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Analysis of Biomaterials as Green Coagulants to Control Suspended Solids for Surface Water Treatment

Author

Listed:
  • Rosa Devesa-Rey

    (Defense University Center, Naval Academy, University of Vigo, Plaza de España 2, 36920 Marín-Pontevedra, Spain)

  • J.D. González-Aller

    (Defense University Center, Naval Academy, University of Vigo, Plaza de España 2, 36920 Marín-Pontevedra, Spain)

  • Santiago Urréjola

    (Defense University Center, Naval Academy, University of Vigo, Plaza de España 2, 36920 Marín-Pontevedra, Spain)

Abstract

This study explores the use of natural, ecological coagulant-flocculants to reduce suspended particles in water. Three compounds were tested, namely: diatomaceous earth, calcium lactate and lactic acid. For this purpose, experiments in jar tests were carried out and the best compound was submitted to an optimization in order to evaluate the most significant parameters affecting its use as coagulant-flocculant. First results evidenced that lactic acid remove 71% of the suspended particles during the first five minutes, and up to 83% during the first 15 min. To optimize its use, the range of suspended particles concentration, lactic acid dose and salinity gradient was tested by means of an incomplete 3 3 factorial design. This technique allows reducing the number of experiments to be carried out through a response surface methodology, which enables to infer the values of the dependent variables in not studied situations, by means of predictive equations. As a result of the experiments carried out, optimal conditions to remove suspended particles were set at a lactic acid concentration of 1.75 g·L −1 . As lactic acid may be obtained biotechnologically from organic wastes, this use supposes a promising area by keeping products and materials in use and contributing to a circular economy.

Suggested Citation

  • Rosa Devesa-Rey & J.D. González-Aller & Santiago Urréjola, 2020. "Analysis of Biomaterials as Green Coagulants to Control Suspended Solids for Surface Water Treatment," IJERPH, MDPI, vol. 17(5), pages 1-14, March.
    • Handle: RePEc:gam:jijerp:v:17:y:2020:i:5:p:1777-:d:330417
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    References listed on IDEAS

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    1. Soltanian, Salman & Aghbashlo, Mortaza & Farzad, Somayeh & Tabatabaei, Meisam & Mandegari, Mohsen & Görgens, Johann F., 2019. "Exergoeconomic analysis of lactic acid and power cogeneration from sugarcane residues through a biorefinery approach," Renewable Energy, Elsevier, vol. 143(C), pages 872-889.
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