Valorisation of microalgae residues after lipid extraction: Pyrolysis characteristics for biofuel production

Huang, Zhigang; Zhang, Jiang; Pan, Minmin; Hao, Yuhang; Hu, Ruichen; Xiao, Wenbo; Li, Gang; Lyu, Tao

doi:10.1016/j.bej.2021.108330

Cited by 63 publications

(17 citation statements)

References 47 publications

(66 reference statements)

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“…Besides the biofuel generation from microalgal biomass, the environmental impact of the pyrolysis process needs to be assessed to identify any trade-offs [ 11 ]. Some drawbacks have been reported; for example, the relative contents of nitrogen compounds in the residues of defatted microalgae could increase during the pyrolysis [ 12 ]. Furthermore, the addition of a catalyst would increase the contents of CO in pyrolysis products of Haematococcus pluvialis residues [ 13 ].…”

Section: Introductionmentioning

confidence: 99%

Enhancing Bioenergy Production from the Raw and Defatted Microalgal Biomass Using Wastewater as the Cultivation Medium

Hao

Yang

et al. 2022

Bioengineering

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Improving the efficiency of using energy and decreasing impacts on the environment will be an inevitable choice for future development. Based on this direction, three kinds of medium (modified anaerobic digestion wastewater, anaerobic digestion wastewater and a standard growth medium BG11) were used to culture microalgae towards achieving high-quality biodiesel products. The results showed that microalgae culturing with anaerobic digestate wastewater could increase lipid content (21.8%); however, the modified anaerobic digestion wastewater can boost the microalgal biomass production to 0.78 ± 0.01 g/L when compared with (0.35–0.54 g/L) the other two groups. Besides the first step lipid extraction, the elemental composition, thermogravimetric and pyrolysis products of the defatted microalgal residues were also analysed to delve into the utilisation potential of microalgae biomass. Defatted microalgae from modified wastewater by pyrolysis at 650 °C resulted in an increase in the total content of valuable products (39.47%) with no significant difference in the content of toxic compounds compared to other groups. Moreover, the results of the life cycle assessment showed that the environmental impact (388.9 mPET2000) was lower than that of raw wastewater (418.1 mPET2000) and standard medium (497.3 mPET2000)-cultivated groups. Consequently, the method of culturing microalgae in modified wastewater and pyrolyzing algal residues has a potential to increase renewable energy production and reduce environmental impact.

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Section: Introductionmentioning

confidence: 99%

Enhancing Bioenergy Production from the Raw and Defatted Microalgal Biomass Using Wastewater as the Cultivation Medium

Hao

Yang

et al. 2022

Bioengineering

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“…Second-generation biomass such as agricultural waste could be an alternative resource to first-generation biomass for producing biofuels. Microalgae belongs to third-generation biomass, and it is often utilized as the feedstocks for biodiesel production owing to its high concentration of lipids [5,6].…”

Section: Introductionmentioning

confidence: 99%

Hydrothermal Carbonization of Spent Coffee Grounds for Producing Solid Fuel

Gallant

Salaudeen

et al. 2022

Sustainability

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Spent coffee grounds (SCG) are industrial biowaste resulting from the coffee-brewing process, and they are often underutilized and end up in landfills, thereby leading to the emission of toxic gases and environmental damage. Hydrothermal carbonization (HTC) is an attractive approach to valorize wet biomass such as SCG to valuable bioproducts (i.e., hydrochar). Thus, in this work, the HTC of SCG was carried out in a 500 L stainless steel vessel at 150, 170, 190, 210, and 230 °C for 30 min, 60 min, 90 min, and 120 min and a feedstock to water weight ratio of 1:5, 1:10, and 1:15, and the use of the resulting hydrochar as a solid fuel was evaluated. The results showed that a high energy recovery (83.93%) and HHV (23.54 MJ/kg) of hydrochar was obtained at moderate conditions (150 °C, 30 min, and feedstock to water weight ratio of 1:5) when compared with conventional approaches such as torrefaction. Following this, the surface morphology, functionality, and combustion behavior of this hydrochar were characterized by SEM, FTIR, and TGA, respectively. In short, it can be concluded that HTC is an effective approach for producing solid fuel from SCG and the resulting hydrochar has the potential to be applied either in domestic heating or large-scale co-firing plants.

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“…The incomplete combustion of biomass has also been a source of indoor pollution. 29–32 The pollution created by burning biomass badly in traditional stoves includes carbon monoxide, PM 2.5 and black carbon. 33 These health and environmental challenges can be reduced by using modern, efficient stoves with greatly reduced emission factors.…”

Section: Introductionmentioning

confidence: 99%

Comparative evaluation of thermal and emission performances for improved commercial coal-fired stoves in China

et al. 2022

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Valorisation of microalgae residues after lipid extraction: Pyrolysis characteristics for biofuel production

Cited by 63 publications

References 47 publications

Enhancing Bioenergy Production from the Raw and Defatted Microalgal Biomass Using Wastewater as the Cultivation Medium

Enhancing Bioenergy Production from the Raw and Defatted Microalgal Biomass Using Wastewater as the Cultivation Medium

Hydrothermal Carbonization of Spent Coffee Grounds for Producing Solid Fuel

Comparative evaluation of thermal and emission performances for improved commercial coal-fired stoves in China

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