Performance Evaluation of Japanese Eco-toilets for Realizing Nutrient Matter Cycle

为实现以粪便堆肥为基础的营养物质循环，作者以日本生态厕所的家庭使用为研究对象，从卫生工程学和（火用）分析的角度进行了一系列的使用试验。结果发现，在没有高热量材料的情况下，不能实现预期的防止病原生物热死亡的高温发酵。在整个使用实验期间未产生不舒适的气味。环境水越清澈，黑水的火用越大，即净化工作越困难。因此，清水应与粪便分开。分类式堆肥池可避免使用冲洗水和生产尿素肥料，如果从堆肥厕所的尿素被用作无机肥料，因此，用于堆肥厕所的操作设备的初级有效能输入小于用于冲洗水和生产尿素肥料的初级有效能输入。

For realizing nutrient matter cycle based on night soil compost, the author focused on the household use of Japanese eco-toilets and made a series of their use experiment in terms of sanitary engineering and exergy analyes. As results, followings were found. High temperature fermentation to be expected against thermal death of pathogenic organisms was not realized without highly calorific material. Uncomfortable odor was not generated during whole use experiments. The clearer the environmental water is, the larger exergy of black water is, namely, the harder the purification work is. Therefore, clear water should be separated from excrement. A sorting-type composting tank can avoid use of flushing water and production of ureafertilizer, if urea from a composting toilet is utilized as inorganic fertilizer.Thereby, primary exergy input for operating equipments of a composting toilet becomes smaller than primary exergy input for flushing water and production of urea fertilizer.