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<p>In this study, the biological treatment (BT) of poultry slaughterhouse wastewater (PSW) was developed using the microalga <i>Nannochloropsis oculata</i>. The tests were conducted in batch-type photobioreactors operated for 14 days, using an 8 × 5 mixed factorial design to evaluate time (0, 2, 4, 6, 8, 10, 12, and 14 days) and inoculum concentration (5, 15, 25, 35, and 45% v v<sup>− 1</sup>). The following response variables were evaluated: cell density (CD), pH, chemical oxygen demand (COD), soluble chemical oxygen demand (sCOD), total nitrogen (TN), and total phosphorus (TP). Additionally, at the end of the experiments, the composition of the biomass obtained during the BT was evaluated. According to the CD kinetic parameters obtained with the 4-parameter generalized Gompertz model, the best growth of <i>N. oculata</i> occurred in the 25% experiments (<i>k</i><sub><i>s</i></sub> = 1.013; µ<sub>max</sub> = 0.3727 days⁻¹; and λ = 0.7288 days). <i>N. oculata</i> proved suitable for the PSW BT; however, the inoculum percentage and time directly influenced contaminant removal efficiencies, as well as the amount and quality of the biomass generated. Based on the ANOVAs, both factors had significant effects on the removal of COD, sCOD, TN, and TP, with the highest efficiencies observed at COD = 66.13% (15%); sCOD = 87.9% (15%); TN = 91.86% (45%); TP = 86.67% (35%). On the other hand, the highest biomass yield was obtained in 45% of the experiments (1.73 ± 0.17&#xa0;g L⁻¹), characterized by the highest concentrations of lipids (38.79 ± 4.23%), proteins (32.44 ± 2.58%), and PUFAs, as determined qualitatively by FT-IR.</p> Graphical Abstract <p></p>

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Kinetics of Biological Treatment of Poultry Slaughterhouse Wastewater in Photobioreactors Operated with Nannochloropsis oculata: A Strategy for the Valorization of Agro-Industrial Effluents

  • 期刊论文

  • 发表日期：

    2025年11月21日

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  • Roger E. Sales-Pérez,
  • Joaquín Estrada-García,
  • José M. Hernández-Martínez,
  • Solmaría M. Pérez-Guzmán,
  • Juan M. Méndez-Contreras

摘要

In this study, the biological treatment (BT) of poultry slaughterhouse wastewater (PSW) was developed using the microalga Nannochloropsis oculata. The tests were conducted in batch-type photobioreactors operated for 14 days, using an 8 × 5 mixed factorial design to evaluate time (0, 2, 4, 6, 8, 10, 12, and 14 days) and inoculum concentration (5, 15, 25, 35, and 45% v v− 1). The following response variables were evaluated: cell density (CD), pH, chemical oxygen demand (COD), soluble chemical oxygen demand (sCOD), total nitrogen (TN), and total phosphorus (TP). Additionally, at the end of the experiments, the composition of the biomass obtained during the BT was evaluated. According to the CD kinetic parameters obtained with the 4-parameter generalized Gompertz model, the best growth of N. oculata occurred in the 25% experiments (ks = 1.013; µmax = 0.3727 days⁻¹; and λ = 0.7288 days). N. oculata proved suitable for the PSW BT; however, the inoculum percentage and time directly influenced contaminant removal efficiencies, as well as the amount and quality of the biomass generated. Based on the ANOVAs, both factors had significant effects on the removal of COD, sCOD, TN, and TP, with the highest efficiencies observed at COD = 66.13% (15%); sCOD = 87.9% (15%); TN = 91.86% (45%); TP = 86.67% (35%). On the other hand, the highest biomass yield was obtained in 45% of the experiments (1.73 ± 0.17 g L⁻¹), characterized by the highest concentrations of lipids (38.79 ± 4.23%), proteins (32.44 ± 2.58%), and PUFAs, as determined qualitatively by FT-IR.

Graphical Abstract