#TITLE_ALTERNATIVE#

• Main Author: HALOMOAN, NICO
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/29622
• Institution: Institut Teknologi Bandung

<p align="justify">Research to examine the variation of mass flow rate of carbon dioxide (CO₂) and <br /> <br /> the overall mass transfer coefficient (kLa) has been done to find ways in reducing CO₂ emissions by using Carbon Capture and Sequestration scenario. This <br /> <br /> research is conducted according to microalgae scenedesmus obliquus activity, which is cultivated using a bubble column photobioreactor through the mass transfer process. In a bubble column photobioreactor, it is assumed that well mixed occurs. Mass transfer coefficient or kLa(CO₂) is a common parameter that is often used to assess the performance of the photobioreactor in the process for cultivating algae, besides to calculate CO₂ removal efficiency. To determined the mass transfer coefficient, CO₂ concentration input, CO₂ output and dissolved CO₂ measured with acidy alkalinity test. As a comparison, the rate of growth is <br /> <br /> measured by calculating the biomass concentration (dry weight) content and cell density of microalgae. Flow rate used in this research were 2 L/min, 5 L/min and <br /> <br /> 8 L/min, with each rate flowed into the photobioreactor with CO₂ concentration of 2%, 5% and 10%. The results showed that the variation of flow rate will affect the amount of mass transfer coefficient. Higher flow rate means smaller value of kLa. The highest CO2 removal efficiency occurred at a flow rate of 5 L/min. Variations in flow rate also affects the growth rate and cell density microalgae kLa(CO₂) value is the highest on 0.3582 day-1 at a concentration of 2% CO₂ and at flow rate of 2 L/min, while the lowest is on 0.0503 day-1 at a concentration of 5% CO₂ and flow rate of 8 L/min. the rate of growth of microalgae in a photobioreactor, the largest rate occurs at pH point from 6.2 to 6.4 which is at neutral pH conditions. In terms of solubility is inversely proportional to the flow rate, the less carbon <br /> <br /> dioxide is dissolved at the rate of 8 L / min as well as the value of the KLA. Influence on biofixation and kLa (CO₂) fixation rate contrast, the increased in flow rate, mass transfer is been in microalgae culture, but the good mass transfer is not comparable to productivity of microalgae produced, because thebiofixation of carbon dioxide is influenced by the carbon content in microalgae and productivity of microalgae growth. Carbon number marginalized in this process will be used microalgae with carbon dioxide fixation, the amount used depends on productivity of microalgae and microalgae are few in number, most of the <br /> <br /> carbon dioxide that eliminated the process of passive diffusion. <p align="justify">