One of organic compound which inhibits anaerobic waste water treatment is ammonia. Ammonia concentration can decrease with coconut shell as media in anaerobic wastewater treatment. This research using dairy milk simulated waste water. This research is studying ammonia concentration, COD, alkalinity, VFA, ammonia removal and COD removal after incubation 7 days. This research use square shaped reactor made of HDPE. The total Volume of the reactor is 12 L. The reactor mainly consists an influents port, effluent port and manometer. This research using anaerobic batch system. The reactor contained coconut shell activated carbon and dairy milk simulated wastewater after 7 days, the reactor is capable of ammonia and COD allowance for a maximum of 60.55% and 44.54% is the reactor with the addition of coconut shell activated carbon with an ammonia concentration of 1000 mg/L In this research also analyses the Scanning Electron Microscopy of coconut shell activated carbon after contact with dairy milk simulated wastewater.