCS) followed by electrocoagulation. The retention of OMW compounds onto various RCS doses show an important decrease of its chemical oxygen demand (COD) and its main cation and anion content. The maximum retention efficiencies of COD, Na+, K+, Ca2+, Mg2+, Cl−, PO43−, and SO42− were about 51.0%, 75.3%, 28.7%, 77.9%, 84.7%, 41.1%, 98.3%, and 90.9%, respectively, for the highest RCS dose (200 g L−1). This organic matter- and nutrient-loaded biomass could be thermochemically converted through pyrolysis into biofuel and biochar for energetic and agronomic purposes, respectively. The treatment by electrocoagulation of the pre-treated OMW using mild steel electrodes could be considered an attractive treatment method since 75.6% of COD removal efficiency was achieved. Besides, this approach permits a significant energy consumption reduction by 46% as compared with the electrocoagulation process alone. It allows also a significant improvement of the treated effluent quality in terms of both organic and mineral contents that could be reused for the irrigation of olive trees in the context of circular economy.
AB - This research investigation proposes a new method for sustainable olive mill wastewater (OMW) treatment and handling. It is based on the combination of its impregnation onto raw cypress sawdust (RCS) followed by electrocoagulation. The retention of OMW compounds onto various RCS doses show an important decrease of its chemical oxygen demand (COD) and its main cation and anion content. The maximum retention efficiencies of COD, Na+, K+, Ca2+, Mg2+, Cl−, PO43−, and SO42− were about 51.0%, 75.3%, 28.7%, 77.9%, 84.7%, 41.1%, 98.3%, and 90.9%, respectively, for the highest RCS dose (200 g L−1). This organic matter- and nutrient-loaded biomass could be thermochemically converted through pyrolysis into biofuel and biochar for energetic and agronomic purposes, respectively. The treatment by electrocoagulation of the pre-treated OMW using mild steel electrodes could be considered an attractive treatment method since 75.6% of COD removal efficiency was achieved. Besides, this approach permits a significant energy consumption reduction by 46% as compared with the electrocoagulation process alone. It allows also a significant improvement of the treated effluent quality in terms of both organic and mineral contents that could be reused for the irrigation of olive trees in the context of circular economy.
KW - Adsorption
KW - Advanced oxidation process
KW - Hybrid treatment
KW - Nutrients
KW - Olive mill wastewater
KW - Organic matter
KW - Sustainability
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U2 - 10.1007/s11356-020-08907-w
DO - 10.1007/s11356-020-08907-w
M3 - Article
C2 - 32337671
AN - SCOPUS:85084149907
SN - 0944-1344
VL - 28
SP - 24470
EP - 24485
JO - Environmental Science and Pollution Research
JF - Environmental Science and Pollution Research
IS - 19
ER -