Ankistrodesmus gracilis (Chlorophyta) fertilized in swine manure in the laboratory
Tatiana Betioli Fioresi | Lúcia Helena Sipaúba-Tavares
The objective of the present work was to investigate the influence of swine manure media on the growth, total length, dry weight, and nutritional value of Ankistrodesmus gracilis microalgae. Two media were measured: “in natura” and biodigested. The growth rate peak for A. gracilis was highest with biodigester treatment (6.2 x 107 cells.mL-1) on the 5th day, at a volume of 2L. The highest percentage of lipids was verifi ed for “in natura” media. Protein was highest (p > 0.05) for the biodigested media at 2L. Biovolume, ash rate, and total length were different (p < 0.05) between treatments, but the same was not true for dry weight and crude fiber (p > 0.05). Light demand was also different between media, with lesser intensity being required for biodigested media (13.5μE.cm-2.s-1). In fact, the biodigested media proved to be cheaper in terms of cost and benefit. Generally, the medium containing swine manure, both “in natura” and biodigested, showed better results in A. gracilis development, with water quality adequate for culture systems. Swine manure in both forms may also be used in high-density cultures in the laboratory.
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