Recent progress in microalgal biomass production coupled with wastewater treatment for biofuel generation

Salama, El-Sayed; Kurade, Mayur B.; Abou-Shanab, Reda A.I.; El-Dalatony, Marwa M.; Yang, Il Seung; Min, Booki

doi:10.1016/j.rser.2017.05.091

Cited by 381 publications

(104 citation statements)

References 163 publications

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“…Maximizing the bioavailability of fermentable biomass components is a key challenge in biomass pretreatment due to the loss of sugars during conventional pretreatment approaches [55]. Pretreatment of fruit peels and wastes (FPWs) with dilute acetic acid helped maximize sugar recovery (99.9%) under the optimized conditions (0.2 M acetic acid, 100 • C, 1 h) at 10% substrate loading [56].…”

Section: Chemical Pretreatmentmentioning

confidence: 99%

Utilization of Microalgal Biofractions for Bioethanol, Higher Alcohols, and Biodiesel Production: A Review

et al. 2017

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Abstract:Biomass is a crucial energy resource used for the generation of electricity and transportation fuels. Microalgae exhibit a high content of biocomponents which makes them a potential feedstock for the generation of ecofriendly biofuels. Biofuels derived from microalgae are suitable carbon-neutral replacements for petroleum. Fermentation is the major process for metabolic conversion of microalgal biocompounds into biofuels such as bioethanol and higher alcohols. In this review, we explored the use of all three major biocomponents of microalgal biomass including carbohydrates, proteins, and lipids for maximum biofuel generation. Application of several pretreatment methods for enhancement the bioavailability of substrates (simple sugar, amino acid, and fatty acid) was discussed. This review goes one step further to discuss how to direct these biocomponents for the generation of various biofuels (bioethanol, higher alcohol, and biodiesel) through fermentation and transesterification processes. Such an approach would result in the maximum utilization of biomasses for economically feasible biofuel production.

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Section: Chemical Pretreatmentmentioning

confidence: 99%

Utilization of Microalgal Biofractions for Bioethanol, Higher Alcohols, and Biodiesel Production: A Review

et al. 2017

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“…Rock reservoir in subsurface energy resources is under triaxial stress condition, and hydraulic fracking is used to generate fluid transport path for the production of hydrocarbon and geothermal energy [1]. Recent studies suggest that some additives or supercritical CO 2 could be used in enhanced geothermal systems to improve energy extraction [1,2]. The reactive ions in the fluid could cause fluid-rock interaction in rock materials [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Creep Strain and Permeability Evolution in Cracked Granite Subjected to Triaxial Stress and Reactive Flow

Zhang

Zhao

et al. 2018

Geofluids

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Fluid flow and fluid-rock interaction mainly take place in fracture network, consequently resulting in deformation and permeability variation of rock and deterioration of the wellbore performance. Mechanical-reactive flow coupling creep tests are performed on cracked granite under various confining pressures and acid and alkaline solution flows. The testing results show that the confining pressure and solution pH significantly influence the creep deformation, creep strain rate, and permeability. A primary creep stage and secondary creep stage are observed in all creep tests in this study; notably, the sample under a confining pressure of 10 MPa and acid solution injection undergoes creep failure for over 2700 hours. The acid solution has a more obvious influence on the creep behavior than that of the alkaline solution. With an increase in confining pressure, the total creep strain and creep strain rate in the samples gradually decrease during the injection of either solution. The permeability of the samples injected with either solution gradually deceases during the testing process, and this deceasing rate increases with the confining pressure. The scanning electron microscopy observations on the crack surfaces after the creep tests show that the surfaces of the fractures injected with the acid solution are smooth due to the dissolution of the matrix, while those injected with the alkaline solution include voids due to the dissolution of quartz. These experimental results could improve the understanding of the long-term transport and mechanical behaviors of wellbore.

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“…. Moreover, algae can sequester biogenic CO 2 produced by bacteria, producing a valuable biomass feedstock which can be converted to biofuels (Salama et al, 2017), biofertilizers (Mulbry, Westhead, Pizarro, & Sikora, 2005), or animal feed (Cole et al, 2016), thereby displacing emissions from petroleum fuels or crop production. In this manner, algal treatment systems have the potential to make wastewater treatment a "carbon negative" process.…”

mentioning

confidence: 99%

Algal photosynthetic aeration increases the capacity of bacteria to degrade organics in wastewater

Holmes

Paddock

VanderGheynst

et al. 2019

Biotech & Bioengineering

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Wastewater treatment is an energy‐intensive process and a net emitter of greenhouse gas emissions. A large fraction of these emissions is due to intensive aeration of aerobic bacteria to facilitate break‐down of organic compounds. Algae can generate dissolved oxygen at levels in excess of saturation, and therefore hold the potential to partially displace or complement mechanical aeration in wastewater treatment processes. The objective of this study was to develop an internally consistent experimental and modeling approach to test the hypothesis that algal photosynthetic aeration can speed the removal of organic constituents by bacteria. This framework was developed using a simplified wastewater treatment process consisting of a model bacteria (Escherichia coli), a model algae (Auxenochlorella protothecoides), and a single carbon source that was consumable by bacteria only. This system was then tested both with and without the presence of algae. A MATLAB model that considered mass transfer and biological kinetics was used to estimate the production and consumption of O2 and CO2 by algae and bacteria. The results indicated that the presence of algae led to 18–66% faster removal of COD by bacteria, and that roughly one‐third of biochemical oxygen demand was offset by algal photosynthetic aeration.

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Recent progress in microalgal biomass production coupled with wastewater treatment for biofuel generation

Cited by 381 publications

References 163 publications

Utilization of Microalgal Biofractions for Bioethanol, Higher Alcohols, and Biodiesel Production: A Review

Utilization of Microalgal Biofractions for Bioethanol, Higher Alcohols, and Biodiesel Production: A Review

Creep Strain and Permeability Evolution in Cracked Granite Subjected to Triaxial Stress and Reactive Flow

Algal photosynthetic aeration increases the capacity of bacteria to degrade organics in wastewater

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