Fruit and vegetable wastes present low total solids and high volatile solids and are easily degraded in anaerobic digesters. The rapid hydrolysis of these feedstocks may lead to acidification of the digester and the consequent inhibition of methanogenesis. Many carbohydrate-rich feedstocks require either co-digestion with other feedstocks or addition of alkaline buffer to ensure stable performance (Wieger et al., 1978). A solution may be provided by two-stage reactors that use the first stage as a buffer against the high organic loading rate, which offers some protection to the methanogens. Separation of the acidification process from methanogenesis by the use of sequencing batch reactors has shown to give high stability, a significant increase in biogas production and an improvement in the effluent quality when used with fruit and vegetable waste (Bouallagui et al, 2004).