Improving gaseous biofuel yield from seaweed through a cascading circular bioenergy system integrating anaerobic digestion and pyrolysis

Deng, Chen; Lin, Richen; Kang, Xueyan; Wu, Benteng; O’Shea, Richard; Murphy, Jerry D.

doi:10.1016/j.rser.2020.109895

Cited by 89 publications

(43 citation statements)

References 102 publications

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“…BMP ex BMP th × 100 (6) The modified Gompertz model; Equation (7) [52], was used to fit the BMP ex curves to describe the process kinetics. Where H m is the maximum biomethane yield (mL CH 4 /g VS), R m is the peak biomethane production rate (mL CH 4 /g VS/d), λ is the lag-phase time (d), t is time (d), and e = 2.71828.…”

Section: Bi (%) =mentioning

confidence: 99%

An Assessment of Different Integration Strategies of Hydrothermal Carbonisation and Anaerobic Digestion of Water Hyacinth

et al. 2020

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Water hyacinth (WH) is an invasive aquatic macrophyte that dominates freshwater bodies across the world. However, due to its rapid growth rate and wide-spread global presence, WH could offer great potential as a biomass feedstock, including for bioenergy generation. This study compares different integration strategies of hydrothermal carbonisation (HTC) and anaerobic digestion (AD) using WH, across a range of temperatures. These include (i) hydrochar combustion and process water digestion, (ii) hydrochar digestion, (iii) slurry digestion. HTC reactions were conducted at 150 °C, 200 °C, and 250 °C. Separation of hydrochars for combustion and process waters for digestion offers the most energetically-feasible valorisation route. However, hydrochars produced from WH display slagging and fouling tendencies; limiting their use in large-scale combustion. AD of WH slurry produced at 150 °C appears to be energetically-feasible and has the potential to also be a viable integration strategy between HTC and AD, using WH.

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Section: Bi (%) =mentioning

confidence: 99%

An Assessment of Different Integration Strategies of Hydrothermal Carbonisation and Anaerobic Digestion of Water Hyacinth

et al. 2020

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“…The integration of different units would allow a complete valorization of resources. This may be the case of integrating digestion and thermal processes, which recently has been subject to extensive research [144][145][146] since the thermal valorization of digested material increases the recovery of energy and valuable products [147,148]. Char obtained from pyrolysis may serve as an adsorbent agent in biogas upgrading [149,150], thus reducing operational costs.…”

mentioning

confidence: 99%

Biogas Production from Organic Wastes: Integrating Concepts of Circular Economy

Ellacuriaga

García-Cascallana

Gómez

2021

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Anaerobic digestion is traditionally used for treating organic materials. This allows the valorization of biogas and recycling of nutrients thanks to the land application of digestates. However, although this technology offers a multitude of advantages, it is still far from playing a relevant role in the energy market and from having significant participation in decarbonizing the economy. Biogas can be submitted to upgrading processes to reach methane content close to that of natural gas and therefore be compatible with many of its industrial applications. However, the high installation and operating costs of these treatment plants are the main constraints for the application of this technology in many countries. There is an urgent need of increasing reactor productivity, biogas yields, and operating at greater throughput without compromising digestion stability. Working at organic solid contents greater than 20% and enhancing hydrolysis and biogas yields to allow retention times to be around 15 days would lead to a significant decrease in reactor volume and therefore in initial capital investments. Anaerobic digestion should be considered as one of the key components in a new economy model characterized by an increase in the degree of circularity. The present manuscript reviews the digestion process analyzing the main parameters associated with digestion performance. The novelty of this manuscript is based on the link established between operating reactor conditions, optimizing treatment capacity, and reducing operating costs that would lead to unlocking the potential of biogas to promote bioenergy production, sustainable agronomic practices, and the integration of this technology into the energy grid.

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“…Despite these advantages of algae, when used as the feedstock in AD algae have shown to present a relatively low biomethane yield (the median value of SMY of seaweed is reported as 0.251 Nm 3 CH 4 /(kg·VS) and the median value of SMY of microalgae is reported as 0.32 Nm 3 CH 4 /(kg·VS) as shown in Figure 2 C). This is likely due to low C/N ratios (less than 15:1, ideally should be in the range of 20:1 to 35:1) ( Gómez-Camacho et al., 2021 ) and high salinity (10.4–11.0 g/L) ( Deng et al., 2020b ; Tabassum et al., 2016 ). Ammonia inhibition induced by high nitrogen content in algae could restrict microbial growth rate and be a critical constraint in long-term continuous AD reactors, resulting in low organic loading rates, large reactor volumes and long hydraulic retention times (HRTs), and ultimately lower methane yields ( Deng et al., 2020b ).…”

Section: Emerging Biomethane Production Technologiesmentioning

confidence: 99%

“…This is likely due to low C/N ratios (less than 15:1, ideally should be in the range of 20:1 to 35:1) ( Gómez-Camacho et al., 2021 ) and high salinity (10.4–11.0 g/L) ( Deng et al., 2020b ; Tabassum et al., 2016 ). Ammonia inhibition induced by high nitrogen content in algae could restrict microbial growth rate and be a critical constraint in long-term continuous AD reactors, resulting in low organic loading rates, large reactor volumes and long hydraulic retention times (HRTs), and ultimately lower methane yields ( Deng et al., 2020b ). Co-digestion of algae with higher C/N ratio substrates, such as sewage sludge or grass silage ( Ding et al., 2020 ; Tabassum et al., 2016 ), would be a cost-effective solution to generate an optimum mix for AD.…”

Section: Emerging Biomethane Production Technologiesmentioning

confidence: 99%

“…The nutrients concentration in dewatered sludge is going to decrease when recycling nutrients as fertilizer. Solid digestate can be used in a broad range of applications such as biofertilizer, fossil fuel replacement following combustion or pyrolysis, soil conditioner, and the raw material for biochar refining ( Deng et al., 2020a , 2020b ; Peng et al., 2020 ). Biochar can be added back to the AD reactor, in the form of electrodes or porous conductive materials, to accelerate the electron transfer process, thus enhancing methane yield in the integrated system ( Escobar et al., 2021 ).…”

Section: Comparison Of Ad-based Circular Cascading Systems In Four Plausible Future Scenariosmentioning

confidence: 99%

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Emerging bioelectrochemical technologies for biogas production and upgrading in cascading circular bioenergy systems

et al. 2021

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Biomethane is suggested as an advanced biofuel for the hard-to-abate sectors such as heavy transport. However, future systems that optimize the resource and production of biomethane have yet to be definitively defined. This paper assesses the opportunity of integrating anaerobic digestion (AD) with three emerging bioelectrochemical technologies in a circular cascading bioeconomy, including for power-to-gas AD (P2G-AD), microbial electrolysis cell AD (MEC-AD), and AD microbial electrosynthesis (AD-MES). The mass and energy flow of the three bioelectrochemical systems are compared with the conventional AD amine scrubber system depending on the availability of renewable electricity. An energy balance assessment indicates that P2G-AD, MEC-AD, and AD-MES circular cascading bioelectrochemical systems gain positive energy outputs by using electricity that would have been curtailed or constrained (equivalent to a primary energy factor of zero). This analysis of technological innovation, aids in the design of future cascading circular biosystems to produce sustainable advanced biofuels.

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Improving gaseous biofuel yield from seaweed through a cascading circular bioenergy system integrating anaerobic digestion and pyrolysis

Cited by 89 publications

References 102 publications

An Assessment of Different Integration Strategies of Hydrothermal Carbonisation and Anaerobic Digestion of Water Hyacinth

An Assessment of Different Integration Strategies of Hydrothermal Carbonisation and Anaerobic Digestion of Water Hyacinth

Biogas Production from Organic Wastes: Integrating Concepts of Circular Economy

Emerging bioelectrochemical technologies for biogas production and upgrading in cascading circular bioenergy systems

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