Adsorptive bubble separation methods and systems for dewatering

Details Adsorptive bubble separation methods and systems for dewatering Adsorptive bubble separation methods and systems for dewatering

1996-12-20

1999-09-14

Lithgow, Thomas M.

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

210806, 210768, 210770, 47 14, 241 1, 241 2, 241301, 241 2411, 4352571, 435259, 4353061, A01G 700, B01D 102

Patent

active

059518758

ABSTRACT:
A process and system are disclosed for recovering mixed carotenoids from the alga Dunaliella salina. The harvested cells are ruptured, typically by circulating the algal suspension at high pressure through a pump loop. The cells can then be dewatered by absorptive bubble separation techniques, including a froth floatation circuit that has a roughing zone and a concentrating zone. If further concentration is desired, the algal concentrate can be mechanically filtered in a cross flow microfiltration unit in the absence of flocculating agents with substantially no loss of carotenoids in the permeate. Various methods for extracting mixed carotenoids and other components from the algae are disclosed, including dense gas extraction, and extractions with natural and synthetic flavorants, and edible oils.

REFERENCES:
patent: 3268606 (1966-08-01), Jaeger
patent: 3309032 (1967-03-01), Filz
patent: 3479281 (1969-11-01), Kikindai
patent: 3780471 (1973-12-01), Ort
patent: 4115949 (1978-09-01), Avron et al.
patent: 4199895 (1980-04-01), Avron et al.
patent: 4253271 (1981-03-01), Raymond
patent: 4341038 (1982-07-01), Bloch et al.
patent: 4439629 (1984-03-01), Ruegg
patent: 4554390 (1985-11-01), Curtain et al.
patent: 4680314 (1987-07-01), Nonomura
patent: 4851339 (1989-07-01), Hills
patent: 4938865 (1990-07-01), Jameson
patent: 4958460 (1990-09-01), Nielson et al.
patent: 4981582 (1991-01-01), Yoon et al.
patent: 5167798 (1992-12-01), Yoon et al.
patent: 5188726 (1993-02-01), Jameson
patent: 5310554 (1994-05-01), Haigh
patent: 5332100 (1994-07-01), Jameson
patent: 5378369 (1995-01-01), Rose et al.
Rose, P.D. et al.; "Cross-flow Ultrafiltration Used in Algal High Rate Oxidation Pond Treatment of Saline Organic Effluents with the Recovery of Products of Value"; Water Science and Technology; 1992; vol. 25, No. 10; pp. 319-327.
Smith, P.H. et al.; "Froth Flotation for Harvesting Chlorella Algae"; Northwest Science, vol. 42, No. 4, 1968; pp. 165-171.
Chemical Abstracts 85400C; Vendt, V.P.; "Experimental-industrial Preparation of Carotene from Natural Brine Containing the Algae Dunaliella Salina"; Nov. 18, 1968; vol. 69, No. 21, p. 7972.
D.X. He., et al., "A Multiple-Loop Flotation Column For Wastewater Treatment", Separations Technology 5 (1995), pp. 133-138.
N. Sammy, "Pilot .beta.-Carotene Production: The Northern Territory Experience", Seventh Symposium on Salt vol. 1, pp. 679-684 (1993).
T.P. Moulton et al., "The Mass Culture of Dunaliella vividis (Volvocales, Chlorophyta) for Oxygenated Carotenoids: Laboroatory and Pilot Plant Studies", Hydrobiologia 204/205, pp. 401-408 (1990).
C.C. Curtain et al., "Manufacture of .beta.-Carotene from the Salt Lake Alga Dunaliella salina; the Scientific and Technical Background", Australian Journal of Biotechnology, vol. 1, No. 3, pp. 51-57 (1987).
L. J. Borowitzka et al., "Commercial Production of .beta.-Carotene by Dunaliella salina in Open Ponds", Bulletin of Marine Science, 47(1), pp. 244-252 (1990).
I. Enes et al., "Optimization of Operating Strategies in .beta.-Carotene Microalgae Bioreactors", Computers Chem. Engng., vol. 20 Suppl., p. S509 (1996).
T.P. Moulton et al., "The Mass Culture of Dunaliella salina for .beta.-Carotene: From Pilot Plant to Production Plant", Hydrobiologia 151/152, pp. 99-105 (1987).
G. Shelef, "High-Rate Algae Ponds For Wastewater Treatment and Protein Production", Wat. Soi. Tech. vol. 14, pp. 439-452 (1982).
L. Schilpalius, "The Extensive Commercial Cultivation of Dunaliella Salina", Bioresource Technology 38 pp. 241-243 (1991).
S.S. Honeycutt, "A Technique for Harvesting Univellular Algae Using Colloidal Gas Aphrons", Biotechnology and Bioengineering Symp. No. 13, pp. 567-575 (1983).

Affiliated with

Also associated with

Rating

Adsorptive bubble separation methods and systems for dewatering does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Adsorptive bubble separation methods and systems for dewatering , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Adsorptive bubble separation methods and systems for dewatering will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1507375