• Title/Summary/Keyword: Scenedesmus dimorphus

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Effects of light condition in the continuous mass cultivation of microalgae Scenedesmus dimorphus (미세조류 Scenedesmus dimorphus 연속 대량배양 운전에 있어 광 조건이 성장에 미치는 영향)

  • Joo, Sung-jin;Hwang, Hyeon-jeong;Zhang, Shan;Hwang, Sun-Jin
    • Journal of Korean Society of Water and Wastewater
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    • v.29 no.3
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    • pp.319-323
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    • 2015
  • This study investigated the effects of the light conditions on the productivity of scenedesmus dimorphus in the continuous mass cultivation system. To compare the algal productivity according to the light conditions, S. dimorphus was cultivated continuously under the wide range of light intensity(200-600 PPFD) and various light wavelength(white light and red-blue mixed light). After 100 days of cultivation under the different light intensity, the productivity of S. dimorphus increased as light intensity decreased. So, the productivity was maximized as 100 mg/L/d when light intensity was 200 PPFD. In case of light wavelength, the productivity of S. dimorphus was enhanced about 20% with the white light compared to that of the red-blue mixed light. Consequently, the optimal light conditions for the continuous mass cultivation of S. dimorphus were 200 PPFD as light intensity and white light as light wavelength.

Effects of phosphorus concentration and nitrogen sources on photoautotrophic microalgae Scenedesmus dimorphus applied wastewater treatment (인 농도 및 질소원이 광합성 미세조류인 Scenedesmus dimorphus를 이용한 하수고도처리에 미치는 영향)

  • Kim, Tae-Hyeong;Cho, Yong-Beom;Park, Jeong-Eun;Hwang, Sun-Jin
    • Journal of Korean Society of Water and Wastewater
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    • v.27 no.3
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    • pp.325-329
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    • 2013
  • A result of estimating the effects of initial phosphorus concentration and nitrogen sources on removal of nitrogen and phosphorus in wastewater treatment using Scenedesmus dimorphus shows that there was no difference in microalgae growth amount and nitrogen removal amount by phosphorus concentration(5 ~ 60 mg/L). On the other hand, as initial phosphorus concentration increased, phosphorus removal amount was increased by luxury uptake of microalgae. Scenedesmus dimorphus preferred to ammonia when ammonia(40 mg/L) and nitrate(40 mg/L) are simultaneously presented and nitrogen removal rate of ammonia was high at approximately 20 mg/L/day.

Growth and Morphological Changes in Scenedesmus dimorphus Induced by Substances Released from Grazers, Daphnia magna and Moina macrocopa (동물플랑크톤 Daphnia magna와 Moina macrocopa에서 유도된 분비물질에 의한 Scenedesmus dimorphus의 형태변화)

  • Jang, Min-Ho;Joo, Gae-Jae;Takamura, Noriko;Ha, Kyong
    • Korean Journal of Ecology and Environment
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    • v.34 no.4 s.96
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    • pp.285-291
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    • 2001
  • Grazer-induced colony formation was examined using a green alga Scenedesmus dimorphus (T$\ddot{u}$rpin) K$\ddot{u}$tzing. Algae were cultured in a medium with or without filtered water taken from cultures of Daphnia magna Straus (300 ind./L) or Moina macrocopa Straus (500 ind./L). The exposure to zooplankton filtered water (ZFW)promoted colony formation in S. dimorphus, with the magnitude of this response being directly proportional to the relative volume of ZFW that was added to the culture medium. The number of cells/colony and mean particle biovolume of S. dimorphus increased between 24 and 72 hours after exposure to ZFW, most likely due to the influence of chemicals released from D. magna or M. macrocopa, and possily as a defense mechanism against zooplankton grazing.

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Effect of a co-culture of scenedesmus dimorphus and nitrifiers on advanced wastewater treatment capacity (Scenedesmus dimorphus와 질산화 박테리아의 공배양이 하수고도처리능에 미치는 영향)

  • Choi, Kyoung-Jin;Zhang, Shan;Lee, SeokMin;Joo, Sung-Jin;Hwang, Sun-Jin
    • Journal of Korean Society of Water and Wastewater
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    • v.28 no.6
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    • pp.691-698
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    • 2014
  • This study investigated the effect of a co-culture of Scenedesmus dimorphus and nitrifiers using artificial wastewater on the removal of ammonium, nitrate and phosphate in the advanced treatment. To test the synergistic effect of the co-culture, we compared the co-culture treatment with the cultures using S. dimorphus-only and nitrifiers-only treatment as controls. After 6 days of incubation, nitrate was removed only in the co-culture treatment and total amount of N removal was 1.3 times and 1.6 times higher in the co-culture treatment compared to those in the S. dimorphus- and nitrifiers-only treatments, respectively. In case of total amount of P, co-culture treatment removed 1.2 times and 12 times more P than the S. dimorphus -and nitrifiers-only conditions, respectively. This indicates that the co-culture improved removal rates for ammonium, nitrate, and phosphate. This further implies that there was no need for denitrification of nitrate and luxury uptake of P processes because nitrate and phosphate can be removed from the uptake by S. dimorphus. In addition, co-culture condition maintained high DO above 7 mg/L without artificial aeration, which is enough for nitrification, implying that co-culture has a potential to decrease or remove aeration cost in the wastewater treatment plants.

Effects of sodium bicarbonate as an inorganic carbon source on the growth of scenedesmus dimorphus (무기탄소원으로서의 NaHCO3가 미세조류 Scenedesmus dimorphus의 성장에 미치는 영향 평가)

  • Joo, Sung-Jin;Zhang, Shan;Choi, Kyoung Jin;Lee, SeokMin;Hwang, Sun-Jin
    • Journal of Korean Society of Water and Wastewater
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    • v.28 no.5
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    • pp.555-560
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    • 2014
  • This study investigates the effect of sodium bicarbonate ($NaHCO_3$) on growth of S.dimorphus. $NaHCO_3$ concentration was varied from 0 to 2 g-C/L. As a result, the increase in concentration of $NaHCO_3$ up to 1.5 g-C/L increased dry weight of algae. The highest specific growth rate of S. dimorphus was $0.36day^{-1}$ which was obtained at concentration of 0.5 g-C/L $NaHCO_3$. pH showed a large variation range at the concentrations lower than 0.5 g-C/L $NaHCO_3$ whereas inorganic carbon, nitrate and phosphorus removal rates were almost same at the concentrations higher than 0.5 g-C/L $NaHCO_3$ (0.75, 1, 1.25, 1.5, 2 g-C/L $NaHCO_3$). Their average inorganic carbon, nitrate and phosphorus removal rate were 70 mg-C/L/d, 11.3 mg-N/L/d, and 1.6 mg-P/L/d, respectively. Thus, $NaHCO_3$ didn't effect on inorganic carbon, nitrate and phosphorus removal rate of S. dimorphus.

Effects of electric current on electrocoagulation for optimal harvesting of microalgae for advanced wastewater treatment (하수고도처리용 미세조류의 최적회수를 위한 전기응집기술 적용에 있어 전류의 영향)

  • Lee, SeokMin;Joo, Sung Jin;Choi, Kyoung Jin;Zhang, Shan;Hwang, Sun-Jin
    • Journal of Korean Society of Water and Wastewater
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    • v.28 no.4
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    • pp.473-478
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    • 2014
  • Microalgae is known as one alternative energy source of the fossil fuel with the small size of $5{\sim}50{\mu}m$ and negative charge. Currently, the cost of microalgae recovery process take a large part, about 20 - 30% of total operating cost. Thus, the microalgae recovery method with low cost is needed. In this study, the optimum current for Scenedesmus dimorphus recovery process using electrocoagulation techniques was investigated. Under the electrical current, Al metal in anode electrode is oxidized to oxidation state of $Al^{3+}$. In the cathode electrode, the water electrolysis generated $OH^-$ which combine with $Al^{3+}$ to produce $Al(OH)_3$. This hydroxide acts as a coagulant to harvest microalgae. Before applying in 1.5 L capacity electrocoagulation reactor, Scenedesmus dimorphus was cultured in 20 L cylindrical reactor to concentration of 1 OD. The microalgae recovery efficiency of electrocoagulation reactor was evaluated under different current conditions from 0.1 ~ 0.3 A. The results show that, the fastest and highest recovery efficiency were achieved at the current or 0.3 A, which the highest energy efficiency was achieved at 0.15 A.

Feasibility Study on Electro Coagulation Flocculation for Microalgae Harvesting (수처리용 미세조류의 수확을 위한 전기응집기술의 적용)

  • Lee, Seok Min;Cho, Jae Hyung;Noh, Kyung Ho;Zhang, Shan;Hwang, Hyeon-Jeong;Nam, guisook;Hwang, Sun-Jin
    • Journal of Korean Society of Water and Wastewater
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    • v.29 no.6
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    • pp.643-649
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    • 2015
  • Although microalgae are considered as a promising feedstock for biofuels, cost-efficient harvesting of microalgae needs to be significantly improved. In this study, the use of electro coagulation as a more rapid flocculation method for harvesting a freshwater (Scenedesmus dimorphus) microalgae species was evaluated. The results showed that, electro coagulation was shown to be more efficient using an aluminum anode than using an iron anode. And optimum conditions of electro coagulation for harvesting Scenedesmus dimorphus were found. The optimum stirring speed was 100 rpm and optimum pH was 5. Furthermore, the current density which the fastest and highest recovery efficiency is achieved at $30A/m^2$, while the highest energy efficiency was achieved at $10A/m^2$. A the rapid and high recovery efficiency indicate that electro coagulation is a particularly attractive technology for harvesting microalgae.

Seasonal Variation of Phytoplankton Community Structure in NortheasternCoastal Waters off the Korean Peninsula

  • Kang, Yeon-Shik;Choi, Hyu-Chang;Noh, Jae-Hoon;Choi, Joong-Ki;Jeon, In-Seong
    • ALGAE
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    • v.21 no.1
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    • pp.83-90
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    • 2006
  • Phytoplankton community in the coastal waters off the northeastern Korean Peninsula were characterized from May 2002 to August 2003. Taxonomic composition, abundance and biomass were determined at two water depths at 10 sample sites. A total of 153 phytoplankton species including 121 diatoms, 28 dinoflagellates, 7 green algae and 7 other species were identified. The mean abundance of phytoplankton varied from 15 to 430 cells mL–1 in the surface layer and from 11 to 545 cells mL–1 in the bottom layer, respectively. Phytoplankton was more abundant in coastal stations relative to those in more open ocean. The most dominant species were marine diatoms such as Thalassionema nitzschioides, Licmorphora abbreviata, Chaetoceros affinis and Chaetoceros socialis. In addition, a few limnotic diatoms including Fragilaria capucina v. rumpens, the green alga Scenedesmus dimorphus, some marine dinoflagellates and Cryptomonas sp. appeared as dominant species. Mean concentration of total chlorophyll-a varied from 0.22 to 7.87 μg chl-a L–1 and from 0.45 to 6.79 μg chl-a L–1 in the surface and bottom layers, respectively. The contribution of phytoplankton each size-fractionated varied highly with season. The contribution of microphytoplankton to total biomass of phytoplankton in the surface and bottom layer was high in February and August 2003, and that of nano-phytoplankton was high in May 2002 in both surface and bottom layers.