Pengaruh Pengendalian Ph Terhadap Pembentukan Etanol Dan Pergeseran Produk Asidogenesa Dari Fermentasi Limbah Cair Industri Minyak Sawit (the Influence of Ph Control on Ethanol and Switch of Acidogenic Products Formation From Palm Oil Mill Effluent)

摘要

Palm oil mill effluent has potention for substrate to ethanol formation. Utilization of anaerobic mixed culture bacteria to form ethanol has advantages i.e not requiring sterilization of the substrate and vice versa in Saccharomyces cerevisiae, but resulting side products. The aims of this research are to study effect of controlling pH on ethanol formation and acidogenic products. Design experiment consisted of anaerobic bacteria and yeast reactor with the pH control in the range of pH 6 - 6.5 and initial pH 6-6.5 for without pH control treatment. The results showed the highest Degree Acidification (DA), Total Volatile Fatty Acid (TVFA) and ethanol are 0.32; 808.03 mg/L and 24.03 mg/L for bacteria reactor with pH control; 0.23; 522.43 mg/L and 23.12 mg/L for bacteria reactor without pH control; 0.25; 775.78 mg/L and 34.11 mg/L for yeast reactor with pH control and 0.32; 866.71 mg/L and 29.17 mg/L for yeast reactor without pH control. Controlling pH increasing acetyl-CoA product formation from 4.35% to 7.34% for bacteria reactor and from 17.92% to 18.78% for yeast one and not affect to rising ethanol formation.