Abstract
Effect of environmental factors on the growth of the Chlorella vulgaris was studied. C. vulgaris was cultivated in sterilized natural seawater enriched with F/2-Si medium. Then grow in bucket, tub and photobioreactor (PBR) in outdoor condition. The daily routine work consisted of culture checkups of optical density, biomass gains, atmosphere lux, culture lux, atmosphere temperature and culture temperature were recorded. The highest biomass yields were (3.0 μg/ml-1) in December and (2.01 μg/ml-1) in November in PBR. The highest deviation was in atmosphere lux in time 8:30 (± 117.7) and lowest deviation was in atmosphere temperature in time 15:00 (± 1.0499). Optical density (OD) indicated that the best growth of C. vulgaris in outdoor condition was obtained in 650 lux and also it increased with increasing amount of lux. Tub report of C. vulgaris showed different growing behaviors at the various concentration of light and at the different temperatures. Algal production in outdoor PBR is relatively inexpensive, but is only suitable for a few, fast-growing specie. Finally, this fact is noteworthy that in outdoor conditions, temperature and light have important role in growth of C. vulgaris in present study. ©JASEM Keywords : Chlorella vulgaris , Biomass, Photobioreactor, Growth.
Highlights
Nowadays with increasing the population, the importance of microalgae to supply food and energy is universally recognized more than ever before
Changes in growth conditions or nutrient media characteristics can impact on quantity and quality of cells lipids (Mikulski 1982; Liu et al 2008).Chlorella vulgaris is a small green microalga. It size is 2-10 μm in diameter and has a high content of about 51-58% protein, 12-17% carbohydrate and 14-22% lipid it growth depends on environmental factors (Spolaore et al, 2006).The study of Seyfabadi et al (2010) showed a protein concentration in C. vulgaris with different conditions of light regimes can be reached of 33-46%
Fig (3, 4) presents the relationship between biomass and Optical density (OD) in November and December which indicated that the highest biomass yields were (3.0 mg/l in December) and (2.01 mg/l in November) cultured in 20-L in outdoor PBR
Summary
Nowadays with increasing the population, the importance of microalgae to supply food and energy is universally recognized more than ever before. Changes in growth conditions (temperature and light intensity) or nutrient media characteristics (concentration of nitrogen, phosphates, and iron) can impact on quantity and quality of cells lipids (Mikulski 1982; Liu et al 2008).Chlorella vulgaris is a small green microalga It size is 2-10 μm in diameter and has a high content of about 51-58% protein, 12-17% carbohydrate and 14-22% lipid (calculated as % of dry matter) it growth depends on environmental factors (Spolaore et al, 2006).The study of Seyfabadi et al (2010) showed a protein concentration in C. vulgaris with different conditions of light regimes can be reached of 33-46%. One of the important properties of C. vulgaris is that it can be grown both autotrophically (the cell collects the energy from the light through photosynthesis) and heterotrophically (the cell only requires a carbon source as energy) (Seyfabadi et al, 2010; Larsdotter, 2006). Molina et al (2000) reported that the used of PBRs for producing large amount of microalgae
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