Growth kinetic model of Chlorella vulgaris in a dark biogas slurry culture system based on a light attenuation model
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2025-01
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Journal Article
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Abstract
Using biogas slurry to culture microalgae can realize pollutants transformation into useful biomass, it has been attracted by the whole recycling-oriented society and low-carbon effect. However, the dark color of biogas slurry caused light attenuation, which weakened the light provision for microalgal growth. In this work, the microalgal growth models of dark color biogas slurry-microalgae cultivation system (DBS-M) were established. Results showed that chroma can be introduced in Lambert-Beer Law for describing the rules of light condition changes. While microalgal cells concentration contribute more light attenuation effect compared with chroma: the degree of light attenuation caused by 1000 Hazen's dark biogas slurry is equivalent to that by 0.18gL⁻¹ biomass. The dynamic changes of biomass concentration and the light attenuation model in DBS-M can also be combined with average light intensity to form the optimal Pearl-Monod (PM) model for predicting microalgal growth, which can respond to the changes of optical path (different photobioreactors) and biomass concentration in real production system. This further improves the accuracy and universality of the models. According to the above models, 5 cm is desirable PBRs optical path. Under this condition, with the initial biomass was below 0.4gL⁻¹ and I0 was 240–480 μmolm⁻²s⁻¹, μ of C. vulgaris reached above 1.0d⁻¹. Finally, a semi-continuous culture strategy for C. vulgaris growth in biogas slurry and an average daily yield (P) model was established. According to the model, the highest P reached 0.186 g L⁻¹d⁻¹ when the daily initial biomass was maintained at 0.375 g L⁻¹d⁻¹ under the semi-continuous culture, which was 23.75 % higher than that of the sequencing batch. This work might be helpful for the operation of dark color biogas slurry-microalgae cultivation system in large scale in the future.
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85
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103821
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Elsevier
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Subject
Dark color biogas slurry; Growth kinetic model; Light attenuation model; Microalgae; Semi-continues culture strategy; Wastewater resource recovery