Abstract
The Indonesian government is trying to equalize development including the energy sector. The government launched the use of alternative energy starting in 2008 with a blueprint for searching and utilizing new renewable energy sources in Indonesia through biofuels, one of the alternative energy developed is bioethanol. The research objective is the optimization of the SHF method bioethanol production process from palm fruit fiber waste.
 The experimental design uses central composite design with variable H2SO4 concentration and fermentation time. The first stage in the study was by saccharifying the palm oil fiber waste by the hydrolysis method using H2SO4 (concentrations of 1 M, 2 M, and 3 M). Then the next stage is fermentation process (fermentation time is 1 day, 2 days, 3 days, 4 days and 5 days). Sugar content analysis was carried out in the fermen solution and analysis of bioethanol levels in each running experiment. Then the optimization is done with the response surface method (RSM).
 Based on the research, the optimum condition of the bioethanol production process is H2SO4 concentration of 2.76 M with a fermentation time of 4.64 days which will produce bioethanol levels of 28.6027 g/L.
Highlights
The Indonesian government is trying to equalize development including the energy sector
The government launched the use of alternative energy starting in
of the alternative energy developed is bioethanol. The research objective is the optimization of the separate hydrolysis and fermentation
Summary
Kebutuhan masyarakat akan energi semakin besar dan masih sangat tergantung pada sumber bahan bakar minyak yang berasal dari fosil. Oleh karena itu pemerintah mencanangkan penggunaan energi alternatif dengan Peraturan Menteri Energi dan Sumber Daya Mineral No 32 Tahun 2008 tentang Pentahapan Kewajiban Pemakaian Bahan Bakar Nabati (BBN), salah satu energy alternatif yang dikembangkan adalah bioetanol (Ardiansyah dkk, 2012). Dikembangkan bioetanol generasi kedua dengan bahan baku limbah padat agroindustri yang mengandung lignoselulosa (Wahono dkk 2014). Limbah padat sawit terdiri dari batang sawit, pelepah sawit, tandan kosong, serat buah sawit dan cangkang sawit, merupakan bahan baku dengan lignoselulosa yang tinggi. Beberapa penelitian mengenai bioethanol fokus pada sumber bahan baku, sedangkan optimasi dari kondisi proses sakarifikasi maupun fermentasi belum dilakukan. Oleh karena itu pada penelitian ini dilakukan optimasi proses produksi bioetanol metode SHF dari limbah serat buah sawit
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