microalgae

Wastewater from human settlements contains a significant amount of organic and biogenic substances. Insufficiently treated wastewater enters surface water and leads to their eutrophication. The usage of microalgae in wastewater treatment has significant advantages in comparison with other methods of removing biogenic substances. Namely: effective and simultaneous removal of nitrogen and phosphorus without reagents management facilities, oxygen formation. Using microalgae in wastewater treatment is a new environmentally friendly biotechnological method.

The effect of light wave length on the rate of carbon dioxide absorption by microalgae has been studied. The mechanism of transfer of carbon dioxide from the air into the internal environment of the cells of microalgae has been described. The coefficient of microalgae growth based on the mathematical model has been determined. The analytical dependence of the mentioned coefficient on the light wave length has been obtained. The optimum length of light wave has been determined to design the flow chart for eliminating carbon dioxide from industrial gas emissions by the biological method.

The article deals with the investigation of the influence of sulfur compounds concentration on the cultivation of microalgae Chlorella vulgaris for the purpose of future use of flue gases as a nutrient source. The alteration of culture medium pH and microalgae biomass production under simultaneous injection of CO2 and H2SO4 or Na2SO3 are studied. It is shown that the enhancement of sulphur concentration to 0.44 g/L by using Na2SO3 increases the biomass growth by 15 percent and does not cause deviations from the optimal pH range.

The processes of absorption and transformation of carbon dioxide into methane are investigated. The prospects of use of the biochemical methods to transform carbon dioxide into methane are investigated. The technological scheme of microalgae biomass biometanization is  proposed. Досліджено процеси, що супроводжують поглинання та трансформацію вуглекислого газу у метан. Показано перспективу застосування біохімічних методів для трансформації вуглекислого газу у метан. Запропоновано технологічну схему біометанізації біомаси мікроводоростей.

Досліджено вплив довжини світлової хвилі на швидкість поглинання вуглекис-
лого газу мікроводоростями. Описано механізм транспорту вуглекислого газу із повітря
у внутрішнє середовище клітини мікроводорості. На основі математичної моделі
приросту мікроводоростей визначено коефіцієнт приросту. Отримано аналітичну залеж-
ність коефіцієнта приросту мікроводоростів від довжини світлової хвилі. Встановлено
оптимальні довжини світлових хвиль для проектування технологічних схем

The carbon dioxide absorption by unicellular microalgae has been studied. The stages of the process have been examined taking into account the peculiarities of cultivation conditions, in particular the presence of cellular and intercellular environment. The constants realizing the mathematical model of carbon dioxide absorption from the air by microalgae cells have been determined. The obtained results allow to predict the absorption kinetics and develop the equipment for gas wastes cleaning while implementation of the industrial process.