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Assessment of the impact of diluted and pretreated olive mill wastewater on the treatment efficiency by infiltration-percolation using natural bio-adsorbents

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Abstract

The current study was carried out to treat the olive mill wastewater (OMW) via infiltration percolation process, using low-cost natural adsorbents that could improve the ability of the system to enhance the disposal rate of elimination of pollutant from the OMW. The experimental pilot was composed of three PVC (polyvinyl chloride) columns with 10 cm in diameter and 110-cm height equipped with lateral air entries. Each column was filled with four layers of 10 cm of a mixture of sand (70%), charcoal (20%) and sawdust (10%) respectively. These layers were alternated by four permeable layers of 10 cm of Pouzzolane. To assess the effect of the pretreatment on the efficiency of the system, three types of OMW were used: raw OMW, diluted OMW with domestic wastewater at 1/1(v/v) ratio and OMW pretreated with lime. For the column feed with raw OMW, an average removal of total COD (41%), dissolved COD (54%), NH4–N (40.25%), NO3 (15.76%), total phosphorus (55.63%) and orthophosphate (50.84%) was recorded. The results showed that the column feed with diluted OMW with domestic wastewater was the most efficient one with a removal rate that reached 93.2% of total COD, 86.2% of dissolved COD, 92% of polyphenol, 92% of orthophosphate (OP), 97.2% of total phosphorus (TP) and 81% of NH4–N. The pretreatment of OMW with lime gave the lowest removal rate for all the parameters: total COD (34%), dissolved COD (50%), NH4–N (30%), NO3 (− 21%), total phosphorus (15.19%) and orthophosphate (9.04%). This study demonstrated that the dilution is a way to optimize the efficiency of the system of infiltration-percolation in treating the OMW.

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Funding

This work is done as a part of a PhD thesis benefiting from the funding of the region Hauts-de-France and National Center for Scientific and Technical Research CNRST-Morocco.

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All the authors contributed to the study conception and design. Sample collecting was performed by MA and SBA. Material preparation, data collection and analysis were performed by SBA. The first draft of the manuscript was written by SBA. The authors MA and EL revised the content of the article, and SBA corrected the article according to the comments and the requested changes. All the authors commented on the previous versions of the manuscript. All the authors read and approved the final manuscript.

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Correspondence to Mounia Achak.

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Alaoui, S.B., Lamy, E. & Achak, M. Assessment of the impact of diluted and pretreated olive mill wastewater on the treatment efficiency by infiltration-percolation using natural bio-adsorbents. Environ Sci Pollut Res 30, 16305–16320 (2023). https://doi.org/10.1007/s11356-022-23373-2

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  • DOI: https://doi.org/10.1007/s11356-022-23373-2

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