This preliminary study focuses on the ammonia recovery from the organic sludge composting with a ratio of 3:7 shrimp sludge to cow dung. Clean nitrogen produced from the composting process will be used for the cultivation of high-value microalgae. One ton of compost mixture was prepared at a mix ratio of 4:15:1 sludge rice-husk compost-seed in a rotary drum reactor. Time course of CO2 from exhaust gas, compost moisture content and temperature were monitored daily. Daily percent CO2 from exhaust gas was controlled to be lower than 6% by adjusting the aeration at the range of 150 L/min to 30 L/min. The moisture content was observed to be within the range of 47 % to 62 % and the highest temperature achieved was 56.68 °C throughout 16 days of composting experiment. Exhaust gas from the reactor was channeled into a water tank containing seawater for ammonia trapping. The ammonium nitrogen, NH4+-N content in seawater was measured using indophenol blue method with a finding of 0.42 mg- NH4+-N /L at Day 16 of the composting. An additional experiment was carried out by mixing 2.6 mmol, (801 g) of calcium hydroxide, Ca (OH)2 with 50 kg of day 16 compost at 30 L/min of aeration to maximize ammonia recovery. A significant increment of ammonia concentration to 0.67 mg- NH4+-N/L was measured in seawater samples after 24 h. Our preliminary results showed relatively low NH4+-N content in seawater, thus few recommendations were suggested to optimize the composting process and maximize the ammonia recovery.