These substrates were obtained from the waste storage facility of one of the leading supermarket chain in Turkey. Initially, the wastes were shredded in order to enhance digestion. An inoculum from an industrial anaerobic waste-water treatment plant was also used in order to initiate biological activity in batch reactors. The substrates were stored at 4 C prior to experiments. The characteristics of the substrates and the inoculum are given in Table 1.