This research was undertaken to evaluate the performance yield and biological efficiency of empty fruit bunch (EFB) and shredded palm pressed fibers (PPF) as an alternative substrate which is widely available for the cultivation of Pleurotus ostreatus. Currently rubber tree sawdust (RS) is used which is of limited supply. In this study, five different substrates were prepared either alone or in combinations in the ratio of 1:1 with rubber tree sawdust. These substrates were supplemented with fixed ratio of rice bran and limestone to increase the yield of Pleurotus ostreatus. Shredded palm pressed fiber (PPF) and rubber sawdust (RS) in the ratio of 1:1 took 52 days for the mycelium to fully colonize the substrate as compared to 49 days for rubber saw dust alone. The performance yield and biological efficiency observed for the substrates comprising of 50% PPF and 50% rubber tree sawdust and 50% EFB and 50% rubber tree sawdust(RS) are 2.325 kg with a biological efficiency of 232.5% and 1.380 kg with a biological efficiency of 138%, respectively. The results obtained show that both shredded palm pressed fiber (PPF) and empty fruit bunch (EFB) show great potential as substrate for the cultivation of Pleurotus ostreatus when incorporated with rubber tree sawdust (RS).

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In this paper, raw material of refined bleached and deodorised palm oil (RBDPO) was separated into olein and stearin by applying progressive freeze concentration (PFC) as an alternative method to replace the conventional fractionation process using coil crystallizer. Overall heat transfer coefficient (U) was analyzed from the process by varying different coolant temperature values since both of them are closely related each other. In this case, heat transfer efficiency depends strongly on crystal of stearin formed on the inner wall of cooled surface and is explained theoretically from that angle.  At optimum flowrate, operation time and initial iodine value (IV), the best results were observed at 28ºC of coolant temperature where high IV of olein and effective partition constant (K) obtained were 55.8 wijs and 0.27 respectively. Meanwhile, the highest U obtained at coolant temperature 28oC same as result for process efficiency at 392.9183 W/m².K and time at 55 min.

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