Monthly average data of water temperature (WT), room temperature (RT), solar radiation (SR), salinity, pH, and total energy consumption in the microalgae pilot plant.
\r\n\t
\r\n\tSince they involve very small amounts of energy, high sound pressure levels are increasingly simpler and cheaper to emit. Noise is everywhere - it can be emitted as an energy waste by traffic or factories, but also by teenagers looking for loneliness in an overpopulated world.
\r\n\t
\r\n\tWhen the noise emission ends, it will not be possible to find its footprint in the environment, hence it is necessary to be in the right place at the right time to measure it. Moreover, having adequate instruments, updated protocols and trained personnel are mandatory to achieve that. Even then, decision makers must clearly understand the reported situation to decide the need and importance of taking further actions.
\r\n\t
\r\n\tThis book will address issues of noise in the city, in the neighborhood or at work, aspects about management and consequences of exposure to high sound pressure levels ranging from the auditory, extra-auditory and psychophysics effects to the addiction to noise and the loss of solidarity.
\r\n\t
\r\n\tThe book aims to provide a various points of view and analysis of cases regarding this omnipresent pollutant.
Spirulina (Arthrospira) is a 3.6-billion-year-old cyanobacterium and inhabits alkaline aquatic ecosystems from freshwater to seawater [1, 2]. As sustainable primary producers, the cyanobacteria have been studied on various aspects centered by bio-industry and environmental bioremediation [3, 4, 5, 6]. Spirulina that highly contains various functional materials has been focused as an important nutrition source for the future of humans and animal feeds, so that related industry has been gradually growing [2, 7, 8, 12]. In addition, the biomass plays an important role in broad ranges of industries [9, 10] and functional foods using proteins [3, 11]. In particular, S. platensis has been mostly studied for industrial production, in which the most important factors for an increase of production could be nutrient concentration, light intensity, and optimal water temperature [12]. Spirulina sp. including other microalgae are cultured on a large scale worldwide for industrial use [13, 14, 15, 16, 17]. Proteins and phytopigments (phycocyanin and β-carotene) along with polyunsaturated fatty acids from Spirulina are one of the high value-added materials that bring health to humans [2, 13, 18].
\nNowadays, 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].
\nCulture conditions of microalgae in ORS and designing of system are closely related with environment of selected area. Spirulina was the most widely used in outdoor cultivation trials and interests for commercial production have been increasing in many places based on the studies of intensive ecological and physiological research and development over four decades. However, this cyanobacterium needs high temperatures for optimal growth, thus commercial production has been limited until subtropical areas. In temperate regions, high temperatures are recorded in summer season, while the temperature is certainly low in fall and winter seasons. The overall temperature range should not be a suitable range for Spirulina growth in a year. Consequently, little information of commercial production has been reported in temperate areas [32, 34, 35]. Thus, an environmental analysis needs to be carried out on selected area for a culture system with maximal productivity based on which culture system needs to be constructed. Recently, the concept of building information modeling (BIM) developed in construction field was first introduced by the National Institute of Standards and Technology (NIST) of the Department of Commerce in the USA in 2007. BIM refers to a recent construction process that analyzes data with 3D modeling method using big data and information of the past and then applies it from designing to installation process, avoiding existing 2-D design. Therefore, BIM technology is advantageous due to cost saving for installation operation and prediction of future [36, 37, 38]. As shown in success cases such as the Disney Concert Hall of the US, the Olympic Main Stadium of Beijing, and Melbourne Recital Center, BIM technology has emerged as an important issue in architectural industry, so that it is considered beneficial to apply it to a microalgae production facility.
\nFrom 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 S. platensis and Spirulina maxima in Korea [33, 39, 40], but further progress was not reported. In 2011, the first pilot-scale Spirulina plant with semi-open raceway ponds was established in Ansan [41]. The purpose of this chapter is to present for construction technology of BIM-based ORS allowing year-round culture in the environment with four seasons, so that an ORS was constructed in a glass greenhouse structure and a culture study was performed on a pilot scale (173.5 m2). In addition, in order to verify sustainability of the system, year-round biochemical quality analyses on year-round batch culture of S. maxima that has a characteristic of strong alkaline culture and on produced-dried biomass were performed at the same time.
\nThe city of Ansan was selected for the pilot study for production of Spirulina. Ansan is located in Western South Korea (37.287°N, 126.833°E), about 30 km south of Seoul, on the coast of the Yellow Sea. Recent average temperatures generally exceed 30°C in summer, and in winter are above −5°C. The average temperature is 12.5°C, and number of sunny days per year generally ranged from 86 to 124, with >10 h of sun per day for the whole year. Mean monthly temperatures are shown in Figure 1A. Figure 1B shows that weekly average solar radiation ranged from 1721 to 5671 Wh/m2. From 2006 to 2010, the number of rainy days per year ranged from 99 to 138, and average annual rainfall was about 1150 mm in the locality of the cultivation area.
\nMean monthly temperature (A) and integrated weekly solar radiation (Wh/m2) (B) at the location of the study for past 5 years during 2006–2010.
Figure 2 shows schematic processes for planning and construction of Spirulina culture system using BIM technology. A pilot system for microalgae production was constructed in the Korea Institute of Ocean Science and Technology based on BIM technology which analyzes atmospheric environment data (temperature, solar radiation, and shadow effect etc., Figure 3) of the past for a long time, and predicts the future based on the data in order to design an optimal eco-friendly structure.
\nSchematic processes for planning and construction of Spirulina culture system using BIM technology.
The retrospective analysis of BIM based 3D modeling for visualization of shadow area at summer (A) and winter (B) solstices and estimation of monthly solar radiation of two raceway pond (C) at the location of the study for past 5 years during 2006–2010. Arrows indicates the location of culture area.
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.
\nA cross sectional view of the designed open raceway system for pilot production of Spirulina maxima using BIM analysis (patent no. 10–1,142,358, 10–1,142,359, 10–1,110,068). A: Vertical view of the system; a: Automatically opening and shutting window, b: 4-way sliding windows including anti-insect nets, c: Raceway pond, d: Paddle-wheel, e: Electronic boiler pipe, f: Concrete structure. B: Horizontal view of the system; main gate (g) has located to the south.
Computational fluid dynamics (CFD) was conducted to analyze and optimize the mixing (e.g., water flow and paddle rotational speed) of medium with S. maxima cells in the ORSs. The main purpose is to find the suitable rotational speed of the paddle to maximize mixing in the flow field. The commercial software Flow-3D (version 10.0) was chosen for this analysis. The simulation was performed by ARA Consulting & Technology Co., by applying two rotational speeds (15 and 30 rpm) (Figure 5). As a result, rotational speed was selected as 15 rpm in the ORSs. Simplified structures of the ORS and the greenhouse for S. maxima cultivation were shown in Figure 6.
\nSummarized results on mixing simulation of medium with S. maxima cells in the ORSs by applying CFD of flow-3D software. A: 3D applied raceway pond (10 m in length, 3.25 m in width and 0.6 m in depth) with paddle, B: Interface condition of boundary line by interactive boundary layer modeling techniques, C and D: Velocity magnitude and particles maps at 60 second after operation for various aspect of particles with different rotational speeds (C: 15 rpm, D: 30 rpm).
Simplified inner structure of ORS and the greenhouse for S. maxima cultivation at Ansan City, KIOST. The number of 20 was harvesting time and the number of 167 was the days after inoculation. Photographed by Taeho Kim in 2011.
The axenic culture of S. maxima Cy-23, was obtained from Korea Marine Microalgae Culture Center (Pukyong National University, Busan, Korea) and was initially inoculated in a 5 L conical flask containing modified Spirulina medium [42] at plant room temperature (23–30°C). Thereafter, secondary culture with scale up was performed in a 300-L PE circular cylinder raceway on the 10th day when the culture concentration of S. maxima reached to 0.5–0.8 g/L. Once concentration of secondary culture reached to 0.5–0.8 g/L on the 17th day, 20 tons of each culture medium with the same composition was made and added to the modified ORS. After 5 h, 300 L of sample from the secondary culture was inoculated. The rotational speed of the paddle wheel that circulates and mixes the culture medium was kept at 15 rpm. Batch culture was performed in the ORS for about 1 year from April 4, 2011 to March 16, 2012.
\nThe 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.
\nBefore 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 S. maxima samples in 3 tons of culture medium were harvested by using a Tubular Separator (GQLY series) at 15,000 rpm for 3 h in an interval of a week. Harvested samples were kept in a −50°C deep freezer (DEASAN) for a biochemical analysis and then freeze-dried by using a freeze dryer (ILSHIN).
\nAreal 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.
\nwhere Odepth is the pond operating depth.
\nThe crude biochemical composition of cultured S. maxima was determined according to the AOAC method [43]. Crude carbohydrate was determined by the phenol–sulfuric acid reaction, crude lipid was extracted by the Soxhlet method, and crude ash was prepared at 550°C in the dry-type furnace. The moisture was determined by keeping the sample in a dry oven at 105°C for 24 h and the crude protein was determined by the Kjeldahl method. Unfortunately, the samples of November and December 2011 were denatured by sudden trouble of refrigerator for biochemical and pigments analysis.
\nFor phycocyanin analysis, dried S. maxima powder was weighted accurately to 50 mg, and then mixed with 10 mL sodium phosphate buffer (pH 7.0) in centrifuge tube. The mixed sample was sonicated for 1 min and stored in refrigerator overnight maintained at 20°C. The sample was mixed well using vortex and then was centrifuged for 20 minutes at 10°C at 3000 rpm. The supernatants were repeatedly collected until the color came off. After collecting all the phycocyanin, the supernatant was filtered using GF/C filter, and the red absorbency of each replicate was at 620 and 652 nm using phosphate blank buffer with spectrophotometer (Optizen POP bio). Concentration of phycocyanin was then calculated using below formula [44].
\nFor chlorophyll-a analysis, dried A. maxima powder was weighted accurately at 50 mg and then mixed with 5 mL-90% acetone. The mixed sample was sonicated for 1 min and then stored in refrigerator for 30 min maintained at 4°C. The pigment extracts have to be kept on ice and in the dark. The sample was mixed well using vortex and then was centrifuged for 20 minutes at 10°C at 3000 RPM. The supernatants were repeatedly collected until the color came off. After collecting all the chlorophyll, the supernatant was filtered using a 0.2 μm syringe filter, and the absorbency of each replicate was at 625, 647, and 664 nm using phosphate blank buffer with spectrophotometer (Optizen POP bio). Concentration of chlorophyll was then calculated using below formula [45].
\nVarious 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).
\nA statistical program (IBM SPSS, NY, USA) was used for statistical analysis in order to test significance of environmental factors and pigments and biomass of S. maxima (one way ANOVA, Tukey test, P values <0.05). Monthly variations among climatic and culture conditions, biomass, biochemical components, and pigment concentrations were statistically analyzed by one way ANOVA with Pearson’s multiple range tests at p < 0.05 (SPSS version 12.0, NY, USA) for the identification of significant seasonal differences during the study period. All analyses were performed on triplicate samples.
\nDisadvantages for Spirulina production in this area are not only the average temperature (12.5°C), but putative aerial contamination of the medium by the dusts and microorganisms from reclaimed land in the City. The period of cultivation would be approximately <200 days for growing in open raceway ponds in this region without trials to control the disadvantages. In order to overcome the problems, the most important approach in annual cultivation in this area was to construct greenhouse over the raceway ponds. The greenhouse was made of a framework (mixture of steel and cement) and transparent glasses. The glass greenhouse enhances the culture temperature significantly (Table 1) and the growth period prolonged during a year. The maximum daily medium temperature of the culture was over 20°C and up to 30°C during the period from January to August. Table 1 and Figure 7 present year-round change data of radiation amount (μmol/m2/s), temperature of culture medium, room temperature, salinity, pH, and electricity consumption during the culture of S. maxima from April 2011 to March 2012. As for illumination intensity during the study period, the maximum value was 1590 μmol/m2/s, and the minimum value was 7 μmol/m2/s. Year-round water temperature of culture raceway for S. maxima was between 16.0 and 33.0°C, and mean water temperature was 23.6 ± 3.2°C.
\n\n | 2011 | \n2012 | \n||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Apr | \nMay | \nJun | \nJul | \nAug | \nSep | \nOct | \nNov | \nDec | \nJan | \nFeb | \nMar | \n|
WT | \n22.4 ± 1.3 | \n23.3 ± 1.7 | \n25.2 ± 1.9 | \n27.7 ± 2.4 | \n29.0 ± 1.8 | \n25.6 ± 1.9 | \n21.2 ± 1.8 | \n23.9 ± 2.4 | \n21.3 ± 1.8 | \n19.5 ± 1.4 | \n20.4 ± 2.2 | \n22.6 ± 1.6 | \n
RT | \n29.3 ± 4.1 | \n26.4 ± 4.1 | \n28.1 ± 3.8 | \n34.8 ± 8.0 | \n37.0 ± 4.6 | \n35.9 ± 6.2 | \n28.2 ± 3.5 | \n22.9 ± 4.8 | \n14.0 ± 3.6 | \n10.8 ± 4.5 | \n10.8 ± 4.8 | \n15.7 ± 3.9 | \n
SR | \n822.2 ± 460.2 | \n480.4 ± 397.6 | \n519.4 ± 391.4 | \n219.4 ± 179.4 | \n351.0 ± 318.6 | \n604.4 ± 377.1 | \n382.2 ± 330.2 | \n354.2 ± 351.8 | \n328.0 ± 214.7 | \n336.4 ± 310.8 | \n371.8 ± 344.7 | \n317.4 ± 404.6 | \n
Salinity | \n16.2 ± 0.1 | \n15.6 ± 1.3 | \n16.5 ± 0.8 | \n18.1 ± 0.7 | \n16.5 ± 1.6 | \n16.3 ± 0.8 | \n17.0 ± 0.4 | \n16.2 ± 0.9 | \n17.5 ± 1.3 | \n16.4 ± 1.4 | \n15.3 ± 1.9 | \n13.5 ± 0.9 | \n
pH | \n9.69 ± 0.2 | \n10.4 ± 0.1 | \n10.3 ± 0.2 | \n10.4 ± 0.3 | \n10.4 ± 0.3 | \n11.1 ± 0.4 | \n10.5 ± 0.1 | \n10.5 ± 0.1 | \n10.6 ± 0.3 | \n10.3 ± 0.3 | \n10.2 ± 0.2 | \n10.0 ± 0.1 | \n
TEC | \n290.6 | \n72.5 | \n42.0 | \n38.9 | \n39.1 | \n38.5 | \n144.4 | \n331.6 | \n475.3 | \n453.2 | \n440.6 | \n389.9 | \n
Monthly average data of water temperature (WT), room temperature (RT), solar radiation (SR), salinity, pH, and total energy consumption in the microalgae pilot plant.
WT: water temperature (°C); RT: room temperature (°C); SR: solar radiation (μmol/m2/s); TEC: total energy consumption (kWh).
Annual variations of daily data on medium water temperature (A), room temperature (B), solar radiation (C), salinity (D), pH (E) and use of total electric power (F) in the S. maxima culture pond during the period from April 4, 2011 to March 16, 2012.
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 Spirulina was between 35 and 37°C, and should be kept at least at 15–20°C [2]. Since severe air temperature in this area was recorded from −18 to 36°C, and it was below 10°C on average in the winter, the ORS with glass greenhouse was electrically heated by the boiler during the period from late October to early April to maintain at least 15°C, the lowest temperature for Spirulina culture. These results should serve as fundamental data for setting temperature and running a boiler in order to maintain optimal medium temperature in the winter.
\nThe 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.
\nThe range of biomass of S. maxima that was produced year-round using batch culture method in the raceway system with glass greenhouse structure in the present study was 5.68–37.67 g/m2/d, in which the highest productivity of the year was recorded as 37.67 g/m2/d in the summer when temperature increased. According to a study on S. platensis culture in a raceway system (750 L) by Richmond et al. [46], productivity was 15–27 g/m2/d, whereas a study on culture of S. platensis in a raceway system (135,000 L) conducted in Spain showed 2–17 g/m2/d [47]. Considering that limiting factors important for growth and productivity of microalgae are solar radiation, carbon supply, water temperature, and dissolved oxygen [5, 46, 48], a control system on these factors are also critical. BIM designing technology that was introduced in the present study to predict these effects had advantages including investigation of spatiotemporal relevance of construction using 3D modeling, and prediction of problematic factors in advance including an analysis of environmental interference as known already [36, 37, 38], which resulted in desirable Spiruina biomass produced from the facility that designed based on an environmental analysis (atmospheric temperature and radiation amount) known as major factors of S. maxima growth, and predictions of environmental interference (e.g., shadow effect in Figure 3). Table 2 and Figure 8 show year-round biomass of S. maxima during the culture between April 8, 2011 and March 15, 2012.Variations of biomass and daily productivity were 0.227–1.507 g/L and 14.2 ± 9.6–31.42 ± 4.8 g/m2/d, respectively, during the culture period, and mean values were 0.96 ± 0.24 g/L and 24.2 ± 5.90 g/m2/d, respectively. The mean daily productivity of April when culture was started was 14.2 ± 8.1 g/m2/d. The mean daily productivity gradually increased from May reaching to 23.92 ± 2.98 g/m2/d. Thereafter, there were changes in productivity due to harvest of S. maxima for component analysis and supplementation of freshwater for evaporation of culture medium. The highest productivity of the year (31.42 ± 4.8 g/m2/d) was achieved in August when temperature of culture water was high, which was statistically significant (p < 0.05), and the lowest productivity of the year (18.81 ± 4.3 g/m2/d) was recorded in October. When comparing the results of this study with most preceeding studies, the raceway system with a glass greenhouse structure in the present chapter achieved the maximum aerial productivity (Table 3). In addition, despite the continuous study in batch culture method without resupply of nutrients, a high aerial productivity (24.2 g/m2/d) in annual average was obtained. Thus, it has confirmed a foundation to use a raceway system with a glass greenhouse structure or photobioreactor for countries with four distinct seasons.
\n\n | 2011 | \n2012 | \n||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
\n | Apr | \nMay | \nJun | \nJul | \nAug | \nSep | \nOct | \nNov | \nDec | \nJan | \nFeb | \nMar | \n
Biomass (g/L) | \n0.57 ± 0.4 | \n0.96 ± 0.2 | \n1.02 ± 0.1 | \n1.19 ± 0.2 | \n1.26 ± 0.2 | \n0.97 ± 0.1 | \n0.75 ± 0.2 | \n0.88 ± 0.2 | \n1.01 ± 0.1 | \n0.96 ± 0.1 | \n0.96 ± 0.1 | \n0.95 ± 0.2 | \n
Producti-vity (g/ m2/d) | \n14.2 ± 9.6 | \n23.92 ± 5.5 | \n25.38 ± 3.5 | \n29.65 ± 3.8 | \n31.42 ± 4.8 | \n24.26 ± 3.1 | \n18.81 ± 4.3 | \n21.95 ± 3.9 | \n25.20 ± 3.3 | \n24.09 ± 3.0 | \n23.97 ± 3.3 | \n23.65 ± 5.2 | \n
Monthly average data of biomass and productivity of S. maxima in the microalgae pilot plant.
n.d.: not determined.
Cultivation system | \nCulture volume (L) | \nProductivity (g/m2/d) | \nSpecies | \nLocation | \nReferences | \n
---|---|---|---|---|---|
Raceway | \n600 | \n5–40 | \nTetraselmis sp. | \nJapan | \nMatsumoto et al. [63] | \n
Raceway | \n— | \n1.6–3.5 | \nDunaliella salina | \nSpain | \nGarcia et al. [64] | \n
Raceway | \n110 | \n20–37 | \nDunaliella salina | \nPerth, Australia | \nMoheimani and Borowitzka [29] | \n
Raceway | \n750 | \n15–27 | \nSpirulina platensis | \nIsrael | \nRichmond et al. [46] | \n
Raceway | \n— | \n8.2 | \nSpirulina platensis | \nUSA (California) | \nBelay [65] | \n
Raceway | \n282 | \n14.47 ± 0.16 | \nSpirulina platensis | \nItaly | \nPushparaj et al. [25] | \n
Raceway | \n135,000 | \n2–17 | \nSpirulina sp. | \nSpain | \nJimenez et al. [15, 37] | \n
Raceway | \n— | \n9–13 | \nSpirulina sp. | \nMexico | \nOlguin et al. [66] | \n
Raceway | \n500 | \n11.2 | \nTetraselmis sp. | \nJapan | \nMatsumoto et al. [67] | \n
Raceway | \n300–600 | \n5–26 | \nTetraselmis suecica | \nItaly | \nPedroni et al. [68] | \n
Inclined thin layer pond | \n1000 | \n10–30 | \nChlorella sp. | \nCzech Republic and Spain | \nDoucha and Livansky [69] | \n
Inclined thin layer pond | \n~2500 | \n19 | \nScenedesmus obliquus | \nRupite, Bulgaria | \nDilov et al. [70] | \n
Circular central pivot pond | \n1960 | \n1.61–16.47 | \nChlorella sp. | \nJapan | \nKanazaqa et al. [71] | \n
Open culture system | \n2400–16,200 | \n19–22 | \nChlorella sp. | \nChina | \nTsukuda et al. [72] | \n
Semi-open raceway | \n10,000–15,000 | \n5.68–37.67 | \nSpirulina maxima | \nAnsan, South Korea | \nIn this study | \n
Comparison of biomass productivities of various microalgal species in outdoor open pond culture (modified from Borowitzka et al. [61]).
Annual variation on the biomass concentration of two times weekly-harvested S. maxima during a culture period.
Table 4 presents year-round ratios of protein, carbohydrate (CHO), and lipid contents in S. maxima. Protein content of S. maxima in April 2011 when culture was started was 40.08%, which gradually increased to 47.64% in July, the highest. As culture period became longer, ratio of protein gradually decreased and recorded 23.71% in February 2012, the lowest of the year. Protein content was higher from the spring to the early fall compared to other components, which had significant correlations with temperature of culture medium and solar radiation (p < 0.05). Ratio of CHO was 36.81% in April 2011 when culture was started, which decreased to 20.06% in June. Ratio of CHO highly increased from September 2011, and reached a peak of 42.19% in January in 2012, which was contrasted to the content of protein. Thus, protein and CHO contents exhibited a significant inverse correlation depending on season (p < 0.05, r2 = 0.8542). Similar to the results of preceding studies, high protein contents were found in S. maxima, and changes in protein and CHO depending on season, and changes in pigment contents were also identified [49, 50, 51, 52, 53]. Markou et al. [54] reported that although CHO content of S. platensis was between 10 and 20% in general, the limitation of phosphorus components in nutrition source resulted in an increase to 60–65%. In addition, Markou et al. [55] reported that a control of medium components for S. platensis caused elevation of CHO content among general components in a study on conversion of microalgae components to bioethanol. CHO content in the present study on culture of S. maxima showed a year-round change between 20.06–51.37%, and significantly increased at the later stage of culture. Since the present study performed a year-round experiment in batch–culture method, it seems that nutrition sources including phosphorus component was limited at the later stage, which might have caused elevation of CHO content and reduction of protein content. Batista et al. [56] reported protein content of S. maxima as 44.9 ± 1.8%, and Usharani et al. [57] reported protein content of Spirulina as 55–70%. Protein content in the present study was 40.08% in the beginning of culture and 23.71–47.64% in year-round content. Protein contents of S. maxima in year-round culture were the highest in July 2011 and the lowest in January 2012. In addition, protein content was significantly correlated with medium temperature and solar radiation. Jacob-Lopes et al. [58] reported that the change of light cycles (day/night) was closely related with microalgae production, and production decreased as the condition of darkness continued. Protein contents of S. platensis increased to 70.90 ± 2.37% at sunrise, and became 57 ± 0.69% at sunset, indicating that it tends to remarkably decrease compared to the daytime [59]. On the contrary, it was reported that CHO content was higher at the sunset time (33.81 ± 0.66%) than the sunrise time (19.48 ± 1.48%). Thus, it would be necessary to study the maintenance of protein content by application of phosphate-feed condition and LED illumination environment after the early fall when temperature of culture medium and amount of sunlight decline.
\n\n | 2011 | \n2012 | \n||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
\n | Apr | \nMay | \nJun | \nJul | \nAug | \nSep | \nOct | \nNov | \nDec | \nJan | \nFeb | \nMar | \n
Protein (%) | \n40.08 | \n37.77 | \n36.98 | \n47.64 | \n46.48 | \n40.62 | \n32.26 | \nn.d. | \nn.d. | \n25.19 | \n23.71 | \n31.10 | \n
CHO (%) | \n36.81 | \n28.04 | \n20.06 | \n25.16 | \n28.52 | \n37.47 | \n47.35 | \nn.d. | \nn.d. | \n51.37 | \n42.19 | \n42.92 | \n
Lipid (%) | \n7.16 | \n20.68 | \n11.03 | \n9.13 | \n8.01 | \n7.29 | \n5.90 | \nn.d. | \nn.d. | \n4.43 | \n5.77 | \n8.17 | \n
Ash (%) | \n10.30 | \n10.64 | \n24.66 | \n14.24 | \n13.42 | \n10.44 | \n9.03 | \nn.d. | \nn.d. | \n11.31 | \n24.24 | \n12.98 | \n
Moisture (%) | \n5.66 | \n2.87 | \n7.27 | \n3.83 | \n3.56 | \n4.18 | \n5.47 | \nn.d. | \nn.d. | \n7.70 | \n4.09 | \n4.82 | \n
Chlorophyll a (mg/g) | \n6.1 ± 0.1 | \n4.2 ± 0.1 | \n3.3 ± 1.6 | \n5.6 ± 1.8 | \n6.3 ± 2.0 | \n3.9 ± 0.6 | \n3.0 ± 0.1 | \nn.d. | \nn.d. | \n1.7 ± 0.1 | \n1.8 ± 0.6 | \n2.7 ± 0.1 | \n
Phycocyanin (mg/g) | \n28.5 ± 0.9 | \n28.7 ± 8.5 | \n14.8 ± 3.1 | \n53.5 ± 11.6 | \n80.7 ± 9.3 | \n91.1 ± 4.6 | \n64.6 ± 13.1 | \nn.d. | \nn.d. | \n25.9 ± 0.8 | \n24.5 ± 9.5 | \n55.1 ± 0.9 | \n
Results of biochemical analysis of dry powder of S. maxima.
n.d.: not determined.
Year-round contents of phycocyanin S. maxima produced in the present study were 12–93 mg/g. Phycocyanin content (mg/g) of S. maxima was 28.5 ± 0.9 mg/g in April 2011 when culture was started. Then, it gradually decreased and the mean content became 14.8 ± 3.1 mg/g in June, which was the lowest. It showed a trend of increase from July, and the mean phycocyanin concentration of September 2012 was 91.1 ± 4.6 mg/g, which was the maximum of the year. Thereafter, phycocyanin contents again decreased and recorded 24.5 ± 9.5 mg/g in its mean value in February 2012. Chlorophyll-a content of S. maxima was 6.1 ± 0.1 mg/g in April 2011 when culture was started, and then the mean content was 6.3 ± 2.0 mg/g in August when radiation amount was relatively high, which was the highest of the year. Afterwards, chlorophyll-a concentration decreased to 1.8 ± 0.6 mg/g in February 2012, which was the lowest of the year. However, although content of chlorophyll-a was at the highest in the summer similar to the correlation between year-round contents of phycocyanin and amount of sunlight, there was no consistent year-round significance. In general, cell growth and phycocyanin production are closely related with light conditions [60, 61]. However, phycocyanin content was the highest in September 2011 when light conditions were the best in the present study, though there was no consistent significance throughout the year. Chlorophyll-a contents showed 6.3 ± 2.0 mg/g in August 2011, the maximum value, and 1.7 ± 0.1 mg/g in January 2012, the minimum value. It has been reported that as the light energy that microalgae received increased, chlorophyll contents also significantly increased [62], and the present study also showed the highest chlorophyll-a content in August when radiation amount was relatively high. Despite the significance of monthly pigment contents, however, there was no constant year-round significance between pigments and amount of sunlight.
\nA 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. S. maxima was continuously cultured for a year in batch culture without further supply of nutrients, and the raceway system with a glass greenhouse structure in the present chapter achieved the maximum aerial productivity compared with most previous studies.
\nThis 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.
\nThe authors declare no conflicts of interest.
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.
\nAOAC | 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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