This research presents the effect of hydrodynamic conditions at different rates of aeration (1.4, 1.8, and 2.3 vvm) and the geometry of two photobioreactors with internal lighting on lipid productivity and other parameters of Chlorella vulgaris. A two-step nitrogenreduction cultivation mode was applied for promoting lipid accumulation. The inoculum was cultivated initially at 90 mg L −1 N-NH 4 + , and at the end of the exponential phase, it was fed to 11 L photobioreactor at 20 mg L −1 of N-NH 4 +. The results showed that with similar aeration rates, the hydrodynamic regime in both photobioreactors was different. However, the increase in shear rate and agitation did not cause cell damage or photoinhibition. The maximum cell growth was 12 × 10 6 cells mL −1. The highest consumption of nitrogen was 19% and shear rates were of 120-340 s −1. The highest lipid productivity was reached in bubble column at 1.8 vvm with 0.650 mg•L −1 d −1 .

This paper analyzed decarbonization technologies that reduce carbon dioxide emissions in multifamily buildings. The research method is deductive, quantitative approach, applied orientation, descriptive, correlational, and explanatory. The design is non-experimental, cross-sectional, and prospective. The results show that the reduction of carbon dioxide emissions using decarbonization technologies in housing projects is higher in terms of electrification and the use of biomass in materials modeling. At the same time, they are considerably lower in terms of energy efficiency and renewable energy. Finally, it was found that reducing carbon dioxide in multifamily housing contributes significantly to the economy and contributes to national and international environmental improvements, creating increasingly healthy spaces.