Conversion efficiency and oil quality of low-lipid high-protein and high-lipid low-protein microalgae via hydrothermal liquefaction

Li, Hao; Liu, Zhidan; Zhang, Yuanhui; Li, Baoming; Lu, Haifeng; Duan, Na; Liu, Minsheng; Zhu, Zongmin; Si, Buchun

doi:10.1016/j.biortech.2013.12.074

Cited by 228 publications

(112 citation statements)

References 33 publications

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“…Consequently, higher temperature with a shorter retention time or lower temperature with a longer retention time is recommended in this study. Previous studies (Zhou et al, 2013;Li et al, 2014) showed that the aqueous products from HTL process are mostly used to cultivate microalgae. The pretreatment of heavy dilutions are generally viewed as necessary for algae growth because the aqueous co-product of the HTL process contain high concentration of nutrients such as N and P. Biller et al (2012) applied different dilution multiples of 50, 200, 400 and 600 to the recycled process water from HTL process.…”

Section: Total Nitrogenmentioning

confidence: 99%

“…The result showed similar trends to those obtained in the present study. Literatures (Peterson et al, 2008;Li et al, 2014) indicate that reaction temperature and retention time dramatically affected the distribution of intermediate products in HTL process. Kruse et al (2005), Kruse et al (2007) investigated the influence of proteins on the hydrothermal liquefaction of biomass.…”

Section: Total Nitrogenmentioning

confidence: 99%

“…To date, most studies focusing on HTL processing use lipid-rich microalgae as the feedstock (López Barreiro et al, 2013). Some recent studies have verified that other microalgae with lower lipid content but higher growth rates might constitute a suitable feedstock for this technology (Li et al, 2014;Gai et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

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Characterization of aqueous phase from the hydrothermal liquefaction of Chlorella pyrenoidosa

Gai

Zhang

Chen

et al. 2015

Bioresource Technology

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106

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h i g h l i g h t sHydrothermal liquefaction of low-lipid microalgae C. pyrenoidosa. t r a c tThis study investigated the characteristics of aqueous phase from hydrothermal liquefaction of low-lipid microalgae Chlorella pyrenoidosa. The interactions of operating conditions, including reaction temperature, retention time and total solid ratio were evaluated by response surface methodology. The chemical oxygen demand, total nitrogen and total phosphorus were selected as indicators of the property of AP. Results indicated that total solid ratio was found to be the dominant factor affecting the nutrient recovery efficiencies of AP. Based on energy recovery, GC-MS indicated that the AP at two optimized operating conditions (280°C, 60 min, 35 wt.% and 300°C, 60 min, 25 wt.%) were observed to have a higher concentration of organic acids (10.35% and 8.34%) while the sample (260°C, 30 min, 35 wt.%) was observed to have the highest concentration of N&O-heterocyclic compounds (36.16%).

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Section: Total Nitrogenmentioning

confidence: 99%

Section: Total Nitrogenmentioning

confidence: 99%

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Characterization of aqueous phase from the hydrothermal liquefaction of Chlorella pyrenoidosa

Gai

Zhang

Chen

et al. 2015

Bioresource Technology

Self Cite

106

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“…The chemical structure of lignocellulosic materials can be more easily disrupted under thermochemical treatments such as hydrothermal liquefaction (HTL) 7 . In this case, a combination of high pressure (20 MPa to 30 MPa), high temperature (300 °C to 400 °C) and water catalytic properties leads to fast conversion of biomass into biocrude oil compounds. However, in case of HTL processing another challenge arises from to the low density of lignocellulosic matter that limits the dry matter content of the feedstock and promotes phase separation between the solid biomass and the liquid water during pressurization.…”

Section: Introductionmentioning

confidence: 99%

Application of Algae as Cosubstrate To Enhance the Processability of Willow Wood for Continuous Hydrothermal Liquefaction

Sintamarean

Pedersen

Zhao

et al. 2017

Ind. Eng. Chem. Res.

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This work proposes a novel strategy to improve the continuous processing of wood slurries in hydrothermal liquefaction systems by co-processing with algae. Of all algae tested, brown seaweeds and microalgae perform best in preventing slurries dewatering, the main reason for pumpability issues with wood slurries. Rheological tests (viscosity-shear rate profile) indicate that the addition of these two algae to the wood slurry causes the highest increase in viscosity, which coincides with improved wood slurries stability and pumpability. Hydrothermal liquefaction of wood-algae slurries at 400 °C and 15 minutes in 10 mL tubular batch reactors shows that macroalgae slightly decrease the biocrude yield from 28.5 wt% to 21.6-25.5 wt% while microalgae increase the biocrude yield with more than 40 % relative to pure wood liquefaction. Another benefit of microalgae addition is that the total biomass loading and the organic mass fraction of the slurry can be increased by 100 % and 90 % respectively. Therefore, when co-processed with wood, microalgae can improve the wood feedstock pumpability, biomass loading, organic matter and the biocrude yield.

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“…Samples were placed in the oven's capsules for combustion at 950°C using pure oxygen as the combustion gas and pure helium as the carrier gas. Carbon was determined through infrared absorption, and nitrogen was measured as N 2 using a thermal-conductivity detection system [18].…”

Section: Analysis Methodsmentioning

confidence: 99%

Nitrogen and Biomass Recovery from Low Carbon to Nitrogen Ratio Wastewater by Combing Air Stripping and Microalgae Cultivation

Ma¹,

Lu²,

Zhang³

et al. 2016

JRST

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an air stripping-microalgae cultivation system was proposed to recover nitrogen and produce biomass from biogas fertilizer production wastewater. air stripping was firstly used for reducing the nitrogen to low levels. Then microalgae were used for absorbing the residual nitrogen. Results showed that the nitrogen removal reached 95.0%, with a microalgae productivity and biomass yield of 0.21 (g/L/d) and 4.29 (g-biomass/g-nitrogen), respectively. For the system, 87.7% of the total nitrogen was recycled, from which 83.9% came from air stripping and 3.8% from microalgae absorption. This system enables carbon-emission reduction, wastewater treatment and the promotion of nitrogen recovery.

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Conversion efficiency and oil quality of low-lipid high-protein and high-lipid low-protein microalgae via hydrothermal liquefaction

Cited by 228 publications

References 33 publications

Characterization of aqueous phase from the hydrothermal liquefaction of Chlorella pyrenoidosa

Characterization of aqueous phase from the hydrothermal liquefaction of Chlorella pyrenoidosa

Application of Algae as Cosubstrate To Enhance the Processability of Willow Wood for Continuous Hydrothermal Liquefaction

Nitrogen and Biomass Recovery from Low Carbon to Nitrogen Ratio Wastewater by Combing Air Stripping and Microalgae Cultivation

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