Increasing microalgal carbohydrate content for hydrothermal gasification purposes

Roudabeh Samiee-Zafarghandi, Javad Karimi-Sabet, Mohammad Ali Abdoli and Abdolreza Karbassi

Renewable Energy, 2018, vol. 116, issue PA, 710-719

Abstract: This research examines the growth of Chlorella sp. microalgae under nutrient limitation (10–200 mg NaNO3 L−1 and 10–70 mg K2HPO4 L−1) and different light intensities (60–450 μmol photons m−2 s−1) for achieving maximum carbohydrate content and biomass productivity using Response Surface Methodology (RSM) technique. According to the results, nutrition limitation had considerable effect on carbohydrate accumulation especially phosphorus concentrations; as in constant light intensities, maximum carbohydrate content was obtained in minimum concentration of K2HPO4. Under favorable circumstances; i.e. K2HPO4 = 10 mg L−1, NaNO3 = 105 mg L−1, and light intensity = 255 μmol photons m−2 s−1 the highest carbohydrate content by 60.9% was achieved. Moreover, Supercritical Water Gasification (SCWG) of carbohydrate enriched microalgal biomass is able to produce much more hydrogen gas in comparison to the basic microalgal biomass. In addition, a 1.85 times increase in amount of produced gas is appeared as a result of a change in biochemical composition of the microalgal biomass.

Keywords: Microalgal carbohydrate content; Biomass productivity; Environmental stress; RSM; Supercritical water gasification (search for similar items in EconPapers)
Date: 2018
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Citations: View citations in EconPapers (5)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:116:y:2018:i:pa:p:710-719

DOI: 10.1016/j.renene.2017.10.020

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