Advanced photobioreactor strategy for chromium phycoremediation with Spirulina platensis

Q1 Environmental Science

Bioresource Technology Reports Pub Date : 2025-10-09 DOI:10.1016/j.biteb.2025.102343

Erisson Paulo Borges Lopes, Larissa Nayhara Soares Santana Falleiros, Fabiana Regina Xavier Batista

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Abstract

The study investigates the phycoremediation of Cr(VI) by Spirulina platensis under static cultivation (batch system) and a tubular photobioreactor. An inoculum of Spirulina platensis (1.2 g L⁻¹) was exposed to 30 and 60 mg L⁻¹ Cr(VI). Cellular resistance was verified until day seven, after which chromium exposure led to cell growth inhibition and reduced chlorophyll production. Chromium removal was verified through two mechanisms: initial passive biosorption on cell walls, facilitated by functional groups identified via Fourier-transform infrared spectroscopy, followed by active intracellular bioaccumulation, where Cr(VI) was reduced to less toxic Cr(III) via enzymatic activity. Scanning electron microscopy and energy-dispersive X-ray spectroscopy confirmed the adsorption of chromium on the cell surface. In the static system, final biomass reached 0.65 g L⁻¹ (46 % reduction), while the photobioreactor produced 3.19 g L⁻¹ (18.2 % below control). Total chromium removal efficiencies reached 69.3 % (10 days) and 67.1 % (7 days) in static and photobioreactor systems, respectively.

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螺旋藻藻修复铬的先进光生物反应器策略

在静态培养（间歇式）和管式光生物反应器条件下，研究了螺旋藻对铬（VI）的藻修复作用。将接种的螺旋藻（1.2 g L - 1）暴露于30和60 mg L - 1 Cr（VI）中。直到第7天，细胞抗性才得到证实，之后铬暴露导致细胞生长抑制和叶绿素产生减少。铬的去除通过两种机制得到验证：最初在细胞壁上的被动生物吸附，通过傅里叶变换红外光谱识别的官能团促进，然后是细胞内的主动生物积累，其中Cr（VI）通过酶活性还原为毒性较小的Cr（III）。扫描电镜和能量色散x射线光谱证实了铬在细胞表面的吸附。在静态系统中，最终生物量达到0.65 g L−1（减少46%），而光生物反应器产生3.19 g L−1（比控制低18.2%）。在静态和光生物反应器系统中，总铬去除率分别达到69.3%（10天）和67.1%（7天）。

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