The processing of natural rubber is one of the potential industries that is growing rapidly in Indonesia. In rubber processing stage, number of pollution problems occur, such as unpleasant odor from the chemical and biological process. Ammonia is one of crucial pollutants resulted. According to Decree of Ministry of Environment No. 50/1996, ammonia levels in air must be less than 2 ppm. Biofiltration becomes one of removal techniques that continues to be developed. In this work, an engineering design for reducing ammonia levels from natural rubber processed materials was prepared for capacity of 10 L. The prototype of the system was prepared for industrial applications. Rubber Processed Materials (RPM) sample was stored in a storage and then connected to the line system to the biofilter. The prototype of multibed biofilter was created and successfully tested to reach the target of ammonia removal efficiency of 98%. The filter media used was activated carbon and compost. The nitrifying bacteria was added with a dose of 2% filter volume. Gas from the rubber storage room flowed at the rate of 12 L/min and the optimal ratio of rubber material to volume of storage room is 0.52-1.81.

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