Bioremediation of Naphthalene by the Chlorophycean Coelastrella saipanensis | ||||
| Egyptian Journal of Aquatic Biology and Fisheries | ||||
| Article 68, Volume 28, Issue 2, March and April 2024, Page 1093-1100 PDF (529.62 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/ejabf.2024.353160 | ||||
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| Author | ||||
| Ibtesam Kadhum Khuder et al. | ||||
| Abstract | ||||
| The freshwater green alga Coelastrella saipanensis was studied to assess its ability to degrade the PAHs (naphthalene). This species was cultured in Chu-10 medium under controlled conditions and treated with different concentrations (1, 3, 5, 10, 15, 25 and 25mg/ l) of naphthalene. The results showed that high removal efficiencies were obtained by the alga C. saipanensis for the concentrations: 1, 5, 10 and 15mg/ L, reaching 100% after 12 days of incubation. The increase in naphthalene concentration significantly decreased all the photosynthetic pigment contents studied, such as total chlorophyll, chlorophyll a, chlorophyll b and carotenoids. The results showed that the lowest values of total chlorophyll, chlorophyll a, chlorophyll b and carotenoids were 0.2533,0.1367,0.15,0.2133µg/ ml, respectively, recorded at 50ppm naphthalene. Moreover, the results showed a gradual increase in all the antioxidant parameters studied, such as CAT, SOD, MDA and ROS with increasing naphthalene concentration. The highest value was 0.292,0.953,1.74,16.416mg/ g, respectively, at 50ppm of naphthalene. It was concluded that C. saipanensis was a promising tool for the bioremediation of PAH compounds, particularly naphthalene, achieving 100% removal efficiency. Furthermore, the microalgae showed reduced levels of photosynthetic pigments and increased antioxidant levels, suggesting that the algae may have tolerance to naphthalene and could potentially degrade this harmful compound. | ||||
| Keywords | ||||
| Naphthalene; PAHs; Bioremediation; Coelastrella saipanensis | ||||
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