Palm oil mill e uent (POME) sludge, sludge compost from Malaysia and CREST compost from Philippines were collected for the study. The capability of these micro ora to produce hydrogen was examined with 500 ml artiÿcial wastewater containing 1% glucose, 0.2% yeast extract and 0.018% magnesium chloride hexahydrate under anaerobic fermentation in a batch culture. The micro ora in POME sludge, sludge compost and CREST compost were found to produce signiÿcant amounts of hydrogen. The maximum production yield of hydrogen per decomposed glucose was 2:1 mol=mol-glucose at a conversion rate of 0:137 L=(L-med h) at 50 • C obtained by sludge compost. All fermentations were carried out without pH control. It was also found that the addition of nitrogen source in the medium caused a change in hydrogen produced. There was no methane gas in the evolved gas. ?