近年来,对大量生产、生活废物进行再得用,是许多人关注的焦点,日本人在这方面颇有建树。利用“下水”产热能下水道在城市的地下形成了巨大的网络。现在东京都内的下水管道长约1.5公里,聚集的下水量每天可高达500万立方米。下水道中的水在一年中温度变化水大,约为10℃-25℃,与气温相比,它有夏低冬高的特征。经测算,如果能够利用“下水”5℃的温差,那么一年开发利用的热量就可达到9.1×10Gcal这个数量相 In recent years, the reuse of mass production and domestic waste has been the focus of attention for many people, and the Japanese are quite successful in this area. The use of “water” heat production sewers formed a huge network underground in the city. The sewer line in Tokyo is about 1.5 kilometers long, and the amount of water collected can reach as high as 5 million cubic meters per day. The water in the sewer changes in temperature during the year and is about 10°C-25°C. Compared with the temperature, it has the characteristics of low summer and high winter. It has been estimated that if the temperature difference between 5°C and 5°C can be utilized, then the amount of heat developed and utilized in a year can reach 9.1×10 Gcal.