Aquatic macrophytes (Spirogyra porticalis and Nymphaea L.) as substrates for biofuel production: potentials and challenges

Anyanwu, Ihuoma N.; Okeke, Chinelo S.; Nwankwo, Samuel C.; Nwachukwu, Millicent O.; Michael, Michael O.; Opara, Vincent C.; Anorue, Chioma O.; Azuama, Cecil O.; Oti, Precious O.; Ekechukwu, Leona E.; Ezenwa, Chika; Chamba, Emmanuel B.

doi:10.1016/j.sciaf.2022.e01412

Cited by 4 publications

(1 citation statement)

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“…is a filamentous green alga that is found ubiquitously in bodies of stagnant water and slowly flowing freshwater rivers all over the world [20]. It can also thrive in wastewater and is a widely known indicator of pollution and eutrophication in aquatic ecosystems [21]. Owing to its ability to remove nutrients from water bodies and its ability to outgrow other algae species, Spirogyra sp.…”

Section: Introductionmentioning

confidence: 99%

Exploring the Utilization Potential of Spirogyra sp. Biomass for Ethanol Production: A Study on Saccharification Optimization and High-Temperature Ethanol Fermentation

Vichit,

Salakkam,

Fiala

2023

Processes

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Spirogyra sp. is one of the potential feedstocks for bioethanol production, owing to its high carbohydrate and low lignin contents. However, to date, its use has scarcely been reported, particularly in high-temperature ethanol fermentation. The present study investigated the use of Spirogyra biomass as a bioethanol feedstock by optimizing the conditions for biomass saccharification, followed by ethanol fermentation via thermotolerant yeasts, i.e., Saccahromyces cerevisiae DBKKU Y-53, Kluyveromyces marxianus DBKKU Y-102, and Pichia kudriazevii RZ8-1. The optimization of the algal biomass hydrolysis using response surface methodology (RSM) showed that a maximum total sugar production of 14.75 ± 0.13 g/L was attained using 2.67% (v/v) sulfuric acid, 7.97% (w/v) of biomass loading, and 20 min of hydrolysis time. The fermentation of Spirogyra sp. hydrolysate containing 20 g/L of total sugar at 37 °C showed that S. cerevisiae DBKKU Y-53, K. marxianus DBKKU Y-102, and P. kudriazevii RZ8-1 produced 4.05 ± 0.35 g/L, 4.48 ± 0.13 g/L, and 4.47 ± 0.19 g/L of ethanol, respectively. At 40 °C, lower ethanol production of 1.07 ± 0.47 g/L, 3.93 ± 0.24 g/L, and 3.97 ± 0.19 g/L, respectively, were observed. Nevertheless, P. kudriazevii RZ8-1 exhibited a promising potential for the further development of a high-temperature ethanol fermentation process.

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Section: Introductionmentioning

confidence: 99%