S. no. | Algal species | Reactor/growth conditions and products | References |
---|---|---|---|
1 | Chlamydomonas reinhardtii GY-D55 | Flat-plate airlift photobioreactor. Production rate 0.000959Â kg H2/kg dry cells/h | [142] |
2 | Nannochloropsis gaditana | Down-flow type supercritical water gasification reactor. Product composed of hydrogen (52.0%), methane (17.9%) and CO2 (23.0%) with 97.4 wt% gasification efficiency | [143] |
3 | Chlorella vulgaris | Supercritical water gasification of microalgal hydrothermal liquefaction for hydrogen production. Non-stirred batch stainless steel Parr reactor produced 30Â mol H2/kg algae | [144] |
4 | Laminaria digitate, Chlorella pyrenoidosa, Nannochloropsis oceanica | Two-stage batch co-fermentation resulted in 6.6 and 70.9% energy conversion efficiencies during hydrogen fermentation and combined H2–CH4 production, respectively. Hydrogen yield of 94.5–97.0 mL/g volatile solids | [145] |
5 | Chlamydomonas sp., Chlorella sp., Chlorella vulgaris TISTR 8580 and Chlorella protothecoides | Biophotolysis-based hydrogen and lipid production using crude glycerol as an exogenous carbon source. The optimal conditions were glycerol concentration of 16 g/L, initial pH 6.8, and light intensity of 48 μmol photon/m2 s, yielding 11.65 ± 0.65 mL/L hydrogen along with lipid content > 40% in the microalgal biomass | [146] |
6 | Scenedesmus dimorphus | Combination of separate hydrolysis and fermentation and simultaneous saccharification and fermentation found most effective. Lipid-extracted biomass yielded 0.26 g bioethanol/g lipid-extracted biomass at pH 5, temperature of 34 °C, and microalgae biomass loading at 18 g/L | [147] |
7 | Dunaliella sp. | Microalgae used as a feedstock for bioethanol production. 72Â h of incubation at substrate concentration of 30Â g/L microalgal biomass and 3Â mL inoculums at pH 6 yielded 7.26Â g/L bioethanol | [148] |
8 | Scenedesmus dimorphus | Microalgae used as a feedstock for bioethanol production. Fermentation conducted at pH 5, temperature of 34 °C, and microalgae biomass loading at 18 g/L via simultaneous saccharification and fermentation resulted in a theoretical yield of bioethanol that exceeded 90% | [149] |
9 | Mixed microalgae cultures | Fermentation of the glucose after enzymatic hydrolysis yielded 0.46Â g ethanol/g glucose | [150] |
10 | Porphyridium cruentum | Freshwater biomass produced ethanol more efficiently than the sea water biomass with ethanol conversion yields of 70.3 and 65.4%, respectively, after 9Â h. Simultaneous saccharification and fermentation processing was superior to separate hydrolysis and fermentation processing for bioethanol production | [31] |
11 | Scenedesmus acutus | Purified lipids were catalytically deoxygenated to yield liquid product consisting of 99 wt% hydrocarbons and diesel-like (C10–C20) hydrocarbons | [151] |
12 | Dunaliella tertiolecta | Carbon nanotube (CNT)-supported metal catalyst for hydrothermal liquefaction of Dunaliella tertiolecta to produce bio-oil. Bio-oil conversion and yield increased to 95.78 and 40.25 wt%, respectively, when Co/CNTs were employed as catalysts | [13] |
13 | Euglena sanguinea | Catalyst calcinated from natural white mussel shell at 1000 °C used in the transesterification process. The algal biodiesel showed the presence of saturated fatty acids: C16:0, C18:0, C22:0, C24:0 and monounsaturated fatty acids C18:1 | [41] |