New Biofuel Alternatives: Integrating Waste Management and Single Cell Oil Production

Abstract

Concerns about greenhouse gas emissions have increased research efforts into alternatives in bio-based processes. With regard to transport fuel, bioethanol and biodiesel are still the main biofuels used. It is expected that future production of these biofuels will be based on processes using either non-food competing biomasses, or characterised by low CO2 emissions. Many microorganisms, such as microalgae, yeast, bacteria and fungi, have the ability to accumulate oils under special culture conditions. Microbial oils might become one of the potential feed-stocks for biodiesel production in the near future. The use of these oils is currently under extensive research in order to reduce production costs associated with the fermentation process, which is a crucial factor to increase economic feasibility. An important way to reduce processing costs is the use of wastes as carbon sources. The aim of the present review is to describe the main aspects related to the use of different oleaginous microorganisms for lipid production and their performance when using bio-wastes. The possibilities for combining hydrogen (H2) and lipid production are also explored in an attempt for improving the economic feasibility of the process.

Study of Holtermanniella wattica, Leucosporidium creatinivorum, Naganishia adeliensis, Solicoccozyma aeria, and Solicoccozyma terricola for their lipogenic aptitude from different carbon sources

“…In addition, the use of different carbon sources considerably affected Y L , DW, Y L /DW, Y L /carbon source, Y L /d (Table 2), and FA profile (Table 3), in agreement with current literature that reports that the type of carbon source has a great influence over growth rate, lipid yields, and fatty acids composition [51, 52]. …”

“…All C3, C5, C6, and C12 carbohydrates were selected for the study because they are representative of common sustainable biological waste, i.e., glycerol results from trans-esterification process for biodiesel production, xylose from hydrolysis of hemicellulosic residues, galactose from hydrolysis of whey lactose, sucrose from molasses, maltose from hydrolysis of wort from brewing processes, and cellobiose from lignocellulosic residues [11, 12, 51]. …”

Production ofBacillus amyloliquefaciensOG and its metabolites in renewable media: valorisation for biodiesel production andp-xylene decontamination

“…D r a f t 21 Therefore, the CO 2 produced from their burning can be recycled. However, the major source of lipids used in biodiesel production is from edible oils, therefore the production of biofuel from crops adds a pressure on the price of food in addition to cause deforestation in some regions (Martínez et al 2015). An alternative is the microbial production of biodiesel, which has been proven successful from oleaginous microrganisms such as microalgae, yeast and fungi (Meng et al 2009).…”

Avaliação do potencial do fungo filamentoso <i>Mucor circinelloides</i> como fonte de lipase e lipídios para a produção de biodiesel dentro do conceito de biorrefinaria

“…Nos últimos anos, as pesquisas de novas espécies produtoras de óleos, permitiram um melhor entendimento das vias metabólicas para a produção de lipídio microbiano e a otimização de processos de cultivo utilizando como substratos vários tipos de biomassas residuais (SITEPU et al, 2015;JIANG, 2015;MARTINEZ et al, 2015;). …”