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Engineering the sequestration of car...

Powell, Erin.

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Engineering the sequestration of carbon dioxide using microalgae .

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Engineering the sequestration of carbon dioxide using microalgae ./
作者:	Powell, Erin.
面頁冊數:	242 p.
附註:	Source: Dissertation Abstracts International, Volume: 71-10, Section: B, page: 6289.
Contained By:	Dissertation Abstracts International71-10B.
標題:	Biology, Microbiology. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=NR62703
ISBN:	9780494627037

Engineering the sequestration of carbon dioxide using microalgae .
Powell, Erin.

Engineering the sequestration of carbon dioxide using microalgae . - 242 p.

Source: Dissertation Abstracts International, Volume: 71-10, Section: B, page: 6289.

Thesis (Ph.D.)--The University of Saskatchewan (Canada), 2010.

The primary goal of this project is the engineering of the sequestration of CO2 using the cultivation of the microalgae species Chlorella vulgaris. Secondary goals of the project are the exploration and development of valuable by-products of the cultivation and the determination of whether utilizing microalgae to capture CO2 could be integrated economically into an industrial facility.

ISBN: 9780494627037Subjects--Topical Terms:

1017734
Biology, Microbiology.

Engineering the sequestration of carbon dioxide using microalgae .
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245 1 0 $a Engineering the sequestration of carbon dioxide using microalgae .
300 $a 242 p.
500 $a Source: Dissertation Abstracts International, Volume: 71-10, Section: B, page: 6289.
502 $a Thesis (Ph.D.)--The University of Saskatchewan (Canada), 2010.
520 $a The primary goal of this project is the engineering of the sequestration of CO2 using the cultivation of the microalgae species Chlorella vulgaris. Secondary goals of the project are the exploration and development of valuable by-products of the cultivation and the determination of whether utilizing microalgae to capture CO2 could be integrated economically into an industrial facility.
520 $a The batch growth kinetics of the photosynthetic algal species C. vulgaris were investigated using a well-mixed stirred bioreactor. The growth rate was found to increase as the dissolved CO2 increased to 150 mg/L (10% CO2 by volume in the gas), but fell dramatically at higher concentrations. Increasing the radiant flux also increased growth rate. With a radiant flux of 32.3 mW falling directly on the 500 mL culture media, the growth rate reached up to 3.6 mg of cells/L-h.
520 $a The operation of continuously stirred tank bioreactors (CSTBs) at minimum cost is a major concern for operators. In this work, a CSTB design strategy is presented where impeller stirring speed and aeration rate are optimized to meet the oxygen demand of growing cells, simultaneously minimizing the capital and operating cost. The effect of microbial species, ions in the culture medium, impeller style, as well as changing CSTB size and biomass input density on the optimum operating conditions, is examined. A study of the effects of various parameters on the CSTB design is shown.
520 $a Using the kinetic data collected in the batch growth study, a novel external loop airlift photobioreactor (ELAPB) was designed and tested. A model was developed for C. vulgaris growth in the ELAPB that incorporated growth behaviour, light attenuation, mass transfer, and fluid dynamics. The model predicts biomass accumulation, light penetration, and transient CO 2 concentrations, and compares predictions to experimental data for radiant fluxes of 0.075--1.15 W/m2 and 0--20% CO 2 enrichment of feed air, with a 10% average error. The effect of radiant flux and CO2 concentration is presented with discussion of radial and vertical profiles along the column. For a fed-batch culture at a biomass density of 170 mg/L, the penetration of the radiant flux was found to decrease by 50% within the first 1 cm, and 75% at 2 cm. Theoretical optimum growth conditions are determined to be 0.30 W/m2 and 6% CO2 enrichment of inlet feed air.
520 $a The algal culture was observed to be a workable electron acceptor in a cathodic half cell. A net potential difference of 70 mV was achieved between the growing C. vulgaris culture acting as a cathode and a 0.02 M potassium ferrocyanide anodic half cell. Surge current and power levels of 1.0 mugA/mg of cell dry weight and 2.7 mW/m2 of cathode surface area were measured between these two half cells. The recently developed photosynthetic cathode was also coupled to a fermentative anode to produce a completely microbial fuel cell. Loading effects and the effect of changing culture conditions on fuel cell operation are reported. The maximum power output measured was 0.95 mW/m2 at 90 V and 5000 O. A significant increase in this output is achieved with the addition of supplemental glucose to the anodic half cell and the enrichment of the feed air bubbled into the cathodic half cell with 10% CO2.
520 $a Two economic feasibility studies were performed on the integration of ELAPBs into an industrial facility. Two different design schemes were evaluated, in both cases the maximum profit was achieved with the maximum number of tall columns operated in parallel. The first design evaluated a batch bioethanol facility with off-site oil processing, and the economic feasibility is demonstrated by the positive Net Present Worth achieved over the 20 year life of the plant, at a 10% rate of return on investment. The second design, for a continuous bioethanol operation, processes both oil and algae biomass on-site, but the economics of this second process are only positive (Internal Rate of Return 9.93%) if the government provides financial assistance in the form of generous carbon credits (a speculative $1 00 per tonne of CO2 not yet attained) and a 25% capital equipment grant. (Abstract shortened by UMI.)
590 $a School code: 0780.
650 4 $a Biology, Microbiology. $3 1017734
650 4 $a Engineering, Chemical. $3 1018531
650 4 $a Engineering, Environmental. $3 783782
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710 2 $a The University of Saskatchewan (Canada). $3 1025078
773 0 $t Dissertation Abstracts International $g 71-10B.
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