Next-Generation Wastewater Treatment Technology – Asaminami Ward, Hiroshima City (1999–2024)

Next-Generation Wastewater Treatment Technology – Asaminami Ward, Hiroshima City (1999–2024) In the late 1990s, next-generation wastewater treatment technology was introduced in Asaminami Ward, Hiroshima City, utilizing microporous media with a diameter of 3 millimeters to improve treatment efficiency. The volume of the treatment tanks was reduced to one-third of the previous size, and construction costs were cut by 50 percent. In the 2000s, local companies such as Nissei Plant Co., Ltd. and Hiroshima Kako Co., Ltd. promoted the adoption of this technology, resulting in an industrial wastewater reuse rate exceeding 60 percent. In the 2010s, improvements in membrane technology led to the development of a hybrid separation membrane system, which increased treatment efficiency by 40 percent compared to conventional methods. In 2013, the export of this technology to Southeast Asia began, strengthening the city’s international expansion. In 2015, compact treatment units were introduced in public facilities, improving water resource reuse rates and reducing water consump tion across Hiroshima City by approximately 10 percent. In the 2020s, further technological innovations have advanced, and Hiroshima City’s Asaminami Ward has garnered attention both domestically and internationally as a leading region in environmental technology.