一关于农业用地等施用污泥的现状和研究课题 (一)下水污泥的处理现状到1981年止,日本全国约有500个下水道末端处理厂在处理污水,年处理下水量约为65亿M~3,处理出的污泥量为2,397千米~3(表1,略)。从对污泥的处理方式来看,填平陆地和海面的为78％,有效利用的为15％。目前, Status and research topics on the application of sludge to agricultural land, etc. (I) Status of Sewage Sludge Treatment Until 1981, about 500 sewer terminal treatment plants in Japan were treating sewage with an annual treatment volume of about 6.5 billion M ~ 3, the amount of sludge is 2,397 km ~ 3 (Table 1, omitted). From the treatment of sludge point of view, fill the land and sea 78%, effective use of 15%. Currently,