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Microalgae Cultivation using Offshore Membrane Enclosures for Growing Algae (OMEGA).

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Microalgae Cultivation using Offshore Membrane Enclosures for Growing Algae (OMEGA)./
作者:	Wiley, Patrick Edward.
面頁冊數:	1 online resource (94 pages)
附註:	Source: Dissertations Abstracts International, Volume: 75-06, Section: B.
Contained By:	Dissertations Abstracts International75-06B.
標題:	Microbiology. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3598410click for full text (PQDT)
ISBN:	9781303469886

Microalgae Cultivation using Offshore Membrane Enclosures for Growing Algae (OMEGA).
Wiley, Patrick Edward.

Microalgae Cultivation using Offshore Membrane Enclosures for Growing Algae (OMEGA). - 1 online resource (94 pages)

Source: Dissertations Abstracts International, Volume: 75-06, Section: B.

Thesis (Ph.D.)--University of California, Merced, 2013.

Includes bibliographical references

Offshore Membrane Enclosures for Growing Algae (OMEGA) cultivate microalgae using wastewater contained in floating photobioreactors (PBRs) deployed in marine environments; thereby eliminating competition with agriculture for water, fertilizer, and land. The offshore placement in protected bays near coastal cities co-locates OMEGA with wastewater outfalls and sources of CO 2-rich flue gas on shore, while the seawater supports the PBRs, regulates temperature and can drive forward osmosis to concentrate nutrients and facilitate microalgal dewatering. To evaluate the feasibility of OMEGA, microalgae were grown on secondary-treated wastewater and simulated flue gas (8.5% CO 2 V/V) in a 110-liter prototype system tested in a seawater tank. The flow-through system consisted of tubular PBRs made of transparent linear low-density polyethylene, a gas exchange and harvesting column (GEHC), two pumps, and a custom supervisory control and data acquisition (SCADA) system. The PBRs contained regularly spaced swirl vanes to impart a helical flow and improve mixing of the circulating culture. About 5% of the culture volume was diverted through the GEHC to remove dissolved oxygen (DO), provide supplemental CO 2, and harvest microalgae in a settling chamber. The SCADA system controlled CO2 injection and recorded DO levels, totalized CO2 flow, temperature, circulation rates, photosynthetic active radiation, and photosynthetic efficiency as determined by fast repetition rate fluorometry. In two experimental trials, totaling 23 days in April and May 2012, microalgal productivity averaged 14.1 ± 1.3 g m-2 day-1 (n = 16), supplemental CO2 was converted to biomass with >50% efficiency, and >90% of the ammonia-nitrogen was recovered from secondary effluent. Experimental data collected during prototype evaluation clearly demonstrated that the accumulation of marine biofouling on the PBR tubes strongly suppressed rates of microalgal photosynthesis, as biofouled PBRs consumed less CO 2 than clean PBRs. These results suggest that any OMEGA deployment must have means to remove or prevent biofouling from accumulating on the surface of PBRs. This work also presents preliminary data regarding the use of energy-efficient electrochemical harvesting processes appropriate for the OMEGA configuration presented here. If OMEGA can be optimized for energy efficiency and scaled-up economically, it has the potential to contribute significantly to biofuels production and wastewater treatment.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2023

Mode of access: World Wide Web

ISBN: 9781303469886Subjects--Topical Terms:

536250
Microbiology.
Subjects--Index Terms:

BiofuelsIndex Terms--Genre/Form:

542853
Electronic books.

Microalgae Cultivation using Offshore Membrane Enclosures for Growing Algae (OMEGA).
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502 $a Thesis (Ph.D.)--University of California, Merced, 2013.
504 $a Includes bibliographical references
520 $a Offshore Membrane Enclosures for Growing Algae (OMEGA) cultivate microalgae using wastewater contained in floating photobioreactors (PBRs) deployed in marine environments; thereby eliminating competition with agriculture for water, fertilizer, and land. The offshore placement in protected bays near coastal cities co-locates OMEGA with wastewater outfalls and sources of CO 2-rich flue gas on shore, while the seawater supports the PBRs, regulates temperature and can drive forward osmosis to concentrate nutrients and facilitate microalgal dewatering. To evaluate the feasibility of OMEGA, microalgae were grown on secondary-treated wastewater and simulated flue gas (8.5% CO 2 V/V) in a 110-liter prototype system tested in a seawater tank. The flow-through system consisted of tubular PBRs made of transparent linear low-density polyethylene, a gas exchange and harvesting column (GEHC), two pumps, and a custom supervisory control and data acquisition (SCADA) system. The PBRs contained regularly spaced swirl vanes to impart a helical flow and improve mixing of the circulating culture. About 5% of the culture volume was diverted through the GEHC to remove dissolved oxygen (DO), provide supplemental CO 2, and harvest microalgae in a settling chamber. The SCADA system controlled CO2 injection and recorded DO levels, totalized CO2 flow, temperature, circulation rates, photosynthetic active radiation, and photosynthetic efficiency as determined by fast repetition rate fluorometry. In two experimental trials, totaling 23 days in April and May 2012, microalgal productivity averaged 14.1 ± 1.3 g m-2 day-1 (n = 16), supplemental CO2 was converted to biomass with >50% efficiency, and >90% of the ammonia-nitrogen was recovered from secondary effluent. Experimental data collected during prototype evaluation clearly demonstrated that the accumulation of marine biofouling on the PBR tubes strongly suppressed rates of microalgal photosynthesis, as biofouled PBRs consumed less CO 2 than clean PBRs. These results suggest that any OMEGA deployment must have means to remove or prevent biofouling from accumulating on the surface of PBRs. This work also presents preliminary data regarding the use of energy-efficient electrochemical harvesting processes appropriate for the OMEGA configuration presented here. If OMEGA can be optimized for energy efficiency and scaled-up economically, it has the potential to contribute significantly to biofuels production and wastewater treatment.
533 $a Electronic reproduction. $b Ann Arbor, Mich. : $c ProQuest, $d 2023
538 $a Mode of access: World Wide Web
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650 4 $a Environmental engineering. $3 548583
650 4 $a Alternative energy. $3 3436775
653 $a Biofuels
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653 $a Microalgae
653 $a Photobioreactors
653 $a Wastewater treatment
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773 0 $t Dissertations Abstracts International $g 75-06B.
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3598410 $z click for full text (PQDT)