開発途上国における生ごみコンポスト化技術「高倉式コンポスト」が果たした役割とその効果についての調査 ――インドネシア共和国スラバヤ市の事例: A Case of Surabaya in the Republic of Indonesia

In spite of being a huge metropolis with a population of more than three million, Surabaya in the Republic of Indonesia has drastically reduced its landfill disposal over a period of five years, transforming itself into a green city. The driving force behind this achievement is the Takakura Composting Method, which was acquired in Surabaya in cooperation with Kitakyushu. This paper investigates the role and effects of this technology through a field study conducted in Surabaya. The Takakura Composting Method was set up as a technology that inspires satisfaction amongst the various stakeholders because of its effective administrative policies and the way in which it inspires inhabitants to become active about the issue of garbage composting. Although the contribution ratio for reduction of landfill disposal against garbage recycling for the program was restrictive—at approximately 19.9 %—it has promoted the collection of recyclable waste within the community and spilled over into development of a compost center by the administration. Since 2011, the city has been able to reduce its landfill disposal rate by more than 60 % per capita GRP. Moreover, with the aim or reaching a 30 % green goal, composting of organic waste is being vigorously promoted, there have been reports that as the program continues, the amount of waste can be stabilized at an all-time low level in the foreseeable future.