Managing organic waste is a big challenge, and composting is a common solution. Green waste works well with composting, but mixed waste can cause issues with compost quality. Mechanical-biological treatment is used in many countries to separate organic waste from municipal solid waste. However, the quality of the compost produced can be a problem. A study compared compost from green waste with compost from mechanical-biological treatment. The green waste compost was more stable and less toxic. It also helped plants grow better compared to the other compost. The study showed that compost from mechanical-biological treatment had issues with maturity and quality.