Enhancing Photon Utilization Efficiency for Astaxanthin Production from Haematococcus lacustris Using a Split-Column Photobioreactor

2016 ◽  
Vol 26 (7) ◽  
pp. 1285-1289 ◽  
Author(s):  
Z-Hun Kim ◽  
Hanwool Park ◽  
Ho-Sang Lee ◽  
Choul-Gyun Lee
Keyword(s):  
Utilization Efficiency ◽  
Haematococcus Lacustris ◽  
Astaxanthin Production

scholarly journals Sequential Continuous Mixotrophic and Phototrophic Cultivation Might Be a Cost-Effective Strategy for Astaxanthin Production From the Microalga Haematococcus lacustris

2021 ◽  
Vol 9 ◽  
Author(s):  
Mahammed Ilyas Khazi ◽  
Liangtao Shi ◽  
Fakhra Liaqat ◽  
Yuxin Yang ◽  
Xin Li ◽  
...  
Keyword(s):  
Biomass Concentration ◽  
Cost Effective ◽  
Mixotrophic Cultivation ◽  
Promising Alternative ◽  
Seed Culture ◽  
Haematococcus Lacustris ◽  
Astaxanthin Production ◽  
Astaxanthin Content ◽  
Novel Strategy ◽  
Raceway Ponds

Although Haematococcus lacustris has been developed for astaxanthin production for decades, the production cost is still high. In order to modify the production processes, we proposed a novel strategy of cultivation, featured by sequential indoor continuous mixotrophic cultivation for the production of green cells followed by outdoor phototrophic induction for astaxanthin accumulation. The continuous mixotrophic cultivation was first optimized indoor, and then the seed culture of mixotrophic cultivation was inoculated into outdoor open raceway ponds for photoinduction. The results showed that mixotrophically grown cultures could efficiently grow without losing their photosynthetic efficiency and yielded higher biomass concentration (0.655 g L−1) and astaxanthin content (2.2% DW), compared to phototrophically grown seed culture controls. This novel strategy might be a promising alternative to the current approaches to advance the production technology of astaxanthin from microalgae.

A novel approach to enhance astaxanthin production in Haematococcus lacustris using a microstructure-based culture platform

2019 ◽  
Vol 39 ◽  
pp. 101464 ◽  
Author(s):  
Sang-Il Han ◽  
Junyi Yao ◽  
Changsu Lee ◽  
Jaewon Park ◽  
Yoon-E Choi
Keyword(s):  
Novel Approach ◽  
Haematococcus Lacustris ◽  
Astaxanthin Production

Improvement of Data Utilization Efficiency for Cache Memory by Compressing Frequent Bit Sequences

2016 ◽  
Vol E99.C (8) ◽  
pp. 936-946
Author(s):  
Ryotaro KOBAYASHI ◽  
Ikumi KANEKO ◽  
Hajime SHIMADA
Keyword(s):  
Utilization Efficiency ◽  
Cache Memory ◽  
Data Utilization

Improved Oxygen Dissolution Control for Oxygen Activated Sludge

1988 ◽  
Vol 20 (4-5) ◽  
pp. 101-108 ◽  
Author(s):  
R. C. Clifft ◽  
M. T. Garrett
Keyword(s):  
Activated Sludge ◽  
Control Method ◽  
Control Strategies ◽  
Cost Savings ◽  
Utilization Efficiency ◽  
Oxygen Production ◽  
Oxygen Utilization ◽  
Potential Cost ◽  
Oxygen Dissolution ◽  
The City

Now that oxygen production facilities can be controlled to match the requirements of the dissolution system, improved oxygen dissolution control can result in significant cost savings for oxygen activated sludge plants. This paper examines the potential cost savings of the vacuum exhaust control (VEC) strategy for the City of Houston, Texas 69th Street Treatment Complex. The VEC strategy involves operating a closed-tank reactor slightly below atmospheric pressure and using an exhaust apparatus to remove gas from the last stage of the reactor. Computer simulations for one carbonaceous reactor at the 69th Street Complex are presented for the VEC and conventional control strategies. At 80% of design loading the VEC strategy was found to provide an oxygen utilization efficiency of 94.9% as compared to 77.0% for the conventional control method. At design capacity the oxygen utilization efficiency for VEC and conventional control was found to be 92.3% and 79.5%, respectively. Based on the expected turn-down capability of Houston's oxygen production faciilities, the simulations indicate that the VEC strategy will more than double the possible cost savings of the conventional control method.

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