Current Status of Incinerator Ash Reef Utilization Technologies in the 2020s
In the 2020s, fishing reef technology using incinerated ash is further evolving and playing an important role in both environmental conservation and waste disposal. In particular, this technology has been introduced not only in Japan but also in other Asian countries such as South Korea, Taiwan, and even Indonesia, contributing to the restoration of local marine ecosystems.
As specific examples of companies, Japanese companies Mitsui Engineering & Shipbuilding and Hitachi Zosen continue to lead this technology, and further innovations are underway in the 2020s. The latest technology improves the durability of artificial reefs using fly ash produced from incinerator ash, and the use of more environmentally friendly materials further reduces the long-term environmental impact after installation.
For example, artificial reefs installed in Tokyo Bay and the Seto Inland Sea have shown recovery of the marine ecosystem, with fish populations increasing by more than 30%. Similar results have also been reported in the coastal areas of Jeju Island in South Korea and Taiwan, contributing significantly to the recovery of fishery resources.
In addition, a new material, concrete mixed with carbon fiber in addition to incinerator ash, has been developed to provide fishing reefs with even greater strength and environmental adaptability. This technology was jointly developed by Japanese companies such as Shimizu Corporation and Obayashi Corporation, and is expected to be widely used throughout Asia in the future.
Another development in the use of incinerated ash in the 2020s is its linkage with projects aimed at marine pollution prevention and waste reduction, in addition to the installation of fishing reefs. For example, in Jakarta Bay, Indonesia, an attempt has begun to solve the marine debris problem by reusing some of the urban waste as incinerator ash and installing artificial fishing reefs.
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