Arthrospira platensis culture requires macro and micronutrients. The nutrients needed by Arthrospira platensis according to Agustina and Herman (2021) are macronutrients consisting of nitrogen (N), phosphorus (P), potassium (K), sulfur (S), iron (Fe), magnesium (Mg), silicon (Si), and calcium (Ca). Micronutrients consist of zinc (Zn), cobalt (Co), molybdenum (Mo), boron (B), and copper (Cu). Rice-washing wastewater contains macro and micronutrients needed for the growth of Arthrospira platensis. Almost all of the nutrients needed by Arthrospira platensis are found in the wastewater, except for Co. Previous studies have shown that rice-washing wastewater can be used for Arthrospira platensis culture, but the growth rate is still higher than Walne fertilizer 0.5 ml/L. Zarrouk fertilizer as a standard growth medium for Arthrospira platensis shows that this fertilizer has better growth results than Urea and NPK fertilizers. This research was conducted to determine the effect of rice-washing wastewater as a nutrient source for culture media or a combination of Zarrouk fertilizer and rice-washing wastewater so that it can be used to increase the biomass and carotenoid pigments of Arthrospira platensis. This research used a Factorial Completely Randomized Design (CRD) with 12 treatments and 3 replications. Arthrospira platensis quality test was carried out by testing dry biomass and carotenoid content. The ANOVA test results showed that this study's treatment had a significant effect on the carotenoid content and biomass of Arthrospira platensis. The treatment with the highest effect of biomass and carotenoids was obtained in the treatment of 1.5 ml/L of rice-washing wastewater
The purpose of this study was to determine the effect of NPK and liquid organic (POC) fertilizers on the growth, biomass, and phycocyanin of Spirulina platensis culture in a laboratory scale. The NPK fertilizer was carried out by giving 3 doses of 0.1 g/L, 0.2g/L, and 0.3 g/L and control. The POC Fertilizer was used in 3 doses of treatment of 10 mL/L, 15 mL/L, and 20 mL/L and control. The parameters observed for 8 days included growth rate, biomass, phycocyanin, and water quality parameters. The result showed the NPK fertilizer resulted in 80%, 70%, and 65% higher growth rates, biomass, and phycocyanin, respectively, than POC fertilizer. The application of NPK at a dose of 0.3 g/L gave the best treatment which resulted in a growth rate of 0.568 cells/day, biomass of 1.395 g/L and a phycocyanin content of 0.148 mg/L. The best treatment using POC was at a concentration of 20 mL/L which resulted in a growth rate of 0.459 cells/day, a biomass of 0.979 g/L, and a phycocyanin content of 0.097 mg/L. The culture with POC obtained a lower result than the NPK because the organic fertilizer requires a longer decomposition process to be utilized by Spirulina platensis.
Highlight Research S. platensis has been analyzed for its productivity. Analysis of the productivity of S. platensis on the use of fish culture wastewater media. S. platensis production can be increased by aquaculture wastewater. Aquaculture wastewater enhances the production of cell density, SGR, biomass, protein, and carotenoid of S. platensis. Abstract Increased productivity of Spirulina sp. in the form of high protein, carotenoids, and biomass content can be achieved by improving its nutrient supply. Inorganic fertilizers are nutrient sources, which are generally used in the culture of this organism on laboratory and industrial scale, but there are several drawbacks, including their high costs and limited availability. Several studies have also reported the use of zarrouk fertilizer as a standard culture medium for Spirulina platensis. Therefore, this study aims to determine the effect and the best concentration of fish culture wastewater treatment in Spirulina platensis culture using biomass, protein content, and carotenoid pigments as indicators. A two-factorial completely randomized designs (CRD) was used in this study, where the factors include the dose of organic waste and Zarrouk fertilizer. The microalgae samples, namely S. platensis were cultured using fresh water. This research consists of two factors. The first factor is the dose of organic waste, and the second factor is the dose of Zarrouk fertilizer. The wastewater treatment consisted of 0, 2, 4, and 6 ml/L, while Zarrouk dosages include 0, 0.5, and 1 ml/L. The best results were obtained from the sample treated with 6 ml/L aquaculture wastewater without the addition of Zarrouk. Furthermore, this treatment gave biomass production of 0.781 g/L, 50.441% protein, and 1.246 mg/L carotenoids. Based on the results, S. platensis culture can be carried out using fish culture wastewater without the addition of Zarrouk fertilizer.
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