Microalgal growth and fatty acid productivity on recovered nutrients from hydrothermal gasification of Acutodesmus obliquus

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

doi:10.1016/j.algal.2015.05.002

Cited by 12 publications

(5 citation statements)

References 34 publications

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“…Unlike anaerobic digestion, SCWG is not currently commercially available and some technological challenges have to be overcome. The conditions of supercritical water (SCW; T > 374 °C, p > 22.1 MPa) offer several advantages: (i) a low salt solubility allowing the separation of the minerals prior to gasification; , (ii) tar and coke formation is reduced because of the high solubility of organic substances in SCW. , Many research papers have reported continuous SCWG of several microalgae species at high temperatures (600–700 °C). − Elsayed et al performed SCWG (600–650 °C, 28 MPa) of Scenedesmus obliquus (2.5–5% dry matter, DM) over a continuous period up to 50 h. The carbon gasification efficiency was above 90% and the gas consisted of H 2 (46 vol %), CH 4 (19 vol %), CO 2 (29 vol %), and C 2 H 6 (4.5 vol %). Patzelt et al have gasified (650 °C, 28 MPa) Acutodesmus obliquus (2.5–5% DM) over a period of 50 h with a flow rate of 4.8 g min –1 and observed a gasification efficiency up to 98%.…”

Section: Introductionmentioning

confidence: 99%

Catalytic Supercritical Water Gasification: Continuous Methanization of Chlorella vulgaris

Peng

Vogel

Refardt

et al. 2017

Ind. Eng. Chem. Res.

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Continuous catalytic supercritical water gasification (CSCWG; 400 °C, 28 MPa) of microalgal biomass (Chlorella vulgaris) was carried out at the microalgae production site of ZHAW in Wädenswil (Switzerland) nonstop over a period of 100 h. Microalgae slurries (3–15 wt %) were successfully gasified to a methane-rich gas for 55 h. The low total organic carbon of the reactor effluent (<400 mg L–1) recorded during that period demonstrated the high catalytic activity of the Ru/C catalyst for converting microalgae to the gaseous products. The addition of a sulfur removal step with a commercial zinc oxide adsorbent was essential for protecting the catalyst against sulfur poisoning. A brine effluent rich in nutrients (N, K, S, P, Na) was withdrawn continuously from a salt separator. In summary, the use of a zinc oxide adsorbent upstream of the catalyst bed, together with a higher ruthenium loading of the catalyst, improved the long-term performance of the CSCWG process significantly.

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Section: Introductionmentioning

confidence: 99%

Catalytic Supercritical Water Gasification: Continuous Methanization of Chlorella vulgaris

Peng

Vogel

Refardt

et al. 2017

Ind. Eng. Chem. Res.

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“…Pretreatment of AP from hydrothermal liquefaction and gasification improved the growth in recycled medium (Patzelt et al, 2014). However, loss of nutrients due to pretreatment of AP with AC has been observed (Patzelt et al, 2015). Cultivation of more than one strain showed better resistance to toxic compounds in AP compared to single‐strain cultivation (Godwin et al, 2017).…”

Section: Nutrient Recovery From Thermal Treatment Of Microalgae Biomassmentioning

confidence: 99%

“…Recently, it was reported that the solid fraction from the HTL process contains a considerable amount of inorganic nutrients, such as P, K, Ca, Mg, S, Ni, Na, and Mn etc. (Gai et al, 2015;Patzelt et al, 2015). Presence and distribution of organic and inorganic molecules in AP from HTL of microalgal biomass depends on various reactions taking place at different temperatures due to decomposition of lipids, proteins, and carbohydrate fractions of biomass as given in Figure 3 (Chen et al, 2014).…”

Section: Characterization Of Ap From Htl Of Microalgae Biomassmentioning

confidence: 99%

“…Therefore, AP from HTL must be further treated to remove these organic molecules before safe disposal of water as it cannot be reused for many cycles due to buildup of these elements. Treatment of AP with AC was proven effective in eliminating the toxic aromatics (Patzelt et al, 2014(Patzelt et al, , 2015Pham et al, 2013;Shanmugam et al, 2017).…”

Section: Factors Affecting the Growth Of Microalgae In Ap From Htlmentioning

confidence: 99%

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Sustainable production of microalgae biomass for biofuel and chemicals through recycling of water and nutrient within the biorefinery context: A review

Farooq

2021

GCB Bioenergy

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Commercial‐scale production of microalgae biomass for biofuel and biochemicals requires a substantial amount of water and nutrients. Many studies are conducted to explore the potential of various aqueous streams originating from harvesting stage and different energy recovery steps as an alternative for water and nutrient supply. Presence of toxic organic compounds, unassimilated ions, particulate matter, and high alkalinity in post‐harvest water limit its recyclability. Nutrient recovery from biomass via anaerobic digestion (AD) and various hydrothermal processes is being explored. So, there is a need to understand the impact of harvesting methods, nature and impact of organic compounds, buildup of algogenic organic matter (OM), amount of unused nutrients, and salinity on water recycling. Optimum conditions for maximum nutrient recovery from AD and hydrothermal processes are discussed for effective nutrient recycling. This review is an attempt to understand the challenges associated with the recycling of aqueous streams for water and nutrient requirement for sustainable microalgae cultivation. The effectiveness of a recycling stream is defined here as “biomass ratio.” Possible growth inhibiting factors are identified, and their solutions are suggested along with potential directions for future research. Large‐scale sustainable cultivation of microalgae through recycling of different streams depends on better understanding of biological activity of algal OM through detailed characterization and in‐depth understanding of physiochemical properties.

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“…methanogens), from the viewpoint of chemical engineers, algae are less well-known organisms and only conditions related to their industrial production have been widely studied in the search of an efficient process to fix inorganic carbon (Sostaric et al, 2009). Microalgae are known to exhibit high growth rates, high lipid production capacity, high CO2 fixation rates, and low land use, as compared to other energy crops (Amin, 2009;Zeng et al, 2011;Patzelt et al, 2015). An additional advantage is that they can succeed under conditions with high level of CO2.…”

Section: Introductionmentioning

confidence: 99%

Influence of hydraulic retention time and carbon loading rate on the production of algae

Fernández-Marchante

Asensio

Lobato

et al. 2018

Journal of Biotechnology

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This paper is focused on the assessment of the production of algae in batch bioreactors. Hydraulic retention time, carbon loading rate and light color were the inputs of the study and algae production the main output. Bioreactors were operated in semi-continuous mode and tests lasted two months, more than two times the period required to meet a steady-state response. This steady-state was verified with plateau responses in both, soluble parameters and suspended solids. Results points out the great relevance of temperature. Likewise, they show that green light improves the production of algae, as well as long HRT and high CLR. Maximum production rates attained were in the range 4-14 mg d L. The ratio COD /TSS for this biofuel was almost constant (3.13 mg COD mg TSS) but the quality of the product obtained in terms of the Mean Oxidation State of Carbon is completely different. Longer HRT leads to lower MOSC and hence to potentially more valuable fuels.

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Microalgal growth and fatty acid productivity on recovered nutrients from hydrothermal gasification of Acutodesmus obliquus

Cited by 12 publications

References 34 publications

Catalytic Supercritical Water Gasification: Continuous Methanization of Chlorella vulgaris

Catalytic Supercritical Water Gasification: Continuous Methanization of Chlorella vulgaris

Sustainable production of microalgae biomass for biofuel and chemicals through recycling of water and nutrient within the biorefinery context: A review

Influence of hydraulic retention time and carbon loading rate on the production of algae

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