Valorization of food waste to multiple bio-energies based on enzymatic pretreatment: A critical review and blueprint for the future

Zou, Lianpei; Wan, Yulan; Zhang, Sitong; Luo, Jing; Li, Yu You; Liu, Jianyong

doi:10.1016/j.jclepro.2020.124091

Cited by 41 publications

(13 citation statements)

References 94 publications

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“…Hydrolysis is considered to be the rate-limiting step of anaerobic digestion (Zou et al 2020). The rate of hydrolysis depends on the nature and concentrations of organic fractions of kitchen waste.…”

Section: Pre-treatmentsmentioning

confidence: 99%

Anaerobic digestion and recycling of kitchen waste: a review

et al. 2022

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About 1.6 billion tons of food are wasted worldwide annually, calling for advanced methods to recycle food waste into energy and materials. Anaerobic digestion of kitchen waste allows the efficient recovery of energy, and induces low-carbon emissions. Nonetheless, digestion stability and biogas production are variables, due to dietary habits and seasonal diet variations that modify the components of kitchen waste. Another challenge is the recycling of the digestate, which could be partly solved by more efficient reactors of anaerobic digestion. Here, we review the bottlenecks of anaerobic digestion treatment of kitchen waste, with focus on components inhibition, and energy recovery from biogas slurry and residue. We provide rules for the optimal treatment of the organic fraction of kitchen waste, and guidelines to upgrade the anaerobic digestion processes. We propose a strategy using an anaerobic dynamic membrane bioreactor to improve anaerobic digestion of kitchen waste, and a model for the complete transformation and recycling of kitchen waste, based on component properties.

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Section: Pre-treatmentsmentioning

confidence: 99%

Anaerobic digestion and recycling of kitchen waste: a review

et al. 2022

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“…Crop residues and manures are the main sources of untreated or composted wastes applied to soils [131]. Other wastes require pre-treatment, by an increasing range of methods, including composting, anaerobic digestion, pyrolysis and gasification [132]. This is required to avoid immobilization of nutrients [106] and to reduce pathogen levels before application to the soil [132,133].…”

Section: Use Of Organic Wastes For Energymentioning

confidence: 99%

“…Other wastes require pre-treatment, by an increasing range of methods, including composting, anaerobic digestion, pyrolysis and gasification [132]. This is required to avoid immobilization of nutrients [106] and to reduce pathogen levels before application to the soil [132,133]. Therefore, use for energy provision of organic wastes that are not widely applied to crops (i.e.…”

Section: Use Of Organic Wastes For Energymentioning

confidence: 99%

The role of soils in provision of energy

Smith

Farmer

Smith

et al. 2021

Phil. Trans. R. Soc. B

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Soils have both direct and indirect impacts on available energy, but energy provision, in itself, has direct and indirect impacts on soils. Burning peats provides only approximately 0.02% of global energy supply yet emits approximately 0.7–0.8% of carbon losses from land-use change and forestry (LUCF). Bioenergy crops provide approximately 0.3% of energy supply and occupy approximately 0.2–0.6% of harvested area. Increased bioenergy demand is likely to encourage switching from forests and pastures to rotational energy cropping, resulting in soil carbon loss. However, with protective policies, incorporation of residues from energy provision could sequester approximately 0.4% of LUCF carbon losses. All organic wastes available in 2018 could provide approximately 10% of global energy supply, but at a cost to soils of approximately 5% of LUCF carbon losses; not using manures avoids soil degradation but reduces energy provision to approximately 9%. Wind farms, hydroelectric solar and geothermal schemes provide approximately 3.66% of energy supply and occupy less than approximately 0.3% of harvested area, but if sited on peatlands could result in carbon losses that exceed reductions in fossil fuel emissions. To ensure renewable energy provision does not damage our soils, comprehensive policies and management guidelines are needed that (i) avoid peats, (ii) avoid converting permanent land uses (such as perennial grassland or forestry) to energy cropping, and (iii) return residues remaining from energy conversion processes to the soil. This article is part of the theme issue ‘The role of soils in delivering Nature's Contributions to People’.

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“…In order to enhance the efficiencies of FW solubilization and hydrolysis to promote VFA generation, various methods, such as acid/alkaline, ultrasonic, microwave, or enzymatic pretreatments, have been widely conducted. , Among them, enzymatic pretreatment, which exhibited the advantages of high specificity and low energy consumption without secondary pollution, was reported to efficiently enhance the conversation of carbohydrates to glucose in FW (97.1% improvement efficiency compared with the unpretreated group) . Meanwhile, the enzymatic pretreatment was also able to reduce 64.1% volatile suspended solids (VSS) and 80.4% total suspended solids (TSS) of FW .…”

Section: Introductionmentioning

confidence: 99%

Enhanced Volatile Fatty Acid Production from Food Waste Fermentation via Enzymatic Pretreatment: New Insights into the Depolymerization and Microbial Traits

Zhu

et al. 2022

ACS EST Eng.

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Food waste (FW) has been considered a potential carbon reservoir and can be used for high-value volatile fatty acid (VFA) production via anaerobic fermentation. Nevertheless, more work is needed to unravel how to regulate the structural defects of FW and enhance microbial metabolisms for improving VFA production through pretreatment methods. This work investigated the enhancement of VFA production from FW fermentation through enhancing depolymerization and stimulating microbial traits via enzymatic pretreatment. The results exhibited that, after pretreatment, VFA production was improved by 50.1% compared to the unpretreated group, and the concentrations of bioavailable substrates (e.g., reducing sugar and soluble chemical oxygen demand) increased significantly. Further analysis proved that the enzymatic pretreatment could highly reduce the particle sizes of FW by 69.3% and thus promoted the solubilization of substrates and lipids. Meanwhile, the ratio of α-helix/(β-sheet + random coil) in the protein secondary structure of FW decreased from 0.32 to 0.23 after enzymatic pretreatment, indicating that the pretreatment process accelerated the FW depolymerization. Furthermore, the organic substrates after the pretreatment were favorable for enriching the bacteria involved in hydrolysis and acidification (e.g., Olsenella sp. and Sporanaerobacter sp.), upregulating the gene expressions involved in hydrolysis, pyruvate metabolism, and fatty acid biosynthesis (e.g., malZ, PK, accA, and accC), and stimulating the enzymatic activities involved in acetate and butyrate formation (e.g., AK, PTA, BK, and PTB), which was in accordance with the enhanced VFA generation from FW fermentation via enzymatic pretreatment.

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Valorization of food waste to multiple bio-energies based on enzymatic pretreatment: A critical review and blueprint for the future

Cited by 41 publications

References 94 publications

Anaerobic digestion and recycling of kitchen waste: a review

Anaerobic digestion and recycling of kitchen waste: a review

The role of soils in provision of energy

Enhanced Volatile Fatty Acid Production from Food Waste Fermentation via Enzymatic Pretreatment: New Insights into the Depolymerization and Microbial Traits

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