• Title/Summary/Keyword: $CO_2$ 고정

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Effect of Light on Growth of Chlorella sp. HA-1 in Large-scale Photobioreactors for Biological $CO_2$ Fixation (생물학적 $CO_2$ 고정화를 위한 스케일-업된 광생물반응기에서 Chlorella sp. HA-1의 성장에 미치는 빛의 영향)

  • 이재영;권태순;김호정;양지원
    • KSBB Journal
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    • v.18 no.4
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    • pp.340-345
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    • 2003
  • Feasibility of large-scale photobioreactors for biological CO$_2$ fixation was investigated using Chlorella sp. HA-1. Generally, as the volume of photobioreactor increased, the CO$_2$ fixation rate decreased because of a lower illumination efficiency in large-scale than in small-scale photobioreactors. Though controlling the arrangement and the number of light source, the maximum CO$_2$ fixation rates that could be achieved were 530 and 357 gCO$_2$/㎡day for 40 L and 188 L photobioreactor, respectively, which was higher than the CO$_2$ fixation rate of lab-scale photobioreactor.

CO2 Fixation by Magnesium Hydroxide from Ferro-Nickel Slag (페로니켈 슬래그로 부터 제조된 Mg(OH)2를 이용한 CO2 고정화)

  • Song, Hao-Yang;Seo, Jong-Beom;Kang, Seong-Kuy;Kim, In-Deuk;Choi, Bong-Wook;Oh, Kwang-Joong
    • Clean Technology
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    • v.20 no.1
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    • pp.42-50
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    • 2014
  • In this study, the $Mg(OH)_2$ slurry was made form ferro-nickel slag and then used for $CO_2$ sequestration. The experiments were in the order as leaching step, precipitation, carbonation experiments. According to the leaching results, the optimal leaching conditions were $H_2SO_4$ concentration of 1 M and the temperature of 333 K. In the $Mg(OH)_2$ manufacturing step, NaOH was added to increase the pH upto 8, the first precipitation was confirmed as $Fe_2O_3$. After removal the first precipitation, the pH was upto 11, the $Mg(OH)_2$ was generated by XRD analysis. The $Mg(OH)_2$ slurry was used for $CO_2$ sequestration. The pseudo-second-order carbonation model was used to apply for $CO_2$ sequestration. The $CO_2$ sequestration rate was increased by the $CO_2$ partial pressure and temperature. However, $CO_2$ sequestration rate was decreased when temperature upto 323 K. After $CO_2$ sequestrated by $Mg(OH)_2$, the $CO_2$ can be sequestrated stable as $MgCO_3$. This study also presented optimal sequestration condition was the pH upto 8.38, the maximum $MgCO_3$ can be generated. This study can be used as the basic material for $CO_2$ sequestration by ferro-nickel slag at pilot scale in the future.

EFFECT OF QUINONES ON $NADPH_2$ OXIDATION AND PHOTOSYNTHETIC $CO_2$ ASSIMILATION IN CHLORELLA PYRENOIDOSA (Chlorella Pyrenoidosa에 있어서 $NADPH_2$의 산화(酸化)와 광합성(光合性)에 의(依)한 $CO_2$ 동화작용(同化作用)에 대(對)한 Quinone의 영향(影響))

  • Cho, Duck-Hiyon
    • Applied Biological Chemistry
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    • v.11
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    • pp.29-33
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    • 1969
  • 1. The oxidizability of $NADPH_2$ by quinones in the presence of $NADPH_2$-diaphorase was tested under aerobic conditions. Also the $^{14}CO_2$-fixation rates were compared when Chlorella suspensions were pretreated with $3{\cdot}10^{-5}M$ cocentration of variou quinones for 10 minutes prior and during the $^{14}CO_2$-fixation period. 2. A close correlation seems to exist between the rate of $NADPH_2$ oxidation by quinones and the $^{14}CO_2$-fixation rate. The effect of quinones on $NADPH_2$ oxidation and $^{14}CO_2$-fixation were in the order of Dichlone>06-K>NQ>BQ. 3. It is postulated that the phytotoxicity of quinones on Chlorella is due to the deprival of $NADPH_2$ consequently inhibiting $^{14}CO_2$-fixation, thus causing death of the cells. 4. The effect of quinones on amino acids biosyn-thesis in Chlorella was one of depressed rates, which was especially noted in the case of dichlone. This would be expected from a consideration of $NADPH_2$ deprival and inhibition of $^{14}CO_2$-fixation. Sucrose synthesis was either not affected or rather stimulated, the reasons of which are not clear at the present time.

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The Effect of CO2 Fixation for Microalgae based on CO2 Concentration and Flow Rate (이산화탄소 농도 및 유속에 따른 하천 내 미세조류의 이산화탄소 고정 효과)

  • Park, Hyomin;Lee, Sangdon
    • Journal of Wetlands Research
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    • v.20 no.4
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    • pp.363-369
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    • 2018
  • One of the recent environmental problems is climate change due to the increase of atmospheric $CO_2$, which causes ecological changes and various environmental problems. Therefore, various studies are being carried out to reduce $CO_2$ in the world in order to solve various environmental problems caused by increase of $CO_2$. The $CO_2$ reduction using microalgae is an environmentally friendly method by using photosynthesis reaction of microalgae. However, most studies using single species. There is no study on the $CO_2$ fixing efficiency of microalgae in natural rivers. Therefore, this study was to identify the microalgae in the Sum river and to analyze the growth characteristics of microalgae in the river to obtain optimal culture conditions. And the changes of biomass and chlorophyll-a of microalgae were analyzed according to $CO_2$ concentration and injection rate. The purpose of this study was to investigate the fixing efficiency of carbon dioxide in microalgae in natural rivers. Six kinds of dominant species were observed as a result of the identification of microalgae in Sum river(Ankistrodesmus falcatus, Scenedesmus intermedius, Selenodictyum sp., Xanthidium apiculatum var. laeve, Cosmarium pseudoquinarium, Dictyosphaerium pulchellum). All of these species were green algae. Biomass and chlorophyll-a increased with the increase of $CO_2$ concentration and biomass and chlorophyll-a increased faster flow rate at the same $CO_2$ concentration. Also, the quantity of $CO_2$ fixation on the microalgae tended to be higher when the flow rate of injected gas was faster. This study can be referred as being significant in the micro-algae in river. In addition, the optimal conditions for $CO_2$ fixation of microalgae in rivers and the quantification of the quantity of $CO_2$ fixation from microalgae in rivers can be used as basic data for future policy of $CO_2$ reduction.

$CO_2$ Fixation by Chlorella HA-1 Cultured in Bubble Columns. (기포탑 반응기에서 Chlorella HA-1의 $CO_2$ 고정화 특성)

  • 성기돈;이진석;신철승;김미선;박순철;김승욱
    • Microbiology and Biotechnology Letters
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    • v.26 no.1
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    • pp.1-6
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    • 1998
  • The characteristics of $CO_2$ fixation by Chlorella HA-1 cultured in bubble columns were studied to achieve high photosynthetic rates per basal area. The influence of experimental conditions such as the diameter of a bubble column and gas flow rate, on photosynthesis of Chlorella HA-1 was investigated. The maximum productivity and the overall $CO_2$ fixation rate obtained in a 0.15 L bubble column was 1.09 g dry biomassa-day and 1048 g CO$_2/\m^2$-day, respectively. Light limitation has been observed in the bubble columns having a diameter larger than 3.5 cm.. As the reactor volume increased, the decrease of the $CO_2$ fixation rate was remarkable. High gas flow rate was helpful to mitigate the light limitation problem.

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Carbon Dioxide Fixation using Spirulina Platensis NIES 39 in Polyethylene Bag (Spirulina Platensis NIES 39를 이용한 Polyethylene Bag 반응기에서의 이산화탄소 고정화)

  • Kim, Young-Min;Kim, Ji-Youn;Lee, Sung-Mok;Ha, Jong-Myung;Kwon, Tae-Ho;Lee, Jae-Hwa
    • Applied Chemistry for Engineering
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    • v.21 no.3
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    • pp.272-277
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    • 2010
  • To replace current expensive photobioreactor, this study was conducted to develop low-cost photobioreactor made of polyethylene bag. In previous study, optimal culture conditions of Spirulina platensis NIES 39 have been established, and based on these, the study of biological carbon dioxide fixation has been conducted. The maximum growth was the biomass 2.677 g/L at conditions of 10% $CO_2$, 0.1 vvm. It was shown that $F_{CO_2}$ was 4.056 g $CO_2$/L and $R_{CO_2}$ was 0.312 g $CO_2$/L/day. But, compared with the data at conditions of 5% $CO_2$, 0.1 vvm, $FE_{CO_2}$ was shown 52.372% which is half of it. Regarding the effect of $CO_2$ following illumination, the growth revealed that the input conditions, for 10 min per 3 h, were excellent in the light. $CO_2$ in absent light. $CO_2$ concentration and flow rate were 5% $CO_2$, 0.1 vvm, respectively. Finally, the addition of $CO_2$ was ineffective in the absence of light.

Characterization of Controlled Low Strength Materials Utilizing CO2-fixation Steel Slag and Power Plant Bottom Ash (CO2고정화한 제강슬래그와 발전소 바닥재를 활용한 저강도 고유동 채움재의 특성)

  • Cho, Yong-Kwang;Kim, Chun-Sik;Nam, Seong-Young;Cho, Sung-Hyun;Lee, Hyoung-Woo;Ahn, Ji-Whan
    • Journal of Energy Engineering
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    • v.27 no.2
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    • pp.55-60
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    • 2018
  • In this study investigated the Controlled Low Strength Materials using coal ash and steel slag(KR slag) as the main material in the thermal power plant classified as waste resource. Bottom ash and KR slag are mixed at a ratio of 7: 3 to expand the use of industrial by-products through carbonate($CO_2$-fixation) reactions and inhibit the exudation of heavy metals. The results showed that the water content increased as the content of bottom ash increased. It was confirmed that as the powder content increased, the bleeding ratio decreased. Also, as the content of one kind of ordinary portland cement (OPC) decreased, activation of hydration reaction decreased and compressive strength decreased. However, when the mixed composition is appropriately adjusted, the compressive strength of 2.0 MPa required for the controlled low-strength material can be satisfied.

Photosynthetic Responses of Populus alba×glandulosa to Elevated CO2 Concentration and Air Temperature (CO2 농도 및 기온 상승에 대한 현사시나무의 광합성 반응)

  • Lee, Solji;Oh, Chang-Young;Han, Sim-Hee;Kim, Ki Woo;Kim, Pan-Gi
    • Korean Journal of Agricultural and Forest Meteorology
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    • v.16 no.1
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    • pp.22-28
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    • 2014
  • This study was conducted to investigate the photosynthetic characters of Populus alba${\times}$glandulosa cuttings in response to elevated $CO_2$ concentration and air temperature for selecting tree species adaptive to climate change. The cuttings were grown in environment controlled growth chambers with two combinations of $CO_2$ concentration and air temperature conditions: (i) $22^{\circ}C$ + $CO_2$ 380 ${\mu}mol$ $mol^{-1}$ (control) and (ii) $27^{\circ}C$ + $CO_2$ 770 ${\mu}mol$ $mol^{-1}$ (elevated) for almost three months. The cuttings under the elevated treatment showed reduced tree height and photosynthetic pigment contents such as chlorophyll and carotenoid. In particular, the elevated treatment resulted in a marked reduction in the chlorophyll a closely associated with $CO_2$ fixative reaction system. Different levels of reduction in photosynthetic characters were found under the elevated treatment. A decrease was noted in photochemical reaction system parameters: net apparent quantum yield (7%) and photosynthetic electron transport rate (14%). Moreover, a significant reduction was obvious in $CO_2$ fixative reaction system parameters: carboxylation efficiency (52%) and ribulose-1,5-bisphosphate(RuBP) regeneration rate (24%). These results suggest that the low level of photosynthetic capacity may be attributed to the decreased $CO_2$ fixative reaction system rather than photochemical reaction system.

Biological Co2 Fixation to Antioxidant Carotenoids by Photosynthesis Using the Green Microalga Haematococcus pluvialis (광합성 녹색 미세조류 Haematococcus pluvialis를 이용한 이산화탄소 고정화 및 항산화성 카로티노이드 생산)

  • Kang, Chang Duk;Park, Tai Hyun;Sim, Sang Jun
    • Korean Chemical Engineering Research
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    • v.44 no.1
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    • pp.46-51
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    • 2006
  • As one of the $CO_2$ reduction strategies, a biological method was proposed to convert $CO_2$ to useful biomass with antioxidant carotenoids by photosynthetic microorganisms. One of the photoautotrophs, Haematococcus pluvialis is a freshwater green microalga and accumulates the secondary carotenoid astaxanthin during induction of green vegetative cells to red cyst cells. In this study, $CO_2$ fixation and astaxanthin production using H. pluvialis was conducted by photoautotrophic culture in the $CO_2$ supplemented photo-incubator. Maximum growth rate of H. pluvialis was obtained at a 5% $CO_2$ environment on basic N and P conditions of NIES-C medium. The photoautotrophic induction consisted of 5% $CO_2$ supply and high light illumination promoted astaxanthin synthesis in H. pluvialis, yielding an astaxanthin productivity of $9.6mg/L{\cdot}day$ and a $CO_2$ conversion rate of $27.8mg/L{\cdot}day$ to astaxanthin. From the results the sequential photoautotrophic culture and induction process using H. pluvialis is expecting an alternative $CO_2$ reduction technology with a function of valuable biosubstance production.

Feasibility study of LFG-MGT power generation system with $CO_2$ fixation development (농작물의 $CO_2$ 고정화 연계 LFG-MGT 시스템의 타당성 연구)

  • Park, Jung-Keuk;Hur, Kwang-Beom;Rhim, Sang-Gyu
    • 한국신재생에너지학회:학술대회논문집
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    • 2009.06a
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    • pp.821-824
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    • 2009
  • LFG-MGT CHP system development project with $CO_2$ enrichment in greenhouses was introduced. LFG is produced from the anaerobic digestion of landfilled waste and it has been utilized for power/heat generation since it contains around 50% of $CH_4$. Utilization of LFG from small scale landfill is also needed as well as large scale landfill. However, due to economy of scale, it is very difficult to develop business model. In this context, combining CHP system with greenhouses is considered as feasible option for LFG utilization. LFG-MGT CHP system with $CO_2$ fixation in greenhouses has been derived as an active greenhouse gas reduction strategy, The focus of the system is beyond carbon neutral LFG utilization to neutral carbon absorption. The system is feasible in terms of direct and indirect $CO_2$ emission reduction with more economical way.

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