Batch bioethanol production via the biological and chemical saccharification of some Egyptian marine macroalgae

Abstract

The usage of marine macroalgae (i.e. seaweeds) as feedstock for bioethanol; an alternative and/or complimentary to petro-fuel, would act as triple fact solution; bioremediation process for ecosystem, renewable energy source and economy savings.

Third generation bioethanol from invasive macroalgae Sargassum muticum using autohydrolysis pretreatment as first step of a biorefinery

“…The maximum ethanol yield for Ethanol Red ® was 87.7% (9.95 g of ethanol/L), while PE2 and the laboratory strain CEN.PK 113-7D were near of 100% (11.65 and 11.32 g of ethanol/L, respectively). In only 8.5 h, ethanol yields between 87 and 95% are achieved, pretty much faster than with other macroalgae and/or pretreatments [35,36]. As example, after 8.5 h of SSF, the yields obtained with the different strains were 87.1% with Ethanol Red ® (instead maximum values of 87.7% at 23.6 h), 95.3% with PE2 and 94.4% with CEN.PK 113-7D (instead 100% after 28.6 h), that means 93e99% of maximum yield in only 8.5 h.…”

Coralline Algae in a Changing Mediterranean Sea: How Can We Predict Their Future, if We Do Not Know Their Present?

“…Biochemical data for samples identified with this name were provided in several studies performed mainly by northern African investigators. These examined the content of chemical contaminants in environmental monitoring (Al-Masri et al, 2003;Abdallah and Abdallah, 2008;Olgunoglu and Polat, 2008;Hernández et al, 2011;Laib and Legouchi, 2012), biological activities of algal extracts (Abd-Elnaby, 2010; Khairy and El-Sheikh, 2015) and biochemical composition in relation to nutritional value Ozogul, 2009, 2013) or for biodiesel production (El Maghraby and Fakhry, 2015;Soliman et al, 2018).…”

Recent trends on seaweed fractionation for liquid biofuels production

“…Tapia-Tussell et al, (2018) applied the Bm-2 strain of Trametes hirsuta, resulting in a degradation of fibers and the creation of gaps on the macroalgae surface. Although good results can be obtained, the use of biological pretreatments usually implies long-time pretreatments and/or its combination with other pretreatments, especially chemical pretreatments with dilute-acid or mild-alkali hydrolysis (Soliman et al, 2018;Thompson et al, 2019).…”

“…In this way, algae are the third generation feedstock and currently stand out as a potential biomass to obtain biofuels (Michalak, 2018) due to some advantages such as: i) ubiquity, ii) low rate of biomass fluctuation owing to overpopulation, iii) production of the majority of oxygen in the planet with a high absorption of annual CO 2 , iv) higher photosynthetic efficiency (6-8%) than terrestrial biomass (1.8-2.2%), v) low consumption of water, vi) no alteration of human food supply, vii) no competition for arable land, viii) capacity of growing in a wide range of territories like saline water or wastewater, ix) absence or low lignin content; x) potential to obtain high-added value products (cosmetics, drugs, pigments, biofertilizers, food additives…) and xi) ability to achieve larger production rates of biomass than land-based feedstock (in terms of land surface employed) (Rodríguez-Jasso et al, 2013;Ruiz et al, 2013;Sirajunnisa and Surendhiran, 2016). In a recent study, the US Energy Department has estimated (under specific conditions) that the biofuel productivity from seaweed is two and five-fold higher than ethanol productivity obtained from sugarcane and corn, respectively (Soliman et al, 2018).…”