Effects of various spectral compositions on micro-polluted water purification and biofuel feedstock production using duckweed

The purification of micro-polluted water for drinking water can play an important role in solving water crisis. To investigate the effects of spectral composition on nutrient removal and biofuel feedstock production using duckweed, Landoltia punctata was cultivated in different spectral compositions...

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Veröffentlicht in:Environmental science and pollution research international 2022-07, Vol.29 (34), p.52003-52012
Hauptverfasser: Li, Qi, Yi, Zhuolin, Yang, Guili, Xu, Yaliang, Jin, Yanling, Tan, Li, Du, Anping, He, Kaize, Zhao, Hai, Fang, Yang
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Sprache:eng
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Zusammenfassung:The purification of micro-polluted water for drinking water can play an important role in solving water crisis. To investigate the effects of spectral composition on nutrient removal and biofuel feedstock production using duckweed, Landoltia punctata was cultivated in different spectral compositions in micro-polluted water. Results showed that the nitrogen and phosphorus removal efficiency were 99.4% and 93.5% at an recommended red and blue light photon intensity mixture ratio of 2:1. Meanwhile, maximum growth rate of duckweed (11.37 g/m 2 /day) was observed at red/blue = 2:1. In addition, maximum starch accumulation rate of duckweed was found to be 6.12 g/m 2 /day, with starch content of 36.63% at red/blue = 4:1, which was three times higher when compared to that of white light. Moreover, the recommended ratio of red and blue light was validated by economic efficiency analysis of energy consumptions. These findings provide a sustainable environmental restoration method to transform water micro-pollutants to available substances.
ISSN:0944-1344
1614-7499
1614-7499
DOI:10.1007/s11356-022-19488-1