Food Waste to Bioenergy

Liu, Xueyan; Ding, Hong-Bo; Wang, Jing‐Yuan

doi:10.1061/9780784410899.ch03

Cited by 5 publications

(3 citation statements)

References 69 publications

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“…A novel biogas production method called Biopercolat vised, employing a two-step anaerobic digestion process, including a hydrolysis c with axial mixing and a methanogenic chamber [41]. The Biotechnische Abfallver (BTA) system utilizes a hydrocyclone for solid or liquid separation after which t fraction is mixed with pretreated leachate and then pumped into a hydrolysis ta The dual-stage digester configuration facilitates a faster attainment of stability co to single-stage reactors [43]. Nonetheless, there are certain drawbacks associated w lizing a two-stage system, including the accumulation of hydrogen that can imp growth of acid-forming bacteria, reduced stability of biomass, technical complex storage limitations, as well as increased operational expenses [44].…”

Section: Classification and Commercial Systems Of Hs-admentioning

confidence: 99%

Mass Transfer Enhancement in High-Solids Anaerobic Digestion of Organic Fraction of Municipal Solid Wastes: A Review

Gao,

Li,

Wang

et al. 2023

Bioengineering

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The increasing global population and urbanization have led to a pressing need for effective solutions to manage the organic fraction of municipal solid waste (OFMSW). High-solids anaerobic digestion (HS-AD) has garnered attention as a sustainable technology that offers reduced water demand and energy consumption, and an increased biogas production rate. However, challenges such as rheology complexities and slow mass transfer hinder its widespread application. To address these limitations, this review emphasizes the importance of process optimization and the mass transfer enhancement of HS-AD, and summarizes various strategies for enhancing mass transfer in the field of HS-AD for the OFMSW, including substrate pretreatments, mixing strategies, and the addition of biochar. Additionally, the incorporation of innovative reactor designs, substrate pretreatment, the use of advanced modeling and simulation techniques, and the novel conductive materials need to be investigated in future studies to promote a better coupling between mass transfer and methane production. This review provides support and guidance to promote HS-AD technology as a more viable solution for sustainable waste management and resource recovery.

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Section: Classification and Commercial Systems Of Hs-admentioning

confidence: 99%

Mass Transfer Enhancement in High-Solids Anaerobic Digestion of Organic Fraction of Municipal Solid Wastes: A Review

Gao,

Li,

Wang

et al. 2023

Bioengineering

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“…The VFAs produced by biological approaches has variety of applications. They can be utilised for the production of poly-hydroxyalkanoate (biodegradable plastics) (Mengmeng et al 2009), generation of bioenergy such as electricity (Liu et al 2004), hydrogen and biogas production, and biological nutrient removal (Lee et al 2014). Figure 4 show the different application of the VFAs.…”

Section: Application Of Volatile Fatty Acidsmentioning

confidence: 99%

Effect of Hydrothermal Pretreatment on the Acidification of Thickened Waste Activated Sludge and Source Separated Organics

Kakar¹

2022

Preprint

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The objective of this study was to investigate the impact of the hydrothermal pre-treatment (HTP) on solubilization and acidification of thickened waste activated sludge (TWAS) and source separated organics (SSO). The temperatures, retention times, and pressures used in this study ranges were 150-240°C, 5-30 min, and 69-488 psi, respectively. Mesophilic batch acidification tests were conducted for all pretreated and non-pretreated samples. For the TWAS, the highest overall COD solubilization due to HTP and acidification of 64% was observed at “200°C-10 min” compared to 30% for raw TWAS. The highest VFAs yield of 2856 mg VFAs/g VSS added was observed at “190°C-10 min” compared to 1251 for raw TWAS. For the SSO, the highest overall COD solubilization of 63% was observed at “210°C-20 min” compared to 17% for raw SSO. The highest VFAs yield of 1536 mg VFAs/g VSS added was observed at “210°C-20 min” compared to 768 for raw SSO.

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“…The VFAs produced by biological approaches have a variety of applications. They can be utilized for the production of polyhydroxyalkanoate (biodegradable plastics)(Mengmeng et al, 2009), generation of bioenergy such as electricity(Liu et al 2004), hydrogen and biogas production, and biological nutrient removal(Lee et al, 2014a).Figure 2.2 show the different…”

mentioning

confidence: 99%

Application of Hydrothermal Pretreatment for Improving the Fermentation and Anaerobic Digestion Processes for Resource Recovery from Municipal Solid Waste

Kakar

2024

Preprint

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<p>This thesis comprehensively investigated the hydrothermal pretreatment (HTP) parameters' impact on the sludge disintegration, volatile fatty acid (VFA), and methane production. It has also studied different process configurations and the development of a novel thermal-hydrolysis and vacuum fermentation for high-grade VFA recovery. Results confirmed the significant impact of HTP on all process parameters and a direct correlation between the retention time, sludge pH, and solid content with process parameters. The highest COD solubilization and solid destruction percentage were observed for the retention time of 30 minutes, pH 10, and solid content (SC) of 10%. It was found that fermentative bacteria prefer consuming sludge with lower solid content while methanogenesis produced higher methane consuming sludge with SC of 16%. The combination of thermal hydrolysis with chemical pretreatments also played a crucial role in resource recovery. Combining free nitrous acid and thermal hydrolysis demonstrated the highest methane production efficiency compared to the combination with typical acetic acid and sodium hydroxide. Moreover, the impact of HTP parameters on mesophilic and thermophilic fermentation was investigated and ultimately, 10-15% higher solubilization and VFA production occurred during thermophilic fermentation compared to mesophilic. Further, different process configurations of HTP with fermentation and anaerobic digestion were examined while hydrothermal pretreatment was found to have superior results for COD solubilization (25.5%), VFA production (65 g Acetate/L), and methane production (230 mL CH /g 4COD added) compared to the hydrothermal inter-treatment (HIT). Mathematical models developed by incorporating more than 100 sample points from studies mentioned above further defined the correlation of HTP and process response parameters. The best conditions of HTP from observations in the first phase were utilized to pretreat TWAS for the next phase. The pretreated TWAS and PS mixture was then used as the substrate of the novel integrated thermal hydrolysis and vacuum fermentation. Vacuum fermentation integrated with HTP demonstrated the highest (45%), VFA yield (0.32 g COD/g VSS added), and methane yield (267 mL CH4/g TCOD added) compared to the systems without pretreatment and vacuum. Microbial community analysis confirmed that HTP and vacuum application significantly impact the bacterial community's diversity. A bigger population of fermenters such as coprothermobacteraeota was observed in vacuum systems and for pretreated samples.</p>

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Food Waste to Bioenergy

Cited by 5 publications

References 69 publications

Mass Transfer Enhancement in High-Solids Anaerobic Digestion of Organic Fraction of Municipal Solid Wastes: A Review

Mass Transfer Enhancement in High-Solids Anaerobic Digestion of Organic Fraction of Municipal Solid Wastes: A Review

Effect of Hydrothermal Pretreatment on the Acidification of Thickened Waste Activated Sludge and Source Separated Organics

Application of Hydrothermal Pretreatment for Improving the Fermentation and Anaerobic Digestion Processes for Resource Recovery from Municipal Solid Waste

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