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Absorption of CO2byMicroalgaeandItsConversiontoGreenDieselFuel
( Rahmania Admirasari ),( Zeily Nurrachman ),( Agusrifai ),( Sabaruddin W T Jokrokusumo ),( Arif Dwi Santoso ),( Akira Lusia ),( Listyani Purwitasari ),( Diyono ),( Kardono ) 경남대학교 신소재연구소 2012 신소재연구 Vol.24 No.-
Microalgae, microscopic organisms growing on water habitation actually contain chemical structures that can be utilized as a bio-fuel (bio-diesel). These types of plants are considered to be a potential candidate for green and renewable energy resources. Microalgae are also considered having characteristics of carbon neutral due to the high ability to absorb green house gas of carbon dioxide (CO2) during their photosynthesis. Moreover, microalgae cause no land use conflict unlike other bio-fuels based food plants. This paper presents the experimental results of biologically CO2 uptake by cultured microalgae through a pilot scale of an integrated photo-bioreactor (PBR). Besides, micro-algal biomass conversion into biodiesel fuel is also presented in this paper. Micro-algal PBR employed was a Single Tubular Airlift Photo-bioreactor (STAP) type developed by the Environmental Technology Center, Agency for the Assessment and Application of Technology (PTL-BPPT) with a volume of 40 liters. During a 10 day experiment, a 40 L- STAP could absorb 23 grams of CO2per day and produce 147.5 grams of wet basis or 29.5 grams of dry basis of micro-algal biomass. Thus, the CO2 uptake capacity by microalgae in this experiment was about 0.78 grams of CO2 per gram of dry micro-algal biomass. This micro-algal biomass was then converted to biodiesel oil through a process of extraction and trans-esterification which produced about 27 ml of oil. Uptake capacity of CO2by microalgae through STAP and ratio of micro-algal biomass conversion to biodiesel from this experiment were considered to be relatively low however the integrated processes consisting of the CO2 uptake by microalgae, micro-algal biomass harvesting technique and micro-algal biomass conversion to biodiesel have indicated a good system and therefore it is quite promising to be developed to a larger scale.
Hydrochar produced from algal biomass by hydrothermal carbonization
김대기,박기영,오두영 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.0
Biomass is becoming a very important renewable energy source, and was predicted to become high position of the total renewable energy supply. The hydrothermal carbonization is one of attractive thermo-chemical method to upgrade biomass to produce hydrochar with benefit method from the use of no chemical catalytic. Hydrothermal carbonization improved that the upgrading fuel properties and dewatering of algal biomass. These characteristic changes in hydrochar from algal biomass are similar to those of coalification reactions due to dehydration and decarboxylation with increase temperature. The results of this study indicate that hydrothermal carbonization can be used as an effective means to generate highly energy-efficient renewable fuel resources using algal biomass.
( Daegi Kim ),( Daeun Bae ),( Kwanyong Lee ),( Ki Young Park ) 한국폐기물자원순환학회(구 한국폐기물학회) 2015 한국폐기물자원순환학회 춘계학술발표논문집 Vol.2015 No.-
The hydrothermal carbonization is one of attractive thermo-chemical method to upgrade biomass to produce biochar with benefit method from the use of no chemical catalytic. Hydrothermal carbonization improved that the upgrading and dewatering algal biomass, microalga as Chlorella vulgaris, which is conducted at temperatures ranging from 180 to 350℃ with a reaction time of 30 min. These characteristic changes in algal biomass were similar to those of coalification reactions due to dehydration and decarboxylation with increase of hydrothermal reaction temperature. The biochar became a solid fuel substance, the characteristics of which corresponded with fuel between lignite and sub-bituminous coal. The results of this study indicate that hydrothermal treatment can be used as an effective means to generate highly energy-efficient renewable fuel resources using algal biomass.
Green and mild production of 5-aminolevulinic acid from algal biomass
Binglin Chen,Jiachen Li,Yunchao Feng,Kai Le,Yuxia Zai,Xing Tang,Yong Sun,Xianhai Zeng,Lu Lin 한국화학공학회 2021 Korean Journal of Chemical Engineering Vol.38 No.5
Algal biomass was converted into 5-aminolevulinic acid (5-ALA) in five chemical steps: conversion to 5- (chloromethyl)furfural (5-CMF), ammoniation, ring-opening (photo-oxidation), reduction, and hydrolyzation. Among them, we mainly focused on the 5-CMF production and the following ammoniation. To our knowledge, the mixed solvent catalytic system of deep eutectic solvent (DES) and low concentration hydrochloric acid is the first reported for the synthesis of 5-CMF from algal biomass, providing a 24.6% 5-CMF yield at 120 oC for 5 h. Potassium phthalimide (KPI) was employed as an ammoniation reagent with superb selectivity and activity instead of conventional sodium azide (NaN3). Optimizing the experimental design, a 23.7% 5-ALA yield along with high purity (>96%) was achieved from 5-CMF, and the total 5-ALA yield was 5.8% from algal biomass. This work provides a green and mild pathway for 5- ALA production from algal biomass.
Daegi Kim,Daeun Bae,Kwanyong Lee,Ki Young Park 한국폐기물자원순환학회 2015 한국폐기물자원순환학회 학술대회 Vol.2015 No.05
The hydrothermal carbonization is one of attractive thermo-chemical method to upgrade biomass to produce biochar with benefit method from the use of no chemical catalytic. Hydrothermal carbonization improved that the upgrading and dewatering algal biomass, microalga as Chlorella vulgaris, which is conducted at temperatures ranging from 180 to 350℃ with a reaction time of 30 min. These characteristic changes in algal biomass were similar to those of coalification reactions due to dehydration and decarboxylation with increase of hydrothermal reaction temperature. The biochar became a solid fuel substance, the characteristics of which corresponded with fuel between lignite and sub-bituminous coal. The results of this study indicate that hydrothermal treatment can be used as an effective means to generate highly energy-efficient renewable fuel resources using algal biomass.
Optimization of batch dilute-acid hydrolysis for biohydrogen production from red algal biomass
Park, J.H.,Cheon, H.C.,Yoon, J.J.,Park, H.D.,Kim, S.H. Pergamon Press ; Elsevier Science Ltd 2013 INTERNATIONAL JOURNAL OF HYDROGEN ENERGY - Vol.38 No.14
Marine algae are promising alternative sources for bioenergy including hydrogen. Their polymeric structure, however, requires a pretreatment such as dilute-acid hydrolysis prior to fermentation. This study aimed to optimize the control variables of batch dilute-acid hydrolysis for dark hydrogen fermentation of algal biomass. The powder of Gelidium amansii was hydrolyzed at temperatures of 120-180 <SUP>o</SUP>C, solid/liquid (S/L) ratios of 5-15% (w/v), and H<SUB>2</SUB>SO<SUB>4</SUB> concentrations of 0.5-1.5% (w/w), and then fed to batch hydrogen fermentation. Among the three control variables, hydrolysis temperature was the most significant for hydrogen production as well as for hydrolysis efficiency. The maximum hydrogen production performance of 0.51 L H<SUB>2</SUB>/L/hr and 37.0 mL H<SUB>2</SUB>/g dry biomass was found at 161-164 <SUP>o</SUP>C hydrolysis temperature, 12.7-14.1% S/L ratio, and 0.50% H<SUB>2</SUB>SO<SUB>4</SUB>. The optimized dilute-acid hydrolysis would enhance the feasibility of the red algal biomass as a suitable substrate for hydrogen fermentation.
송지나,박향하,허진석,김보연,유현일,최한길 한국수산과학회 2011 한국수산과학회지 Vol.44 No.5
The intertidal benthic macroalgal floras of 19 uninhabited islands were investigated in the Goheung area, South Sea, Korea, in June 2008. Seaweed community structures on the rocky shores of four (Naemaemuldo, Ceoldo,Araedombaeseom, and Jinjioedo) of the 19 islands were also examined. Eighty macroalgal species were identified,including 13 green, 19 brown, and 48 red algae. The maximum number of species was found at Naemaemuldo, with 35 species, and the minimum was at Aredombaeseom, with 21 species. Seaweed biomass ranged from 21.39-76.22 g dry wt/m2, with a maximum at Naemaemuldo, and minimum at Jinjioedo. Sargassum thunbergii was a representative species, distributed widely in the intertidal zone of the four islands. Subdominant seaweeds were Corallina pilulifera and Ulva pertusa at Naemaemuldo and Jinjioedo, respectively. Also, Ishige okamurae was dominant at Ceoldo and Araedombaeseom. Six functional seaweed forms were found at each study site, except for Araedombaeseom, which had four functional groups. On the rocky shores of the four sites, a coarsely-branched form was the most dominant functional group ranging from 44.44-61.90% in species number and 72.42-91. 09% in biomass. In conclusion, among the four study sites, the shore of Naemaemuldo Island had the best ecological status, with the highest number of species, and greatest biomass (mainly brown and red algae) and functional form diversity of seaweeds. Furthermore,on the rocky shore of Naemaemuldo, coarsely branched- and joint calcareous-form seaweeds, which grow in clean and undisturbed environmental conditions, were the representative functional forms.
Jeon, J.m.,Choi, H.W.,Yoo, G.C.,Choi, Y.K.,Choi, K.Y.,Park, H.Y.,Park, S.H.,Kim, Y.G.,Kim, H.J.,Lee, S.H.,Lee, Y.K.,Yang, Y.H. Pergamon ; Elsevier Science Ltd 2013 Biomass & bioenergy Vol.59 No.-
To identify more effective but less toxic compositions of organic solvent mixtures for biodiesel production from Chlorella vulgaris, 15 different organic solvents were examined and compared for their power of lipid extraction from algal biomass. When solvents were individually examined, methanol showed the best efficiency for the extraction of fatty acids, followed by dichloromethane. Although chloroform resulted in yields which were equal to or greater than those of other solvents, it showed a very low fatty acid content and a high level of unknown impurities when analyzed by gas-chromatography (GC). Furthermore, solvent mixtures were applied in order to determine the optimal composition for a high lipid extraction efficiency, using chloroform, methanol and dichloromethane. Through comparison of compositions using the Bligh and Dyers method, the best composition was to be methanol:dichloromethane (1:1). Our findings resulted in a 25% increase of lipid extraction yield, together with C16, C16:2, C18:2 as major components from C. vulgaris.