Carbon Dioxide Utilization for Fast Algae Cultivation
1,2,3Mir Shariful Islam, 1,2Bidyut Baran Saha
1 International Institute for Carbon-Neutral Energy Research (WPI-I2CNER), Kyushu University, Fukuoka, Japan
2 Mechanical Engineering Department, Kyushu University, Fukuoka, Japan
3Department of Oceanography, University of Dhaka,, Dhaka, Bangladesh

Email: saha.baran.bidyut.213@m.kyushu-u.ac.jp

4. Results & future plan

1. Introduction
Algae
are
photosynthetic Tri-dimensional approach (TDA)
organisms commonly used due tothe valuable compounds in their Utilization Negative Mitigationof foodCO2composition and exhale oxygen. It of Greencrisis
can be an alternative resource for technology emission
ensuring
food,fuel,andFast algae production
sustainable human civilization.

Challenges:
 Operating and maintenance cost
 Initial high costs construction
 Large scale fast algae cultivation

Research approach: Using CO2 for fast growth of algae Closed photobioreactor system
cultivation
This research related directly to six and Figure 1 Algae cultivation in TDA
indirectly ten Sustainable development approach and sustainable
goals 2020.
development goals 2020

2. Background Microalgae can be cultivated in both open systems and closed
photobioreactors. It is a significant challenge to design closed
photobioreactors that are economically potential for large scalecultivation. We used carbon di-oxide from the powerplant to reduce
the production cost, contamination chance and increase productivity.
 It ensures highvalue products,
such asnutraceuticals,beta carotene,cosmetics,biofuels, fish
and animal
feed, and manyindustrialapplications.
 It does not
require arable
land and fresh
Figure 2 Algae cultivation in (a) closed system (b)water.
comparison of open and closed photobioreactor system

 In our experiment, thebiomass of Spirulina platensis
increases 1.7 times in 10% CO2
enriched seawater (CSW10)
more than natural seawater(NSW).
 For the first 2 days the growthrate of algae is almost thesame.
 To maximize the effective
parameters for microalgae
cultivation, we simulate thissystem by using numericalFigure 4 Cultivation of Spirulina platensis: 10%
analysis as well as kinetics
carbon dioxide enriched seawater (CSW10) andmodeling (logistics equation)
natural seawater (NSW)and find the predicting values.
Table: Vision of fast microalgae cultivation and negative CO2 emission
Target area
2 years
5 years
10 years
Productivity
Double than present Triple
More than 6yield
foldNegative emission of CO2 1 ton/year
3-fold10-fold
Scalability
300 litres of water The pilot system
Large scale
used for cultivation app. 20-ton water production ofwill be usedseaweedControl room

Solar panel

WindmillPower
gridAlgae
cultivation

Figure 5: Large scale cultivation of microalgae for reducing negative CO2 emission

5. Summary

3. Methodology
 High dissolved gas dissolution (HDGD) technique has been applied to cultivate
Spirulina species for the first time. This new technique is better than any otherconventional gas mixing system.
 It is possible to dissolve gases at normal temperature in contained or seawater.
 To make a prototype for fast algae cultivation with some customization of thecurrent model and choose promising microalgae strain for collect data.
 To test the algae cultivation data and compare it with the prior standard results
for maximizing productivity with minimal cost.
18CO2input

BubbleCO2CO2CO2CO2CO2CO2Pure CO2

CO2CO2CO2CO2CO2CO2CO2CO2CO2CO2CO2CO2CO2CO2CO2CO2CO2CO2CO2CO2CO2CO2CO2CO2CO2CO2CO2CO2CO2CO2CO2CO2CO2Pressure

CO2CO2CO2CO2input

1412108Pump

64

Closed photo bioreactor

2Open system

CO2No CO2 leakage

16Biomass productivity (g m -2 D -1)

CO2leakage

Beginning

0Open
Closedsystem Photo bioreactor

Figure 3: HDGD technique and Biomass productivity in open system and without CO2 leakage in closed photobioreactor

 Microalgae
isthemostalternative promising resourcefor ensuring functional foods(human, animal diets of fishfood), finance, and fuel security.
 A closed photobioreactor system
reduces the leakage of carbon
dioxide and ensures hygienic
issues for algal cultivation.
 High dissolved gas dissolution(HDGD) system is an innovativetechnique for dissolving various
gases on to water whereapproximately 100% dissolution
is possible. Using the HDGD
system, captured CO2 can be
dissolved on to water without
any risk of exposing greenhousegas into the air.
 In a lab-scale experiment, it isobserved that algae absorb
carbon-di-oxide and increase theproduction of biomass.

References[1] Singh J and Dhar DW (2019) Overview of Carbon Capture Technology: Microalgal Biorefinery Concept and State-of-the-art. Frontiers in Marine Science 6:29.
[2] Andrade LM, Andrade CJ, Dias M, et al. (2018) Chlorella and Spirulina Microalgae as Sources of Functional Foods, Nutraceuticals, and Food Supplements; anOverview. MOJ Food Processing and Technology; 6(1): 45-58. DOI: 10.15406/mojfpt.2018.06.00144.
[3] Islam M.S. et al. (2017) A Procedure to Fit an Interpolating Curve to a Set of Logistic data, Dhaka University Journal of Sciences 65(2): 103-105.
[4] Wang J. et al. (2018) Large-scale cultivation of Spirulina in a floating horizontal photobioreactor without aeration or an agitation device, App.Mic.Bio.102: 8979-87.

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