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A Cost-Effective Strategy for Leachate Treatment Optimization: Biostimulation Using Carob Powder as Co-substrate

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Abstract

In developing countries, most of the daily produced household wastes are buried in landfill sites without any prior treatment. One of the many problems associated with these landfills is the formation of leachate. Because of its complexity and unpredictable composition, leachate has always constituted a challenging task for effluent managers. Despite the countless techniques that have been developed since then, leachate treatment still raises big concerns about the efficiency and sustainability of a suitable strategy. Accordingly, this study is carried out aiming at the optimization of leachate treatment through biostimulation using carob powder as a co-substrate. The added amount of biostimulant corresponds approximately to the addition of 3, 1, and 0.4 g/L of sucrose, fructose, and glucose, respectively. The adopted experimental system is based on the anaerobic process using an up-flow anaerobic sludge blanket (UASB) reactor, which was operated at HRT and OLR of 24 h and 26.1 kg COD/m3 d, respectively. For carob particle size larger than 2 mm, only a small amount of biogas was produced and the COD removal efficiency was lower than 77%, indicating that the poor quality of the effluent persists. However, 97% of COD was efficiently removed and a volume of 2.06 L/Lleachate of biogas was produced using a carob particle size of 0.250 mm. The obtained results showed also that the amount of produced biogas increases as the carob sugar content increases. Literally, a 1% fraction of total sugar content resulted in an increase of 17.9 mL/Lleahate of the produced biogas. Finally, the use of 10 g/L of carob amendment improved COD removal and exhibited less influence on syntrophs and methanogens since a large amount of biogas was generated.

Article Highlights

  • Carob powder biostimulant could be effectively used to optimize leachate treatment.

  • Carob particle size and total sugar content affected the treatment efficiency.

  • Thinner the carob particles, larger the produced biogas and larger the COD removal.

  • 1%-fraction of sugar content resulted in an increase of 17.9 mL/Lleahate of biogas.

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Acknowledgements

This research was undertaken at the University of Sultan Moulay Slimane of Beni Mellal in collaboration with the municipality of Kasba Tadla. The authors thank all collaborators that contributed to achieve and succeed this work.

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Authors and Affiliations

  1. Team of Applied Teledetection and SIG To Geosciences and Environment, Faculty of Sciences and Technics, 23000, Beni Mellal, Morocco

    Souaâd Baâti, Fatima Benyoucef & Abderrahmene El Ghmari

  2. Team of Water and Environmental Management (G2E), National School of Applied Sciences (ENSAH), Abdelmalek Essaadi University, 32003, Al-Hoceima, Morocco

    Abdelhadi Makan

  3. Laboratory of Industrial Engineering, Faculty of Sciences and Technics, 23000, Beni Mellal, Morocco

    Abdelaziz El Bouadili

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  1. Souaâd Baâti
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  2. Fatima Benyoucef
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  4. Abdelaziz El Bouadili
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  5. Abderrahmene El Ghmari
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Correspondence to Abdelhadi Makan.

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Baâti, S., Benyoucef, F., Makan, A. et al. A Cost-Effective Strategy for Leachate Treatment Optimization: Biostimulation Using Carob Powder as Co-substrate. Int J Environ Res 15, 535–541 (2021). https://doi.org/10.1007/s41742-021-00332-2

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  • DOI: https://doi.org/10.1007/s41742-021-00332-2

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