Japan Diaper Firms Boost Recycling as Waste Surges in Aging Society

Japan's Innovative Approach to Recycling Used Adult Diapers

Japan is facing a growing challenge with the increasing volume of used adult diapers, prompting manufacturers to explore innovative recycling methods. These efforts aim to convert waste into valuable resources, reducing reliance on incineration and lowering carbon emissions.

The Environment Ministry introduced guidelines in 2020 that encourage the recycling of used diapers, urging private companies and local governments to develop sustainable solutions. This initiative comes as the demand for adult diapers continues to rise, despite a decline in the production of children’s diapers due to Japan's shrinking birthrate.

According to the ministry, the share of used diapers in general waste is expected to increase from around 5 percent in fiscal 2020 to about 7 percent by fiscal 2030. This trend highlights the need for effective waste management strategies.

Challenges with Incineration

Used diapers are typically incinerated along with other general waste. However, their high moisture content poses significant challenges. The presence of moisture reduces combustion efficiency, making the process less effective and more resource-intensive.

Diapers are composed of various materials, including high-quality pulp, resins, and absorbent agents. The pulp can be extracted and reused through a process known as horizontal recycling. This method transforms used products into raw materials, which can then be used to recreate the original item.

Kao Corp. and Kamikatsu Town

Kao Corp., a leading Japanese company, has taken a proactive approach by signing an agreement with the town of Kamikatsu in Tokushima Prefecture. The collaboration aims to begin a demonstration experiment by the end of the year, focusing on producing an energy source from collected diapers. This alternative to fossil fuels could significantly reduce environmental impact.

Kao has been involved in similar trials with Saijo city in Ehime Prefecture since 2021. A company official noted that one of the key advantages of this scheme is the ability to dispose of diapers on-site, reducing their volume to one-twentieth of the original size. However, the official also acknowledged ongoing challenges related to costs.

Unicharm Corp. and Daio Paper Corp.

Unicharm Corp. has partnered with two municipalities in Kagoshima Prefecture to sell diapers made from sterilized pulp recovered from used products. This initiative is part of their broader horizontal recycling efforts, demonstrating how waste can be transformed into useful goods.

Daio Paper Corp. has also joined diaper recycling projects with three local governments in Fukuoka Prefecture. These collaborations highlight the growing interest among Japanese companies in developing sustainable waste management practices.

Future Prospects

As Japan continues to address the issue of used adult diapers, the focus remains on finding efficient and cost-effective recycling solutions. The involvement of major manufacturers and local governments signals a commitment to innovation and environmental responsibility.

With the right strategies and continued investment, the recycling of used diapers could become a cornerstone of Japan's waste management system. This shift not only helps reduce environmental impact but also paves the way for a more sustainable future.