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论文类型：期刊论文

发表时间：2018-04-01

发表刊物：JOURNAL OF APPLIED PHYCOLOGY

收录刊物：SCIE、Scopus

卷号：30

期号：2

页面范围：875-885

ISSN号：0921-8971

关键字：Microalgae; Mixing; Photobioreactor; Wave energy; Bicarbonate

摘要：This study aims to develop a low-cost microalgae culture system which uses a simple closed vessel as photobioreactor to save manufacturing cost, waves for mixing to save energy cost, and high concentration of bicarbonate for carbon supply to avoid the high cost of CO2 -bubbling pipeline construction on the ocean as well as to control pH by buffering the effect of bicarbonate/carbonate. To test this idea, the alkalihalophilic cyanobacterium Euhalothece sp. was cultured with 1.0 M NaHCO3 in small-scale floating photobioreactors (PBRs) on 10-cm-high artificial waves at first. The final biomass concentration was up to 0.91 and 1.47 g L-1 for indoor and outdoor cultures, respectively. However, the recorded dissolved oxygen (DO) was occasionally over-saturated (> 500% of air saturation), indicating mass transfer problem. k(L)a in these PBRs with different culture depth was measured then, and the results showed great variation, from 0.13 to 4.87 h(-1). At the scale of 1.0 m(2). this floating PBR was made with low-cost membrane and inflatable design. It was placed on the ocean surface and mixed with natural waves. Biomass concentration of 1.63 g L-1 and productivity of 8.27 g m(-2) day(-1) were obtained in this culture. With these results, the feasibility of a low-cost microalgae culture system was proven, which could systematically reduce the cost of photobioreactor manufacturing, operating, and maintenance.