A client with a commercial cattle farm of at least 10,000 cows planned to build an organic granulation plant to process cow dung into organic fertilizer granules for sale. Based on the annual output of cow dung and factory layout, an 8t/h rotary drum granulation line was designed, including screening machines, horizontal mixers, chain crushers and other equipment. The rotary drum granulator was selected for its strong working capacity and suitability for large-scale production.