Biomass pyrolysis with alkaline-earth-metal additive for co-production of bio-oil and biochar-based soil amendment

Shen, Yafei; Yu, Shili; Yuan, Rui; Wang, Pu

doi:10.1016/j.scitotenv.2020.140760

Cited by 48 publications

(17 citation statements)

References 46 publications

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“…The alkaline-earth metals or the transition metals played a crucial role in the behavior of biomass pyrolysis [ 31 , 32 , 33 , 34 ]. Therefore, the removal of ash affected the pyrolysis behaviors of the microalgae.…”

Section: Discussionmentioning

confidence: 99%

Pyrolysis of High-Ash Natural Microalgae from Water Blooms: Effects of Acid Pretreatment

Liu

Wang

et al. 2021

Toxins

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Natural microalgae (NA, cyanobacteria) collected from Taihu Lake (Jiangsu, China) were used for biofuel production through pyrolysis. The microalgae were de-ashed via pretreatment with deionized water and hydrochloric acid, and the samples obtained were noted as 0 M, 0.1 M, 1 M, 2 M, 4 M, 6 M, 8 M, respectively, according to the concentration of hydrochloric acid used in the pretreatment. Pyrolysis experiments were carried out at 500 °C for 2 h. The products were examined by various techniques to identify the influence of the ash on the pyrolysis behavior. The results showed that the ash inhibited the thermal transformation of microalgae. The 2 mol/L hydrochloric acid performed the best in removing ash and the liquid yield increased from 34.4% (NA) to 40.5% (2 M). Metal-oxides (mainly CaO, MgO, Al2O3) in ash promoted the reaction of hexadecanoic acid and NH3 to produce more hexadecanamide, which was further dehydrated to hexadecanenitrile. After acid pretreatment, significant improvement in the selectivity of hexadecanoic acid was observed, ranging from 22.4% (NA) to 58.8% (4 M). The hydrocarbon compounds in the liquid product increased from 12.90% (NA) to 26.67% (2 M). Furthermore, the acid pretreatment enhanced the content of C9–C16 compounds and the HHV values of bio-oil. For natural microalgae, the de-ashing pretreatment before pyrolysis was essential for improving the biocrude yield and quality, as well as the biomass conversion efficiency.

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Section: Discussionmentioning

confidence: 99%

Pyrolysis of High-Ash Natural Microalgae from Water Blooms: Effects of Acid Pretreatment

Liu

Wang

et al. 2021

Toxins

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“…As the other processes described earlier, the products that are formed as a result of pyrolysis significantly depend on the biomass, reaction conditions, and feedstocks used. Bio-oil, which is formed as a pyrolysis result, can easily be upgraded into higher grade fuel and can be used for various applications [82]. Biochar is a valuable product formed from pyrolysis and has seen growth in applications such as improving soil retention, soil amendment, catalyst, carbon sequestration [82] and, hence, learning and gaining knowledge of production of biochar is of great interest.…”

Section: Pyrolysismentioning

confidence: 99%

“…Bio-oil, which is formed as a pyrolysis result, can easily be upgraded into higher grade fuel and can be used for various applications [82]. Biochar is a valuable product formed from pyrolysis and has seen growth in applications such as improving soil retention, soil amendment, catalyst, carbon sequestration [82] and, hence, learning and gaining knowledge of production of biochar is of great interest. Use of biochar as soil amendment has shown promising results in the agricultural field and, hence, different types of biochars and different type of preparation techniques are studied in order to obtain the most effective biochar, which is capable of increasing soil nutrient availability, porosity, fertility, etc.…”

Section: Pyrolysismentioning

confidence: 99%

“…Use of biochar as soil amendment has shown promising results in the agricultural field and, hence, different types of biochars and different type of preparation techniques are studied in order to obtain the most effective biochar, which is capable of increasing soil nutrient availability, porosity, fertility, etc. [82]. Biomass with higher calcium oxide (lime) content when heated at temperature above 450 • C results in biochar with low amounts of oxygen functional groups and increased stability [82].…”

Section: Pyrolysismentioning

confidence: 99%

“…[82]. Biomass with higher calcium oxide (lime) content when heated at temperature above 450 • C results in biochar with low amounts of oxygen functional groups and increased stability [82]. Further use of additives, such as phosphorus, zinc, iron, etc., during pyrolysis also modify biochar and, hence, expands its applications in various fields [83][84][85].…”

Section: Pyrolysismentioning

confidence: 99%

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Biochar as an Eco-Friendly and Economical Adsorbent for the Removal of Colorants (Dyes) from Aqueous Environment: A Review

Srivatsav¹,

Bhargav²,

Shanmugasundaram³

et al. 2020

Water

177

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Dyes (colorants) are used in many industrial applications, and effluents of several industries contain toxic dyes. Dyes exhibit toxicity to humans, aquatic organisms, and the environment. Therefore, dyes containing wastewater must be properly treated before discharging to the surrounding water bodies. Among several water treatment technologies, adsorption is the most preferred technique to sequester dyes from water bodies. Many studies have reported the removal of dyes from wastewater using biochar produced from different biomass, e.g., algae and plant biomass, forest, and domestic residues, animal waste, sewage sludge, etc. The aim of this review is to provide an overview of the application of biochar as an eco-friendly and economical adsorbent to remove toxic colorants (dyes) from the aqueous environment. This review highlights the routes of biochar production, such as hydrothermal carbonization, pyrolysis, and hydrothermal liquefaction. Biochar as an adsorbent possesses numerous advantages, such as being eco-friendly, low-cost, and easy to use; various precursors are available in abundance to be converted into biochar, it also has recyclability potential and higher adsorption capacity than other conventional adsorbents. From the literature review, it is clear that biochar is a vital candidate for removal of dyes from wastewater with adsorption capacity of above 80%.

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Valuable Biofuel Production via Pyrolysis Process of Olive Pomace over Alkali and Transition Metal Oxides Catalysts Supported on Activated Biochar

2022

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Non-catalytic and catalytic pyrolysis of olive pomace as the second generation of biomass has been investigated for the production of valuable biofuels. Bio-oil from the pyrolysis of olive pomace has high amounts of oxygenated compounds, therefore in this study, NiO, CoO, MgO and CaO catalysts supported on the activated biochar were used to upgrade the bio-oil via the deoxygenation process. The results indicated that the maximum bio-oil production yield through noncatalytic process was 56 wt. % at a temperature of 500 °C, which mainly includes oxygenated compounds with content more than 90 wt. %. Production of hydrocarbons, ketones and aldehydes through catalytic pyrolysis process of olive pomace over alkali metal oxides catalysts confirm occurrence of the decarboxylation, decarbonylation, ketonization and aldol condensation reactions. MgO/biochar and CaO/biochar catalysts represented similar performance in the conversion of fatty acids, but the CaO/biochar deoxygenation performance was better than MgO/biochar catalyst. Catalytic pyrolysis investigations indicated that transition metal oxides (NiO and Co 3 O 4 / biochar) catalysts represent higher deoxygenation activity than alkali metal oxides catalysts.

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Biomass pyrolysis with alkaline-earth-metal additive for co-production of bio-oil and biochar-based soil amendment

Cited by 48 publications

References 46 publications

Pyrolysis of High-Ash Natural Microalgae from Water Blooms: Effects of Acid Pretreatment

Pyrolysis of High-Ash Natural Microalgae from Water Blooms: Effects of Acid Pretreatment

Biochar as an Eco-Friendly and Economical Adsorbent for the Removal of Colorants (Dyes) from Aqueous Environment: A Review

Valuable Biofuel Production via Pyrolysis Process of Olive Pomace over Alkali and Transition Metal Oxides Catalysts Supported on Activated Biochar

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