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33. Biohydrogen production from macroalgae via sonic biosurfactant disintegration: An energy efficient approach

Author

Shabarish S., Tamilarasan K., Rajesh Banu J., and Godvin Sharmila V.

Subjects
Macroalgae, Disintegration, Saponin, Biohydrogen, Environmental sciences, GE1-350, Environmental effects of industries and plants, TD194-195
Abstract

An energy-efficient disintegration approach used to produce biohydrogen from marine macroalgae biomass (Chaetomorpha antennina) was demonstrated in this study. The suggested research aimed to explain the function of macroalgae disintegration by sonication (DS) and disintegration by a sonic surfactant (DSS) in biohydrogen production. Biosurfactant dosage (3 μL/g TS), sonic intensity (50%) and disintegration duration (30 min) were found to be an optimum conditions for DSS with respect to dissoluted organics release (DOR). Volatile fatty acids (VFA) generation was higher in DSS (1845 mg/L) than DS (864 mg/L) When DS and DSS were compared, DSS had a substantially higher disintegration efficiency (DE) and biohydrogen yield (26%, 147 mL H2/gCOD) than DS (21.5%, 121 mL H2/gCOD). Net energy (NE) obtained in DSS (0.044 kWh/kg of biomass) was more than the DS (−0.02 kWh/kg of biomass). DSS had a higher energy ratio of 1.8, while DS had a lower energy ratio of 0.7. Overall, DSS was found to be an energetic way to produce biohydrogen.

Published
2023
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42. Indexing energy and cost of the pretreatment for economically efficient bioenergy generation

Author

Preethi, Gunasekaran M, and Rajesh Banu. J

Subjects
waste biomass, bioenergy, pretreatment, sustainable, solubilization, General Works
Abstract

The growing necessity for energy worldwide has led to the hunt for an interminable solution in the form of sustainable energy generation. To accomplish sustainability, these problems can be resolved using renewable waste biomass, which is readily accessible and low priced. Moreover, the ecological issue due to the disposal of this waste biomass into the environment is also counteracted by the use of this biomass for energy generation along with the substantial solid reduction for disposal. The presence of complex biopolymers in biomass, which hasten the hydrolysis step during energy generation, was enhanced by the application of a pretreatment method. The efficiency of the pretreatment methods was enhanced by maintaining the cost and energy usage since the commercialization of this method is largely limited. The major economic drivers are based on solid concentration and, thus, lead to higher capital costs. This study reveals the wide assortment of current progression in pretreatment techniques for treating waste biomass with special focus on combined and phase-separated pretreatment. Additionally, it converses the advantages and limitations of pretreatment methods. This pivotal investigation brings about the cost- and energy-effective conversion solution that paves the way for a sustainable energy system.

Published
2023
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