TY - JOUR
T1 - Effect of Mechanical Pretreatment on Hydrocarbon Extraction from Concentrated Wet Hydrocarbon-Rich Microalga, Botryococcus braunii
AU - Tsutsumi, Shun
AU - Saito, Yasuhiro
AU - Matsushita, Yohsuke
AU - Aoki, Hideyuki
N1 - Funding Information:
*Phone: +81-22-795-7251. E-mail: tsutsumi@dc.tohoku.ac.jp. ORCID Shun Tsutsumi: 0000-0003-3654-6040 Yasuhiro Saito: 0000-0002-9901-4386 Author Contributions The manuscript was written through the contributions of all authors. All authors have approved of the final version of the manuscript. S. Tsutsumi contributed to the conception and design of the present study, analysis and interpretation of the data, drafting of the manuscript, and collection and assembly of data. Y. Saito contributed to the analysis and interpretation of the data, critical revision of the manuscript for important intellectual content, and logistic support for the present study. Y. Matsushita contributed to the analysis and interpretation of the data, critical revision of the article for important intellectual content, and logistic support for the present study. H. Aoki contributed critical revision of the article for important intellectual content, final approval of the manuscript, and obtaining funding and administrative and logistic support for the present study. Funding This work was supported by the Next-generation Energies for Tohoku Recovery (NET) project of the Ministry of Education, Culture, Sports, Science, and Technology (MEXT), Japan. Notes The authors declare no competing financial interest.
Publisher Copyright:
© 2018 American Chemical Society.
PY - 2018/2/15
Y1 - 2018/2/15
N2 - In the present study, we investigated the effects of concentrating a cell suspension of a hydrocarbon-rich microalga, Botryococcus braunii, by membrane filtration on hydrocarbon recovery efficiency. B. braunii suspensions before and after filtration were mechanically pretreated with a high-pressure homogenizer or a JET PASTER high-speed mixer. Concentrating the suspension increased the apparent viscosity of the sample and altered the particle size and shape distributions. The increase of viscosity was derived from the existence probability that was caused by shear forces in the pump that introduced the suspension into the membrane filter and/or between the membrane wall and algae. Homogenizer treatment decreased the sample viscosity from 20 to 5 mPa·s due to the collapse of the bridge between the algae and polysaccharides. The treatment also decreased the hydrocarbon recovery efficiency from 60% to 15% because of the release of intracellular substances that prevented hydrocarbon extraction. In contrast, JET PASTER treatment increased the hydrocarbon recovery efficiency by removing polysaccharides surrounding the colonies and disrupting colonies, without disrupting the cells. Adding oleic acid as a model intracellular substance to the concentrated sample before extraction decreased the amount of extracted hydrocarbon. These results demonstrate that concentrating the sample by filtration combined with JET PASTER treatment can improve the hydrocarbon recovery efficiency of B. braunii. In addition, an energy analysis was performed in the present study. The energy consumption of the JET PASTER treatment combined with filtration was 7.6 times as high as the energy produced.
AB - In the present study, we investigated the effects of concentrating a cell suspension of a hydrocarbon-rich microalga, Botryococcus braunii, by membrane filtration on hydrocarbon recovery efficiency. B. braunii suspensions before and after filtration were mechanically pretreated with a high-pressure homogenizer or a JET PASTER high-speed mixer. Concentrating the suspension increased the apparent viscosity of the sample and altered the particle size and shape distributions. The increase of viscosity was derived from the existence probability that was caused by shear forces in the pump that introduced the suspension into the membrane filter and/or between the membrane wall and algae. Homogenizer treatment decreased the sample viscosity from 20 to 5 mPa·s due to the collapse of the bridge between the algae and polysaccharides. The treatment also decreased the hydrocarbon recovery efficiency from 60% to 15% because of the release of intracellular substances that prevented hydrocarbon extraction. In contrast, JET PASTER treatment increased the hydrocarbon recovery efficiency by removing polysaccharides surrounding the colonies and disrupting colonies, without disrupting the cells. Adding oleic acid as a model intracellular substance to the concentrated sample before extraction decreased the amount of extracted hydrocarbon. These results demonstrate that concentrating the sample by filtration combined with JET PASTER treatment can improve the hydrocarbon recovery efficiency of B. braunii. In addition, an energy analysis was performed in the present study. The energy consumption of the JET PASTER treatment combined with filtration was 7.6 times as high as the energy produced.
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U2 - 10.1021/acs.energyfuels.7b02753
DO - 10.1021/acs.energyfuels.7b02753
M3 - Article
AN - SCOPUS:85042211308
VL - 32
SP - 1761
EP - 1770
JO - Energy & Fuels
JF - Energy & Fuels
SN - 0887-0624
IS - 2
ER -