Abstract
We have a lot of organic waste, especially in urban area. Urban cities should manage to treat its organic waste within the cities as much as possible. In order to run composting system of organic waste successfully, we need more green open space where recycled compost can return to the soil. Composting also improves the urban soil, and the improved soil can grow rich and healthy green. This will also be effective in controlling heat-island phenomenon and floods in urban areas. We studied whether we can use recycled compost, in urban green open space and we tried to classify the space in terms of the quality of the compost to be used in the areas as well as its feasibility. Then, we showed the calculation for Green Open Space for Return, which is required size of the green area for a city to return the organic waste generated in the city. In addition, we made a calculation taking a example of Itabashi-ku, Tokyo.
