the anaerobic digestion of screening from a municipal wast water treatment plant was studied in a 90 L pilor-scal digester operated at 35 ํ C under semi-continuous condition . in the first 4 weeks a dry solid residence time of 28 days was applied but the installation from inhibition condition was observed. feeding was therefore suspended for 4 weeks to allow the digester from inhibition and then progressively increased up to a constant load of raw waste per week corresponding to an average residence time of about 35 day of dry solid. At this stage Biogas production stabilized between 513 and 618 NI/kgVS per week with methane contents around 61% v/v. the results of this work thereby supported the feasibility of (co-)digestion as a potential alternative treatmant of screening from municipal wastwater treatment plant