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Sequencing batch reactor efficiency to reduce pollutant in olive oil mill wastewater mixed with urban wastewater

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Abstract

The production of olive oil mill wastewater is one of the leading environmental sustainability problems in the food sector industries. The constituents of OMW effluents are often complex. They require a high level of energy and treatment to reduce their pollution. This work investigated a sequential batch reactor (SBR) capacity evaluation to treat OMW diluted by domestic wastewater. Two systems have been examined. Two different dilutions of OMW with wastewater are made such as M1 (50% OMW 50% wastewater) and M2 (75% OMW 25% wastewater). M1 dilution improved biodegradability and reduced pollution of OMW. Both systems were operated continuously on a 24-h cycle. Each reactor's performance in removing COD, polyphenols, ammonium, nitrate, and phosphorus was monitored throughout the experiment. SBR M1 showed reduction rate of 68.9, 67.1, 75.3, 86 and 95.3% for COD, polyphenols, nitrates, ammonium and phosphorus, respectively. Whereas SBR M2 removed 40.2% of COD, 47% of polyphenols, 61.2% of nitrates, 61.1% of ammonium, and 94.1% of phosphorus. The suggested treatment process could be used in the olive oil manufacturing industries as a simple and inexpensive technique. The principal component analysis application shows that almost all the variance is represented by the first component for both mixtures, with a positive correlation between pH and concentrations of ammonium, polyphenols, and the first mixture M1. For the second mixture M2, a first significant correlation is observed between the polyphenols, nitrates, and COD. On the other hand, a second correlation is observed between pH and the concentrations of ammonium and phosphorus.

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Acknowledgements

The authors acknowledge: Water, Environment and Climate Change Team, Laboratory of Process Engineering and Environment, Faculty of Science & Technology, University Hassan II, Mohammedia, Morocco.

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Authors and Affiliations

  1. Laboratory of Process Engineering and Environment, University Hassan II, Mohammedia, Morocco

    S. K. Rifi, A. Driouich, Z. Ettaloui & S. Souabi

  2. Laboratory of Microbial Biotechnologies, Agrosciences, and Environment, University Cadi Ayyad (UCA), Marrakech, Morocco

    L. E. Fels & M. Hafidi

  3. Agrobioscience Program, Mohammed VI Polytechnic University (UM6P), Benguerir, Morocco

    M. Hafidi

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In this work all the authors have contributed to orient the study, the organization, the samples of wastewater, the drafting of the article. SKR phd student: carrying out research work. Prof. SS: supervisor. ZE phd student: participation in carrying out work in the laboratory. Dr AD: participated in the tests carried out. Prof. MH: contribution to the work carried out and to the drafting and interpretation of the results obtained. Prof. LEF: contribution to the work carried out and to the drafting and interpretation of the results obtained.

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Rifi, S.K., Fels, L.E., Driouich, A. et al. Sequencing batch reactor efficiency to reduce pollutant in olive oil mill wastewater mixed with urban wastewater. Int. J. Environ. Sci. Technol. 19, 11361–11374 (2022). https://doi.org/10.1007/s13762-021-03866-2

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