Organic fertilizer composting machines are crucial for waste – to – fertilizer conversion, yet their odor troubles the environment and human health. Odors stem from incomplete anaerobic reactions of organic matter, with components like ammonia and hydrogen sulfide. There are three main control technologies: biological, chemical, and physical adsorption. When choosing, consider factors like machine scale and cost. Act now, pick the right tech, and control parameters to solve odor issues and boost the green growth of the organic fertilizer industry.