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Articles by N.A.A. Rahman
Total Records ( 2 ) for N.A.A. Rahman
  M.Z.M. Yusoff , M.A. Hassan , S. Abd-Aziz and N.A.A. Rahman
  Feasibility study of biohydrogen production from Palm Oil Mill Effluent (POME) using POME sludge as a mixed culture of natural inoculum was conducted. The experiment was done using a 150 mL serum bottle and 50 L Continuous Stirred Tank Reactor (CSTR) in batch and continuous modes, respectively. The biogas produced from both fermentations was free from methane due to heat treatment of the sludge prior to inoculation. The results obtained showed that the biohydrogen content in 150 mL serum bottle was higher (70%) than that of 50 L CSTR (25%). The biohydrogen rates for serum bottle and 50 L bioreactor were 74 and 33 NmL/h/L, respectively. Butyrate, propionate and acetate were the main soluble metabolites produced during the fermentation and reduced the pH of broth.
  Z. Shahrim , V. Sabaratnam , N.A.A. Rahman , S. Abd-Aziz , M.A. Hassan and M.I.A. Karim
  Trichoderma sp. KUPM0001 showed good growth during solid substrate fermentation (SSF) of sago pith residue known as hampas, supplemented with 10% (v/w) of mineral salts solution containing 0.5% (w/v) (83.3 mM) urea as nitrogen source and an initial moisture content of 80% (v/w). Mycelium suspension of 10% (v/w) density was used as initial inoculum and SSF was carried out at 25±2°C in static condition over a period of 120 h. The parameters optimized included the initial moisture content of the substrate, mineral salts solution, urea concentration, inoculum density, incubation temperature and incubation time. Without optimized condition, the maximum reducing sugar obtained was 24 mg mL-1 compared to 46 mg mL-1 substrate during optimized SSF after 96 h incubation. The optimum parameters obtained were 80% (v/w) of initial moisture; 10% (v/w) of inoculums size; 1.0% of urea in 20% (w/v) of mineral solution and incubated at 30±2°C. The enzyme activities using optimized condition gave maximum α-amylase, glucoamylase, carboxymethyl cellulase, filter paperase and β-glucosidase of 3.19, 2.22, 1.66, 1.11 and 1.48 U mL-1, respectively.
 
 
 
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