This article explores the feasibility of producing biohydrogen from microalgae following their use in wastewater purification from food industry facilities and the removal of high levels of carbon dioxide (CO₂) from the air. The authors investigated various methods for disrupting the cell membranes of microalgae and their impact on biohydrogen yield. The microalgae biomass obtained after wastewater and air purification underwent pre-treatment using physicochemical and chemical methods, including microwave radiation, acid treatment, and thermal treatment. The highest hydrogen production occurred during thermal and acid treatments of biomass with the addition of starch (44.24 mL/L of suspension). The use of microwave radiation for processing did not yield significant results. A comparison of the biohydrogen values obtained from untreated and treated biomass revealed that treatment enhances biohydrogen yield.

This article presents an analytical review of current research on the biofixation of TPP emissions with microalgae. Microalgae are considered as promising microorganisms for carbon dioxide capture, the specific properties of CHP flue gases as a culture medium are characterized, and the influence of key process conditions, including CO2 concentration, illumination, temperature, pH, nutrient availability, and gas feed mode, is analyzed. Data on the use of various types of photobioreactors and flue gas feed schemes are summarized. It is shown that the efficiency of CO2biofixation depends significantly on the biological properties of the cultures used, as well as on the gas composition, the depth of its pretreatment, the design of the photobioreactor, and the chosen method for evaluating the results. Based on a comparison of literature data, it was established that the most promising candidates for biofixation of TPP emissions are members of the genera Chlorella, Scenedesmus, and Desmodesmus. Particular attention is given to the processing of the resulting biomass, primarily the production of feedstock for bioenergy and biofertilizers. It is concluded that further development of the technology involves selecting resistant strains, improving photobioreactors, optimizing cultivation modes, and transitioning to long-term pilot testing on real flue gases from power plants.