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Muliani
Aquaculture Department, Agriculture Faculty, Malikussaleh University
Engineering Environmental Science Physics

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Analysis of Microalgae Growth Based on Availability of Nutrients in Freshwater Mainisa; Saiful Adhar; Muliani; Fendi Saputra; Sakinah Hsb
Proceedings of Malikussaleh International Conference on Multidisciplinary Studies (MICoMS) Vol. 3 (2022): Proceedings of Malikussaleh International Conference on Multidisciplinary Studies (MI
Publisher : LPPM Universitas Malikussaleh

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29103/micoms.v3i.182

Abstract

Microalgae have the potential to developed into medicinal products, wastewater treatment, food and energy products. Indonesia is a tropical country has the potential to produce microalgae. The growth of microalgae was influenced by several factors, the main factors is nutrition. This study aims to produce a pattern of mathematical relationships between microalgae growth and nutrient availability of the Laut Tawar Lake. Data collection was carried out for 30 days with a frequency of 7 days at 7 stations. Furthermore, the analysis was carried out to obtain concentration values of nitrate, phosphate and chlorophyll-a. Nitrate concentrations during the study ranged from 310-430 µg/L. The lowest average nitrate concentration was found at Station 4, which was 330 ± 34.64 µg/L and the highest was found at Station 3, which was 396.67 ± 41.63 µg/L. Phosphate concentrations during the study ranged from 18 – 22 µg/L. The highest phosphate concentrations were found at Station 1 and Station 6, which were 20.67 ± 0.58 µg/L and 20.67 ± 1.53 µg/L, and the lowest were found at Station 3, which were 19.00 ± 1.00 µg/L. The concentration of chlorophyll-a ranges from 5 – 12 µg/L. The highest average concentration of chlorophyll-a was obtained at Station 6, which was 10.00 ± 1.00 µg/L and the lowest was found at Station 3, which was 7.00 ± 2.00 µg/L. In conclusion, increasing nitrate in the Lake Laut Tawar did not increase microalgae biomass, microalgae species in that habitat were influenced by nutrient phosphate.
Biomass Production of Nannochloropsis sp Cultivated in Combination of Vanname Shrimp Culture Wastewater and Photoperiod as Important Step of Biodiesel Production Rachma Rusydi; Eva Ayuzar; Muliani; Munawwar Khalil; Indri Widia Wulandari; Momika Alfaini
Proceedings of Malikussaleh International Conference on Multidisciplinary Studies (MICoMS) Vol. 3 (2022): Proceedings of Malikussaleh International Conference on Multidisciplinary Studies (MI
Publisher : LPPM Universitas Malikussaleh

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29103/micoms.v3i.234

Abstract

Nannochloropsis sp becomes one of potential microalgae which has high lipid content and be explored as biodiesel feedstock. Cultivation of Nannochloropsis sp in appropriate manner, low cost, and sustain is the main approach to provide feedstock of biodiesel effectively. By utilizing vannamei shrimp culture wastewater combined to photoperiod, the biomass production of Nannochloropsis sp can be resulted optimally. The purpose of this study was to evaluate the combination of vannamei shrimp culture wastewater and photoperiod effectiveness in biomass production of Nannochloropsis sp for supporting biodiesel production. The study used experimental laboratory as its method and Factorial Completely Randomized Design as its experimental design. Two factors of treatments namely (1) different percentage of vannamei shrimp culture wastewater and (2) different photoperiod. The levels of first factor were A: Walne, B: 50% of wastewater, C: 75% of wastewater, and D: 100% of wastewater. Then, the levels of second factor were A: 6:18 (L:D), B: 12:12 (L:D), C: 18:6 (L:D), and D: 24:0 (L:D). The result showed that the highest biomass production was achieved by combination 75% of vannamei shrimp culture wastewater and photoperiod 12:12, in amount 12.75 ± 0.212 grams/L. Statistical analysis presented that different media of wastewater and different photoperiod significantly effect on biomass production of Nannochloropsis sp (p<0.05). Interaction of those two factors also significantly effect on biomass production of that microalgae (p<0.05). The recommendation of this study was the combination of vannamei shrimp culture wastewater 75% and photoperiod 12:12 (L:D) for Nannochloropsis sp cultivation.
Co-Authors Eva Ayuzar Fendi Saputra Indri Widia Wulandari Mainisa Momika Alfaini Munawwar Khalil Rachma Rusydi Saiful Adhar Sakinah Hsb