Effect of fermentation time and chicken manure extract concentration on Spirulina platensis (Nordst.) Geitler production characteristics
The optimal time interval of poultry waste fermentation for the nutrient medium preparation and increasing the cyanobacteria S. platensis production characteristics were established. The processing of poultry farm waste consisted in the preparation of model wastewater-water manure chicken extract (MCE) at different intervals of its fermentation (3, 21 and 30 days). For the first time, a comparative assessment of the S. platensis kinetic characteristics depending on the method of organic extract preparation (terms of chicken manure fermentations) was carried out. Fermentation of the MCE for 3 days provides the maximum kinetic characteristics of microalgae at all investigated extract concentrations. The minimum S. platensis growth characteristics were obtained using a 10% MCE after 21 and 30 days of fermentation. It was shown that at the MCE concentrations in cultivators of 20–30%, the maximum crop yield was higher than in the control by 11–15%. At the same time, it is possible to significantly reduce the material costs for the classical nutrient media preparation using mineral salts. The use of waste water from poultry farms as nutrient media for microalgae growing will solve the ecological problem of environmental pollution and reduce the cost of microalgae products several times.