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Sustainable cultivation of microalgae Euglena sp. IDN 22 using anaerobic digested manure wastewater: Integrating circular bioeconomy principles in agroindustry
 
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1
Department of Animal Products Technology, Faculty of Animal Science, Gadjah Mada University, Indonesia
 
2
Biotechnology Laboratory, Faculty of Biology, Gadjah Mada University, Indonesia
 
These authors had equal contribution to this work
 
 
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Ambar Pertiwiningrum   

Department of Animal Products Technology, Faculty of Animal Science, Gadjah Mada University, Indonesia
 
 
J. Ecol. Eng. 2025; 26(8)
 
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ABSTRACT
This research was conducted by utilizing anaerobic digested manure wastewater (ADMW) as a growth medium for microalgae Euglena sp. IDN 22. This research aims to determine the effectiveness of using ADMW as a rich nutrient supplement to cultivate microalgae Euglena sp. IDN 22. Multiple dilutions of 0%, 25%, 50%, and 75% were applied to ADMW, and the growth of Euglena sp. IDN 22 was analyzed using the growth rate of microalgae cell counts. The number of cells was observed with a haemocytometer. The cultivation of Euglena sp. IDN 22 in the ADMW medium was conducted in lab-scale (1 L) photobioreactors for 15 days of cultivation. The analysis of 25% ADMW showed C/N and P/N of 7.40 ± 0.17 and 1.27± 0.03, while 50% ADMW analysis yielded 14.99 ± 0.51 and 1.72 ± 0.07. The best growth rate trend of Euglena sp. IDN 22 in ADMW was shown by the treatment with 25% ADMW dilution with a maximum growth of 62.92 x 104 cells/ml compared to a maximum growth of 79.92 x 104 cells/ml with 0% ADMW as a control. Slow growth activity was shown by 50% and 75% ADMW, with a maximum growth of only 10.67 x 104 cells/ml and 4.45 x 104 cells/ml, respectively. The slow growth activity in 50% ADMW, with a maximum growth of only 10.67 x 104 cells/ml, demonstrated a significant difference (p>0.01). The results of this study prove that the integration of 25% ADMW and Euglena sp. IDN 22 cultivation can be an effective valorization concept and an opportunity to transform biogas production waste towards a circular economy in agroindustry.
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