Abstract
The use of microalgae Chlorella kessleri VKPM A1-11 ARM (RF, NPO Algobiotechnology) for environmental and energy purposes is considered. The results of our study of the use of a biomass of C. kessleri microalgae as a biosorbent to purify model wastewater from Cu2+ ions under static conditions are presented. Biosorption is a promising technology for the treatment of industrial effluents containing various heavy metal compounds, but the issues of economic benefits of using biosorbents, their environmental safety, and the cost of disposal of waste sorbents are subject to much discussion. This paper proposes to utilized the biosorbent formed after wastewater treatment from copper as an additional fuel. The copper concentration in the filtrate was determined by colorimetric analysis with sodium diethyldithiocarbamate. The cleaning efficiency and sorption capacity of the dry mass of C. kessleri were obtained by calculation. The maximum sorption capacity for Cu2+ ions was 4.2 mg/g. The purification efficiency reached 87% at an initial concentration of Cu2+ ions of 97 mg/L. Tests to estimate the specific heat of combustion of the C. kessleri biomass and waste biosorbents based thereon were carried out by the calorimetric method using a bomb calorimeter. The specific heats of combustion were 22 125 and 21 674 kJ/kg, respectively. A comparison of these values with traditional energy carriers is given. A technological scheme was developed for a waste-free cycle of using C. kessleri to treat wastewater from industrial enterprises with the production of several valuable resources as end products, such as purified water, energy resources, fertilizers, and recycled metals. The results of our study can be applied in technologies for post-treatment of wastewater from various industrial enterprises using biological nonwaste resources.
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This study was supported by the Ministry of Science and Higher Education of the Russian Federation under the project “Technological Challenges and Socioeconomic Transformation in the Context of Green Transitions” (agreement no. 75-15-2022-1136 dated July 1, 2022).
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Politaeva, N.A., Illin, I.V., Oparina, A.M. et al. New Energy Approaches to the Use of Waste Biosorbents of the Microalgae Chlorella kessleri (Chlorellaceae, Chlorellales). Biol Bull Russ Acad Sci 50, 2596–2602 (2023). https://doi.org/10.1134/S1062359023100114
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DOI: https://doi.org/10.1134/S1062359023100114