Hydrothermal gasification of Acutodesmus obliquus for renewable energy production and nutrient recycling of microalgal mass cultures

Patzelt, D.; Hindersin, Stefan; Elsayed, Sherif; Boukis, Ν.; Kerner, Martin; Hanelt, Dieter

doi:10.1007/s10811-014-0496-y

Cited by 36 publications

(28 citation statements)

References 46 publications

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“…A sufficient dilution of the toxic compounds was achieved, which did not harm PS II. This was also demonstrated in long-term experiments at a lower dilution of 1:355 over a period of 9 days of cultivation (Patzelt et al 2014). Dilutions of 1:5, 1:10, and 1:50 induced chemical stress with concomitant occurrence of photoinhibition of PS II.…”

Section: Discussionmentioning

confidence: 57%

“…10169, Microalgae and Zygnematophyceae Collection Hamburg) and cultivated at the façade of a residential building (BIQ-Das Algenhaus) in Hamburg-Wilhelmsburg (Germany) in flat panel bioreactors in natural sunlight. For further cultivation details, refer to Patzelt et al (2014). The hydrothermal conversion device is described by Boukis et al (2005).…”

Section: Generation Of Microalgal Biomass and Hydrothermal Gasificationmentioning

confidence: 99%

“…Processing microalgae under hydrothermal conversion conditions causes BMaillard^reactions and results in diverse reaction intermediates which remain in the liquid residue. Patzelt et al (2014) discovered 28 substances, Garcia Alba et al (2013) 15 classes of organic compounds, and Brown et al (2010) nearly 90 different compounds after hydrothermal conversion of microalgal biomass. In our case, herbicides occurred in the liquid residues and affected photosystem II (PS II) and growth of A. obliquus and Chlorella vulgaris measured on a daily basis as demonstrated in a previous study (Patzelt et al 2014).…”

Section: Introductionmentioning

confidence: 99%

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Responses of photosystems I and II of Acutodesmus obliquus to chemical stress caused by the use of recycled nutrients

Patzelt

Hindersin²,

Kerner³

et al. 2015

Appl Microbiol Biotechnol

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Nutrients derived from hydrothermal gasification of Acutodesmus obliquus were tested on its biological compatibility to support growth of the same microalgae. Photosynthetic parameters of photosystems I and II (PS I and PS II) were investigated to study physiological effects on the microalgal cell. The nutrients were collected as liquid residues. Dilutions of 1:500 showed no effect on both photosystems. Lower dilutions affected PS II initially and later also PS I. Cyclic electron flow around PS I compensated for loss of electrons due to partially inhibited PS II. The highest tested concentration of liquid residue erased any photosynthetic activity of PS II after 28 min and onwards. In contrast, PS I remained active. The results suggest that PS I is less susceptible than PS II and that the mixture of chemicals in the liquid residue did not directly affect PS I but PS II. The toxicants in the residues seemed to interfere with linear electron flow of PS II even though light-driven formation of radicals and subsequent damage to one of the photosystems can be excluded as demonstrated in darkness. Lowered photosynthetic activity of PS I during actinic irradiation was caused due to lack of supply of electrons from PS II. The cyclic electron flow might play a key role in delivering the energy needed to restore PS II activity and to biodegrade the toxicants when linear electron flow failed. These negative effects of liquid residue towards microalgal cells require a remediation step for direct application of the liquid residue to substitute commercial fertilizers in microalgal mass cultures.

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Section: Discussionmentioning

confidence: 57%

Section: Generation Of Microalgal Biomass and Hydrothermal Gasificationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Responses of photosystems I and II of Acutodesmus obliquus to chemical stress caused by the use of recycled nutrients

Patzelt

Hindersin²,

Kerner³

et al. 2015

Appl Microbiol Biotechnol

Self Cite

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“…Elliot et al [15] claimed that 50% of the nitrogen demand for cultivation purposes could be recovered by the aqueous recycling. Considering that, along with algae's high CO 2 sequestration rate, developers have recently envisaged holistic closed cycle designs with recycled nutrients and captured CO 2 from industrial systems and power plants [43,47,[51][52][53]. However, one design challenge reported for the recycled nutrients streams is the continued presence of growth inhibitors in the form of phenolic rings, due to intermediate organic re-polymerization as well as amino acid compounds' incomplete conversion.…”

Section: Algal Biomass Case Studymentioning

confidence: 99%

“…However, one design challenge reported for the recycled nutrients streams is the continued presence of growth inhibitors in the form of phenolic rings, due to intermediate organic re-polymerization as well as amino acid compounds' incomplete conversion. Further processing and treatment was recommended before final introduction into the cultivation environment [53].…”

Section: Algal Biomass Case Studymentioning

confidence: 99%

The BioSCWG Project: Understanding the Trade-Offs in the Process and Thermal Design of Hydrogen and Synthetic Natural Gas Production

et al. 2016

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This article presents a summary of the main findings from a collaborative research project between Aalto University in Finland and partner universities. A comparative process synthesis, modelling and thermal assessment was conducted for the production of Bio-synthetic natural gas (SNG) and hydrogen from supercritical water refining of a lipid extracted algae feedstock integrated with onsite heat and power generation. The developed reactor models for product gas composition, yield and thermal demand were validated and showed conformity with reported experimental results, and the balance of plant units were designed based on established technologies or state-of-the-art pilot operations. The poly-generative cases illustrated the thermo-chemical constraints and design trade-offs presented by key process parameters such as plant organic throughput, supercritical water refining temperature, nature of desirable coproducts, downstream indirect production and heat recovery scenarios. The evaluated cases favoring hydrogen production at 5 wt. % solid content and 600 • C conversion temperature allowed higher gross syngas and CHP production. However, mainly due to the higher utility demands the net syngas production remained lower compared to the cases favoring BioSNG production. The latter case, at 450 • C reactor temperature, 18 wt. % solid content and presence of downstream indirect production recorded 66.5%, 66.2% and 57.2% energetic, fuel-equivalent and exergetic efficiencies respectively.

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Various Biomasses from Wastewater and Possibilities of Conversion to Energy Resources

Mayilswamy,

Kandasubramanian

2024

Sewage and Biomass From Wastewater to Energy

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Hydrothermal gasification of Acutodesmus obliquus for renewable energy production and nutrient recycling of microalgal mass cultures

Cited by 36 publications

References 46 publications

Responses of photosystems I and II of Acutodesmus obliquus to chemical stress caused by the use of recycled nutrients

Responses of photosystems I and II of Acutodesmus obliquus to chemical stress caused by the use of recycled nutrients

The BioSCWG Project: Understanding the Trade-Offs in the Process and Thermal Design of Hydrogen and Synthetic Natural Gas Production

Various Biomasses from Wastewater and Possibilities of Conversion to Energy Resources

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