Potential of coal fly ash as low-cost culture medium for cultivation of microalgae chlorococcum and sustainable nutrient recovery from CFA culture medium

Prabhat Kumar Jaiswal (), Barun Kumar Nandi () and Vinod Kumar Saxena ()
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Prabhat Kumar Jaiswal: Indian Institute of Technology (Indian School of Mines)
Barun Kumar Nandi: Indian Institute of Technology (Indian School of Mines)
Vinod Kumar Saxena: Indian Institute of Technology (Indian School of Mines)

Environment, Development and Sustainability: A Multidisciplinary Approach to the Theory and Practice of Sustainable Development, 2024, vol. 26, issue 3, No 101, 8045-8063

Abstract: Abstract Present study evaluated the susceptibility of essential nutrients available in thermoelectric coal fly ash (CFA) for the cultivation of screened microalgae maintained in demineralized water − CFA (DMW + CFA) as culture medium. Different concentration of CFA culture medium was prepared from 0.5 to 4.0 g/L of CFA, but the low nitrate and phosphate content in culture medium was not plausible for growth of cells; therefore, additional NaNO3 and KH2PO4 were added. Culture mediums were inoculated with characterized microalgae chlorococcum sp. and placed in ambient dark/light period for growth study which was measured with time by optical density. Max. OD @ 680 and @750 nm observed as 0.396 ± 0.073 and 0.306 ± 0.072 for 0.5 g/L culture medium, respectively. Max. biomass yield was 562.21 ± 95.54 mg/L for 0.5 g/L culture medium; however, yield was 40.00% low as compared to BG-11 culture. Max. sp. growth rate observed was 0.253 ± 0.007 d−1 for 0.5 g/L. The max total lipid was 139.0 ± 7.5 mg/L for 1.0 g/L culture, which was comparable with BG-11. NO3-N and PO4-P concentration reduced > 90% whereas Na+, K+ and Ca+ content was reduced > 75.00–90.00%. ORP was also intriguingly measured for oxidative state of culture medium during growth phase and found to be maintained between + 350 and + 25 mV. Max. total chlorophyll analysed was 4.64 ± 0.56 µg/ml. The results support that CFA may be used as culture medium for chlorococcum sp. for biomass and lipid production and subsequent nutrient recovery from CFA.

Keywords: Coal fly ash (CFA); Optical density; Microalgae; DM water; Oxidation-reduction potential (ORP) (search for similar items in EconPapers)
Date: 2024
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DOI: 10.1007/s10668-023-03048-9

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