Optimization of the energy source of microwaves cultivation process
DOI:
https://doi.org/10.31548/energiya2018.05.116Abstract
In recent years, in Ukraine, as well as in many countries of Europe, Asia and America, massive cultivation of microalgae has become widespread in order to use them in the national economy. In this plan, chlorella and spirulina are the most interesting.
The purpose of the research is to assess the energy efficiency of the microalgae cultivation process.
An experimental cultivator of the deep type has been developed to evaluate the energy efficiency of microalgae cultivation processes on sewage, study temperature regimes and irradiation and optimize them. The optimum parameters of the system of thermostabilization of the plant for growing microalgae can be determined from the equation of thermal balance, compiled for the most severe temperature conditions in the cultivating structure. Such conditions take place during the winter period of operation of the plant. From the analysis of dependencies, it follows that at low capacities of the flow water heater there is a long process of heating the suspension and high consumption of electric energy. However, when increasing power to the value at which the product PR exceeds 5tc, the energy performance of the water heater is stabilized.
The decisive condition for increasing the productivity of microalgae is the effectiveness of the use of optical radiation, which ensures the occurrence of physiological processes in cells and, above all, photosynthesis.
Analyzing the dependencies obtained, we can draw the following conclusions.
In cultivators for growing microalgae, where the culture is not stirred and its density is 50 million cells / ml, the depth of the layer of suspension should not exceed 10 cm.
Cultivation of microalgae in cultivators of deep type
is possible with the use of immersed moving sources of irradiation, which makes it possible to evenly irradiate the culture throughout the volume.
The growth rate of microalgae in cultivators with immersed mobile sources of optical irradiation is 1.5-2.0 times higher than with irradiation of culture by external sources and intensive mixing.
The cultivation of microalgae in deep-type cultivators is possible with the use of submerged moving sources of irradiation, which allows uniform irradiation of culture throughout the volume.
The growth rate of microalgae in cultivators with immersed mobile sources of optical irradiation is 1.5-2.0 times higher than with irradiation of culture by external sources and intensive mixing.
When irradiated with immersed and external sources of irradiation, the maximum growth rate is achieved with En / Esr = 3-5.
References
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Chmil, A.I. (2015). Enerhetychna efektyvnist i ekolohichna bezpeka zamknutykh ekoloho-biotekhnichnykh system v tvarynnytstvi [Energy efficiency and ecological safety of closed ecological and biotechnical systems in animal husbandry].. Kyiv, «Komprynt», 163.
Chmil A. I. (2015). Doslidzhennia enerhetychnoi doskonalosti biotekhnichnykh system u tvarynnytstvi [Research of energy perfection of biotechnical systems in animal husbandry]. Naukovyi visnyk NUBiP Ukrainy, 209 (2), 58-63.
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