Japan Water Circulation Mobile Toilet
Currently, Japan does not have a complete case that fully meets the definition of a 'water circulation mobile toilet,' but there are relevant technological practices that can provide references.
In terms of fixed ecological water circulation toilets, the ecological toilet 'TOILETOWA' created by Ishizaka Sangyo Co., Ltd. in Saitama Prefecture, Japan, is a typical example. It employs a composite fermentation method (EMBC) to treat excreta through a fermentation tank system. During this process, excreta undergo fermentation and decomposition, achieving the regeneration and recycling of water resources. The agricultural water produced by the fermentation tank is used to irrigate surrounding vegetable gardens and woodlands, forming a complete chain of wastewater recycling. This design not only solves the problem of excreta disposal but also realizes the effective reuse of water resources, providing new ideas for ecological and environmental protection. However, 'TOILETOWA' is a fixed toilet and does not have mobility.
In the field of mobile independent water supply facilities, the mobile handwashing device WOSH designed by the Japanese company WOTA is somewhat relevant. It does not require connection to a tap water system and has independent water supply capabilities. It is equipped with wheels at the bottom and can be flexibly moved to places such as streets and restaurants for use. This design meets the portability requirements of mobile facilities. Although it does not directly involve the entire toilet, it provides conceptual references for the research and development of mobile water circulation facilities, namely, how to achieve effective water supply and recycling without relying on fixed water sources.
Overall, Japan has certain technological accumulations and practical experiences in the fields of water circulation and toilet design. However, there is currently no complete case that perfectly combines water circulation and mobility in the form of a 'water circulation mobile toilet.' Nevertheless, the existing fixed ecological water circulation toilets and mobile independent water supply facilities provide technological directions and design inspirations for the future research and development of 'water circulation mobile toilets.' It is expected that further innovation and breakthroughs can be made on this basis to achieve a true water circulation mobile toilet.
