BIOFIKSASI CO2 OLEH MIKROALGA Spirulina sp DALAM UPAYA PEMURNIAN BIOGAS

Abstract

The main component of biogas CH4,it is a renewable energy product that is expected to be the fuel gas. However, the presence of CO₂ in the biogas decrease it’s heating value. The Purification of biogas is a solution to increase the heating value. One of eco-friendly way to purify biogas eco-friendly is by using microalgae Spirulina sp which has the CO₂ Biofixation ability. This research intends to Determine the most effective flow rate of tubular type photobioreactor by using microalgae spirulina in absorbing CO₂ and determine the optimum concentration of CO₂ that can be absorbed by the microalgae Spirulina sp. This research is using flow rate of gas mixture (30% CO₂ gas composition V: air 70% V) 0.2 L / sec, 0.5 L / sec, 1 L / sec, and 1.5 L / sec. And using composition of the feed gas (flow rate of 0.5 L / min) was 25% V CO₂, 75% air V; CO₂ 30% V; air 70% V; V 35% CO₂, 65% air V; CO₂ 40 % V, 60% air. The results obtained that the optimum flow rate for CO₂ absroption is the flowrate  0.5 L / min with a feed gas composition CO₂: air (30:70). Highest CO₂ absorption amounted to 0.47%, and it doesnt reach the desired target of purification. So it needs to re-design the research’s tools to increase the amount of CO₂ absorbed.