Cultivation of microalgae in adjusted wastewater to enhance biofuel production and reduce environmental impact: Pyrolysis performances and life cycle assessment

Li, Gang; Hu, Ruichen; Wang, Nan; Yang, Tenglun; Xu, Fuzhuo; Li, Jiale; Wu, Jiahui; Huang, Zhigang; Pan, Minmin; Lyu, Tao

doi:10.1016/j.jclepro.2022.131768

Cited by 73 publications

(28 citation statements)

References 46 publications

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“…The evaluation details four aspects of environmental impact, including photochemical ozone synthesis (kg VOC, CO, CH 4 -eq), acidification (kg SO 2 , NO X -eq), eutrophication (kg PO 4 , NO X -eq), and global warming (kg CO 2 , CH 4 , NO X , CO-eq) [ 31 ]. The energy consumption and environmental impact was determined using 1 kg biomass dry weight EJ 8–10 residue for assessment.…”

Section: Methodsmentioning

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: Methodsmentioning

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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Cultivation of microalgae in adjusted wastewater to enhance biofuel production and reduce environmental impact: Pyrolysis performances and life cycle assessment

Cited by 73 publications

References 46 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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