Biogas from Algae via Anaerobic Digestion

Uggetti, Enrica; Passos, Fabiana; Solé, María; Ferrer, Ivet

doi:10.1007/978-3-319-12334-9_11

Cited by 5 publications

(4 citation statements)

References 72 publications

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“…147 Critical evaluation of biomasses, such as algae, wood, hay, and sewage sludge, for biomethane production identified the green algal biomass as the most promising source for producing biomethane. 169 Pretreating the biomass with heat has been found to boost the biomethane production. In comparison to untreated biomass of Chlorella sp., heating of biomass at 90 °C for 0.5 h increased the biomethane production from 37 to 48%, respectively.…”

Section: Microalgae As a Source For Producing Various Forms Of Bioenergymentioning

confidence: 99%

“…Methane (CH 4 ) and CO 2 constitute the majority portion of biogas, with concentrations of around 55–75 and 25–45%, respectively, that emerge from the anaerobic fermentation of biomass . Critical evaluation of biomasses, such as algae, wood, hay, and sewage sludge, for biomethane production identified the green algal biomass as the most promising source for producing biomethane . Pretreating the biomass with heat has been found to boost the biomethane production.…”

Section: Microalgae As a Source For Producing Various Forms Of Bioenergymentioning

confidence: 99%

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Microalgal-Based Bioenergy: Strategies, Prospects, and Sustainability

2022

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The fuel crisis with the slumping reserves of fossil fuels and the exponential increase in the demand of energy necessitate a paradigm shift to a more sustainable and eco-friendly energy system. Microalgal biofuel has been recognized as one of the most prominent and versatile alternative renewable energy sources because it can be converted into a wide array of biofuels, such as biodiesel, bioethanol, bioelectricity and biogases such as syngas, methane, hydrogen, and hythane etc., with a lower carbon emission profile. To attain the economic viability of algal fuels, a collective biorefinery approach addressing both the operational and technical limitations is quintessential. The current review critically analyzes and categorizes energy aspects of microalgae through various direct and indirect approaches with the perspective of a circular economy. These approaches include complicated thermochemical and biochemical processes integrating the recovery of a wide range of value-added products apart from biofuels, thus defining a cascading approach for a multiproduct-based biorefinery model. A glimpse of recent technological advancements comprising hybrid cultivation systems, prospects of co-culturing, and the role of automated/modeling approaches in the industrial-scale production of "algal-based bioenergy" is also discussed in detail. Further, the review has also scrutinized and highlighted the developments and bottlenecks in genetic and molecular aspects of strain improvement for bioenergy production. Furthermore, the study also correlated the socioeconomic and environmental impacts of producing this green energy by evaluating the prospects and pitfalls to obtain a holistic picture on this alternative fuel for a bio-based sustainable economy.

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Section: Microalgae As a Source For Producing Various Forms Of Bioenergymentioning

confidence: 99%

Section: Microalgae As a Source For Producing Various Forms Of Bioenergymentioning

confidence: 99%

Microalgal-Based Bioenergy: Strategies, Prospects, and Sustainability

2022

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“…However, the pH values which directly affect the free ammonia concentration were relatively stable, indicating that an alleviation from ammonia toxicity did not occur [34]. The AD of wastewater microalgae as sole substrate was examined in R2.…”

Section: Continuous Reactor Operationmentioning

confidence: 99%

Energy recovery from wastewater microalgae through anaerobic digestion process: Methane potential, continuous reactor operation and modelling aspects

Tsapekos

Kougias

Alvarado-Morales

et al. 2018

Biochemical Engineering Journal

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A mixture of piggery slurry and algal species (mainly composed of Nannochloropsis limnetica), grown in municipal wastewater, were used as substrates for biogas production. Mono-and co-digestion experiments were performed at batch and continuous reactor operation. The mono-digestion of wastewater microalgae led to the highest methane yield (408 ± 34 NmL/gVS). However, for manure-based biogas plants, a 60:40 v/v piggery slurry to wastewater microalgae ratio in terms of organic matter was identified as the most efficient mixture in batch assays (355 ± 27 NmL/gVS). The advantage of co-digestion was also evidenced under continuous reactor operation, which had markedly higher biogas production (23%, p < 0.05) compared to the mono-digestion of livestock manure. Moreover, it was demonstrated that the codigestion process resulted in a more robust process as indicated by lower accumulation of acetate (i.e. presented during mono-digestion of piggery slurry) and propionate (i.e. recorded during mono-digestion of wastewater microalgae). The experimental data were compared with dynamic modelling (BioModel). A new set of biodegradability parameters was estimated and employed to improve the simulations of mono-digestion scenarios. Subsequently, the co-digestion scenario was used for model validation.Results obtained from simulations showed that the co-digestion can lead to relatively high methane productivity and prevent process instabilities.

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“…Algal sludge collected from the algal bloom lakes is an important environmental pollution problem where the treatment and resource recovery of this waste algal sludge has aroused wide concern. − Anaerobic digestion is a promising process in using algae biomass for producing methane biogas; however, the methane production rate is relatively low due to the low biodegradability of algae. , Pretreatment technologies such as mechanical, ultrasound, microwave, thermal, chemical, biological, and combined processes have been investigated in improving the methane production from algae anaerobic digestion. , Bai et al reported that using free nitrous acid (2.31 mg HNO 2 -N·L –1 ) as a pretreatment process has improved the algae methane production yield from 161 to 250 L·CH 4 /kg·VS added . Wang et al found that free ammonia at 60–530 mg NH 3 -N/L has significantly improved the algae solubilization and the methane generation during anaerobic digestion .…”

Section: Introductionmentioning

confidence: 99%

Improved Algal Sludge Methane Production and Dewaterability by Zerovalent Iron-Assisted Fermentation

Geng

Song

et al. 2020

ACS Omega

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This study investigated the methane production improvement of algal sludge by zerovalent iron (ZVI)-assisted anaerobic digestion. The zerovalent iron added were 0.5, 2, 5, 10, and 20 g•ZVI/g•TS (total solid). The results indicated that the addition of ZVI at 2, 5, 10, and 20 g•ZVI/g•TS has improved the methane production 1.07, 1.24, 1.41, and 1.46 times as compared with no ZVI added. The dewaterability of treated algal sludge has improved 1.06, 1.08, 1.08, and 1.11 times as compared with no ZVI addition. The biochemical methane production test results fitted to both one-substrate and two-substrate models. The onesubstrate model indicated that the hydrolysis rate k has increased 8.21, 7.07, 9.39, 3.50, and 5.07 times as compared with R1 where no ZVI was added. The two-substrate model implied that the rapid hydrolysis rate k rapid values were 5. 23, 4.5, 5.98, 2.23, and 3.23 times as compared with R1. The one-substrate model predicted that the value of methane production was in high correlation with the actual value (R 2 > 0.98). The addition of ZVI in algal sludge for methane production without an extra pretreatment process has improved the hydrolysis rate and methane production. This has the potential to be developed as an effective and economic technology in resource recovery from algal sludge.

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Biogas from Algae via Anaerobic Digestion

Cited by 5 publications

References 72 publications

Microalgal-Based Bioenergy: Strategies, Prospects, and Sustainability

Microalgal-Based Bioenergy: Strategies, Prospects, and Sustainability

Energy recovery from wastewater microalgae through anaerobic digestion process: Methane potential, continuous reactor operation and modelling aspects

Improved Algal Sludge Methane Production and Dewaterability by Zerovalent Iron-Assisted Fermentation

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