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An In Vitro Study of the Effects of Temperature and pH on Lead Bioremoval Using Serratia marcescens

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  • Dafne Lecca-Caballero

    (Escuela de Ingeniería Ambiental, Universidad César Vallejo, Trujillo 13001, Peru)

  • Eyber Vega-Moreno

    (Escuela de Ingeniería Ambiental, Universidad César Vallejo, Trujillo 13001, Peru)

  • Luis Cabanillas-Chirinos

    (Instituto de Investigación en Ciencia y Tecnología, Universidad César Vallejo, Trujillo 13001, Peru)

  • Karen Diaz Del Aguila

    (Programa de Investigación Formativa e Integridad Científica, Universidad César Vallejo, Trujillo 13001, Peru)

  • Walter Rojas-Villacorta

    (Programa de Investigación Formativa e Integridad Científica, Universidad César Vallejo, Trujillo 13001, Peru)

  • Waldo Salvatierra-Espinola

    (Facultad de Ciencias de la Salud, Universidad Cesar Vallejo, Trujillo 13001, Peru)

  • Renny Nazario Naveda

    (Vicerrectorado de Investigación, Universidad Autónoma del Perú, Lima 15842, Peru)

  • Segundo Rojas-Flores

    (Escuela de Ingeniería Mecánica Eléctrica, Universidad Señor de Sipán, Chiclayo 14000, Peru)

  • Magaly De La Cruz-Noriega

    (Instituto de Investigación en Ciencia y Tecnología, Universidad César Vallejo, Trujillo 13001, Peru)

Abstract

Heavy metal contamination of water is a widespread problem in Peru and represents a potential threat to the ecosystem. Bacteria are an ecological alternative to treating these effluents. This research aims to determine the influence of temperature and pH on the lead (Pb) bioremoval in surface water using Serratia marcescens under laboratory conditions. The sample was collected from a stream located in Santiago de Chuco City (Peru). Treatments (T) were carried out by combining pH (5 and 7) and temperature (25, 30, and 35 °C). The bacterial inoculum ( S. marcescens ) was 3 × 10 8 CFU/mL, which was constant in all treatments. The lead bioremoval evaluation was performed in an airlift bioreactor and the incubation time was 24 h. The total lead concentration was determined using atomic absorption spectrophotometry. The results show that treatment 6 (temperature: 35 °C, pH: 5, and inoculum: 3 × 10 8 UFC/mL) showed a better result than the other treatments, with a removal value of 63.94%. Furthermore, the total lead concentration decreased from an initial concentration of 0.268 mg Pb/L to a final value of 0.0964 mg Pb/L. These results are still above the allowed water value (15 µg/L) according to Peruvian standards. On the other hand, temperature and pH influenced lead removal from surface water when S. marcescens was used after a short incubation period (24 h). Although an attempt was made to improve lead bioremoval by varying two parameters, temperature and pH, future research is still needed to investigate the effect of different inoculum concentrations, the use of microbial consortia, and a broader range of physicochemical parameters.

Suggested Citation

  • Dafne Lecca-Caballero & Eyber Vega-Moreno & Luis Cabanillas-Chirinos & Karen Diaz Del Aguila & Walter Rojas-Villacorta & Waldo Salvatierra-Espinola & Renny Nazario Naveda & Segundo Rojas-Flores & Maga, 2023. "An In Vitro Study of the Effects of Temperature and pH on Lead Bioremoval Using Serratia marcescens," Sustainability, MDPI, vol. 15(19), pages 1-11, September.
    • Handle: RePEc:gam:jsusta:v:15:y:2023:i:19:p:14048-:d:1245247
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    References listed on IDEAS

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    1. Monika Wróbel & Wojciech Śliwakowski & Paweł Kowalczyk & Karol Kramkowski & Jakub Dobrzyński, 2023. "Bioremediation of Heavy Metals by the Genus Bacillus," IJERPH, MDPI, vol. 20(6), pages 1-17, March.
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