Monthly average data of water temperature (WT), room temperature (RT), solar radiation (SR), salinity, pH, and total energy consumption in the microalgae pilot plant.
Abstract
This chapter reports an annual production of Spirulina (Arthrospira) maxima in Ansan, South Korea (37.287°N, 126.833°E) with temperate four seasons climate for testing industrial application. Construction on pilot plant of semi-open raceway system (ORS) with each 20 ton culture volume has been established in early 2011 based on building information modeling (BIM). An optimized design of pilot culture system for microalgae scale-up culture in temperate area and details of culture was presented. In scale-up trials using two ORSs, the strain displayed satisfactory annual growth under batch condition. In an annual trial, average biomass concentration was recorded at 0.99 ± 0.16 g/L, which showed stable productivity in a year. Maximum concentration was estimated at 1.418 ± 0.09 g/L in August, while minimum production was estimated at 0.597 ± 0.05 g/L in October. Despite insufficient solar radiation and nutrients, ORS was favorable for S. maxima production. The technical strategies contribute to the annual production of S. maxima in this region: controlling the culture temperature, reducing production cost, and retrospective climatic data-based BIM construction of the greenhouse. Consequently, pilot production of S. maxima was feasible in Korean climates, a region previously thought to be outside its geographic limits.
Keywords
- Spirulina production
- temperate climate
- BIM-based pilot plant construction
- Korea
1. Introduction
Nowadays, microalgae are mostly cultured in photobioreactors (PBRs) and open raceway systems (ORSs) for industrial production [2, 19, 20]. Advantages of PBR include applicability of various designs in production, easy control of growth condition, prevention of biological contamination, and high productivity. On the contrary, it requires high expenses in initial investments, device maintenance, and expansion of mass production facility [20, 21, 22]. In contrast, ORS can directly use solar energy and CO2 in the air though it has a low aerial productivity than PBR, and it is also advantageous due to inexpensive materials for facility (PVC, FRP, concrete, plastic, and soil) and easy to scale up structure. In respect of commercialization, ORS needs a low initial investment cost, while it has a highly efficient productivity, so that ORS has been attracting more interest [15, 20, 23, 24, 25, 26, 27, 28, 29, 30]. However, there are still steps that need to be taken for the commercialization of ORS, which includes a control of water temperature and light intensity depending on season, elevation of aerial productivity, development of highly efficient microalgae species, development of low cost and highly efficient culture medium, technology of contamination improvement, and establishment of protocol for year-round culture and harvest [19, 20, 31, 32, 33].
Culture conditions of microalgae in ORS and designing of system are closely related with environment of selected area.
From 2008, small-scale (laboratory to 1.5 ton) experiments have been conducted to investigate the biomass production combined with culture conditions and low-cost medium of
2. System construction and strategies for culture plan
2.1. The production site
The city of Ansan was selected for the pilot study for production of
2.2. Construction of culture system and its structure
Figure 2 shows schematic processes for planning and construction of
Figure 4A is a vertical section of microalgae pilot system constructed based on BIM, in which the roof and side windows were designed with a maximal consideration of natural ventilation, and optimal construction cost and efficiency was realized by a four-way slide window at the side and the introduction of automatic opening and shutting system on the roof. Figure 4B is a horizontal section of the modified ORS culture facility. Each size of the culture facility was 10,000 (W) × 3250 (L) × 550 (H) mm, and the culture raceway was finished with concrete after vertical excavation of the ground as deep as 600 mm for the purpose of using geothermal heat as shown in Figure 4. Depth of medium for the culture was maintained as 400 mm. Boiler pipes were buried in the concrete floor of the modified ORS for maintenance of culture temperature in the winter.
Computational fluid dynamics (CFD) was conducted to analyze and optimize the mixing (e.g., water flow and paddle rotational speed) of medium with
2.3. The microorganism, experimental design, and culture conditions
The axenic culture of
2.4. Maintaining culture system
The electric boiler that was installed for maintenance of temperature in the winter was operated from late October to early April to heat the system electrically and to maintain optimal water temperature. The temperature of the culture medium was maintained between 20 and 25°C, and the water temperature for October when its operation was initially started was in the range of 21–23°C. Total electricity consumption during the period of boiler operation was measured by using an electronic watt-hour meter (LD3410CT-005Te). The boiler operation was set as a variable type depending on variation in water temperature (on 30 min, off 30 min), and the maximum operation rate (on 50 min, off 10 min) was used to minimize fluctuation of water temperature during the period of rapid drop in room temperature in the winter. Daily measurement values were summed every week and expressed in mean value ± standard deviation for an analysis of each environment and electricity consumption data.
2.5. Biomass concentration, harvesting, and productivity
Before harvesting, the biomass concentration was estimated by sampling and filtering 20 mL of each culture using a vacuum pump and GF/C filter paper (Whatman), and the filter paper was dried in a dry oven (65°C) for 24 h, followed by the measurement of biomass. Biomass was measured two times a week. For harvesting, cultured
Areal productivity was calculated by using the following equation. Data used for analysis were monthly mean value (mean value ± standard deviation) by adding the weekly measurement values.
where Odepth is the pond operating depth.
2.6. Analysis of biochemical components and pigments
The crude biochemical composition of cultured
For phycocyanin analysis, dried
For chlorophyll-
2.7. Measurement of climatic and culture conditions
Various parameters of the system were measured on a daily basis including room temperature (TENMARS) and light intensity (Lux Meter TM-205), water temperature (UNIS thermometer), pH (pH METER D-51, HORIBA), and salinity (SALT MATER YK-31SA). Although humidity was not a variable of interest, it seems the humidity was dropping in the plant as the level of medium kept in the plant was consistently lowering by evaporation. Evaporation amount was measured during August when culture medium was highly evaporated. To specify the amount of water being evaporated each day per unit area (m2), daily evaporation rate was measured and then averaged as ml/m2/h. The amount of evaporation was then supplemented daily with underground tap water in KIOST (HCO34 6.4 mg/L, Ca 20 mg/L, Cl 13.6 mg/L, SO42− 11.4 mg/L, Na 8.64 mg/L, Mg 3.99 mg/L, K 1.97 mg/L, T-N 1.66 mg/L, NO3-N 1.61 mg/L, T-P 0.02 mg/L, Co, Mo, and B 0 mg/L while Fe, Zn, Cu and Mn were not detected, and pH was 7.3).
A statistical program (IBM SPSS, NY, USA) was used for statistical analysis in order to test significance of environmental factors and pigments and biomass of
3. A feasibility of Spirulina annual production in the area
Disadvantages for
2011 | 2012 | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Jan | Feb | Mar | |
WT | 22.4 ± 1.3 | 23.3 ± 1.7 | 25.2 ± 1.9 | 27.7 ± 2.4 | 29.0 ± 1.8 | 25.6 ± 1.9 | 21.2 ± 1.8 | 23.9 ± 2.4 | 21.3 ± 1.8 | 19.5 ± 1.4 | 20.4 ± 2.2 | 22.6 ± 1.6 |
RT | 29.3 ± 4.1 | 26.4 ± 4.1 | 28.1 ± 3.8 | 34.8 ± 8.0 | 37.0 ± 4.6 | 35.9 ± 6.2 | 28.2 ± 3.5 | 22.9 ± 4.8 | 14.0 ± 3.6 | 10.8 ± 4.5 | 10.8 ± 4.8 | 15.7 ± 3.9 |
SR | 822.2 ± 460.2 | 480.4 ± 397.6 | 519.4 ± 391.4 | 219.4 ± 179.4 | 351.0 ± 318.6 | 604.4 ± 377.1 | 382.2 ± 330.2 | 354.2 ± 351.8 | 328.0 ± 214.7 | 336.4 ± 310.8 | 371.8 ± 344.7 | 317.4 ± 404.6 |
Salinity | 16.2 ± 0.1 | 15.6 ± 1.3 | 16.5 ± 0.8 | 18.1 ± 0.7 | 16.5 ± 1.6 | 16.3 ± 0.8 | 17.0 ± 0.4 | 16.2 ± 0.9 | 17.5 ± 1.3 | 16.4 ± 1.4 | 15.3 ± 1.9 | 13.5 ± 0.9 |
pH | 9.69 ± 0.2 | 10.4 ± 0.1 | 10.3 ± 0.2 | 10.4 ± 0.3 | 10.4 ± 0.3 | 11.1 ± 0.4 | 10.5 ± 0.1 | 10.5 ± 0.1 | 10.6 ± 0.3 | 10.3 ± 0.3 | 10.2 ± 0.2 | 10.0 ± 0.1 |
TEC | 290.6 | 72.5 | 42.0 | 38.9 | 39.1 | 38.5 | 144.4 | 331.6 | 475.3 | 453.2 | 440.6 | 389.9 |
Temperature of culture medium showed a change in a range of 20.2–26.8°C from April 4, 2011 to May 31. The highest water temperature of the year was 33.0°C on July 26 as an effect of increase in outer temperature. In addition, the average evaporation rate in August 2011 was 701 ± 136.4 ml/m2/h. Water temperature gradually decreased from October, went below 20°C during the second week of December and recorded the lowest water temperature of the year at 16.0°C on February 23, 2012. Culture medium temperature for optimal growth of
The mean initial salinity of May and June was 16.6 ± 0.9 psu due to the effect of added tap water. As culture days increase, salinity concentration showed a range of change between 13.1 and 18.4 psu during the year due to effects of evaporation of culture medium and supplementation of freshwater. In addition, the mean salinity concentration during the entire culture period was 16.5 ± 1.3 psu. The pH change during the culture period showed a relatively small variation between 9.9 and 11.9. Variation of pH from May 4, 2011 to September 9 was between 9.9 and 10.97, pH change between September 14 and September 30 was ranging between 11.15 and 11.90, and then it went down to below 11.0 from October 4. The ending pH on March 16 was 9.97. Internal room temperature of the plant during the culture period was in the range of 3.2–55.0°C, and the mean room temperature was 24.3 ± 10.5°C. The mean total electricity consumption (kWh) of the microalgae pilot plant was 10.3 ± 1.1 kWh per day during the initial culture between April 4, 2011 and May 4, during which the boiler was operated for maintenance of optimal medium temperature (20.2–26.1°C). Boiler operation was stopped between May 6, 2011 and October 16, 2011 for optimal temperature, during which 1.3 ± 0.6 kWh of electricity was used on average per day.
The range of biomass of
2011 | 2012 | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Jan | Feb | Mar | |
Biomass (g/L) | 0.57 ± 0.4 | 0.96 ± 0.2 | 1.02 ± 0.1 | 1.19 ± 0.2 | 1.26 ± 0.2 | 0.97 ± 0.1 | 0.75 ± 0.2 | 0.88 ± 0.2 | 1.01 ± 0.1 | 0.96 ± 0.1 | 0.96 ± 0.1 | 0.95 ± 0.2 |
Producti-vity (g/ m2/d) |
14.2 ± 9.6 | 23.92 ± 5.5 | 25.38 ± 3.5 | 29.65 ± 3.8 | 31.42 ± 4.8 | 24.26 ± 3.1 | 18.81 ± 4.3 | 21.95 ± 3.9 | 25.20 ± 3.3 | 24.09 ± 3.0 | 23.97 ± 3.3 | 23.65 ± 5.2 |
Cultivation system | Culture volume (L) | Productivity (g/m2/d) | Species | Location | References |
---|---|---|---|---|---|
Raceway | 600 | 5–40 | Japan | Matsumoto et al. [63] | |
Raceway | — | 1.6–3.5 | Spain | Garcia et al. [64] | |
Raceway | 110 | 20–37 | Perth, Australia |
Moheimani and Borowitzka [29] | |
Raceway | 750 | 15–27 | Israel | Richmond et al. [46] | |
Raceway | — | 8.2 | USA (California) | Belay [65] | |
Raceway | 282 | 14.47 ± 0.16 | Italy | Pushparaj et al. [25] | |
Raceway | 135,000 | 2–17 | Spain | Jimenez et al. [15, 37] | |
Raceway | — | 9–13 | Mexico | Olguin et al. [66] | |
Raceway | 500 | 11.2 | Japan | Matsumoto et al. [67] | |
Raceway | 300–600 | 5–26 | Italy | Pedroni et al. [68] | |
Inclined thin layer pond | 1000 | 10–30 | Czech Republic and Spain | Doucha and Livansky [69] | |
Inclined thin layer pond | ~2500 | 19 | Rupite, Bulgaria | Dilov et al. [70] | |
Circular central pivot pond | 1960 | 1.61–16.47 | Japan | Kanazaqa et al. [71] | |
Open culture system | 2400–16,200 | 19–22 | China | Tsukuda et al. [72] | |
Semi-open raceway | 10,000–15,000 | 5.68–37.67 | Ansan, South Korea | In this study |
Table 4 presents year-round ratios of protein, carbohydrate (CHO), and lipid contents in
2011 | 2012 | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Jan | Feb | Mar | |
Protein (%) | 40.08 | 37.77 | 36.98 | 47.64 | 46.48 | 40.62 | 32.26 | n.d. | n.d. | 25.19 | 23.71 | 31.10 |
CHO (%) | 36.81 | 28.04 | 20.06 | 25.16 | 28.52 | 37.47 | 47.35 | n.d. | n.d. | 51.37 | 42.19 | 42.92 |
Lipid (%) | 7.16 | 20.68 | 11.03 | 9.13 | 8.01 | 7.29 | 5.90 | n.d. | n.d. | 4.43 | 5.77 | 8.17 |
Ash (%) | 10.30 | 10.64 | 24.66 | 14.24 | 13.42 | 10.44 | 9.03 | n.d. | n.d. | 11.31 | 24.24 | 12.98 |
Moisture (%) | 5.66 | 2.87 | 7.27 | 3.83 | 3.56 | 4.18 | 5.47 | n.d. | n.d. | 7.70 | 4.09 | 4.82 |
Chlorophyll a (mg/g) | 6.1 ± 0.1 | 4.2 ± 0.1 | 3.3 ± 1.6 | 5.6 ± 1.8 | 6.3 ± 2.0 | 3.9 ± 0.6 | 3.0 ± 0.1 | n.d. | n.d. | 1.7 ± 0.1 | 1.8 ± 0.6 | 2.7 ± 0.1 |
Phycocyanin (mg/g) | 28.5 ± 0.9 | 28.7 ± 8.5 | 14.8 ± 3.1 | 53.5 ± 11.6 | 80.7 ± 9.3 | 91.1 ± 4.6 | 64.6 ± 13.1 | n.d. | n.d. | 25.9 ± 0.8 | 24.5 ± 9.5 | 55.1 ± 0.9 |
Year-round contents of phycocyanin
4. Conclusion
A glass greenhouse pilot plant for microalgal culture fitting to temperate climate was designed based on 3D modeling designing BIM technology in KIOST. The bottom of the raceway system was placed 600 mm deep into the ground, and culture depth was kept at 400 mm, so that heat energy was efficiently stored in order to maintain thermal effects for a long time, and its structure was helpful in maintaining optimal temperature even in the winter.
Acknowledgments
This research was supported by collective research grants from the Korea Institute of Ocean Science & Technology (PE99511). Also, this paper was studied with the support of ‘Development of integrated technologies for developing biomaterials using by magma seawater’ (PM60110) and the ‘Marine Biotechnology Program’ funded by Ministry of Ocean and Fisheries, Korea.
Thanks
We would like to thank the staffs of the Research Group of Integrated Use of Marine Biomass of Jeju International Marine Science Center in Korea Institute of Ocean Science and Technology (KIOST), who supported and collected the annual data. Our research activities were strongly supported by the KIOST and Ministry of Ocean and Fisheries.
Nomenclature
AOAC | the association of official analytical chemists |
BIM | building information modeling |
CFD | computational fluid dynamics |
CHO | carbohydrate |
GF/C | glass microfiber |
KIOST | Korea Institute of Ocean Science and Technology |
KWh | kilowatt hour |
NIST | National Institute of Standards and Technology |
ORS | open raceway system |
PBR | photobioreactor |
PE | polyethylene |
PSU | practical salinity unit |
RPM | revolutions per minute |
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