Enhancement of Biodiesel Production from Marine Alga, Scenedesmus sp. through In Situ Transesterification Process Associated with Acidic Catalyst

Table 4

Analysis of the in situ transesterification factors for the yield of crude biodiesel from Scenedesmus sp. using the orthogonal array design (% w/w, based on lipid weight).

	𝐴	𝐵	𝐶	𝐷
𝐾1	102.13±3.61	102.03±4.46	97.26±7.04	91.46±4.71
𝐾2	124.24±2.00	124.14±2.77	124.50±1.33	137.97±1.13
𝐾3	127.42±2.61	127.63±0.99	132.04±0.16	124.38±2.38
𝑘1	34.04±1.20	34.01±1.49	32.42±2.35	30.49±1.57
𝑘2	41.41±  0.67	41.38±0.92	41.50±0.44	45.99±0.38
𝑘3	42.47±0.87	42.54±0.33	44.01±0.05	41.46±0.79
𝑅	8.43±0.24	8.54±1.16	11.59±2.40	15.50±1.60
Optimal level	3	3	3	2

𝐾^𝐴_𝑖= ∑ biodiesel yield at 𝐴_𝑖.   
𝑘^𝐴_𝑖=𝐾^𝐴_𝑖/3.  
𝑅^𝐴_𝑖=max{𝑘^𝐴_𝑖}−min{𝑘^𝐴_𝑖}.