The liquid effluent generated during the processing of natural rubber latex into Ribbed Smoked Sheets (RSS) is organic in nature. Attempts were made to digest the effluent anaerobically leading to the production of methane gas. A field study was initiated to evaluate the performance of the anaerobic digester with biologically inert materials (which would increase biogas production) termed as anaerobic immobilized growth digester, at RSS processing centre. Two anaerobic immobolized growth digesters having 15 cu. m capacity and an aerobic pond which were serially connected in a RSS group processing centre were used for the study. The effluent was fed daily at the rate of 1500 L keeping a Hydraulic Retention Time (HRT) of 20 days. The assessment of gas indicated considerable levels of treatment. The BOD and COD level reached near to the level prescribed for irrigation due to the anaerobic digestion and aerobic treatment. The per cent removal efficiency was also high in both the treatment systems at alower HRT of 20 days. Monthly average of 17.36 cu.m gas was generated from the digesters together. Methane content in the biogas was in the range of 58 to 66;while that of hydrogen sulphide was 5 to 10;. A temperature build up of 50 oC was attained at the 4th hour of burning of biogas and average of 39 oC was attained for 10 hours by burning the same. At the same time at the 4th hour of burning of firewood 55 oC was attained and the average temperature was 45 oC.