Abstract
The effect of ammonia and iron concentration in Bold Basal Medium and mixed wastewater (including pretreated piggery wastewater and acid mine drainage) on biomass production and biochemical content (lipid and ß-carotene) of microalgae (Uronema sp. KGE 3) was investigated. Addition of iron to the Bold Basal Medium enhanced the growth, lipid, and ß-carotene of Uronema sp. KGE 3. The highest dry cell weight, lipid content, and lipid productivity of KGE 3 were 0.551 g L-1, 46% and 0.249 g L-1 d-1, respectively, at 15 mg L-1 of Fe. The highest ß-carotene was obtained at 30 mg L-1 of Fe. The biomass production of KGE 3 was ranged between 0.18 to 0.37 g L-1. The microalgal growth was significantly improved by addition of acid mine drainage to pretreated piggery wastewater by membrane. The highest dry cell weight of 0.51 g L-1 was obtained at 1:9 of pretreated piggery wastewater by membrane and acid mine drainage for KGE 3. The removal efficiencies of total nitrogen and total phosphate was ranged from 20 to 100%. The highest lipid and ß-carotene content was found to be 1:9. Application of this system to wastewater treatment plant could provide cost effective technology for the microalgae-based industries and biofuel production field, and also provide the recycling way for pretreated piggery wastewater and acid mine drainage.
Highlights
Microalgae synthesize contain valuable biomass compounds, such as lipid, ß-carotene, astaxanthin, and lutein [1,2]
The biodiesel can be derived from lipids of microalgae, which is achievable since microalgae contains up to 50% of lipid with respect to dry cell weight [4]
The kinetic assessment of specific growth rate of microalgae was evaluated. These results provide fundamental information to establish and cultivate the microalgae in Pipes inserted microalgae reactor (PIMR)
Summary
Microalgae synthesize contain valuable biomass compounds, such as lipid, ß-carotene, astaxanthin, and lutein [1,2]. Biofuel has been obviously reported as a source of renewable energy for superseding the fossil fuel [3]. The biodiesel can be derived from lipids of microalgae, which is achievable since microalgae contains up to 50% of lipid with respect to dry cell weight [4]. Microalgae have advantages like high photosynthetic efficiency, high productivity yield, non-arable land use, and ability to capture and utilize CO2 as a nutrient [5,6]. The nutrient concentration is one of the vital sources for successful of cultivation microalgal, and efficient and improved synthesis of microalgae biomass for subsequent production of biodiesel and ß -carotene has been reported [7]. The concern has been increasing towards the biomass production from microbial to absorb heavy metal ions and bioaccumulation [8,9]
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