Browsing by Author "Mendonca, Henrique Vieira de"
Now showing 1 - 2 of 2
Results Per Page
Sort Options
- Biofuel recovery from microalgae biomass grown in dairy wastewater treated with activated sludge: the next step in sustainable productionPublication . Mendonca, Henrique Vieira de; Otenio, Marcelo Henrique; Marchão, Leonilde; Lomeu, Alice; Souza, Denise Salvador de; Reis, AlbertoABSTRACT: Microalgae biofuel could be the next step in avoiding the excessive use of fossil fuels and reducing negative impacts on the environment. In the present study, two species of microalgae (Scenedesmus obliquus and Chlorella vulgaris) were used for biomass production, grown in dairy wastewater treated by activated sludge systems. The photobioreactors were operated in batch and in continuous mode. The dry biomass produced was in the range of 2.30 to 3.10 g L-1. The highest volumetric yields for lipids and carbohydrates were 0.068 and 0.114 g L-1 day(-1). Maximum CO2 biofixation (750 mg L-1 day(-1)) was obtained in continuous mode. The maximum values for lipids (21%) and carbohydrates (39%) were recorded in the batch process with species Scenedesmus obliquus. In all of the experiments, the Linolenic acid concentration (C18:3) was greater than 12%, achieving satisfactory oxidative stability and good quality. Projected biofuel production could vary between 4,863,708 kg and 9,246,456 kg year(-1) if all the dairy wastewater produced in Brazil were used for this purpose. Two hectares would be needed to produce 24,99 x 10(9) L year(-1) of microalgae bioethanol, a far lower value than used in cultivating sugar cane. If all dairy wastewater generated annually in Brazil were used to produce microalgae biomass, it would be possible to obtain approximately 30,609 to 53,647 barrels of biodiesel per year. These data show that only by using dairy wastewater would biofuels be produced to replace 17% to 40% of the fossil fuels currently used in Brazil.
- Microalgae biomass production for biofuels in brazilian scenario : a critical reviewPublication . Santos, Marcela Granato Barbosa dos; Duarte, Renata Lopes; Martins Maciel, Alyne; Abreu, Mariana; Reis, Alberto; Mendonca, Henrique Vieira deABSTRACT: The Brazilian environmental, economic, and social conditions for the long-term establishment of mass culture of microalgae for either biofuel production or greenhouse gases (GHG) abatement are described in detail. A brief historical introduction of the microalgal biotechnology is presented followed by a compilation of Brazilian published research works on microalgae, with special emphasis on microalgal Brazilian biodiversity and applied phycology. Several case studies on Brazilian microalgal biorefineries are presented with special emphasis on wastewater (WW) treatment. The manuscript also adds valuable new information about which regions of the country offer better growing conditions for dozens of endemic species. Favorable climatic and environmental conditions for the cultivation of several microalgae (green) and cyanobacteria species in specific regions of the country are suggested. Finally, based on realistic biomass productivities and product yields for the Brazilian context, several scenarios for biofuel production and/or carbon dioxide (CO2) abatement have been designed, and results are presented and critically discussed. Brazilian self-sufficiency on either fuels for transportation or GHG abatement using exclusively microalgae is quite challenging but achievable accordingly with the present state of the art.