Experimental investigation of wastewater microalgae in a pilot-scale downdraft gasifier

Soares, Renan Barroso; Martins, Márcio Ferreira; Gonçãlves, Ricardo Franci

doi:10.1016/j.algal.2020.102049

Cited by 12 publications

(5 citation statements)

References 42 publications

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“…As a result, the search for alternative sources of energy has become a serious issue. Currently, conventional fuels are employed in conjunction with renewable energy sources in several applications [9].…”

Section: Global Energy Statusmentioning

confidence: 99%

“…In this experimental investigation, we evaluated the performance of a downdraft gasifier using three different biomass fuels: wood chips, rice husks, and sugarcane bagasse. [3][4][5][6][7][8][9] The gasifier performance was evaluated in terms of gas composition, tar content, and carbon conversion efficiency. The results showed that the gas composition varied slightly with different biomass fuels, with hydrogen being the main component in all cases.…”

Section: Fig 3: Assessing the Efficiency Of Carbon Conversion In Down...mentioning

confidence: 99%

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Experimental Investigation of Downdraft Gasifier Using Different Biomass Fuels

2024

IJPREMS

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In a study, methane and carbon dioxide were generated through downdraft fixed-bed gasification, converting rice husks, waste plastic, and sawdust. The heat potential in biomass is crucial for synthetic gas production, and waste plastic, with the highest heating value at 40 MJ/kg, offers superior potential for high hydrogen concentration in synthetic gas (3-18% by volume) compared to rice husk and sawdust. Rice husk yields lower hydrogen and methane concentrations than sawdust. Gasification efficiency and output depend on the gasifier type, with downdraft fixed-bed gasifiers being highly effective. The gasification process's outcomes rely on factors like reactor temperature, catalyst exposure time, residence time, and catalyst heating temperature. This process transforms biomass into synthetic gas, which can power internal combustion engines and facilitate cogeneration for both electricity and heat. Biomass gasification shares similarities with coal gasification, yielding similar by-product gases during thermal breakdown but with less stringent operating requirements. Rice husk, waste plastic, and sawdust are fed into a downdraft fixed-bed gasifier, and synthetic gas is collected at the exhaust end. Analysing synthetic gases involves gas analysers, and this gas can drive engines, boilers, and machinery. Additionally, a MATLAB code snippet integrated into a Gasifier simulation GUI application enables users to visualize performance metrics, aiding understanding and optimization of gasifier dynamics for educational and practical purposes.

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Section: Global Energy Statusmentioning

confidence: 99%

Section: Fig 3: Assessing the Efficiency Of Carbon Conversion In Down...mentioning

confidence: 99%

Experimental Investigation of Downdraft Gasifier Using Different Biomass Fuels

2024

IJPREMS

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“…Aquatic algae were firstly valorized in World War II, where green algae were cultivated as a protein supplement [24]. Recently, their use has been extended to produce various biofuels, e.g., bio-methane via anaerobic digestion (AD) [25,26], bio-oil via pyrolysis [27], and hydrothermal liquefaction [28], syngas via gasification [29], solid fuel for power generation (with normal drying [30] or torrefaction [31]), bio-ethanol via fermentation [32], bio-hydrogen via dark fermentation [33], and biodiesel via in situ transesterification [34,35]. Apart from the biofuel, microalgae biorefinery is reported with the possibility of value added product and the importance towards the food and pharmaceutical sector [36].…”

Section: Literature Reviewmentioning

confidence: 99%

From microalgae to bioenergy: Identifying optimally integrated biorefinery pathways and harvest scheduling under uncertainties in predicted climate

Lim¹,

Teng²,

How³

et al. 2022

Renewable and Sustainable Energy Reviews

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“…Microalgae-based systems are being largely adopted in full-scale WWTPs, and the potential of microalgae biomass as feedstock for biofuels is very appealing due to their higher heating values and rapid growth rate. Microalgae gasification using compact microgeneration systems was successfully explored at pilot-scale as an alternative for the microgeneration of energy in WWTPs [ 84 ]. A commercial downdraft gasifier was used, and the best performance obtained a syngas production rate of 2.8 Nm 3 /kg biomass dry, with a syngas composition of 11.9% H 2 , 19.5% CO, 8.5% C x H y and 9.8% CO 2 .…”

Section: Energymentioning

confidence: 99%

Wastewater Valorization: Practice around the World at Pilot- and Full-Scale

Duque

Campo

Río

et al. 2021

IJERPH

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Over the last few years, wastewater treatment plants (WWTPs) have been rebranded as water resource recovery facilities (WRRFs), which recognize the resource recovery potential that exists in wastewater streams. WRRFs contribute to a circular economy by not only producing clean water but by recovering valuable resources such as nutrients, energy, and other bio-based materials. To this aim, huge efforts in technological progress have been made to valorize sewage and sewage sludge, transforming them into valuable resources. This review summarizes some of the widely used and effective strategies applied at pilot- and full-scale settings in order to valorize the wastewater treatment process. An overview of the different technologies applied in the water and sludge line is presented, covering a broad range of resources, i.e., water, biomass, energy, nutrients, volatile fatty acids (VFA), polyhydroxyalkanoates (PHA), and exopolymeric substances (EPS). Moreover, guidelines and regulations around the world related to water reuse and resource valorization are reviewed.

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Experimental investigation of wastewater microalgae in a pilot-scale downdraft gasifier

Cited by 12 publications

References 42 publications

Experimental Investigation of Downdraft Gasifier Using Different Biomass Fuels

Experimental Investigation of Downdraft Gasifier Using Different Biomass Fuels

From microalgae to bioenergy: Identifying optimally integrated biorefinery pathways and harvest scheduling under uncertainties in predicted climate

Wastewater Valorization: Practice around the World at Pilot- and Full-Scale

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