Abstract
The present study evaluates the potential of a Leptolyngbya sp. based microbial consortia to capture and metabolize atmospheric CO2 to valuable bioproducts, while implementing simultaneously confectionery wastewater treatment. A series of experiments were conducted at different initial dissolved chemical oxygen demand (d- COD) levels on a laboratory scale. Atmospheric CO2 was continuously supplied to the cultivation and CO2 levels were continuously monitored. Biomass samples were selected and analyzed for total biomass, proteins, carbohydrates, lipids, chlorophyll-a and phycobiliproteins content. The substrate's d-COD was also measured continuously. In all cases, the d-COD of the wastewater was reduced to the legal limits within 2–4 days. The biomass concentration reached levels up to 2.5 ± 0.17 g L−1, with a maximum carbohydrate content of 40 % and CO2 sequestration up to 86 %. The highest proteins and phycobiliproteins content were obtained with initial d-COD equal to 500 ±20 mg L−1, and the maximum CO2 removal was 94 %. These results indicate that this system has significant potential for both CO2 removal and wastewater treatment, leading to valuable biomass products.
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