Removal of polycyclic aromatic hydrocarbons (PAHs) from produced water using the microalgae Chlorella vulgaris cultivated in mixotrophic and heterotrophic conditions

被引：0

作者：

Ñañez K.B. ^{[1
]}

Rios Ramirez K.D. ^{[1
]}

Cordeiro de Oliveira O.M. ^{[1
]}

Reyes C.Y. ^{[2
]}

Andrade Moreira Í.T. ^{[1
]}

机构：

[1] Federal University of Bahia, Geosciences Institute, R. Barão de Jeremoabo, s/n - Ondina, Salvador, 40170-290, BA

[2] University of the Amazon, Campus Porvenir street 17 Diagonal 17 with Carrera 3F, CAQ, Florencia

来源：

Chemosphere | 2024年 / 356卷

关键词：

Biostimulation; Circular bioeconomy; Phycoremediation; Recalcitrant compounds; Wastewater;

D O I：

10.1016/j.chemosphere.2024.141931

中图分类号：

学科分类号：

摘要：

Chlorella vulgaris was cultivated for 15 days in 10 different treatments under mixotrophic and heterotrophic conditions, using wastewater from oil and poultry industries as the culture medium. The blends were made with produced water (PW), sterilized produced water (PWs), sterilized poultry wastewater (PoWs), sterilized seawater (SWs), and the addition of sodium nitrate to evaluate cell growth in treatments and the removal of PAHs. The heterotrophic condition showed more effective removal, having an initial concentration of 3.93 μg L−1 and a final concentration of 0.57 μg L−1 of total PAHs reporting 83%, during phycoremediation of (PW) than the mixotrophic condition, with an initial concentration of 3.93 μg L−1 and a final concentration of 1.96 and 43% removal for the PAHs. In the heterotrophic condition, the blend with (PWs + SWs) with an initial concentration of 0.90 μg L−1 and a final concentration of 0.32 μg L−1 had 64% removal of total PAHs compared to the mixotrophic condition with 37% removal having an initial concentration of 0.90 μg L−1 and a final concentration of 0.56 μg L−1. However, the best result in the mixotrophic condition was obtained using a blend of (PWs + PoWs) that had an initial cell concentration of 1.18 × 105 cells mL−1 and reached a final cell concentration of 4.39 × 105 cells mL−1, an initial concentration of 4.76 μg L−1 and a final concentration of 0.37 μg L−1 having a 92% total removal of PAHs. The biostimulation process increased the percentage of PAHs removal by 45% (PW) in the mixotrophic condition. This study showed that it is possible to allow an environmental remediation strategy that significantly reduces effluent toxicity and generates high value-added biomass in contaminated effluents rich in nutrients and carbon, based on a circular bioeconomy model. © 2024 Elsevier Ltd

引用

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